1 | /**
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2 | *#########################################################################
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3 | * QBRSOAPServer.java.in: a template for a SOAPServer providing
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4 | * basic Query, Browse, Retrieve web services for Greenstone 3.
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5 | * Part of the Greenstone digital library suite from the New Zealand
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6 | * Digital Library Project at the University of Waikato, New Zealand.
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7 | * <BR><BR>
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8 | * Copyright (C) 2008 New Zealand Digital Library Project
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9 | * <BR><BR>
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | * <BR><BR>
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | * <BR><BR>
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20 | * @author ak19
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21 | * based on Katherine Don's SOAPServer@sitename@ template file.
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22 | *########################################################################
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23 | */
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24 |
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25 | package org.greenstone.gsdl3;
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26 |
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27 | import java.io.File;
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28 | import java.io.InputStream;
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29 |
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30 | import java.util.Properties;
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31 | import java.util.Enumeration;
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32 | import java.util.Map;
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33 | import java.util.Map.Entry;
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34 | import java.util.HashMap;
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35 | import java.util.Set;
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36 | import java.util.Iterator;
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37 |
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38 | import org.w3c.dom.Document;
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39 | import org.w3c.dom.Element;
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40 | import org.w3c.dom.NodeList;
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41 | import org.w3c.dom.Node;
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42 |
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43 | import org.greenstone.util.GlobalProperties;
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44 | import org.greenstone.gsdl3.core.MessageRouter;
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45 | import org.greenstone.gsdl3.util.GSFile;
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46 | import org.greenstone.gsdl3.util.GSXML;
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47 | import org.greenstone.gsdl3.util.UserContext;
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48 | import org.greenstone.gsdl3.util.XMLConverter;
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49 |
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50 | import org.apache.log4j.Logger; // Import log4j classes
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51 |
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52 | /*
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53 | * Add to $GSDLHOME/web/WEB-INF/server-config.wsdd:
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54 | * <service name="GS3WebServices" provider="java:RPC">
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55 | * <parameter name="allowedMethods" value="*"/>
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56 | * <parameter name="className" value="org.greenstone.gs3services.GS3WebServices"/>
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57 | * </service>
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58 | */
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59 |
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60 | /** Class that provides the basic Query, Browse and Retrieve (QBR) web service
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61 | * operations for Greenstone 3.
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62 | * It contains a MessageRouter that carries out all the tasks by calling the
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63 | * appropriate Greenstone functionality for each request message passed to it,
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64 | * and returning a response message.
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65 | *
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66 | * All response messages are returned from the MessageRouter to clients invoking
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67 | * the web services. All return values are strings that represent XML messages.
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68 | *
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69 | * Method help() reads from the file QBRWebServicesHelp.properties to list the web
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70 | * service operations available. Method helpWithMethod(String methodName)
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71 | * reads from the same file to display a description of the requested operation.
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72 | * (These method descriptions are mostly the same as those in the Javadoc
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73 | * comments.)
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74 | *
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75 | * NOTE: The folder containing this web service class' properties helpFile
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76 | * should be on the classpath. (QBRWebServicesHelp.properties)
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77 | * @author ak19
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78 | */
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79 | public class QBRSOAPServer@sitename@ {
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80 | /** site_name the MessageRouter works with, here set to "localsite" */
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81 | protected String site_name = "@sitename@";
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82 |
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83 | /** Message Router object to pass requests messages to and which
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84 | * will process them.*/
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85 | protected MessageRouter mr = null;
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86 |
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87 | /** Container Document to create XML Nodes */
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88 | protected Document doc=null;
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89 | /** A converter class to parse XML and create Docs */
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90 | protected XMLConverter converter=null;
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91 |
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92 | /** The Logger for this class */
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93 | private static Logger LOG = Logger.getLogger(QBRSOAPServer@[email protected]);
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94 |
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95 | /** Error message loading helpFile. Remains at "" if everything is fine */
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96 | protected static String helpErrormessage = "";
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97 | /** Properties map with mappings from methodname to help
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98 | * description string. */
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99 | protected static Properties properties;
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100 | /** The help properties file describing the web service operations */
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101 | protected static String helpFile = "QBRWebServicesHelp.properties";
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102 |
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103 | // static code block to initialise the help Properties from the helpFile
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104 | static {
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105 | properties = new Properties();
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106 | // load the properties file from a location with respect to the
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107 | // the Web Service .class file
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108 | InputStream input = null;
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109 | try {
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110 | // load the properties file from a location with respect to the
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111 | // the Web Service .class file
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112 | input
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113 | = QBRSOAPServer@[email protected]().getResourceAsStream(
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114 | helpFile);
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115 | if(input == null) {
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116 | helpErrormessage = "Cannot find file " + helpFile + " to load.";
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117 | LOG.warn(helpErrormessage);
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118 | } else {
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119 | properties.load(input);
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120 | input.close();
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121 | }
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122 | } catch(Exception e) {
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123 | helpErrormessage = "Exception loading properties from help file "
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124 | + helpFile + "\n" + e.getMessage();
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125 | LOG.warn("Exception loading properties from help file "
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126 | + helpFile + "\n" + e.getMessage());
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127 | }
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128 | }
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129 |
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130 |
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131 | /* Describe subset options for the various Greenstone3 modules */
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132 | protected static final String mrSubsetOptions = // messageRouter
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133 | "collectionList serviceClusterList serviceList siteList";
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134 | protected static final String csSubsetOptions = // collections and serviceClusters
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135 | "metadataList serviceList displayItemList";
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136 | protected static final String serviceSubsetOptions = // services
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137 | "paramList displayItemList";
