//=============================================================================
//=== Copyright (C) 2001-2007 Food and Agriculture Organization of the
//=== United Nations (FAO-UN), United Nations World Food Programme (WFP)
//=== and United Nations Environment Programme (UNEP)
//===
//=== This program is free software; you can redistribute it and/or modify
//=== it under the terms of the GNU General Public License as published by
//=== the Free Software Foundation; either version 2 of the License, or (at
//=== your option) any later version.
//===
//=== This program is distributed in the hope that it will be useful, but
//=== WITHOUT ANY WARRANTY; without even the implied warranty of
//=== MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//=== General Public License for more details.
//===
//=== You should have received a copy of the GNU General Public License
//=== along with this program; if not, write to the Free Software
//=== Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//===
//=== Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
//=== Rome - Italy. email: geonetwork@osgeo.org
//==============================================================================
package org.fao.geonet.guiservices.metadata;
import jeeves.interfaces.Service;
import jeeves.server.ServiceConfig;
import jeeves.server.context.ServiceContext;
import org.fao.geonet.utils.Log;
import org.fao.geonet.utils.Xml;
import org.fao.geonet.GeonetContext;
import org.fao.geonet.constants.Edit;
import org.fao.geonet.constants.Geonet;
import org.fao.geonet.kernel.DataManager;
import org.fao.geonet.kernel.search.MetaSearcher;
import org.fao.geonet.kernel.search.SearchManager;
import org.jdom.Element;
import java.util.List;
import java.util.Random;
//=============================================================================
/** main.search service. Perform a search
*/
public class GetRandom implements Service
{
private int _maxItems;
private long _timeBetweenUpdates;
private String _relation;
private String _northBL;
private String _southBL;
private String _eastBL;
private String _westBL;
private Element _response;
private long _lastUpdateTime;
private ServiceConfig _config;
//--------------------------------------------------------------------------
//---
//--- Init
//---
//--------------------------------------------------------------------------
public void init(String appPath, ServiceConfig config) throws Exception
{
_config = config;
String sMaxItems = config.getValue("maxItems", "10");
_maxItems = Integer.parseInt(sMaxItems);
String sTimeBetweenUpdates = config.getValue("timeBetweenUpdates", "60");
_timeBetweenUpdates = Integer.parseInt(sTimeBetweenUpdates) * 1000;
// Allow the random search to be restricted to a geographic region
_relation = config.getValue("relation", "overlaps");
_northBL = config.getValue("northBL", "90");
_southBL = config.getValue("southBL", "-90");
_eastBL = config.getValue("eastBL", "180");
_westBL = config.getValue("westBL", "-180");
}
//--------------------------------------------------------------------------
//---
//--- Service
//---
//--------------------------------------------------------------------------
public Element exec(Element params, ServiceContext context) throws Exception
{
if (System.currentTimeMillis() > _lastUpdateTime + _timeBetweenUpdates)
{
GeonetContext gc = (GeonetContext) context.getHandlerContext(Geonet.CONTEXT_NAME);
SearchManager searchMan = gc.getBean(SearchManager.class);
MetaSearcher searcher = searchMan.newSearcher(SearchManager.LUCENE, Geonet.File.SEARCH_LUCENE);
try {
// FIXME: featured should be at metadata level, not at group level
Element searchRequest = new Element("request");
searchRequest.addContent(new Element(Geonet.SearchResult.BUILD_SUMMARY).setText("false"));
searchRequest.addContent(new Element("featured").setText("true"));
searchRequest.addContent(new Element("relation").setText(_relation));
searchRequest.addContent(new Element("northBL").setText(_northBL));
searchRequest.addContent(new Element("southBL").setText(_southBL));
searchRequest.addContent(new Element("eastBL").setText(_eastBL));
searchRequest.addContent(new Element("westBL").setText(_westBL));
if(Log.isDebugEnabled(Geonet.SEARCH_ENGINE))
Log.debug(Geonet.SEARCH_ENGINE, "RANDOM SEARCH CRITERIA:\n"+ Xml.getString(searchRequest));
searcher.search(context, searchRequest, _config);
Element presentRequest = new Element("request");
presentRequest.addContent(new Element("fast").setText("true"));
presentRequest.addContent(new Element("from").setText("1"));
presentRequest.addContent(new Element("to").setText(searcher.getSize()+""));
@SuppressWarnings("unchecked")
List<Element> results = searcher.present(context, presentRequest, _config).getChildren();
_response = new Element("response");
for (int i = 0; i < _maxItems && results.size() > 1; i++) {
Random rnd = new Random();
int r = rnd.nextInt(results.size() - 1) + 1; // skip summary
Element mdInfo = (Element)results.remove(r);
mdInfo.detach();
Element info = mdInfo.getChild("info", Edit.NAMESPACE);
String id = info.getChildText("id");
boolean forEditing = false, withValidationErrors = false, keepXlinkAttributes = false;
Element md = gc.getBean(DataManager.class).getMetadata(context, id, forEditing, withValidationErrors, keepXlinkAttributes);
_response.addContent(md);
}
_lastUpdateTime = System.currentTimeMillis();
}
finally {
searcher.close();
}
}
return (Element)_response.clone();
}
}