1 | /*
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2 | * XMLTransformer.java
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3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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4 | *
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5 | * This program is free software; you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation; either version 2 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 | */
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19 | package org.greenstone.gsdl3.util;
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20 |
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21 | import java.io.BufferedReader;
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22 | import java.io.File;
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23 | import java.io.FileInputStream;
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24 | import java.io.FileNotFoundException;
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25 | import java.io.FileWriter;
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26 | import java.io.InputStreamReader;
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27 | import java.io.IOException;
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28 | import java.io.StringReader;
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29 | import java.io.StringWriter;
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30 | import java.io.UnsupportedEncodingException;
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31 | import java.net.MalformedURLException;
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32 | import java.net.URISyntaxException;
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33 | import java.net.URI;
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34 | import java.net.URL;
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35 | import java.util.HashMap;
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36 | import java.util.Iterator;
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37 | import java.util.Map;
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38 | import java.util.Properties;
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39 | import java.util.Set;
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40 |
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41 | import javax.xml.parsers.DocumentBuilderFactory;
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42 | import javax.xml.transform.ErrorListener;
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43 | import javax.xml.transform.OutputKeys;
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44 | import javax.xml.transform.Source;
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45 | import javax.xml.transform.Transformer;
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46 | import javax.xml.transform.TransformerConfigurationException;
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47 | import javax.xml.transform.TransformerException;
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48 | import javax.xml.transform.TransformerFactory;
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49 | import javax.xml.transform.URIResolver;
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50 | import javax.xml.transform.dom.DOMResult;
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51 | import javax.xml.transform.dom.DOMSource;
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52 | import javax.xml.transform.stream.StreamResult;
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53 | import javax.xml.transform.stream.StreamSource;
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54 |
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55 | import org.apache.log4j.Logger;
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56 | import org.greenstone.util.GlobalProperties;
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57 | import org.w3c.dom.Document;
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58 | import org.w3c.dom.Element;
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59 | import org.w3c.dom.Node;
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60 |
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61 | import org.xml.sax.XMLReader;
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62 | import org.xml.sax.EntityResolver;
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63 | import org.xml.sax.InputSource;
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64 | import org.xml.sax.SAXException;
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65 | import javax.xml.transform.sax.SAXSource;
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66 | import org.xml.sax.helpers.XMLReaderFactory;
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67 | /**
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68 | * XMLTransformer - utility class for greenstone
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69 | *
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70 | * transforms xml using xslt
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71 | *
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72 | */
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73 | public class XMLTransformer
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74 | {
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75 | private static int debugFileCount = 0; // for unique filenames when debugging XML transformations with physical files
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76 |
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77 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.util.XMLTransformer.class.getName());
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78 |
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79 | /** The transformer factory we're using */
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80 | TransformerFactory t_factory = null;
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81 |
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82 | /**
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83 | * The no-arguments constructor.
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84 | *
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85 | * Any exceptions thrown are caught internally
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86 | *
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87 | * @see javax.xml.transform.TransformerFactory
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88 | */
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89 | public XMLTransformer()
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90 | {
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91 | // http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/api/index.html?javax/xml/transform/TransformerFactory.html states that
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92 | // TransformerFactory.newInstance() looks in jar files for a Factory specified in META-INF/services/javax.xml.transform.TransformerFactory,
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93 | // else it will use the "platform default"
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94 | // In this case: xalan.jar's META-INF/services/javax.xml.transform.TransformerFactory contains org.apache.xalan.processor.TransformerFactoryImpl
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95 | // as required.
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96 |
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97 | // This means we no longer have to do a System.setProperty("javax.xml.transform.TransformerFactory", "org.apache.xalan.processor.TransformerFactoryImpl");
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98 | // followed by a this.t_factory = org.apache.xalan.processor.TransformerFactoryImpl.newInstance();
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99 | // The System.setProperty step to force the TransformerFactory implementation that gets used, conflicts with
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100 | // Fedora (visiting the Greenstone server pages breaks the Greenstone-tomcat hosted Fedora pages) as Fedora
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101 | // does not include the xalan.jar and therefore can't then find the xalan TransformerFactory explicitly set.
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102 |
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103 | // Gone back to forcing use of xalan transformer, since other jars like crimson.jar, which may be on some
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104 | // classpaths, could be be chosen as the TransformerFactory implementation over xalan. This is what used to
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105 | // give problems before. Instead, have placed copies of the jars that Fedora needs (xalan.jar and serializer.jar
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106 | // and the related xsltc.jar which it may need) into packages/tomcat/lib so that it's on the server's classpath
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107 | // and will be found by Fedora.
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108 |
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109 | // make sure we are using the xalan transformer
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110 | System.setProperty("javax.xml.transform.TransformerFactory", "org.apache.xalan.processor.TransformerFactoryImpl");
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111 | try
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112 | {
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113 | this.t_factory = org.apache.xalan.processor.TransformerFactoryImpl.newInstance();
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114 | //this.t_factory = TransformerFactory.newInstance();
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115 | this.t_factory.setErrorListener(new TransformErrorListener()); // handle errors in the xml Source used to instantiate transformers
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116 | }
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117 | catch (Exception e)
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118 | {
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119 | logger.error("exception creating t_factory " + e.getMessage());
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120 | }
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121 | }
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122 |
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123 | /**
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124 | * Transform an XML document using a XSLT stylesheet
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125 | *
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126 | * @param stylesheet
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127 | * a filename for an XSLT stylesheet
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128 | * @param xml_in
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129 | * the XML to be transformed
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130 | * @return the transformed XML
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131 | */
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132 | public String transform(String stylesheet, String xml_in)
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133 | {
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134 |
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135 | try
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136 | {
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137 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
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138 | transformerErrorListener.setStylesheet(stylesheet);
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139 | // Use the TransformerFactory to process the stylesheet Source and generate a Transformer.
