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40
41 package org.dspace.content.crosswalk;
42
43 import java.io.InputStream  ;
44 import java.io.IOException ;
45 import java.sql.SQLException ;
46 import java.util.Iterator ;
47 import java.util.List ;
48 import java.util.ArrayList ;
49 import java.util.HashMap ;
50 import java.util.Properties ;
51 import java.util.Enumeration ;
52 import java.io.OutputStream ;
53 import java.io.StringReader ;
54 import java.io.File ;
55 import java.io.FileInputStream ;
56
57 import java.sql.SQLException ;
58 import org.apache.log4j.Logger;
59
60 import org.dspace.core.Context;
61 import org.dspace.core.Constants;
62 import org.dspace.content.Item;
63 import org.dspace.content.DCDate;
64 import org.dspace.content.DCValue;
65 import org.dspace.content.DSpaceObject;
66 import org.dspace.authorize.AuthorizeException;
67 import org.dspace.core.ConfigurationManager;
68 import org.dspace.core.SelfNamedPlugin;
69
70 import org.jdom.*;
71 import org.jdom.output.XMLOutputter;
72 import org.jdom.output.Format;
73 import org.jdom.input.SAXBuilder;
74 import org.jdom.input.JDOMParseException;
75 import org.jdom.xpath.XPath;
76 import org.jdom.transform.XSLTransformer;
77 import org.jdom.transform.XSLTransformException;
78
79
138 public abstract class XSLTCrosswalk extends SelfNamedPlugin
139 {
140
141 private static Logger log = Logger.getLogger(XSLTCrosswalk.class);
142
143
146 public static final Namespace DIM_NS =
147 Namespace.getNamespace("dim", "http://www.dspace.org/xmlns/dspace/dim");
148
149
150 protected final static String CONFIG_PREFIX = "crosswalk.";
151
152 private final static String CONFIG_STYLESHEET = ".stylesheet";
153
154
160 protected static String [] makeAliases(String direction)
161 {
162 String prefix = CONFIG_PREFIX+direction+".";
163 String suffix = CONFIG_STYLESHEET;
164
165 List aliasList = new ArrayList ();
166 Enumeration pe = ConfigurationManager.propertyNames();
167
168 log.debug("XSLTCrosswalk: Looking for config prefix = "+prefix);
169 while (pe.hasMoreElements())
170 {
171 String key = (String )pe.nextElement();
172 if (key.startsWith(prefix) && key.endsWith(suffix))
173 {
174 log.debug("Getting XSLT plugin name from config line: "+key);
175 aliasList.add(key.substring(prefix.length(), key.length()-suffix.length()));
176 }
177 }
178 return (String [])aliasList.toArray(new String [aliasList.size()]);
179 }
180
181 private XSLTransformer transformer = null;
182 private File transformerFile = null;
183 private long transformerLastModified = 0;
184
185
191 protected XSLTransformer getTransformer(String direction)
192 {
193 if (transformerFile == null)
194 {
195 String myAlias = getPluginInstanceName();
196 if (myAlias == null)
197 {
198 log.error("Must use PluginManager to instantiate XSLTCrosswalk so the class knows its name.");
199 return null;
200 }
201 String cmPropName = CONFIG_PREFIX+direction+"."+myAlias+CONFIG_STYLESHEET;
202 String fname = ConfigurationManager.getProperty(cmPropName);
203 if (fname == null)
204 {
205 log.error("Missing configuration filename for XSLT-based crosswalk: no "+
206 "value for property = "+cmPropName);
207 return null;
208 }
209 else
210 {
211 String parent = ConfigurationManager.getProperty("dspace.dir") +
212 File.separator + "config" + File.separator;
213 transformerFile = new File (parent, fname);
214 }
215 }
216
217 if (transformer == null ||
219 transformerFile.lastModified() > transformerLastModified)
220 {
221 try
222 {
223 log.debug((transformer == null ? "Loading " : "Reloading")+
224 getPluginInstanceName()+" XSLT stylesheet from "+transformerFile.toString());
225 transformer = new XSLTransformer(transformerFile);
226 transformerLastModified = transformerFile.lastModified();
227 }
228 catch (XSLTransformException e)
229 {
230 log.error("Failed to initialize XSLTCrosswalk("+getPluginInstanceName()+"):"+e.toString());
231 }
232 }
233 return transformer;
234 }
235 }
236 |
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