001 //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/ogcwebservices/csw/manager/CSWProfileHarvester.java $
002 /*----------------------------------------------------------------------------
003 This file is part of deegree, http://deegree.org/
004 Copyright (C) 2001-2009 by:
005 Department of Geography, University of Bonn
006 and
007 lat/lon GmbH
008
009 This library is free software; you can redistribute it and/or modify it under
010 the terms of the GNU Lesser General Public License as published by the Free
011 Software Foundation; either version 2.1 of the License, or (at your option)
012 any later version.
013 This library is distributed in the hope that it will be useful, but WITHOUT
014 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016 details.
017 You should have received a copy of the GNU Lesser General Public License
018 along with this library; if not, write to the Free Software Foundation, Inc.,
019 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020
021 Contact information:
022
023 lat/lon GmbH
024 Aennchenstr. 19, 53177 Bonn
025 Germany
026 http://lat-lon.de/
027
028 Department of Geography, University of Bonn
029 Prof. Dr. Klaus Greve
030 Postfach 1147, 53001 Bonn
031 Germany
032 http://www.geographie.uni-bonn.de/deegree/
033
034 e-mail: info@deegree.org
035 ----------------------------------------------------------------------------*/
036 package org.deegree.ogcwebservices.csw.manager;
037
038 import java.io.IOException;
039 import java.net.MalformedURLException;
040 import java.net.URI;
041 import java.net.URL;
042 import java.util.Date;
043 import java.util.Iterator;
044 import java.util.List;
045
046 import org.deegree.framework.log.ILogger;
047 import org.deegree.framework.log.LoggerFactory;
048 import org.deegree.framework.util.FileUtils;
049 import org.deegree.framework.util.StringTools;
050 import org.deegree.framework.xml.XMLFragment;
051 import org.deegree.framework.xml.XMLParsingException;
052 import org.deegree.framework.xml.XMLTools;
053 import org.deegree.ogcwebservices.csw.manager.HarvestRepository.ResourceType;
054 import org.xml.sax.SAXException;
055
056 /**
057 * Harverster implementation for harvesting single metadata documents.
058 *
059 *
060 * @version $Revision: 19475 $
061 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
062 * @author last edited by: $Author: lbuesching $
063 *
064 * @version 1.0. $Revision: 19475 $, $Date: 2009-09-02 14:51:48 +0200 (Mi, 02. Sep 2009) $
065 *
066 * @since 2.0
067 */
068 public class CSWProfileHarvester extends AbstractHarvester {
069
070 static final ILogger LOG = LoggerFactory.getLogger( CSWProfileHarvester.class );
071
072 private static CSWProfileHarvester ch = null;
073
074 /**
075 * @param version
076 * the version of the CSW
077 */
078 private CSWProfileHarvester( String version ) {
079 super( version );
080 }
081
082 /**
083 * singelton
084 *
085 * @param version
086 * the version of the CSW
087 *
088 * @return the instance
089 */
090 public static CSWProfileHarvester getInstance( String version ) {
091 if ( ch == null ) {
092 ch = new CSWProfileHarvester( version );
093 }
094 return ch;
095 }
096
097 @Override
098 public void run() {
099 LOG.logDebug( "starting harvest iteration for CSWProfileHarvester." );
100 try {
101 HarvestRepository repository = HarvestRepository.getInstance();
102
103 List<URI> sources = repository.getSources();
104 for ( Iterator<URI> iter = sources.iterator(); iter.hasNext(); ) {
105 URI source = iter.next();
106 try {
107 // determine if source shall be harvested
108 if ( shallHarvest( source, ResourceType.csw_profile ) ) {
109 HarvestProcessor processor = new HarvestProcessor( this, source );
110 processor.start();
111 }
112 } catch ( Exception e ) {
113 LOG.logError( "Exception harvesting service: " + source, e );
114 informResponseHandlers( source, e );
115 }
116 }
117 } catch ( Exception e ) {
118 LOG.logError( "generell Exception harvesting services", e );
119 }
120
121 }
122
123 /**
124 * inner class for processing asynchronous harvesting of a csw:profile metadata document
125 *
126 * @version $Revision: 19475 $
127 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
128 * @author last edited by: $Author: lbuesching $
129 *
130 * @version 1.0. $Revision: 19475 $, $Date: 2009-09-02 14:51:48 +0200 (Mi, 02. Sep 2009) $
131 *
132 * @since 2.0
133 */
134 protected class HarvestProcessor extends AbstractHarvestProcessor {
135
136 HarvestProcessor( AbstractHarvester owner, URI source ) {
137 super( owner, source );
138 }
139
140 @Override
141 public void run() {
142 try {
143 HarvestRepository repository = HarvestRepository.getInstance();
144 XMLFragment metaData = accessMetadata( source );
145 Date harvestingTimestamp = repository.getNextHarvestingTimestamp( source );
146 String trans = null;
147 // ensure that a resource just will be harvested if something has changed
148 if ( shallHarvest( source, ResourceType.csw_profile ) ) {
149 if ( repository.getLastHarvestingTimestamp( source ) == null ) {
150 trans = createInsertRequest( metaData );
151 } else {
152 trans = createUpdateRequest( getID( metaData ), getIdentifierXPathForUpdate( metaData ),
153 metaData );
154 }
155 performTransaction( trans );
156
157 long ts = repository.getHarvestInterval( source );
158 if ( ts <= 0 ) {
159 // if the harvest interval is less or equal to 0 the source
160 // shall just be harvested for one time and it will be
161 // removed from harvest cache db
162 informResponseHandlers( source );
163 repository.dropRequest( source );
164 } else {
165 // update timestamps just if transaction has been performed
166 // successfully
167 writeLastHarvestingTimestamp( source, harvestingTimestamp );
168 writeNextHarvestingTimestamp( source, harvestingTimestamp );
169 informResponseHandlers( source );
170 }
171 }
172
173 } catch ( Exception e ) {
174 e.printStackTrace();
175 LOG.logError( "could not perform harvest operation for source: " + source, e );
176 try {
177 owner.informResponseHandlers( source, e );
178 } catch ( Exception ee ) {
179 ee.printStackTrace();
180 }
181 }
182 }
183
184 /**
185 * returns the identifier of a metadata record to enable its update
186 *
187 * @param metaData
188 * @return the identifier of a metadata record to enable its update
189 * @throws XMLParsingException
190 */
191 private String getID( XMLFragment metaData )
192 throws XMLParsingException {
193 String xpath = getIdentifierXPath( metaData );
194 String fileIdentifier = XMLTools.getRequiredNodeAsString( metaData.getRootElement(), xpath, nsc );
195 return fileIdentifier;
196 }
197
198 @Override
199 protected String createConstraint( String identifier, String xPath )
200 throws IOException {
201 // read template from file
202 URL url = Templates.getTemplate( "Constraints_" + version );
203
204 String constraints = FileUtils.readTextFile( url ).toString();
205 constraints = StringTools.replace( constraints, "$identifier$", identifier, false );
206 return StringTools.replace( constraints, "$xPath$", xPath, false );
207 }
208
209 /**
210 *
211 * @param source
212 * @return the document
213 * @throws SAXException
214 * @throws IOException
215 * @throws MalformedURLException
216 */
217 private XMLFragment accessMetadata( URI source )
218 throws MalformedURLException, IOException, SAXException {
219
220 XMLFragment xml = new XMLFragment();
221 xml.load( source.toURL() );
222 return xml;
223 }
224
225 }
226
227 }