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140 | Transformer transformer = this.t_factory.newTransformer(new StreamSource(stylesheet));
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141 |
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142 | // Use the Transformer to transform an XML Source and send the output to a Result object.
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143 | StringWriter output = new StringWriter();
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144 | StreamSource streamSource = new StreamSource(new StringReader(xml_in));
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145 | transformer.setErrorListener(new TransformErrorListener(stylesheet, streamSource));
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146 | transformer.transform(streamSource, new StreamResult(output));
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147 | return output.toString();
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148 | }
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149 | catch (TransformerConfigurationException e)
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150 | {
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151 | logger.error("couldn't create transformer object: " + e.getMessageAndLocation());
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152 | logger.error(e.getLocationAsString());
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153 | return "";
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154 | }
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155 | catch (TransformerException e)
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156 | {
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157 | logger.error("couldn't transform the source: " + e.getMessageAndLocation());
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158 | return "";
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159 | }
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160 | }
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161 |
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162 | public String transformToString(Document stylesheet, Document source)
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163 | {
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164 | return transformToString(stylesheet, source, null);
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165 | }
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166 |
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167 | public String transformToString(Document stylesheet, Document source, HashMap parameters)
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168 | {
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169 |
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170 | try
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171 | {
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172 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
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173 | transformerErrorListener.setStylesheet(stylesheet);
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174 | // Use the TransformerFactory to process the stylesheet Source and generate a Transformer.
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175 | Transformer transformer = this.t_factory.newTransformer(new DOMSource(stylesheet));
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176 | if (parameters != null)
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177 | {
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178 | Set params = parameters.entrySet();
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179 | Iterator i = params.iterator();
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180 | while (i.hasNext())
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181 | {
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182 | Map.Entry m = (Map.Entry) i.next();
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183 | transformer.setParameter((String) m.getKey(), m.getValue());
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184 | }
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185 | }
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186 | //transformer.setParameter("page_lang", source.getDocumentElement().getAttribute(GSXML.LANG_ATT));
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187 |
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188 | // Use the Transformer to transform an XML Source and send the output to a Result object.
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189 | StringWriter output = new StringWriter();
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190 | DOMSource domSource = new DOMSource(source);
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191 |
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192 | transformer.setErrorListener(new TransformErrorListener(stylesheet, domSource));
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193 | transformer.transform(domSource, new StreamResult(output));
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194 | return output.toString();
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195 | }
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196 | catch (TransformerConfigurationException e)
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197 | {
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198 | logger.error("couldn't create transformer object: " + e.getMessageAndLocation());
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199 | logger.error(e.getLocationAsString());
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200 | return "";
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201 | }
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202 | catch (TransformerException e)
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203 | {
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204 | logger.error("couldn't transform the source: " + e.getMessageAndLocation());
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205 | return "";
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206 | }
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207 | }
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208 |
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209 | /**
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210 | * Transform an XML document using a XSLT stylesheet, but using a DOMResult
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211 | * whose node should be set to the Document donated by resultNode
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212 | */
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213 | public Node transform_withResultNode(Document stylesheet, Document source, Document resultNode)
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214 | {
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215 | return transform(stylesheet, source, null, null, resultNode);
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216 | }
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217 |
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218 | public Node transform(Document stylesheet, Document source)
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219 | {
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220 | return transform(stylesheet, source, null, null, null);
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221 | }
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222 |
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223 | public Node transform(Document stylesheet, Document source, HashMap<String, Object> parameters)
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224 | {
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225 | return transform(stylesheet, source, parameters, null, null);
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226 | }
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227 |
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228 | public Node transform(Document stylesheet, Document source, HashMap<String, Object> parameters, Document docDocType)
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229 | {
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230 | return transform(stylesheet, source, parameters, docDocType, null);
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231 | }
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232 |
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233 | // This method will now set the docType in the new document created and returned, if any are specified in the
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234 | // (merged) stylesheet being applied. The docDocType parameter is therefore no longer necessary nor used by default.
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235 | protected Node transform(Document stylesheet, Document source, HashMap<String, Object> parameters, Document docDocType, Document resultNode)
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236 | {
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237 |
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238 | try
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239 | {
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240 | // Use the TransformerFactory to process the stylesheet Source and generate a Transformer.
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241 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
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242 | transformerErrorListener.setStylesheet(stylesheet);
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243 | DOMSource xsl_source = new DOMSource(stylesheet);
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244 | if (xsl_source == null) {
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245 | logger.error("couldn't load stylesheet into domsource");
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246 | return transformError("XMLTransformer.transform(Doc, Doc, HashMap, Doc) couldn't load stylesheet into DOMSource", null);
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247 | }
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248 | Transformer transformer = this.t_factory.newTransformer(xsl_source);
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249 | //logger.info("XMLTransformer transformer is " + transformer); //done in ErrorListener
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250 | if (transformer == null) { // the above is never supposed to return null :-(
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251 | logger.error("couldn't create transformer");
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252 | return transformError("XMLTransformer.transform(Doc, Doc, HashMap, Doc) couldn't load stylesheet", null);
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253 | }
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254 | if (parameters != null)
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255 | {
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256 | Set params = parameters.entrySet();
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257 | Iterator i = params.iterator();
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258 | while (i.hasNext())
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259 | {
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260 | Map.Entry m = (Map.Entry) i.next();
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261 | transformer.setParameter((String) m.getKey(), m.getValue());
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262 | }
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263 | }
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264 |
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265 | // When we transform the DOMResult, we need to make sure the result of
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266 | // the transformation has a DocType. For that to happen, we need to create
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267 | // the DOMResult using a Document with a predefined docType.
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268 |
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269 | // When the DOCType is not explicitly specified (default case), the docDocType variable is null
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270 | // In such a case, the transformer will work out the docType and output method and the rest
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271 | // from the stylesheet. Better to let the transformer work this out than GS manually aggregating
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272 | // all xsls being applied and the GS code deciding on which output method and doctype to use.