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138 | protected static final String structureOptions =
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139 | "entire ancestors parent siblings children descendants"; // note the spelling
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140 | protected static final String structureInfoOptions =
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141 | "numSiblings siblingPosition numChildren";
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142 |
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143 |
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144 | /** Constructor that initializes the web services' MessageRouter object
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145 | * Reads from GlobalProperties to get gsdl3_home and set the sitename. */
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146 | public QBRSOAPServer@sitename@() {
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147 | String gsdl3_home = GlobalProperties.getGSDL3Home();
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148 | if (gsdl3_home == null || gsdl3_home.equals("")) {
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149 | LOG.error(
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150 | "Couldn't access GSDL3Home from GlobalProperties.getGSDL3HOME,"
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151 | + "can't initialize the SOAP Server.");
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152 | return;
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153 | }
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154 |
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155 | String site_home = GSFile.siteHome(gsdl3_home, this.site_name);
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156 |
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157 | File site_file = new File(site_home);
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158 | if (!site_file.isDirectory()) {
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159 | LOG.error("The site directory "+site_file.getPath()
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160 | +" doesn't exist. Can't initialize the SOAP Server.");
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161 | return;
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162 | }
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163 | this.converter = new XMLConverter();
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164 | this.doc = this.converter.newDOM();
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165 |
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166 | mr = new MessageRouter();
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167 | mr.setSiteName(this.site_name);
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168 | mr.configure();
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169 | }
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170 |
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171 | /* (1) DESCRIBE MESSAGES, manual pages 35-41 */
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172 | /** Sends a describe message to the MessageRouter.
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173 | * @param lang is the language of the display content in the response.
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174 | * @param subsetOption are the requested list of items to return in the
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175 | * response. For the Message Router this can be collectionList,
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176 | * serviceClusterList, serviceList, siteList
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177 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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178 | */
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179 | public String describe(String lang, String subsetOption)
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180 | {
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181 | return describe("", lang, subsetOption, mrSubsetOptions);
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182 | }
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183 |
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184 | /** For sending Describe messages to ServiceClusters.
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185 | * @param serviceCluster is the name of the Service Cluster that this describe
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186 | * request is sent to.
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187 | * @param lang is the language of the display content in the response
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188 | * @param subsetOption is the requested list of items to return in the response
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189 | * For Service Clusters this can be metadataList, serviceList, displayItemList.
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190 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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191 | */
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192 | public String describeServiceCluster(
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193 | String serviceCluster, String lang, String subsetOption)
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194 | {
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195 | return describe(serviceCluster, lang, subsetOption, csSubsetOptions);
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196 | }
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197 |
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198 | /** For sending Describe messages to Collections.
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199 | * @param collection is the name of the Collection that this describe request
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200 | * is sent to.
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201 | * @param lang is the language of the display content in the response
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202 | * @param subsetOption is the requested list of items to return in the response
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203 | * For Collections this can be metadataList, serviceList and displayItemList.
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204 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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205 | */
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206 | public String describeCollection(
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207 | String collection, String lang, String subsetOption)
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208 | {
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209 | return describe(collection, lang, subsetOption, csSubsetOptions);
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210 | }
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211 |
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212 | /**
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213 | * For sending a describe message to a Collection's Service.
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214 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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215 | * @param collection is the name of the Collection whose service
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216 | * this describe request is sent to.
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217 | * @param service is the name of the Service (of that collection) to
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218 | * which this describe request is sent.
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219 | * @param lang is the language of the display content in the response
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220 | * @param subsetOption is the requested list of items to return in the response
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221 | * For Services this can be paramList, displayItemList */
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222 | public String describeCollectionService(String collection, String service,
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223 | String lang, String subsetOption)
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224 | {
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225 | return describe(collection + "/" + service,
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226 | lang, subsetOption, serviceSubsetOptions);
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227 | }
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228 |
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229 | /**
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230 | * For sending a describe message to a Service hosted by the Message Router
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231 | * (no collection).
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232 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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233 | * @param service is the name of the MessageRouter's Service to which this
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234 | * describe request is sent.
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235 | * @param lang is the language of the display content in the response
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236 | * @param subsetOption is the requested list of items to return in the response
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237 | * For Services this can be paramList, displayItemList
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238 | */
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239 | public String describeService(
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240 | String service, String lang, String subsetOption)
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241 | {
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242 | return describe(service, lang, subsetOption, serviceSubsetOptions);
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243 | }
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244 |
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245 | /** For sending a describe message.
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246 | * If public, this method would give full access: a describe message that
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247 | * lets the user specify all the details of who the receiver is, and what
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248 | * details are requested.
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249 | * @param to - the Greenstone module (MessageRouter, Collection,
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250 | * ServiceCluster or (Collection-)Service to send this describe message to.
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251 | * (The module asked to describe itself.)
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252 | * @param lang - the language of the display content in the response.
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253 | * @param subsetOption - the set of elements of the describe response that
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254 | * are requested. These vary depending on the GS3 module asked to describe
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255 | * itself.
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256 | * @param validSubsetOptions - the list of subsetOptions that are allowed
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257 | * for the module this describe message is sent to. Parameter subsetOption
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258 | * has to be among the list of validSubsetOptions.
