1 | package org.greenstone.gsdl3.gs3build.doctypes;
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2 |
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3 | import java.io.File;
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4 | import java.net.URL;
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5 | import java.net.MalformedURLException;
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6 |
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7 | import java.util.List;
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8 | import java.util.Map;
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9 | import java.util.ArrayList;
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10 |
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11 | import org.greenstone.gsdl3.gs3build.metadata.*;
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12 | import org.greenstone.gsdl3.gs3build.util.*;
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13 | import org.greenstone.gsdl3.gs3build.xpointer.XPointer;
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14 |
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15 | import org.w3c.dom.*;
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16 |
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17 | public class HTMLDocument extends AbstractDocument
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18 | {
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19 | public static final String HTML_DOCUMENT_TYPE = "HTML";
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20 | Document domDocument;
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21 |
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22 | public HTMLDocument(DocumentID id)
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23 | { super(id);
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24 | this.domDocument = null;
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25 | }
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26 |
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27 | /**
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28 | * Create the HTMLDocument from a given URL - the URL may in fact be a reference
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29 | * to a local file.
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30 | *
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31 | * @param <code>URL</code> The location from which to load the file
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32 | */
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33 | public HTMLDocument(URL url)
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34 | { super(url);
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35 |
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36 | this.loadDocument(url);
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37 |
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38 | this._extractDocumentFiles();
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39 | this._extractDocumentMetadata();
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40 |
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41 | HTMLDocumentTools docTools = new HTMLDocumentTools(this.domDocument);
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42 | docTools.setMetsDocument(this);
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43 | docTools.setUrl(this.fileSet.getFile(0).getLocation());
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44 | docTools.findSections();
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45 | METSStructure sectionStruct = docTools.getStructure();
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46 |
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47 | if (sectionStruct.size() > 0) {
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48 | METSStructureSet structureSet = this.getDocumentStructure();
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49 | structureSet.addStructure(sectionStruct);
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50 | }
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51 | }
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52 |
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53 | private void loadDocument(URL url)
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54 | {
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55 | // HTMLDoc htmlDoc;
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56 | HTMLTidy tidyDoc;
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57 | if (url.toString().startsWith("file://"))
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58 | { //htmlDoc = new HTMLDoc(url, url.toString().substring(7));
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59 | tidyDoc = new HTMLTidy(new File(url.toString().substring(7)));
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60 | }
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61 | else if (url.toString().startsWith("file:/"))
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62 | { //htmlDoc = new HTMLDoc(url, url.toString().substring(5));
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63 | tidyDoc = new HTMLTidy(new File( url.toString().substring(5)));
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64 | }
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65 | else
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66 | { //htmlDoc = new HTMLDoc(url);
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67 | tidyDoc = new HTMLTidy(url);
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68 | }
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69 |
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70 | this.domDocument = tidyDoc.getDocument();
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71 | }
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72 |
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73 | private void _extractDocumentMetadata()
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74 | {
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75 | NodeList metadata = this.domDocument.getElementsByTagName("META");
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76 | for (int n = 0; n < metadata.getLength(); n ++) {
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77 | Node node = metadata.item(n);
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78 | Element element = (Element) node;
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79 |
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80 | String name = element.getAttribute("name");
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81 | if (name == null || name.length() == 0) {
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82 | continue;
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83 | }
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84 |
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85 | String value = element.getAttribute("content");
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86 | if (value == null || value.length() == 0) {
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87 | value = name;
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88 | }
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89 |
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90 | this.addDocumentMetadata(new MetadataLabel(name), value);
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91 | }
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92 |
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93 | NodeList titles = this.domDocument.getElementsByTagName("TITLE");
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94 | StringBuffer title = new StringBuffer();
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95 | for (int n = 0; n < titles.getLength(); n ++) {
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96 | Node node = titles.item(n);
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97 | Element element = (Element) node;
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98 |
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99 | NodeList childNodes = node.getChildNodes();
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100 | for (int c = 0; c < childNodes.getLength(); c ++) {
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101 | Node child = childNodes.item(c);
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102 | if (child.getNodeType() == org.w3c.dom.Node.TEXT_NODE) {
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103 | title.append(child.getNodeValue());
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104 | }
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105 | }
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106 | }
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107 |
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108 | if (title.length() > 0)
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109 | { this.addDocumentMetadata(new MetadataLabel("title"), title.toString());
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110 | }
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111 |
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112 | /* Old HTMLDoc based parsing...
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113 | HTMLBlock codedContent = htmlDoc.getCodedContent();
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114 | boolean inTitle = false;
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115 | title = new StringBuffer();
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116 |
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117 | for (int e = 0; e < codedContent.size(); e ++)
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118 | { if (codedContent.elementAt(e) instanceof HTMLTag)
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119 | { HTMLTag tag = (HTMLTag) codedContent.elementAt(e);
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120 |
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121 | if (tag.tagName().equals("meta"))
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122 | { // check that the name of the metadata item exists
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123 | String name = tag.idValue("name");
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124 | if (name == null || name.length() == 0) {
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125 | continue;
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126 | }
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127 |
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128 | // get the value, if it exists
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129 | String value = tag.idValue("content");
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130 |
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131 | // if value does not exist, default it to being the same
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132 | // as the name.