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273 |
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274 | //DOMResult result = docDocType == null ? new DOMResult() : new DOMResult(docDocType);
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275 | DOMResult result = null;
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276 |
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277 | Properties props = transformer.getOutputProperties();
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278 | if(docDocType == null) { // default case
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279 |
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280 | String outputMethod = props.getProperty(OutputKeys.METHOD);
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281 | if(outputMethod.equals("html")) {
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282 | String doctype_public = props.getProperty(OutputKeys.DOCTYPE_PUBLIC);
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283 | String doctype_system = props.getProperty(OutputKeys.DOCTYPE_SYSTEM);
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284 |
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285 | if(doctype_public == null) {
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286 | //doctype_public = ""; // or default to PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"?
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287 | doctype_public = "-//W3C//DTD HTML 4.01 Transitional//EN";
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288 | }
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289 | if(doctype_system == null) {
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290 | //doctype_system = ""; // or default to "http://www.w3.org/TR/html4/loose.dtd"?
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291 | doctype_system = "http://www.w3.org/TR/html4/loose.dtd";
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292 | }
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293 |
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294 | Document docDocTypeFromTransformer = XMLConverter.newDOM(outputMethod, doctype_public, doctype_system);
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295 | result = new DOMResult(docDocTypeFromTransformer);
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296 | }
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297 | // if output method=xml, the <?xml ?> processing method goes missing hereafter, although it
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298 | // still exists in OutputKeys' VERSION, ENCODING and OMIT_XML_DECLARATION props at this point
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299 |
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300 | } else { // if document with doctype was already specified (no longer the default case)
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301 | result = new DOMResult(docDocType);
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302 | }
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303 | // At this point if we haven't initialised result yet, set it to an empty DOMResult
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304 | if(result == null) {
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305 | result = new DOMResult();
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306 | }
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307 |
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308 |
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309 | if (resultNode != null)
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310 | {
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311 | result.setNode(resultNode);
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312 | }
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313 | DOMSource domSource = new DOMSource(source);
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314 | transformer.setErrorListener(new TransformErrorListener(stylesheet, domSource));
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315 | transformer.transform(domSource, result);
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316 | return result.getNode(); // pass the entire document
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317 | }
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318 | catch (TransformerConfigurationException e)
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319 | {
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320 | return transformError("XMLTransformer.transform(Doc, Doc, HashMap, Doc)" + "\ncouldn't create transformer object", e);
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321 | }
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322 | catch (TransformerException e)
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323 | {
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324 | return transformError("XMLTransformer.transform(Doc, Doc, HashMap, Doc)" + "\ncouldn't transform the source", e);
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325 | }
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326 | }
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327 |
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328 | /**
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329 | When transforming an XML with an XSLT from the command-line, there's two problems if calling
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330 | XMLTransformer.transform(File xslt, File xml):
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331 |
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332 | 1. Need to run the transformation process from the location of the stylesheet, else it can't find
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333 | the stylesheet in order to load it. This is resolved by setting the SystemID for the stylesheet.
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334 |
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335 | 2. The XSLT stylesheet has <xsl:import> statements importing further XSLTs which are furthermore
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336 | specified by relative paths, requiring that the XSLT (and perhaps also XML) input file is located
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337 | in the folder from which the relative paths of the import statements are specified. This is resolved
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338 | by working out the absolute path of each imported XSLT file and setting their SystemIDs too.
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339 |
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340 | Without solving these problems, things will only work if we 1. run the transformation from the
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341 | web/interfaces/default/transform folder and 2. need to have the input XSLT file (and XML?)
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342 | placed in the web/interfacces/default/transform folder too
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343 |
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344 | Both parts of the solution are described in:
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345 | http://stackoverflow.com/questions/3699860/resolving-relative-paths-when-loading-xslt-filse
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346 |
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347 | After the systemID on the XSLT input file is set, we can run the command from the toplevel GS3
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348 | folder.
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349 | After resolving the URIs of the XSLT files imported by the input XSLT, by setting their systemIDs,
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350 | the input XSLT (and XML) file need not be located in web/interfaces/default/transform anymore.
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351 | */
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352 | public Node transform(File stylesheet, File source, String interfaceName, Document docDocType)
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353 | {
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354 | try
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355 | {
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356 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
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357 | transformerErrorListener.setStylesheet(stylesheet);
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358 |
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359 | // http://stackoverflow.com/questions/3699860/resolving-relative-paths-when-loading-xslt-files
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360 | Source xsltSource = new StreamSource(new InputStreamReader(new FileInputStream(stylesheet), "UTF-8"));
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361 | URI systemID = stylesheet.toURI();
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362 | try {
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363 | URL url = systemID.toURL();
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364 | xsltSource.setSystemId(url.toExternalForm());
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365 | } catch (MalformedURLException mue) {
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366 | logger.error("Warning: Unable to set systemID for stylesheet to " + systemID);
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367 | logger.error("Got exception: " + mue.getMessage(), mue);
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368 | }
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369 |
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370 | this.t_factory.setURIResolver(new ClasspathResourceURIResolver(interfaceName));
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371 | Transformer transformer = this.t_factory.newTransformer(xsltSource);
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372 | // Alternative way of instantiating a newTransformer():
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373 | //Templates cachedXSLT = this.t_factory.newTemplates(xsltSource);
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374 | //Transformer transformer = cachedXSLT.newTransformer();
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375 |
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376 | DOMResult result = (docDocType == null) ? new DOMResult() : new DOMResult(docDocType);
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377 | StreamSource streamSource = new StreamSource(new InputStreamReader(new FileInputStream(source), "UTF-8"));
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378 |
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379 | transformer.setErrorListener(new TransformErrorListener(stylesheet, streamSource));
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380 |
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381 | transformer.transform(streamSource, result);
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382 | return result.getNode().getFirstChild();
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383 | }
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384 | catch (TransformerConfigurationException e)
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385 | {
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386 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't create transformer object for files\n" + stylesheet + "\n" + source, e);
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387 | }
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388 | catch (TransformerException e)
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389 | {
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390 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't transform the source for files\n" + stylesheet + "\n" + source, e);
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391 | }
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392 | catch (UnsupportedEncodingException e)
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393 | {
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394 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't read file due to an unsupported encoding\n" + stylesheet + "\n" + source, e);
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395 | }
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396 | catch (FileNotFoundException e)
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397 | {
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398 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't find the file specified\n" + stylesheet + "\n" + source, e);
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399 | }
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400 | }
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401 |
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402 | /**
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403 | * Class for resolving the relative paths used for <xsl:import>s
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404 | * when transforming XML with an XSLT
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405 | */
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406 | class ClasspathResourceURIResolver implements URIResolver {
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407 | String interface_name;
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408 |
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409 | public ClasspathResourceURIResolver(String interfaceName) {
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410 | interface_name = interfaceName;
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411 | }
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412 |
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413 | /**
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414 | * Override the URIResolver.resolve() method to turn relative paths of imported xslt files into
|
---|
415 | * absolute paths and set these absolute paths as their SystemIDs when loading them into memory.
