Source Code Cross Referenced for Harvester.java in  » GIS » geonetwork » org » fao » geonet » kernel » harvest » harvester » webdav » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » geonetwork » org.fao.geonet.kernel.harvest.harvester.webdav 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //=============================================================================
002:        //===	Copyright (C) 2001-2007 Food and Agriculture Organization of the
003:        //===	United Nations (FAO-UN), United Nations World Food Programme (WFP)
004:        //===	and United Nations Environment Programme (UNEP)
005:        //===
006:        //===	This program is free software; you can redistribute it and/or modify
007:        //===	it under the terms of the GNU General Public License as published by
008:        //===	the Free Software Foundation; either version 2 of the License, or (at
009:        //===	your option) any later version.
010:        //===
011:        //===	This program is distributed in the hope that it will be useful, but
012:        //===	WITHOUT ANY WARRANTY; without even the implied warranty of
013:        //===	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:        //===	General Public License for more details.
015:        //===
016:        //===	You should have received a copy of the GNU General Public License
017:        //===	along with this program; if not, write to the Free Software
018:        //===	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
019:        //===
020:        //===	Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
021:        //===	Rome - Italy. email: geonetwork@osgeo.org
022:        //==============================================================================
023:
024:        package org.fao.geonet.kernel.harvest.harvester.webdav;
025:
026:        import java.io.IOException;
027:        import java.util.List;
028:        import java.util.UUID;
029:        import jeeves.interfaces.Logger;
030:        import jeeves.resources.dbms.Dbms;
031:        import jeeves.server.context.ServiceContext;
032:        import jeeves.utils.Xml;
033:        import org.fao.geonet.GeonetContext;
034:        import org.fao.geonet.constants.Geonet;
035:        import org.fao.geonet.kernel.DataManager;
036:        import org.fao.geonet.kernel.harvest.harvester.CategoryMapper;
037:        import org.fao.geonet.kernel.harvest.harvester.GroupMapper;
038:        import org.fao.geonet.kernel.harvest.harvester.Privileges;
039:        import org.fao.geonet.kernel.harvest.harvester.UriMapper;
040:        import org.jdom.Element;
041:        import org.jdom.JDOMException;
042:
043:        //=============================================================================
044:
045:        class Harvester {
046:            //--------------------------------------------------------------------------
047:            //---
048:            //--- Constructor
049:            //---
050:            //--------------------------------------------------------------------------
051:
052:            public Harvester(Logger log, ServiceContext context, Dbms dbms,
053:                    WebDavParams params) {
054:                this .log = log;
055:                this .context = context;
056:                this .dbms = dbms;
057:                this .params = params;
058:
059:                result = new WebDavResult();
060:
061:                GeonetContext gc = (GeonetContext) context
062:                        .getHandlerContext(Geonet.CONTEXT_NAME);
063:                dataMan = gc.getDataManager();
064:            }
065:
066:            //---------------------------------------------------------------------------
067:            //---
068:            //--- API methods
069:            //---
070:            //---------------------------------------------------------------------------
071:
072:            public WebDavResult harvest() throws Exception {
073:                log.info("Retrieving remote metadata information for : "
074:                        + params.name);
075:
076:                RemoteRetriever rr = new WebDavRetriever();
077:                rr.init(log, context, params);
078:                List<RemoteFile> files = rr.retrieve();
079:
080:                log.info("Remote files found : " + files.size());
081:
082:                align(files);
083:                rr.destroy();
084:
085:                return result;
086:            }
087:
088:            //---------------------------------------------------------------------------
089:            //---
090:            //--- Private methods
091:            //---
092:            //---------------------------------------------------------------------------
093:
094:            private void align(List<RemoteFile> files) throws Exception {
095:                log.info("Start of alignment for : " + params.name);
096:
097:                //-----------------------------------------------------------------------
098:                //--- retrieve all local categories and groups
099:                //--- retrieve harvested uuids for given harvesting node
100:
101:                localCateg = new CategoryMapper(dbms);
102:                localGroups = new GroupMapper(dbms);
103:                localUris = new UriMapper(dbms, params.uuid);
104:                dbms.commit();
105:
106:                //-----------------------------------------------------------------------
107:                //--- remove old metadata
108:
109:                for (String uri : localUris.getUris())
110:                    if (!exists(files, uri)) {
111:                        String id = localUris.getID(uri);
112:
113:                        log.debug("  - Removing old metadata with local id:"