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259 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 35-41</a>
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260 | */
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261 | protected String describe(String to, String lang,
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262 | String subsetOption, String validSubsetOptions)
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263 | {
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264 | // Create message element: <message></message>
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265 | Element message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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266 | // <message><request lang="en" to="" type="describe" uid="" /></message>
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267 | Element request = GSXML.createBasicRequest(
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268 | this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, new UserContext(lang, ""));
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269 |
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270 | // Check if only a subset of this Module Interface's data is asked
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271 | // to be described
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272 | if(!subsetOption.equals("")) {
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273 | // Now deal with the value for subset param:
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274 | // only deal with valid params for subset of to-ModuleInterface
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275 | if(validSubsetOptions.indexOf(subsetOption) == -1)
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276 | return error("Invalid List to be described. Choose one of:\n"
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277 | + validSubsetOptions);
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278 |
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279 | // else, append <paramList>
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280 | // <param name="subset" value="subsetOption" /></paramList>
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281 | Element paramList = this.doc.createElement(
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282 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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283 | // append <param name="subset" value=paramValue />
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284 | // createParam(Document, name, value);
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285 | // Name needs to be "subset", but this can be either GSXML.SUBSET_PARAM
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286 | // or GSXML.SYSTEM_SUBSET_ATT. It's the first one probably.
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287 | paramList.appendChild(GSXML.createParameter(
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288 | this.doc, GSXML.SUBSET_PARAM, subsetOption));
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289 | request.appendChild(paramList);
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290 | }
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291 | message.appendChild(request);
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292 |
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293 | // Send it off to the Message Router and return the response
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294 | return this.processInternal(message);
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295 | }
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296 |
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297 | /* (2) Process-type message, QUERY-TYPE SERVICES - p.45 */
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298 | /** For executing a (process-type message) query-type service.
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299 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 45</a>
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300 | * @param collection is the name of the Collection whose query service this
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301 | * query-process request is sent to. If "", then the Message Router is assumed.
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302 | * @param service is the name of the Query Service (of that collection) to
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303 | * which this request is sent.
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304 | * @param lang is the language of the display content in the response
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305 | * @param nameToValsMap is a Map of the (fieldname, value) pairs for the
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306 | * parameters of the query. The field names should be those recognised by
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307 | * Greenstone 3. That is, the names must exist for the (Collection-)Service Query that this
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308 | * message is sent To (as given in 'to' argument).
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309 | * For names of Greenstone-accepted arguments,
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310 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Actions_and_Arguments">Greenstone wiki - Actions and Arguments</a>
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311 | */
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312 | public String query(String collection, String service,
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313 | String lang, Map nameToValsMap)
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314 | {
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315 | // <paramList></paramList>
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316 | Element paramList = this.doc.createElement(
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317 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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318 | // <param>s: creating parameters of (name, value) pairs
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319 | Set entrySet = nameToValsMap.entrySet();
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320 | Iterator i = entrySet.iterator();
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321 | while(i.hasNext()) {
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322 | Entry entry = (Entry)i.next();
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323 | String name = (String)entry.getKey();
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324 | String value = (String)entry.getValue();
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325 | paramList.appendChild(GSXML.createParameter(
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326 | this.doc, name, value));
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327 | }
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328 |
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329 | Element message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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330 | Element request = GSXML.createBasicRequest(
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331 | this.doc, GSXML.REQUEST_TYPE_PROCESS,
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332 | collection+"/"+service, new UserContext(lang, ""));
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333 |
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334 | request.appendChild(paramList);
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335 | message.appendChild(request);
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336 |
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337 | // Send it off to the Message Router and return the response
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338 | return this.processInternal(message);
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339 | }
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340 |
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341 | /**
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342 | * This method is used to perform the most basic query:
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343 | * it assumes defaults for all other parameters and provides only
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344 | * the query string. It is built on top of a TextQuery.
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345 | * @param collection is the Greenstone collection to be searched
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346 | * @param lang is the preferred language of the display content in
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347 | * the response to be returned.
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348 | * @param query is the string to be sought in the Greenstone collection
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349 | * @return a Greenstone 3 XML response message for the query specifying
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350 | * the search results.