|
---|
416 | * @see http://stackoverflow.com/questions/3699860/resolving-relative-paths-when-loading-xslt-files
|
---|
417 | */
|
---|
418 |
|
---|
419 | @Override
|
---|
420 | public Source resolve(String href, String base) throws TransformerException {
|
---|
421 |
|
---|
422 | //System.err.println("href: " + href); // e.g. href: layouts/main.xsl
|
---|
423 | //System.err.println("base: " + base); // e.g for *toplevel* base: file:/path/to/gs3-svn/CL1.xslt
|
---|
424 |
|
---|
425 |
|
---|
426 | // 1. for any xsl imported by the original stylesheet, try to work out its absolute path location
|
---|
427 | // by concatenating the parent folder of the base stylesheet file with the href of the file it
|
---|
428 | // imports (which is a path relative to the base file). This need not hold true for the very 1st
|
---|
429 | // base stylesheet: it may be located somewhere entirely different from the greenstone XSLT
|
---|
430 | // files it refers to. This is the case when running transforms on the commandline for testing
|
---|
431 |
|
---|
432 | File importXSLfile = new File(href); // assume the xsl imported has an absolute path
|
---|
433 |
|
---|
434 | if(!importXSLfile.isAbsolute()) { // imported xsl specifies a path relative to parent of base
|
---|
435 | try {
|
---|
436 | URI baseURI = new URI(base);
|
---|
437 | importXSLfile = new File(new File(baseURI).getParent(), href);
|
---|
438 |
|
---|
439 | if(!importXSLfile.exists()) { // if the imported file does not exist, it's not
|
---|
440 | // relative to the base (the stylesheet file importing it). So look in the
|
---|
441 | // interface's transform subfolder for the xsl file to be imported
|
---|
442 | importXSLfile = new File(GSFile.interfaceStylesheetFile(GlobalProperties.getGSDL3Home(), interface_name, href));
|
---|
443 | }
|
---|
444 | } catch(URISyntaxException use) {
|
---|
445 | importXSLfile = new File(href); // try
|
---|
446 | }
|
---|
447 | }
|
---|
448 |
|
---|
449 | String importXSLfilepath = ""; // for printing the expected file path on error
|
---|
450 | try {
|
---|
451 | // path of import XSL file after resolving any .. and . dir paths
|
---|
452 | importXSLfilepath = importXSLfile.getCanonicalPath();
|
---|
453 | } catch(IOException ioe) { // resort to using the absolute path
|
---|
454 | importXSLfilepath = importXSLfile.getAbsolutePath();
|
---|
455 | }
|
---|
456 |
|
---|
457 | // 2. now we know where the XSL file being imported lives, so set the systemID to its
|
---|
458 | // absolute path when loading it into a Source object
|
---|
459 | URI systemID = importXSLfile.toURI();
|
---|
460 | Source importXSLsrc = null;
|
---|
461 | try {
|
---|
462 | importXSLsrc = new StreamSource(new InputStreamReader(new FileInputStream(importXSLfile), "UTF-8"));
|
---|
463 | URL url = systemID.toURL();
|
---|
464 | importXSLsrc.setSystemId(url.toExternalForm());
|
---|
465 | } catch (MalformedURLException mue) {
|
---|
466 | logger.error("Warning: Unable to set systemID for imported stylesheet to " + systemID);
|
---|
467 | logger.error("Got exception: " + mue.getMessage(), mue);
|
---|
468 | } catch(FileNotFoundException fne) {
|
---|
469 | logger.error("ERROR: importXSLsrc file does not exist " + importXSLfilepath);
|
---|
470 | logger.error("\tError msg: " + fne.getMessage(), fne);
|
---|
471 | } catch(UnsupportedEncodingException uee) {
|
---|
472 | logger.error("ERROR: could not resolve relative path of import XSL file " + importXSLfilepath
|
---|
473 | + " because of encoding issues: " + uee.getMessage(), uee);
|
---|
474 | }
|
---|
475 | return importXSLsrc;
|
---|
476 | //return new StreamSource(this.getClass().getClassLoader().getResourceAsStream(href)); // won't work
|
---|
477 | }
|
---|
478 | }
|
---|
479 |
|
---|
480 | public Node transform(File stylesheet, File source)
|
---|
481 | {
|
---|
482 | return transform(stylesheet, source, null);
|
---|
483 | }
|
---|
484 |
|
---|
485 | /** transform method for when the source doc may contain DTD references. eg in gberg collection - the files are kind of outside of greenstone.