114:                                + id);
115:                        dataMan.deleteMetadata(dbms, id);
116:                        dbms.commit();
117:                        result.locallyRemoved++;
118:                    }
119:
120:                //-----------------------------------------------------------------------
121:                //--- insert/update new metadata
122:
123:                for (RemoteFile rf : files) {
124:                    result.total++;
125:
126:                    String id = localUris.getID(rf.getPath());
127:
128:                    if (id == null)
129:                        addMetadata(rf);
130:                    else
131:                        updateMetadata(rf, id);
132:                }
133:
134:                log.info("End of alignment for : " + params.name);
135:            }
136:
137:            //--------------------------------------------------------------------------
138:            /** Return true if the uri is present in the remote folder */
139:
140:            private boolean exists(List<RemoteFile> files, String uri) {
141:                for (RemoteFile rf : files)
142:                    if (uri.equals(rf.getPath()))
143:                        return true;
144:
145:                return false;
146:            }
147:
148:            //--------------------------------------------------------------------------
149:            //---
150:            //--- Private methods : addMetadata
151:            //---
152:            //--------------------------------------------------------------------------
153:
154:            private void addMetadata(RemoteFile rf) throws Exception {
155:                Element md = retrieveMetadata(rf);
156:
157:                if (md == null)
158:                    return;
159:
160:                //--- schema handled check already done
161:
162:                String schema = dataMan.autodetectSchema(md);
163:                String uuid = UUID.randomUUID().toString();
164:
165:                log.debug("  - Setting uuid for metadata with remote path : "
166:                        + rf.getPath());
167:
168:                //--- set uuid inside metadata and get new xml
169:                md = dataMan.setUUID(schema, uuid, md);
170:
171:                log.debug("  - Adding metadata with remote path : "
172:                        + rf.getPath());
173:
174:                String id = dataMan.insertMetadataExt(dbms, schema, md, context
175:                        .getSerialFactory(), params.uuid, rf.getChangeDate(),
176:                        rf.getChangeDate(), uuid, 1, null);
177:
178:                int iId = Integer.parseInt(id);
179:
180:                dataMan.setTemplate(dbms, iId, "n", null);
181:                dataMan.setHarvested(dbms, iId, params.uuid, rf.getPath());
182:
183:                addPrivileges(id);
184:                addCategories(id);
185:
186:                dbms.commit();
187:                dataMan.indexMetadata(dbms, id);
188:                result.added++;
189:            }
190:
191:            //--------------------------------------------------------------------------
192:
193:            private Element retrieveMetadata(RemoteFile rf) {
194:                try {
195:                    log.debug("Getting remote file : " + rf.getPath());
196:                    Element md = rf.getMetadata();
197:                    log.debug("Record got:\n" + Xml.getString(md));
198:
199:                    String schema = dataMan.autodetectSchema(md);
200:
201:                    if (schema == null) {
202:                        log
203:                                .warning("Skipping metadata with unknown schema. Path is : "
204:                                        + rf.getPath());
205:                        result.unknownSchema++;
206:                    } else {
207:                        if (!params.validate || validates(schema, md))
208:                            return (Element) md.detach();
209:
210:                        log
211:                                .warning("Skipping metadata that does not validate. Path is : "
212:                                        + rf.getPath());
213:                        result.doesNotValidate++;
214:                    }
215:                }
216:
217:                catch (JDOMException e) {
218:                    log
219:                            .warning("Skipping metadata with bad XML format. Path is : "
220:                                    + rf.getPath());
221:                    result.badFormat++;
222:                }
223:
224:                catch (Exception e) {
225:                    log
226:                            .warning("Raised exception while getting metadata file : "
227:                                    + e);
228:                    result.unretrievable++;
229:                }
230:
231:                //--- we don't raise any exception here. Just try to go on
232:                return null;
233:            }
234:
235:            //--------------------------------------------------------------------------
236:
237:            private boolean validates(String schema, Element md) {
238:                try {
239:                    dataMan.validate(schema, md);
240:                    return true;
241:                } catch (Exception e) {
242:                    return false;
243:                }
244:            }
245:
246:            //--------------------------------------------------------------------------
247:            //--- Categories
248:            //--------------------------------------------------------------------------
249:
250:            private void addCategories(String id) throws Exception {