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351 | */
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352 | public String basicQuery(String collection, String lang, String query) {
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353 | // The basicQuery is built on top of the TextQuery service
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354 | final String queryService = "TextQuery";
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355 |
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356 | // (1) describe request on the TextQuery
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357 | String queryDescription = describeCollectionService(
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358 | collection, queryService, "en", "paramList"); // just get paramList
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359 | //System.out.println(queryDescription);
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360 |
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361 | Document doc = this.converter.getDOM(queryDescription);
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362 | NodeList nl = doc.getElementsByTagName(
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363 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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364 |
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365 | Element paramList = null;
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366 | if(nl.getLength() <= 0) { // no paramList in textQuery description means
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367 | // no query field either: that means we can't continue
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368 | return this.error("BasicQuery is not available for this collection"
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369 | + " as it provides no TextQuery service.");
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370 | } //else
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371 |
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372 | paramList = (Element)nl.item(0);
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373 | nl = paramList.getElementsByTagName(GSXML.PARAM_ELEM);
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374 | if(nl.getLength() <= 0) { // no params, means no query field, so return
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375 | return this.error("BasicQuery is not available for this collection.");
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376 | }
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377 |
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378 | // (2) get the defaults for each parameter and use that to set
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379 | // the defaults
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380 | Map params = new HashMap(nl.getLength()); // field name to value map
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381 | for(int i = 0; i < nl.getLength(); i++) {
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382 | Element param = (Element)nl.item(i);
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383 | String paramName = param.getAttribute(GSXML.NAME_ATT);
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384 | String def = param.getAttribute(GSXML.DEFAULT_ATT);
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385 | if(def.equals("")) {
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386 | // if there's no default, the field must want the query String
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387 | params.put(paramName, query);
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388 | } else { // there is a default, use the default for this param
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389 | params.put(paramName, def);
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390 | }
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391 | }
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392 |
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393 | // (3) Perform the query using defaults and return the response
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394 | return this.query(collection, queryService, lang, params);
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395 | }
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396 |
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397 |
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398 | /* (3) RETRIEVE PROCESS METHODS - Manual, pp.47-49 */
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399 | /** DocumentContentRetrieve request sent to a collection's
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400 | * DocumentContentRetrieve service (see manual, p.48)
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401 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 48</a>
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402 | * @param collection is the name of the Collection whose
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403 | * DocumentContentRetrieve is requested
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404 | * @param lang is the language of the display content in the response
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405 | * @param docNodeIDs is the list of documentNodeIDs for which the
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406 | * content ought to be retrieved. */
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407 | public String retrieveDocumentContent(
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408 | String collection, String lang, String[] docNodeIDs)
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409 | {
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410 | // creating <documentNodeList></documentNodeList>
|
---|
411 | Element docNodeList = this.doc.createElement(
|
---|
412 | GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
|
---|
413 |
|
---|
414 | // creating subelements: <documentNode nodeID="..." />
|
---|
415 | for(int i = 0; i < docNodeIDs.length; i++) {
|
---|
416 | Element docNode = this.doc.createElement(GSXML.DOC_NODE_ELEM);
|
---|
417 | docNode.setAttribute(GSXML.NODE_ID_ATT, docNodeIDs[i]);
|
---|
418 | docNodeList.appendChild(docNode);
|
---|
419 | }
|
---|
420 |
|
---|
421 | Element message = doc.createElement(GSXML.MESSAGE_ELEM);
|
---|
422 | Element request = GSXML.createBasicRequest(
|
---|
423 | doc, GSXML.REQUEST_TYPE_PROCESS,
|
---|
424 | collection+"/DocumentContentRetrieve", new UserContext(lang, ""));
|
---|
425 |
|
---|
426 | // create an empty <paramlist /> element (as example in manual)
|
---|
427 | Element paramlist = doc.createElement(
|
---|
428 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
|
---|
429 |
|
---|
430 | request.appendChild(paramlist);
|
---|
431 | request.appendChild(docNodeList);
|
---|
432 | message.appendChild(request);
|
---|
433 |
|
---|
434 | // Send it off to the Message Router and return the response
|
---|
435 | return this.processInternal(message);
|
---|
436 | }
|
---|
437 |
|
---|
438 | /** DocumentStructureRetrieve request sent to a collection's
|
---|
439 | * DocumentStructureRetrieve service (manual pp.48, 49) to retrieve
|
---|
440 | * the entire document structure.
|
---|
441 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 48, 49</a>
|
---|
442 | * @param collection is the name of the Collection whose
|
---|
443 | * DocumentStructureRetrieve is requested
|
---|
444 | * @param lang is the language of the display content in the response
|
---|
445 | * @param docNodeIDs is the list of documentNodeIDs for which the
|
---|
446 | * entire structure ought to be retrieved. */
|
---|
447 | public String retrieveEntireDocumentStructure(String collection,
|
---|
448 | String lang, String[] docNodeIDs)
|
---|
449 | {
|
---|
450 | return retrieveDocumentStructure(collection, lang, docNodeIDs,
|
---|
451 | new String[] { "entire" }, null);
|
---|
452 | }
|
---|
453 |
|
---|
454 | /** DocumentStructureRetrieve request sent to a collection's
|
---|
455 | * DocumentStructureRetrieve service (manual pp.48, 49) to retrieve
|
---|
456 | * the specified part of the document's structure.
|
---|
457 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 48, 49</a>
|
---|
458 | * @param collection is the name of the Collection whose
|
---|
459 | * DocumentStructureRetrieve is requested
|
---|
460 | * @param lang is the language of the display content in the response
|
---|
461 | * @param docNodeIDs is the list of documentNodeIDs for which the
|
---|
462 | * structure ought to be retrieved.
|
---|
463 | * @param structure specifies what structure information needs to
|
---|
464 | * be retrieved. The values can be one or more of ancestors, parent,
|
---|
465 | * siblings, children, descendants (<b>note spelling</b>), entire.
|
---|
466 | * @param info - for specifying extra information to be retrieved.