|
---|
486 | * pass in an entity resolver, and it will be used by the XMLReader */
|
---|
487 | public Node transform(File stylesheet, File source, Document docDocType, EntityResolver er)
|
---|
488 | {
|
---|
489 | try
|
---|
490 | {
|
---|
491 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
|
---|
492 | transformerErrorListener.setStylesheet(stylesheet);
|
---|
493 | Transformer transformer = this.t_factory.newTransformer(new StreamSource(new InputStreamReader(new FileInputStream(stylesheet), "UTF-8")));
|
---|
494 | DOMResult result = (docDocType == null) ? new DOMResult() : new DOMResult(docDocType);
|
---|
495 |
|
---|
496 | XMLReader reader = XMLReaderFactory.createXMLReader();
|
---|
497 | reader.setEntityResolver(er);
|
---|
498 | SAXSource xmlSource = new SAXSource(reader, new InputSource(new InputStreamReader(new FileInputStream(source), "UTF-8")));
|
---|
499 |
|
---|
500 | transformer.setErrorListener(new TransformErrorListener(stylesheet, xmlSource));
|
---|
501 |
|
---|
502 | transformer.transform(xmlSource, result);
|
---|
503 | return result.getNode().getFirstChild();
|
---|
504 | }
|
---|
505 | catch (SAXException e)
|
---|
506 | {
|
---|
507 | return transformError("XMLTransformer.transform(File, File), couldn't create XMLReader for source\n"+ source, e);
|
---|
508 | }
|
---|
509 | catch (TransformerConfigurationException e)
|
---|
510 | {
|
---|
511 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't create transformer object for files\n" + stylesheet + "\n" + source, e);
|
---|
512 | }
|
---|
513 | catch (TransformerException e)
|
---|
514 | {
|
---|
515 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't transform the source for files\n" + stylesheet + "\n" + source, e);
|
---|
516 | }
|
---|
517 | catch (UnsupportedEncodingException e)
|
---|
518 | {
|
---|
519 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't read file due to an unsupported encoding\n" + stylesheet + "\n" + source, e);
|
---|
520 | }
|
---|
521 | catch (FileNotFoundException e)
|
---|
522 | {
|
---|
523 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't find the file specified\n" + stylesheet + "\n" + source, e);
|
---|
524 | }
|
---|
525 | }
|
---|
526 | // debugAsFile is only to be set to true when either the stylesheet or source parameters
|
---|
527 | // are not objects of type File. The debugAsFile variable is passed into the
|
---|
528 | // TransformErrorListener. When set to true, the TransformErrorListener will itself create
|
---|
529 | // two files containing the stylesheet and source XML, and try to transform the new source
|
---|
530 | // file with the stylesheet file for debugging purposes.
|
---|
531 | protected Node transform(File stylesheet, File source, Document docDocType)
|
---|
532 | {
|
---|
533 | try
|
---|
534 | {
|
---|
535 | TransformErrorListener transformerErrorListener = (TransformErrorListener) this.t_factory.getErrorListener();
|
---|
536 | transformerErrorListener.setStylesheet(stylesheet);
|
---|
537 | Transformer transformer = this.t_factory.newTransformer(new StreamSource(new InputStreamReader(new FileInputStream(stylesheet), "UTF-8")));
|
---|
538 | DOMResult result = (docDocType == null) ? new DOMResult() : new DOMResult(docDocType);
|
---|
539 | StreamSource streamSource = new StreamSource(new InputStreamReader(new FileInputStream(source), "UTF-8"));
|
---|
540 |
|
---|
541 | transformer.setErrorListener(new TransformErrorListener(stylesheet, streamSource));
|
---|
542 |
|
---|
543 | transformer.transform(streamSource, result);
|
---|
544 | return result.getNode().getFirstChild();
|
---|
545 | }
|
---|
546 | catch (TransformerConfigurationException e)
|
---|
547 | {
|
---|
548 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't create transformer object for files\n" + stylesheet + "\n" + source, e);
|
---|
549 | }
|
---|
550 | catch (TransformerException e)
|
---|
551 | {
|
---|
552 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't transform the source for files\n" + stylesheet + "\n" + source, e);
|
---|
553 | }
|
---|
554 | catch (UnsupportedEncodingException e)
|
---|
555 | {
|
---|
556 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't read file due to an unsupported encoding\n" + stylesheet + "\n" + source, e);
|
---|
557 | }
|
---|
558 | catch (FileNotFoundException e)
|
---|
559 | {
|
---|
560 | return transformError("XMLTransformer.transform(File, File)" + "\ncouldn't find the file specified\n" + stylesheet + "\n" + source, e);
|
---|
561 | }
|
---|
562 | }
|
---|
563 |
|
---|
564 | // Given a heading string on the sort of transformation error that occurred and the exception object itself,
|
---|
565 | // this method prints the exception to the tomcat window (system.err) and the greenstone log and then returns
|
---|
566 | // an xhtml error page that is constructed from it.
|
---|
567 | protected Node transformError(String heading, Exception e)
|
---|
568 | {
|
---|
569 | if (e == null) {
|
---|
570 | return constructErrorXHTMLPage(heading);
|
---|
571 | }
|
---|
572 | String message = heading + "\n" + e.getMessage();
|
---|
573 | logger.error(heading + ": " + e.getMessage());
|
---|
574 |
|
---|
575 | if (e instanceof TransformerException)
|
---|
576 | {
|
---|
577 | String location = ((TransformerException) e).getLocationAsString();
|
---|
578 | if (location != null)
|
---|
579 | {
|
---|
580 | logger.error(location);
|
---|
581 | message = message + "\n" + location;
|
---|
582 | }
|
---|
583 | }
|
---|
584 | System.err.println("****\n" + message + "\n****");
|
---|
585 | return constructErrorXHTMLPage(message);
|
---|
586 | }
|
---|
587 |
|
---|
588 | // Given an error message, splits it into separate lines based on any newlines present and generates an xhtml page
|
---|
589 | // (xml Element) with paragraphs for each line. This is then returned so that it can be displayed in the browser.