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133 | if (value == null || value.length() > 0) {
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134 | value = name;
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135 | }
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136 | }
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137 | else
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138 | if (tag.tagName().equals("title"))
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139 | { inTitle = true;
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140 | }
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141 | else if (tag.tagName().equals("/title"))
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142 | { inTitle = false;
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143 | }
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144 | // cut off when real body content appears - not a perfect
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145 | // implementation, just cheap & cheerful
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146 | else if (tag.tagName().equals("/head"))
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147 | { break;
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148 | }
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149 | else if (tag.tagName().equals("body"))
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150 | { break;
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151 | }
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152 | }
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153 | else if (inTitle == true)
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154 | { title.append(codedContent.elementAt(e).toString());
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155 | }
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156 | }
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157 | */
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158 | }
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159 |
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160 | private void _extractDocumentFiles()
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161 | { URL homeUrl = this.fileSet.getFile(0).getLocation();
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162 |
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163 | NodeList metadata = this.domDocument.getElementsByTagName("img");
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164 | for (int n = 0; n < metadata.getLength(); n ++) {
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165 | Node node = metadata.item(n);
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166 | Element element = (Element) node;
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167 |
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168 | String location = element.getAttribute("src");
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169 | if (location == null || location.length() == 0) {
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170 | System.out.println("No name");
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171 | continue;
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172 | }
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173 |
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174 | try
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175 | { // make the url for the image, and then add it to the document list of
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176 | //
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177 | URL imgUrl = new URL(homeUrl, location);
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178 | METSFile file = this.fileSet.addFile(imgUrl);
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179 | this.structureSet.getStructure("All").getDivision("All").addFileReference(file.getID());
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180 | }
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181 | catch (MalformedURLException ex)
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182 | { // TODO: report exception/failure to resolve...
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183 | }
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184 | }
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185 |
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186 | /**
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187 | HTMLBlock codedContent = htmlDoc.getCodedContent();
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188 | for (int e = 0; e < codedContent.size(); e ++)
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189 | { if (codedContent.elementAt(e) instanceof HTMLTag)
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190 | { HTMLTag tag = (HTMLTag) codedContent.elementAt(e);
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191 |
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192 | if (tag.tagName().equals("img"))
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193 | { String location = tag.idValue("src");
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194 |
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195 | try
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196 | { // make the url for the image, and then add it to the document list of
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197 | //
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198 | URL imgUrl = new URL(homeUrl, location);
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199 | METSFile file = this.fileSet.addFile(imgUrl);
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200 | this.structureSet.getStructure("All").getDivision("All").addFileReference(file.getID());
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201 | }
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202 | catch (MalformedURLException ex)
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203 | { // TODO: report exception/failure to resolve...
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204 | }
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205 | }
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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 |
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211 | public String getDocumentType()
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212 | { return HTML_DOCUMENT_TYPE;
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213 | }
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214 |
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215 | public String getDocumentText()
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216 | {
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217 | HTMLDoc htmlDoc;
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218 | URL url =(URL) this.fileSet.getFile(0).getLocation();
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219 |
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220 | this.getSectionText("1");
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221 |
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222 | if (url.toString().startsWith("file://"))
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223 | { htmlDoc = new HTMLDoc(url, url.toString().substring(7));
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224 | }
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225 | else if (url.toString().startsWith("file:/"))
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226 | { htmlDoc = new HTMLDoc(url, url.toString().substring(5));
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227 | }
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228 | else
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229 | { htmlDoc = new HTMLDoc(url);
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230 | }
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231 | return htmlDoc.getContent();
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232 | }
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233 |
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234 | public Document getDOMDocument()
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235 | {
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236 | if (this.domDocument == null) {
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237 | URL url =(URL) this.fileSet.getFile(0).getLocation();
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238 | this.loadDocument(url);
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239 | }
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240 | return this.domDocument;
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241 | }
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242 |
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243 | private XPointer getXPointer(METSDivision division)
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244 | { String fileId = division.getDefaultFileReference();
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245 |
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246 | if (fileId == null) {
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247 | System.err.println("Unable to obtain file reference for section " + division.getLabel());
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248 | return null;
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249 | }
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250 |
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251 | METSFileGroup fileGroup = this.getDocumentFiles().getGroup(fileId);
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252 | if (fileGroup == null) {
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253 | System.err.println("Unable to obtain file reference for filegroup " + fileId);
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254 | return null;
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255 | }
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256 |
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257 | METSFile file = fileGroup.getFile(0);
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258 | if (file == null) {
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259 | System.err.println("Unable to obtain any files within filegroup " + fileId);
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260 | return null;
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261 | }
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262 |
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263 | URL url = file.getLocation();
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264 | XPointer xpointer = XPointer.processXPointer(this.domDocument, url);
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265 |
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266 | return xpointer;
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267 | }
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268 |
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269 | private XPointer getXPointer(String sectionId)
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270 | { if (this.domDocument == null) {
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271 | URL url =(URL) this.fileSet.getFile(0).getLocation();
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272 | this.loadDocument(url);
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273 | }
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274 |
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275 | METSDivision division =
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276 | this.getDocumentStructure().getDivision(METSStructureSet.GSDL3_SECTION_STRUCTURE,
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277 | sectionId);
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278 | if (division == null) {
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279 | // System.err.println("Unable to locate section " + sectionId);
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280 | return null;
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281 | }
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282 |
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283 | return this.getXPointer(division);
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284 | }
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285 |
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286 | public Node getSectionStartNode(METSDivision division)
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287 | { XPointer xpointer = this.getXPointer(division);
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288 | return xpointer.getStartNode();
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289 | }
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290 |
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291 | public Node getSectionStartNode(String sectionId)
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292 | { XPointer xpointer = this.getXPointer(sectionId);
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293 |
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294 | return xpointer.getStartNode();
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295 | }
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296 |
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297 | public String getSectionText(String sectionId)
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298 | { XPointer xpointer = this.getXPointer(sectionId);
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299 |
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300 | if (xpointer == null) {
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301 | return "";
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302 | }
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303 |
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304 | // get the XML content of the xpointer...
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305 | return xpointer.toString();
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306 | }
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307 | }
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