|
---|
467 | * Possible values for info parameters are numSiblings, siblingPosition,
|
---|
468 | * numChildren */
|
---|
469 | public String retrieveDocumentStructure(String collection, String lang,
|
---|
470 | String[] docNodeIDs, String[] structure, String[] info)
|
---|
471 | {
|
---|
472 | // creating subelements: <documentNode nodeID="..." />
|
---|
473 | Element docNodeList = this.doc.createElement(
|
---|
474 | GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
|
---|
475 | for(int i = 0; i < docNodeIDs.length; i++) {
|
---|
476 | Element docNode = this.doc.createElement(GSXML.DOC_NODE_ELEM);
|
---|
477 | docNode.setAttribute(GSXML.NODE_ID_ATT, docNodeIDs[i]);
|
---|
478 | docNodeList.appendChild(docNode);
|
---|
479 | }
|
---|
480 |
|
---|
481 | Element message = doc.createElement(GSXML.MESSAGE_ELEM);
|
---|
482 | Element request = GSXML.createBasicRequest(
|
---|
483 | doc, GSXML.REQUEST_TYPE_PROCESS,
|
---|
484 | collection+"/DocumentStructureRetrieve", new UserContext(lang, ""));
|
---|
485 |
|
---|
486 | // Create the <paramlist></paramlist> element of param elements,
|
---|
487 | // if any; and only if values are legal (that is, if they occur in
|
---|
488 | // static Strings structureOptions and structureInfoOptions):
|
---|
489 | // <param name="structure" value = "structure[i]">
|
---|
490 | // <param name="info" value = "info[i]">
|
---|
491 | Element paramList = doc.createElement(
|
---|
492 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
|
---|
493 |
|
---|
494 | if(structure != null) {
|
---|
495 | for(int i = 0; i < structure.length; i++) {
|
---|
496 | if(structureOptions.indexOf(structure[i]) != -1) {
|
---|
497 | paramList.appendChild(GSXML.createParameter(
|
---|
498 | this.doc, "structure", structure[i]));
|
---|
499 | }
|
---|
500 | }
|
---|
501 | }
|
---|
502 | if(info != null) {
|
---|
503 | for(int i = 0; i < info.length; i++) {
|
---|
504 | if(structureInfoOptions.indexOf(info[i]) != -1) {
|
---|
505 | paramList.appendChild(GSXML.createParameter(
|
---|
506 | this.doc, "info", info[i]));
|
---|
507 | }
|
---|
508 | }
|
---|
509 | }
|
---|
510 |
|
---|
511 | // paramList is allowed to be empty and may indeed be empty:
|
---|
512 | request.appendChild(paramList);
|
---|
513 | request.appendChild(docNodeList);
|
---|
514 | message.appendChild(request);
|
---|
515 |
|
---|
516 | // Send it off to the Message Router and return the response
|
---|
517 | return this.processInternal(message);
|
---|
518 | }
|
---|
519 |
|
---|
520 | /* Retrieve for Doc Metadata: explained in the manual on page 47 */
|
---|
521 | /** DocumentMetadataRetrieve request sent to a collection's
|
---|
522 | * DocumentMetadataRetrieve service to retrieve all of a document's metadata.
|
---|
523 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 47</a>
|
---|
524 | * @param collection is the name of the Collection whose
|
---|
525 | * DocumentMetadataRetrieve is requested
|
---|
526 | * @param lang is the language of the display content in the response
|
---|
527 | * @param docNodeIDs is the list of documentNodeIDs for which the
|
---|
528 | * structure ought to be retrieved.
|
---|
529 | */
|
---|
530 | public String retrieveAllDocumentMetadata(String collection, String lang,
|
---|
531 | String[] docNodeIDs)
|
---|
532 | {
|
---|
533 | // See bottom of manual p.44 for the fact that "all" is used
|
---|
534 | // as the metaName value when retrieving all metadata for a doc
|
---|
535 | return retrieveDocumentMetadata(collection, lang, docNodeIDs,
|
---|
536 | new String[]{ "all" });
|
---|
537 | }
|
---|
538 |
|
---|
539 | /** DocumentMetadataRetrieve service to retrieve some specific
|
---|
540 | * metadata values of a document. (Manual on page 47.)
|
---|
541 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 47</a>
|
---|
542 | * @param collection is the name of the Collection whose
|
---|
543 | * DocumentContentRetrieve is requested
|
---|
544 | * @param lang is the language of the display content in the response
|
---|
545 | * @param docNodeIDs is the list of documentNodeIDs for which the
|
---|
546 | * structure ought to be retrieved.
|
---|
547 | * @param metaNames is a list of metadata names which are requested
|
---|
548 | * to be fetched for the specified documents */
|
---|
549 | public String retrieveDocumentMetadata(String collection, String lang,
|
---|
550 | String[] docNodeIDs, String[] metaNames)
|
---|
551 | {
|
---|
552 | return metadataRetrieve(collection+"/DocumentMetadataRetrieve",
|
---|
553 | lang, docNodeIDs, metaNames, GSXML.DOC_NODE_ELEM);
|
---|
554 | }
|
---|
555 |
|
---|
556 | /** Retrieve all classification Metadata for browsing (sent to the
|
---|
557 | * ClassifierBrowseMetadataRetrieve service).
|
---|
558 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 47, 48</a>
|
---|
559 | * @param collection is the name of the Collection whose
|
---|
560 | * ClassifierBrowseMetadataRetrieve service is called
|
---|
561 | * @param categoryName - name of the browsing category, usually
|
---|
562 | * ClassifierBrowse. (If left as "", then it defaults to ClassifierBrowse)
|
---|
563 | * @param lang is the language of the display content in the response
|
---|
564 | * @param nodeIDs is the list of document or classifier NodeIDs
|
---|
565 | * for which the metadata ought to be retrieved.*/
|
---|
566 | public String retrieveAllBrowseMetadata(String collection,
|
---|
567 | String categoryName, String lang, String[] nodeIDs)
|
---|
568 | {
|
---|
569 | if(categoryName.equals(""))
|
---|
570 | categoryName = "ClassifierBrowse";
|
---|
571 | // See bottom of manual p.47 for the fact that "all" is used as
|
---|
572 | // the metaName value when retrieving all metadata for a classifier
|
---|
573 | return metadataRetrieve(collection+"/"+categoryName+"MetadataRetrieve",
|
---|
574 | lang, nodeIDs, new String[]{ "all" }, GSXML.CLASS_NODE_ELEM);
|
---|
575 | }
|
---|
576 |
|
---|
577 | /** ClassifierBrowseMetadataRetrieve service to retrieve some specific
|
---|
578 | * metadata values of a document.