|
---|
590 | public static Element constructErrorXHTMLPage(String message)
|
---|
591 | {
|
---|
592 | try
|
---|
593 | {
|
---|
594 | String[] lines = message.split("\n");
|
---|
595 |
|
---|
596 | Document xhtmlDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
|
---|
597 | // <html></html>
|
---|
598 | Node htmlNode = xhtmlDoc.createElement("html");
|
---|
599 | xhtmlDoc.appendChild(htmlNode);
|
---|
600 | // <head></head>
|
---|
601 | Node headNode = xhtmlDoc.createElement("head");
|
---|
602 | htmlNode.appendChild(headNode);
|
---|
603 | // <title></title>
|
---|
604 | Node titleNode = xhtmlDoc.createElement("title");
|
---|
605 | headNode.appendChild(titleNode);
|
---|
606 | Node titleString = xhtmlDoc.createTextNode("Error occurred");
|
---|
607 | titleNode.appendChild(titleString);
|
---|
608 |
|
---|
609 | // <body></body>
|
---|
610 | Node bodyNode = xhtmlDoc.createElement("body");
|
---|
611 | htmlNode.appendChild(bodyNode);
|
---|
612 |
|
---|
613 | // finally put the message in the body
|
---|
614 | Node h1Node = xhtmlDoc.createElement("h1");
|
---|
615 | bodyNode.appendChild(h1Node);
|
---|
616 | Node headingString = xhtmlDoc.createTextNode("The following error occurred:");
|
---|
617 | h1Node.appendChild(headingString);
|
---|
618 |
|
---|
619 | //Node textNode = xhtmlDoc.createTextNode(message);
|
---|
620 | //bodyNode.appendChild(textNode);
|
---|
621 |
|
---|
622 | for (int i = 0; i < lines.length; i++)
|
---|
623 | {
|
---|
624 | Node pNode = xhtmlDoc.createElement("p");
|
---|
625 | Node textNode = xhtmlDoc.createTextNode(lines[i]);
|
---|
626 | pNode.appendChild(textNode);
|
---|
627 | bodyNode.appendChild(pNode);
|
---|
628 | }
|
---|
629 |
|
---|
630 | return xhtmlDoc.getDocumentElement();
|
---|
631 |
|
---|
632 | }
|
---|
633 | catch (Exception e)
|
---|
634 | {
|
---|
635 | String errmsg = "Exception trying to construct error xhtml page from message: " + message + "\n" + e.getMessage();
|
---|
636 | System.err.println(errmsg);
|
---|
637 | logger.error(errmsg);
|
---|
638 | return null;
|
---|
639 | }
|
---|
640 | }
|
---|
641 |
|
---|
642 | // ErrorListener class for both Transformer objects and TransformerFactory objects.
|
---|
643 | // This class can be used to register a handler for any fatal errors, errors and warnings that
|
---|
644 | // may occur when either transforming an xml file with an xslt stylesheet using the XMLTransformer,
|
---|
645 | // or when instantiating a Transformer object using the XMLTransformer's TransformerFactory member var.
|
---|
646 | // The latter case occurs when the xml Source used to instantiate a Transformer from a TransformerFactory
|
---|
647 | // is invalid in some manner, which results in a null Transformer object. However, as no
|
---|
648 | // TransformerConfigurationException or TransformerException are thrown in this case, the errors
|
---|
649 | // would have not been noticed until things go wrong later when trying to use the (null) Transformer.
|
---|
650 | //
|
---|
651 | // The errors caught by this ErrorListener class are printed both to the greenstone.log and to the
|
---|
652 | // tomcat console (System.err), and the error message is stored in the errorMessage variable so that
|
---|
653 | // it can be retrieved and be used to generate an xhtml error page.
|
---|
654 | public class TransformErrorListener implements ErrorListener
|
---|
655 | {
|
---|
656 | protected String errorMessage = null;
|
---|
657 | protected String stylesheet = null;
|
---|
658 | protected Source source = null; // can be DOMSource or StreamSource
|
---|
659 | protected boolean debugAsFile = true; // true if xslt or source are not real physical files
|
---|
660 |
|
---|
661 | // *********** METHODS TO BE CALLED WHEN SETTING AN ERROR LISTENER ON TRANSFORMERFACTORY OBJECTS
|
---|
662 | // The default constructor is only for when setting an ErrorListener on TransformerFactory objects
|
---|
663 | public TransformErrorListener()
|
---|
664 | {
|
---|
665 | this.stylesheet = null;
|
---|
666 | this.source = null;
|
---|
667 | XMLTransformer.debugFileCount++;
|
---|
668 | }
|
---|
669 |
|
---|
670 | public void setStylesheet(Document xslt)
|
---|
671 | {
|
---|
672 | this.debugAsFile = true;
|
---|
673 | this.stylesheet = GSXML.elementToString(xslt.getDocumentElement(), true);
|
---|
674 | this.source = null;
|
---|
675 | }
|
---|
676 |
|
---|
677 | public void setStylesheet(String xslt)
|
---|
678 | {
|
---|
679 | this.debugAsFile = true;
|
---|
680 | this.stylesheet = xslt;
|
---|
681 | this.source = null;
|
---|
682 | }
|
---|
683 |
|
---|
684 | public void setStylesheet(File xslt)
|
---|
685 | {
|
---|
686 | this.debugAsFile = false; // if this constructor is called, we're dealing with physical files for both xslt and source
|
---|
687 | this.stylesheet = xslt.getAbsolutePath();
|
---|
688 | this.source = null;
|
---|
689 | }
|
---|
690 |
|
---|
691 | // *********** METHODS TO BE CALLED WHEN SETTING AN ERROR LISTENER ON TRANSFORMERFACTORY OBJECTS
|
---|
692 | // When setting an ErrorListener on Transformer object, the ErrorListener takes a Stylesheet xslt and a Source
|
---|
693 | public TransformErrorListener(String xslt, Source source)
|
---|
694 | {
|
---|
695 | this.stylesheet = xslt;
|
---|
696 | this.source = source;
|
---|
697 | XMLTransformer.debugFileCount++;
|
---|
698 | }
|
---|
699 |
|
---|
700 | public TransformErrorListener(Document xslt, Source source)
|
---|
701 | {
|
---|
702 | this.stylesheet = GSXML.elementToString(xslt.getDocumentElement(), true);
|
---|
703 | this.source = source;
|
---|
704 | XMLTransformer.debugFileCount++;
|
---|
705 | }
|
---|
706 |
|
---|
707 | public TransformErrorListener(File xslt, Source source)
|
---|
708 | {
|
---|
709 | this.debugAsFile = false; // if this constructor is called, we're dealing with physical files for both xslt and source
|
---|
710 | this.source = source;
|
---|
711 | this.stylesheet = xslt.getAbsolutePath(); // not necessary to get the string from the file
|
---|
712 | // all we were going to do with it *on error* was write it out to a file anyway
|
---|
713 | }
|
---|
714 |
|
---|
715 | // *********** METHODS CALLED AUTOMATICALLY ON ERROR
|
---|
716 |
|
---|
717 | // Receive notification of a recoverable error.
