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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
77
111 public class MODSDisseminationCrosswalk extends SelfNamedPlugin
112 implements DisseminationCrosswalk
113 {
114
115 private static Logger log = Logger.getLogger(MODSDisseminationCrosswalk.class);
116
117 private final static String CONFIG_PREFIX = "crosswalk.mods.properties.";
118
119
123 private static String aliases[] = null;
124 static
125 {
126 List aliasList = new ArrayList ();
127 Enumeration pe = ConfigurationManager.propertyNames();
128 while (pe.hasMoreElements())
129 {
130 String key = (String )pe.nextElement();
131 if (key.startsWith(CONFIG_PREFIX))
132 aliasList.add(key.substring(CONFIG_PREFIX.length()));
133 }
134 aliases = (String [])aliasList.toArray(new String [aliasList.size()]);
135 }
136
137 public static String [] getPluginNames()
138 {
139 return aliases;
140 }
141
142
145 public static final Namespace MODS_NS =
146 Namespace.getNamespace("mods", "http://www.loc.gov/mods/v3");
147
148 private static final Namespace XLINK_NS =
149 Namespace.getNamespace("xlink", "http://www.w3.org/1999/xlink");
150
151 private static final Namespace namespaces[] = { MODS_NS, XLINK_NS };
152
153
154 public static final String MODS_XSD =
155 "http://www.loc.gov/standards/mods/v3/mods-3-1.xsd";
156
157 private static final String schemaLocation =
158 MODS_NS.getURI()+" "+MODS_XSD;
159
160 private static XMLOutputter outputUgly = new XMLOutputter();
161 private static XMLOutputter outputPretty = new XMLOutputter(Format.getPrettyFormat());
162 private static SAXBuilder builder = new SAXBuilder();
163
164 private HashMap modsMap = null;
165
166
172 static class modsTriple
173 {
174 public String qdc = null;
175 public Element xml = null;
176 public XPath xpath = null;
177
178
183 public static modsTriple create(String qdc, String xml, String xpath)
184 {
185 modsTriple result = new modsTriple();
186
187 final String prolog = "<mods xmlns:"+MODS_NS.getPrefix()+"=\""+MODS_NS.getURI()+"\" "+
188 "xmlns:"+XLINK_NS.getPrefix()+"=\""+XLINK_NS.getURI()+"\">";
189 final String postlog = "</mods>";
190 try
191 {
192 result.qdc = qdc;
193 result.xpath = XPath.newInstance(xpath);
194 result.xpath.addNamespace(MODS_NS.getPrefix(), MODS_NS.getURI());
195 result.xpath.addNamespace(XLINK_NS);
196 Document d = builder.build(new StringReader (prolog+xml+postlog));
197 result.xml = (Element)d.getRootElement().getContent(0);
198 }
199 catch (JDOMException je)
200 {
201 log.error("Error initializing modsTriple(\""+qdc+"\",\""+xml+"\",\""+xpath+"\"): got "+je.toString());
202 return null;
203 }
204 catch (IOException je)
205 {
206 log.error("Error initializing modsTriple(\""+qdc+"\",\""+xml+"\",\""+xpath+"\"): got "+je.toString());
207 return null;
208 }
209 return result;
210 }
211 }
212
213
240 private void initMap()
241 throws CrosswalkInternalException
242 {
243 if (modsMap != null)
244 return;
245 String myAlias = getPluginInstanceName();
246 if (myAlias == null)
247 {
248 log.error("Must use PluginManager to instantiate MODSDisseminationCrosswalk so the class knows its name.");
249 return;
250 }
251 String cmPropName = CONFIG_PREFIX+myAlias;
252 String propsFilename = ConfigurationManager.getProperty(cmPropName);
253 if (propsFilename == null)
254 {
255 String msg = "MODS crosswalk missing "+
256 "configuration file for crosswalk named \""+myAlias+"\"";
257 log.error(msg);
258 throw new CrosswalkInternalException(msg);
259 }
260 else
261 {
262 String parent = ConfigurationManager.getProperty("dspace.dir") +
263 File.separator + "config" + File.separator;
264 File propsFile = new File (parent, propsFilename);