|
---|
579 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - pages 47, 48</a>
|
---|
580 | * @param collection is the name of the Collection whose
|
---|
581 | * ClassifierBrowseMetadataRetrieve service is called
|
---|
582 | * @param categoryName - name of the browsing category, usually
|
---|
583 | * ClassifierBrowse. (If left as "", then it defaults to ClassifierBrowse)
|
---|
584 | * @param lang is the language of the display content in the response
|
---|
585 | * @param nodeIDs is the list of document or classifier NodeIDs
|
---|
586 | * for which the metadata ought to be retrieved.
|
---|
587 | * @param metaNames is a list of metadata names which are requested
|
---|
588 | * to be fetched for the specified documents or classifiers */
|
---|
589 | public String retrieveBrowseMetadata(String collection, String categoryName,
|
---|
590 | String lang, String[] nodeIDs, String[] metaNames)
|
---|
591 | {
|
---|
592 | if(categoryName.equals(""))
|
---|
593 | categoryName = "ClassifierBrowse";
|
---|
594 | return metadataRetrieve(collection+"/"+categoryName+"MetadataRetrieve",
|
---|
595 | lang, nodeIDs, metaNames, GSXML.CLASS_NODE_ELEM);
|
---|
596 | }
|
---|
597 |
|
---|
598 | /** Performs a metadata retrieve for documents and (browse) classification
|
---|
599 | * hierarchies. Sends a Document- or ClassifierBrowse- MetadataRetrieve message
|
---|
600 | * to the Document- or ClassifierBrowse- MetadataRetrieve service.
|
---|
601 | * @param to - the Document- or ClassifierBrowse- MetadataRetrieve service to
|
---|
602 | * send this metadata retrieve message to.
|
---|
603 | * @param lang - the language of the display content in the response
|
---|
604 | * @param nodeIDs - the list of (document or classifier) nodeIDs for which
|
---|
605 | * to retrieve the metadata for
|
---|
606 | * @param metaNames - a list specifiying the names of the metadata items
|
---|
607 | * to be retrieved for each nodeID. E.g. "Title", but a list is allowed.
|
---|
608 | * @param NODE_ELEM - either of GSXML's names for the <documentNode> or
|
---|
609 | * <classifierNode> elements.
|
---|
610 | */
|
---|
611 | protected String metadataRetrieve(String to, String lang,
|
---|
612 | String[] nodeIDs, String[] metaNames, final String NODE_ELEM)
|
---|
613 | {
|
---|
614 | // create the <paramlist></paramlist> element of param elements:
|
---|
615 | // <param name="metadata" value = "metaName[i]">
|
---|
616 | Element metadataParamList = this.doc.createElement(
|
---|
617 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
|
---|
618 | for(int i = 0; i < metaNames.length; i++) {
|
---|
619 | metadataParamList.appendChild(GSXML.createParameter(
|
---|
620 | this.doc, GSXML.METADATA_ELEM, metaNames[i]));
|
---|
621 | }
|
---|
622 |
|
---|
623 | // creating subelements: <documentNode nodeID="..." />
|
---|
624 | // or <classifierNode nodeID="..." />
|
---|
625 | Element nodeList = this.doc.createElement(
|
---|
626 | NODE_ELEM+GSXML.LIST_MODIFIER);
|
---|
627 | for(int i = 0; i < nodeIDs.length; i++) {
|
---|
628 | Element docNode = this.doc.createElement(NODE_ELEM);
|
---|
629 | docNode.setAttribute(GSXML.NODE_ID_ATT, nodeIDs[i]);
|
---|
630 | nodeList.appendChild(docNode);
|
---|
631 | }
|
---|
632 |
|
---|
633 | Element message = doc.createElement(GSXML.MESSAGE_ELEM);
|
---|
634 | Element request = GSXML.createBasicRequest(doc,
|
---|
635 | GSXML.REQUEST_TYPE_PROCESS, to, new UserContext(lang, ""));
|
---|
636 |
|
---|
637 | request.appendChild(metadataParamList);
|
---|
638 | request.appendChild(nodeList);
|
---|
639 | message.appendChild(request);
|
---|
640 |
|
---|
641 | // Send it off to the Message Router and return the response
|
---|
642 | return this.processInternal(message);
|
---|
643 | }
|
---|
644 |
|
---|
645 | /* (4) Classifier BROWSE PROCESS METHODS - p.46 */
|
---|
646 | /** To send a browse request for all the descendants of a classifier node.
|
---|
647 | * Useful for getting the entire structure of a top-level <classificationNode>
|
---|
648 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 46</a>
|
---|
649 | * @param collection is the name of the Collection whose browse Classifier
|
---|
650 | * Browse Service is called
|
---|
651 | * @param browseService is the name of the (Classifier) Browse Service (of
|
---|
652 | * the given collection) to which this request message is sent.