|
---|
718 | public void error(TransformerException exception)
|
---|
719 | {
|
---|
720 | handleError("Error:\n", exception);
|
---|
721 | }
|
---|
722 |
|
---|
723 | // Receive notification of a non-recoverable error.
|
---|
724 | public void fatalError(TransformerException exception)
|
---|
725 | {
|
---|
726 | handleError("Fatal Error:\n", exception);
|
---|
727 | }
|
---|
728 |
|
---|
729 | // Receive notification of a warning.
|
---|
730 | public void warning(TransformerException exception)
|
---|
731 | {
|
---|
732 | handleError("Warning:\n", exception);
|
---|
733 | }
|
---|
734 |
|
---|
735 | public String toString(TransformerException e)
|
---|
736 | {
|
---|
737 | String msg = "Exception encountered was:\n\t";
|
---|
738 | String location = e.getLocationAsString();
|
---|
739 | if (location != null)
|
---|
740 | {
|
---|
741 | msg = msg + "Location: " + location + "\n\t";
|
---|
742 | }
|
---|
743 |
|
---|
744 | return msg + "Message: " + e.getMessage();
|
---|
745 | }
|
---|
746 |
|
---|
747 | // clears the errorPage variable after the first call to this method
|
---|
748 | public String getErrorMessage()
|
---|
749 | {
|
---|
750 | String errMsg = this.errorMessage;
|
---|
751 | if (this.errorMessage != null)
|
---|
752 | {
|
---|
753 | this.errorMessage = null;
|
---|
754 | }
|
---|
755 | return errMsg;
|
---|
756 | }
|
---|
757 |
|
---|
758 | // sets the errorMessage member variable to the data stored in the exception
|
---|
759 | // and writes the errorMessage to the logger and tomcat's System.err
|
---|
760 | protected void handleError(String errorType, TransformerException exception)
|
---|
761 | {
|
---|
762 |
|
---|
763 | this.errorMessage = errorType + toString(exception);
|
---|
764 |
|
---|
765 | // If either the stylesheet or the source to be transformed with it were not files,
|
---|
766 | // so that the transformation was performed in-memory, then the "location" information
|
---|
767 | // during the error handling (if any) wouldn't have been helpful.
|
---|
768 | // To allow proper debugging, we write both stylesheet and source out as physical files
|
---|
769 | // and perform the same transformation again, so that when a transformation error does
|
---|
770 | // occur, the files are not in-memory but can be viewed, and any location information
|
---|
771 | // for the error given by the ErrorListener will be sensible (instead of the unhelpful
|
---|
772 | // "line#0 column#0 in file://somewhere/dummy.xsl").
|
---|
773 | // Note that if the stylesheet and the source it is to transform were both physical
|
---|
774 | // files to start off with, we will not need to perform the same transformation again
|
---|
775 | // since the error reporting would have provided accurate locations for those.
|
---|
776 | if (debugAsFile)
|
---|
777 | {
|
---|
778 | System.err.println("\n****Original error transforming xml:\n" + this.errorMessage + "\n****\n");
|
---|
779 | System.err.println("***** About to perform the transform again with actual files\n******\n");
|
---|
780 | logger.error("Original transformation error: " + this.errorMessage);
|
---|
781 | logger.error("**** About to perform transform again with actual files");
|
---|
782 |
|
---|
783 |
|
---|
784 | performTransformWithPhysicalFiles(); // will give accurate line numbers
|
---|
785 |
|
---|
786 | // No need to print out the current error message (seen in the Else statement below),
|
---|
787 | // as the recursive call to XMLTransformer.transform(File, File, false) in method
|
---|
788 | // performTransformWithPhysicalFiles() will do this for us.
|
---|
789 | }
|
---|
790 | else
|
---|
791 | {
|
---|
792 | // printing out the error message
|
---|
793 | // since !debugAsFile, we are dealing with physical files,
|
---|
794 | // variable stylesheet would have stored the filename instead of contents
|
---|
795 | this.errorMessage = this.errorMessage + "\nstylesheet filename: " + stylesheet;
|
---|
796 |
|
---|
797 | this.errorMessage += "\nException CAUSE:\n" + exception.getCause();
|
---|
798 | System.err.println("\n****Error transforming xml:\n" + this.errorMessage + "\n****\n");
|
---|
799 | //System.err.println("Stylesheet was:\n + this.stylesheet + "************END STYLESHEET***********\n\n");
|
---|
800 |
|
---|
801 | logger.error(this.errorMessage);
|
---|
802 |
|
---|
803 | // now print out the source to a file, and run the stylesheet on it using a transform()
|
---|
804 | // then any error will be referring to one of these two input files.