251:                for (String catId : params.getCategories()) {
252:                    String name = localCateg.getName(catId);
253:
254:                    if (name == null)
255:                        log.debug("    - Skipping removed category with id:"
256:                                + catId);
257:                    else {
258:                        log.debug("    - Setting category : " + name);
259:                        dataMan.setCategory(dbms, id, catId);
260:                    }
261:                }
262:            }
263:
264:            //--------------------------------------------------------------------------
265:            //--- Privileges
266:            //--------------------------------------------------------------------------
267:
268:            private void addPrivileges(String id) throws Exception {
269:                for (Privileges priv : params.getPrivileges()) {
270:                    String name = localGroups.getName(priv.getGroupId());
271:
272:                    if (name == null)
273:                        log.debug("    - Skipping removed group with id:"
274:                                + priv.getGroupId());
275:                    else {
276:                        log.debug("    - Setting privileges for group : "
277:                                + name);
278:
279:                        for (int opId : priv.getOperations()) {
280:                            name = dataMan.getAccessManager().getPrivilegeName(
281:                                    opId);
282:
283:                            //--- allow only: view, dynamic, featured
284:                            if (opId == 0 || opId == 5 || opId == 6) {
285:                                log.debug("       --> " + name);
286:                                dataMan.setOperation(dbms, id, priv
287:                                        .getGroupId(), opId + "");
288:                            } else
289:                                log.debug("       --> " + name + " (skipped)");
290:                        }
291:                    }
292:                }
293:            }
294:
295:            //--------------------------------------------------------------------------
296:            //---
297:            //--- Private methods : updateMetadata
298:            //---
299:            //--------------------------------------------------------------------------
300:
301:            private void updateMetadata(RemoteFile rf, String id)
302:                    throws Exception {
303:                String date = localUris.getChangeDate(rf.getPath());
304:
305:                if (!rf.isMoreRecentThan(date)) {
306:                    log.debug("  - Metadata XML not changed for path : "
307:                            + rf.getPath());
308:                    result.unchanged++;
309:                } else {
310:                    log.debug("  - Updating local metadata for path : "
311:                            + rf.getPath());
312:
313:                    Element md = retrieveMetadata(rf);
314:
315:                    if (md == null)
316:                        return;
317:
318:                    dataMan.updateMetadataExt(dbms, id, md, rf.getChangeDate());
319:
320:                    //--- the administrator could change privileges and categories using the
321:                    //--- web interface so we have to re-set both
322:
323:                    dbms.execute(
324:                            "DELETE FROM OperationAllowed WHERE metadataId=?",
325:                            Integer.parseInt(id));
326:                    addPrivileges(id);
327:
328:                    dbms.execute(
329:                            "DELETE FROM MetadataCateg WHERE metadataId=?",
330:                            Integer.parseInt(id));
331:                    addCategories(id);
332:
333:                    dbms.commit();
334:                    dataMan.indexMetadata(dbms, id);
335:                    result.updated++;
336:                }
337:            }
338:
339:            //---------------------------------------------------------------------------
340:            //---
341:            //--- Variables
342:            //---
343:            //---------------------------------------------------------------------------
344:
345:            private Logger log;
346:            private ServiceContext context;
347:            private Dbms dbms;
348:            private WebDavParams params;
349:            private DataManager dataMan;
350:            private CategoryMapper localCateg;
351:            private GroupMapper localGroups;
352:            private UriMapper localUris;
353:            private WebDavResult result;
354:        }
355:
356:        //=============================================================================
357:
358:        interface RemoteRetriever {
359:            public void init(Logger log, ServiceContext context,
360:                    WebDavParams params);
361:
362:            public List<RemoteFile> retrieve() throws Exception;
363:
364:            public void destroy();
365:        }
366:
367:        //=============================================================================
368:
369:        interface RemoteFile {
370:            public String getPath();
371:
372:            public String getChangeDate();
373:
374:            public Element getMetadata() throws JDOMException, IOException,
375:                    Exception;
376:
377:            public boolean isMoreRecentThan(String localDate);
378:        }
379:
380:        //=============================================================================
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