|
---|
653 | * @param lang is the language of the display content in the response
|
---|
654 | * @param classifierNodeIDs is an array of classifierNodeIDs for which the
|
---|
655 | * structures ought to be retrieved.
|
---|
656 | */
|
---|
657 | public String browseDescendants(String collection, String browseService,
|
---|
658 | String lang, String[] classifierNodeIDs)
|
---|
659 | {
|
---|
660 | // We are at the top level, we want all the descendants:
|
---|
661 | // <param name="structure" value = "descendants">
|
---|
662 | // <classifierNodeList><classifier nodeID="CLx" /></classifierNodeList>
|
---|
663 | return browse(collection, browseService, lang,
|
---|
664 | classifierNodeIDs,
|
---|
665 | new String[] {"descendants"}, new String[] {""}); // note the spelling
|
---|
666 | }
|
---|
667 |
|
---|
668 | /** To send a browse request for specific parts of a classifier node
|
---|
669 | * (children, ancestors, descendants). Useful for getting specific parts
|
---|
670 | * of the structure of a top-level <classificationNode>.
|
---|
671 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 46</a>
|
---|
672 | * @param collection is the name of the Collection whose browse Classifier
|
---|
673 | * Browse Service is called
|
---|
674 | * @param browseService is the name of the (Classifier) Browse Service (of
|
---|
675 | * the given collection) to which this request message is sent.
|
---|
676 | * @param lang is the language of the display content in the response
|
---|
677 | * @param classifierNodeIDs is the list of classifierNodeIDs for which the
|
---|
678 | * structure ought to be retrieved.
|
---|
679 | * @param structureParams the list of parameters indicating what structure
|
---|
680 | * information is requested. Accepted values are ancestors, parent, siblings,
|
---|
681 | * children, descendants.
|
---|
682 | * @param infoParams - structural info is requested. Can be numSiblings,
|
---|
683 | * siblingPosition, numChildren
|
---|
684 | */
|
---|
685 | public String browse(String collection, String browseService, String lang,
|
---|
686 | String[] classifierNodeIDs, String[] structureParams, String[] infoParams)
|
---|
687 | {
|
---|
688 | if(browseService.equals(""))
|
---|
689 | browseService = "ClassifierBrowse";
|
---|
690 |
|
---|
691 | // Create message element: <message></message>
|
---|
692 | Element message = this.doc.createElement(GSXML.MESSAGE_ELEM);
|
---|
693 | // <message><request lang="en" to="" type="process" uid="" /></message>
|
---|
694 | Element request = GSXML.createBasicRequest(this.doc,
|
---|
695 | GSXML.REQUEST_TYPE_PROCESS, collection+"/"+browseService, new UserContext(lang, ""));
|
---|
696 |
|
---|
697 | // <param name="structure" value = "structureParams[i]">
|
---|
698 | Element paramList = this.doc.createElement(
|
---|
699 | GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
|
---|
700 | for(int i = 0; i < structureParams.length; i++) {
|
---|
701 | // check it is a valid structure parameter
|
---|
702 | if(structureOptions.indexOf(structureParams[i]) != -1) {
|
---|
703 | paramList.appendChild(GSXML.createParameter(
|
---|
704 | this.doc, "structure", structureParams[i]));
|
---|
705 | }
|
---|
706 | }
|
---|
707 |
|
---|
708 | if(infoParams != null && !infoParams[0].equals("")) {
|
---|
709 | for(int i = 0; i < infoParams.length; i++) {
|
---|
710 | if(structureInfoOptions.indexOf(infoParams[i]) != -1) {
|
---|
711 | paramList.appendChild(GSXML.createParameter(
|
---|
712 | this.doc, "info", infoParams[i]));
|
---|
713 | }
|
---|
714 | }
|
---|
715 | }
|
---|
716 |
|
---|
717 | // <classifierNodeList><classifier nodeID="CLx" />
|
---|
718 | // <classifier nodeID="CLy" /></classifierNodeList>
|
---|
719 | // where CLx and CLy are given in the parameter classifierNodeIDs
|
---|
720 | Element classifierNodeList = this.doc.createElement(
|
---|
721 | GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
|
---|
722 | for(int i = 0; i < classifierNodeIDs.length; i++) {
|
---|
723 | Element classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
|
---|
724 | classifier.setAttribute(GSXML.NODE_ID_ATT, classifierNodeIDs[i]);
|
---|
725 | classifierNodeList.appendChild(classifier);
|
---|
726 | }
|
---|
727 |
|
---|
728 | // now finish constructing the request message:
|
---|
729 | request.appendChild(paramList);
|
---|
730 | request.appendChild(classifierNodeList);
|
---|
731 | message.appendChild(request);
|
---|
732 |
|
---|
733 | // Send it off to the Message Router and return the response
|
---|
734 | return this.processInternal(message);
|
---|
735 | }
|
---|
736 |
|
---|
737 | /** Called by most other methods in order to send the constructed message
|
---|
738 | * to the Greenstone's MessageRouter, intercept the response and return it.
|
---|
739 | * @param message is the XML message Element to send to GS3's MessageRouter.
|
---|
740 | * @return the XML response in String format. */
|
---|
741 | protected String processInternal(Element message) {
|
---|
742 | if(LOG.isDebugEnabled()) { // or LOG.isEnabledFor(Level.DEBUG).