|
---|
805 | }
|
---|
806 | }
|
---|
807 |
|
---|
808 | // This method will redo the transformation that went wrong with *real* files:
|
---|
809 | // it writes out the stylesheet and source XML to files first, then performs the transformation
|
---|
810 | // to get the actual line location of where things went wrong (instead of "line#0 column#0 in dummy.xsl")
|
---|
811 | protected void performTransformWithPhysicalFiles()
|
---|
812 | {
|
---|
813 | File webLogsTmpFolder = new File(GlobalProperties.getGSDL3Home() + File.separator + "logs" + File.separator + "tmp");
|
---|
814 | if (!webLogsTmpFolder.exists())
|
---|
815 | {
|
---|
816 | webLogsTmpFolder.mkdirs(); // create any necessary folders
|
---|
817 | }
|
---|
818 | File styleFile = new File(webLogsTmpFolder + File.separator + "stylesheet" + XMLTransformer.debugFileCount + ".xml");
|
---|
819 | File sourceFile = new File(webLogsTmpFolder + File.separator + "source" + XMLTransformer.debugFileCount + ".xml");
|
---|
820 | try
|
---|
821 | {
|
---|
822 | // write stylesheet to a file called stylesheet_systemID in tmp
|
---|
823 | FileWriter styleSheetWriter = new FileWriter(styleFile);
|
---|
824 | styleSheetWriter.write(stylesheet, 0, stylesheet.length());
|
---|
825 | styleSheetWriter.flush();
|
---|
826 | styleSheetWriter.close();
|
---|
827 | }
|
---|
828 | catch (Exception e)
|
---|
829 | {
|
---|
830 | System.err.println("*** Exception when trying to write out stylesheet to " + styleFile.getAbsolutePath());
|
---|
831 | }
|
---|
832 |
|
---|
833 | if (this.source != null)
|
---|
834 | { // ErrorListener was set on a Transformer object
|
---|
835 | try
|
---|
836 | {
|
---|
837 | FileWriter srcWriter = new FileWriter(sourceFile);
|
---|
838 | String contents = "";
|
---|
839 | if (source instanceof DOMSource)
|
---|
840 | {
|
---|
841 | DOMSource domSource = (DOMSource) source;
|
---|
842 | Document doc = (Document) domSource.getNode();
|
---|
843 | contents = GSXML.elementToString(doc.getDocumentElement(), true);
|
---|
844 | //contents = GSXML.xmlNodeToXMLString(domSource.getNode());
|
---|
845 | }
|
---|
846 | else if (source instanceof StreamSource)
|
---|
847 | {
|
---|
848 | StreamSource streamSource = (StreamSource) source;
|
---|
849 | BufferedReader reader = new BufferedReader(streamSource.getReader());
|
---|
850 | String line = "";
|
---|
851 | while ((line = reader.readLine()) != null)
|
---|
852 | {
|
---|
853 | contents = contents + line + "\n";
|
---|
854 | }
|
---|
855 | }
|
---|
856 | srcWriter.write(contents, 0, contents.length());
|
---|
857 | srcWriter.flush();
|
---|
858 | srcWriter.close();
|
---|
859 | }
|
---|
860 | catch (Exception e)
|
---|
861 | {
|
---|
862 | System.err.println("*** Exception when trying to write out stylesheet to " + sourceFile.getAbsolutePath());
|
---|
863 | }
|
---|
864 | }
|
---|
865 |
|
---|
866 | System.err.println("*****************************************");
|
---|
867 | System.err.println("Look for stylesheet in: " + styleFile.getAbsolutePath());
|
---|
868 | if (this.source != null)
|
---|
869 | { // ErrorListener was set on a Transformer object
|
---|
870 | System.err.println("Look for source XML in: " + sourceFile.getAbsolutePath());
|
---|
871 | }
|
---|
872 |
|
---|
873 | // now perform the transform again, which will assign another TransformErrorListener
|
---|
874 | // but since debuggingAsFile is turned off, we won't recurse into this section of
|
---|
875 | // handling the error again
|
---|
876 | if (this.source != null)
|
---|
877 | { // ErrorListener was set on a Transformer object
|
---|
878 | XMLTransformer.this.transform(styleFile, sourceFile); // calls the File, File version, so debugAsFile will be false
|
---|
879 | }
|
---|
880 | else
|
---|
881 | { // ErrorListener was set on a TransformerFactory object
|
---|
882 |
|
---|
883 | // The recursive step in this case is to perform the instantiation
|
---|
884 | // of the Transformer object again.
|
---|
885 | // Only one TransformerFactory object per XMLTransformer,
|
---|
886 | // and only one TransformerHandler object set on any TransformerFactory
|
---|
887 | // But the stylesheet used to create a Transformer from that TransformerFactory
|
---|
888 | // object changes each time, by calls to setStylesheet(),
|
---|
889 | // Therefore, the debugAsFile state for the single TransformerFactory's
|
---|
890 | // TransformerHandler changes each time also.
|
---|
891 |
|
---|
892 | try
|
---|
893 | {
|
---|
894 | debugAsFile = false;
|
---|
895 | this.stylesheet = styleFile.getAbsolutePath();
|
---|
896 | //TransformErrorListener transformerErrorListener = (TransformErrorListener)XMLTransformer.this.t_factory.getErrorListener();
|
---|
897 | //transformerErrorListener.setStylesheet(styleFile);
|
---|
898 | Transformer transformer = XMLTransformer.this.t_factory.newTransformer(new StreamSource(styleFile));
|
---|
899 | if (transformer == null)
|
---|
900 | {
|
---|
901 | String msg = "XMLTransformer transformer is " + transformer;
|
---|
902 | logger.info(msg);
|
---|
903 | System.out.println(msg + "\n****\n");
|
---|
904 | }
|
---|
905 | }
|
---|
906 | catch (TransformerConfigurationException e)
|
---|
907 | {
|
---|
908 | String message = "Couldn't create transformer object: " + e.getMessageAndLocation();
|
---|
909 | logger.error(message);
|
---|
910 | logger.error(e.getLocationAsString());
|
---|
911 | System.out.println(message);
|
---|
912 | }
|
---|
913 | }
|
---|
914 | }
|
---|
915 | }
|
---|
916 | }
|
---|