[15298] | 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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[15481] | 40 | import org.w3c.dom.NodeList;
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[16760] | 41 | import org.w3c.dom.Node;
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[15298] | 42 |
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[22295] | 43 | import org.greenstone.util.GlobalProperties;
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[15298] | 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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[26123] | 47 | import org.greenstone.gsdl3.util.UserContext;
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[15298] | 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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[22295] | 138 | protected static final String structureOptions =
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[15298] | 139 | "entire ancestors parent siblings children descendants"; // note the spelling
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[22224] | 140 | protected static final String structureInfoOptions =
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[15298] | 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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[26123] | 268 | this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, new UserContext(lang, ""));
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[15298] | 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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[15481] | 328 |
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| 329 | Element message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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[15298] | 330 | Element request = GSXML.createBasicRequest(
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[15481] | 331 | this.doc, GSXML.REQUEST_TYPE_PROCESS,
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[26123] | 332 | collection+"/"+service, new UserContext(lang, ""));
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[15298] | 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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[15481] | 338 | return this.processInternal(message);
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[15298] | 339 | }
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[15481] | 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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[15298] | 355 |
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[15481] | 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
|
---|
| 387 | params.put(paramName, query);
|
---|
| 388 | } else { // there is a default, use the default for this param
|
---|
| 389 | params.put(paramName, def);
|
---|
| 390 | }
|
---|
| 391 | }
|
---|
| 392 |
|
---|
| 393 | // (3) Perform the query using defaults and return the response
|
---|
| 394 | return this.query(collection, queryService, lang, params);
|
---|
| 395 | }
|
---|
| 396 |
|
---|
| 397 |
|
---|
[15298] | 398 | /* (3) RETRIEVE PROCESS METHODS - Manual, pp.47-49 */
|
---|
| 399 | /** DocumentContentRetrieve request sent to a collection's
|
---|
| 400 | * DocumentContentRetrieve service (see manual, p.48)
|
---|
| 401 | * @see <a href="http://wiki.greenstone.org/wiki/index.php/Greenstone3">The Greenstone 3 Developer's Manual - page 48</a>
|
---|
| 402 | * @param collection is the name of the Collection whose
|
---|
| 403 | * DocumentContentRetrieve is requested
|
---|
| 404 | * @param lang is the language of the display content in the response
|
---|
| 405 | * @param docNodeIDs is the list of documentNodeIDs for which the
|
---|
| 406 | * content ought to be retrieved. */
|
---|
| 407 | public String retrieveDocumentContent(
|
---|
| 408 | String collection, String lang, String[] docNodeIDs)
|
---|
| 409 | {
|
---|
| 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,
|
---|
[26123] | 424 | collection+"/DocumentContentRetrieve", new UserContext(lang, ""));
|
---|
[15298] | 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,
|
---|
[26123] | 484 | collection+"/DocumentStructureRetrieve", new UserContext(lang, ""));
|
---|
[15298] | 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
|
---|
[22295] | 488 | // static Strings structureOptions and structureInfoOptions):
|
---|
[15298] | 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++) {
|
---|
[22295] | 496 | if(structureOptions.indexOf(structure[i]) != -1) {
|
---|
[15298] | 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++) {
|
---|
[22224] | 504 | if(structureInfoOptions.indexOf(info[i]) != -1) {
|
---|
[15298] | 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,
|
---|
[26123] | 635 | GSXML.REQUEST_TYPE_PROCESS, to, new UserContext(lang, ""));
|
---|
[15298] | 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,
|
---|
[22224] | 665 | new String[] {"descendants"}, new String[] {""}); // note the spelling
|
---|
[15298] | 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.
|
---|
[22224] | 682 | * @param infoParams - structural info is requested. Can be numSiblings,
|
---|
| 683 | * siblingPosition, numChildren
|
---|
[15298] | 684 | */
|
---|
| 685 | public String browse(String collection, String browseService, String lang,
|
---|
[22224] | 686 | String[] classifierNodeIDs, String[] structureParams, String[] infoParams)
|
---|
[15298] | 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,
|
---|
[26123] | 695 | GSXML.REQUEST_TYPE_PROCESS, collection+"/"+browseService, new UserContext(lang, ""));
|
---|
[15298] | 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
|
---|
[22295] | 702 | if(structureOptions.indexOf(structureParams[i]) != -1) {
|
---|
[15298] | 703 | paramList.appendChild(GSXML.createParameter(
|
---|
| 704 | this.doc, "structure", structureParams[i]));
|
---|
| 705 | }
|
---|
| 706 | }
|
---|
[22224] | 707 |
|
---|
[22295] | 708 | if(infoParams != null && !infoParams[0].equals("")) {
|
---|
[22224] | 709 | for(int i = 0; i < infoParams.length; i++) {
|
---|
| 710 | if(structureInfoOptions.indexOf(infoParams[i]) != -1) {
|
---|
| 711 | paramList.appendChild(GSXML.createParameter(
|
---|
[22295] | 712 | this.doc, "info", infoParams[i]));
|
---|
[22224] | 713 | }
|
---|
| 714 | }
|
---|
| 715 | }
|
---|
[15298] | 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) {
|
---|
[16103] | 742 | if(LOG.isDebugEnabled()) { // or LOG.isEnabledFor(Level.DEBUG).
|
---|
| 743 | // Testing for this improves efficiency
|
---|
| 744 | LOG.debug(this.converter.getPrettyString(message));
|
---|
| 745 | }
|
---|
[15298] | 746 |
|
---|
| 747 | // Let the messagerouter process the request message and get the response
|
---|
[16784] | 748 | Element response = XMLConverter.nodeToElement(mr.process(message));
|
---|
[16758] | 749 | // won't be null except when Node returned is not an element
|
---|
| 750 | // otherwise, MR always returns some response
|
---|
[16105] | 751 |
|
---|
| 752 | // Return it as a String formatted for display
|
---|
| 753 | String responseMsg = this.converter.getPrettyString(response);
|
---|
| 754 | // this.converter.getString(response);
|
---|
| 755 |
|
---|
[16103] | 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.
|
---|
[16105] | 760 | if(responseMsg.charAt(0) == ' ') {
|
---|
| 761 | responseMsg = responseMsg.trim();
|
---|
| 762 | }
|
---|
| 763 |
|
---|
[16763] | 764 | return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+responseMsg;
|
---|
[15298] | 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
|
---|