|
---|
743 | // Testing for this improves efficiency
|
---|
744 | LOG.debug(this.converter.getPrettyString(message));
|
---|
745 | }
|
---|
746 |
|
---|
747 | // Let the messagerouter process the request message and get the response
|
---|
748 | Element response = XMLConverter.nodeToElement(mr.process(message));
|
---|
749 | // won't be null except when Node returned is not an element
|
---|
750 | // otherwise, MR always returns some response
|
---|
751 |
|
---|
752 | // Return it as a String formatted for display
|
---|
753 | String responseMsg = this.converter.getPrettyString(response);
|
---|
754 | // this.converter.getString(response);
|
---|
755 |
|
---|
756 | // In order to avoid "Content is not allowed in prolog" exception on the
|
---|
757 | // web services' client end (problem encountered in GS mailing list), need
|
---|
758 | // to make sure no characters (incl spaces) preceed the XML sent back
|
---|
759 | // from here. It may also require the <?xml?> tag at the very start.
|
---|
760 | if(responseMsg.charAt(0) == ' ') {
|
---|
761 | responseMsg = responseMsg.trim();
|
---|
762 | }
|
---|
763 |
|
---|
764 | return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+responseMsg;
|
---|
765 | }
|
---|
766 |
|
---|
767 | /** Creates a String response message to represent an XML error response
|
---|
768 | * message using the error specified in the message parameter. A String is
|
---|
769 | * created because this method ensures that a response message is reliably
|
---|
770 | * constructed (no exceptions are thrown) that can be sent to clients.
|
---|
771 | * @param errorMessage - the errormessage to be conveyed
|
---|
772 | * @return an XML response message containing an GS3 error element. */
|
---|
773 | protected String error(String errorMessage) {
|
---|
774 | StringBuffer buf = new StringBuffer("<" + GSXML.MESSAGE_ELEM + ">");
|
---|
775 | buf.append("<" + GSXML.RESPONSE_ELEM + " "
|
---|
776 | + GSXML.FROM_ATT + "=\"" + "Greenstone 3 Web Services\"" + ">");
|
---|
777 | buf.append("<" + GSXML.ERROR_ELEM + " "
|
---|
778 | + GSXML.ERROR_TYPE_ATT + "=\""+ GSXML.ERROR_TYPE_OTHER + "\"" + ">");
|
---|
779 | buf.append(errorMessage+"\n");
|
---|
780 | buf.append("</" + GSXML.ERROR_ELEM + ">");
|
---|
781 | buf.append("</" + GSXML.RESPONSE_ELEM + ">");
|
---|
782 | buf.append("</" + GSXML.MESSAGE_ELEM + ">");
|
---|
783 | return buf.toString();
|
---|
784 | }
|
---|
785 |
|
---|
786 | /*
|
---|
787 | Look in file QBRWebServicesHelp.properties
|
---|
788 | - Have a properties file that maps methodname to help string specific
|
---|
789 | to the method.
|
---|
790 | - Read it all in statically at the start of the class, into a Properties Map.
|
---|
791 | - When this method is called, display the usage: "help methodname"
|
---|
792 | and list all the available methods by going over the keys in the Map.
|
---|
793 | - When the helpWithMethod(String methodname) method is called, return the
|
---|
794 | value of the Map for the methodname key. This value would be the help
|
---|
795 | description for that method.
|
---|
796 | */
|
---|
797 | /** @return a help string for listing all the web service methods. */
|
---|
798 | public static String help() {
|
---|
799 | if(!helpErrormessage.equals("")) {
|
---|
800 | return helpErrormessage;
|
---|
801 | }
|
---|
802 |
|
---|
803 | StringBuffer helpString = new StringBuffer(
|
---|
804 | "USAGE: helpWithMethod(String <method name>)\n");
|
---|
805 | helpString.append(
|
---|
806 | "\nNearly all the web service operations return a String\n");
|
---|
807 | helpString.append(
|
---|
808 | "representing a Greenstone 3 XML response message.\n");
|
---|
809 | helpString.append("\nA list of all the method names: \n");
|
---|
810 |
|
---|
811 | Enumeration props = properties.keys();
|
---|
812 | while(props.hasMoreElements()){
|
---|
813 | String methodName = (String)props.nextElement();
|
---|
814 | helpString.append("\t");
|
---|
815 | helpString.append(methodName);
|
---|
816 | helpString.append("\n");
|
---|
817 | }
|
---|
818 |
|
---|
819 | return helpString.toString();
|
---|
820 | }
|
---|
821 |
|
---|
822 | /** @param methodname is the name of the method to be described.
|
---|
823 | * @return a help string for the given method, explaining what the method
|
---|
824 | * does, what parameters it expects and their types and what it returns.
|
---|
825 | */
|
---|
826 | public static String helpWithMethod(String methodname) {
|
---|
827 | if(!helpErrormessage.equals("")) {
|
---|
828 | return helpErrormessage;
|
---|
829 | }
|
---|
830 | // else we can get the method's description from the properties
|
---|
831 | // map loaded from the QBRWebServicesHelp.properties file:
|
---|
832 | String helpString = properties.getProperty(methodname,
|
---|
833 | "No description for " + methodname); // if the method does not exist
|
---|
834 |
|
---|
835 | return helpString;
|
---|
836 | }
|
---|
837 | } // end web service class
|
---|