265 Properties modsConfig = new Properties ();
266 try
267 {
268 modsConfig.load(new FileInputStream (propsFile));
269 }
270 catch (IOException e)
271 {
272 log.error("Error opening or reading MODS properties file: "+propsFile.toString()+": "+e.toString());
273 throw new CrosswalkInternalException("MODS crosswalk cannot "+
274 "open config file: "+e.toString());
275 }
276 modsMap = new HashMap ();
277 Enumeration pe = modsConfig.propertyNames();
278 while (pe.hasMoreElements())
279 {
280 String qdc = (String )pe.nextElement();
281 String val = modsConfig.getProperty(qdc);
282 String pair[] = val.split("\\s+\\|\\s+", 2);
283 if (pair.length < 2)
284 log.warn("Illegal MODS mapping in "+propsFile.toString()+", line = "+
285 qdc + " = " + val);
286 else
287 {
288 modsTriple trip = modsTriple.create(qdc, pair[0], pair[1]);
289 if (trip != null)
290 modsMap.put(qdc, trip);
291 }
292 }
293 }
294 }
295
296 public Namespace[] getNamespaces()
297 {
298 return namespaces;
299 }
300
301 public String getSchemaLocation()
302 {
303 return schemaLocation;
304 }
305
306
309 public List disseminateList(DSpaceObject dso)
310 throws CrosswalkException,
311 IOException , SQLException , AuthorizeException
312 {
313 return disseminateListInternal(dso, true);
314 }
315
316 public Element disseminateElement(DSpaceObject dso)
317 throws CrosswalkException,
318 IOException , SQLException , AuthorizeException
319 {
320 Element root = new Element("mods", MODS_NS);
321 root.setAttribute("schemaLocation", schemaLocation, XSI_NS);
322 root.addContent(disseminateListInternal(dso,false));
323 return root;
324 }
325
326 private List disseminateListInternal(DSpaceObject dso, boolean addSchema)
327 throws CrosswalkException,
328 IOException , SQLException , AuthorizeException
329 {
330 if (dso.getType() != Constants.ITEM)
331 throw new CrosswalkObjectNotSupported("MODSDisseminationCrosswalk can only crosswalk an Item.");
332 Item item = (Item)dso;
333 initMap();
334
335 DCValue[] dc = item.getMetadata(Item.ANY, Item.ANY, Item.ANY, Item.ANY);
336 List result = new ArrayList (dc.length);
337 for (int i = 0; i < dc.length; i++)
338 {
339 String qdc = dc[i].schema+"."+
342 ((dc[i].qualifier == null) ? dc[i].element
343 : (dc[i].element + "." + dc[i].qualifier));
344
345 modsTriple trip = (modsTriple)modsMap.get(qdc);
346 if (trip == null)
347 log.warn("WARNING: "+getPluginInstanceName()+": No MODS mapping for \"" + qdc+"\"");
348 else
349 {
350 try
351 {
352 Element me = (Element)trip.xml.clone();
353 if (addSchema)
354 me.setAttribute("schemaLocation", schemaLocation, XSI_NS);
355 Iterator ni = trip.xpath.selectNodes(me).iterator();
356 if (!ni.hasNext())
357 log.warn("XPath \""+trip.xpath.getXPath()+
358 "\" found no elements in \""+
359 outputUgly.outputString(me)+
360 "\", qdc="+qdc);
361 while (ni.hasNext())
362 {
363 Object what = ni.next();
364 if (what instanceof Element)
365 ((Element)what).setText(dc[i].value);
366 else if (what instanceof Attribute)
367 ((Attribute)what).setValue(dc[i].value);
368 else if (what instanceof Text)
369 ((Text)what).setText(dc[i].value);
370 else
371 log.warn("Got unknown object from XPath, class="+what.getClass().getName());
372 }
373 result.add(me);
374 }
375 catch (JDOMException je)
376 {
377 log.error("Error following XPath in modsTriple: context="+
378 outputUgly.outputString(trip.xml)+
379 ", xpath="+trip.xpath.getXPath()+", exception="+
380 je.toString());
381 }
382 }
383 }
384 return result;
385 }
386
387 public boolean canDisseminate(DSpaceObject dso)
388 {
389 return true;
390 }
391
392 public boolean preferList()
393 {
394 return false;
395 }
396 }
397 |
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