/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2004-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*/
package org.geotools.data.wfs.v1_0_0;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.geotools.filter.visitor.DuplicatingFilterVisitor;
import org.opengis.filter.Id;
import org.opengis.filter.identity.FeatureId;
import org.opengis.filter.identity.Identifier;
/**
* Changes all the Fids in FidFilters to be translated to the concrete fid.
* <p>
* WFS has a difficult situation where FIDs are not assigned until after a commit.
* So in order to make it easier for the end programmer this visitor will convert any fids
* that were returned to client programs before the commit to the final FID after the commit
* was made.
* </p>
* <p>
* This visitor will copy the provided filter and update any feature identifiers according
* to the provided mapping.
*
* @author Jesse
*/
class FidFilterVisitor extends DuplicatingFilterVisitor {
/** Map of BEFORE to AFTER */
private Map<String,String> fidMap;
/**
* Update a filter based on the provided map.
*
* @param fidMap Map of before (keys) to after (values) used to update feature identifiers
*/
public FidFilterVisitor(Map<String,String> fidMap) {
this.fidMap=fidMap;
}
@Override
public Object visit(Id filter, Object extraData) {
Set<FeatureId> fidSet = new HashSet<FeatureId>();
for( Identifier identifier : filter.getIdentifiers() ){
String target = (String) identifier.getID();
String fid = getFinalFid( target );
fidSet.add( ff.featureId( fid ) );
}
return ff.id( fidSet );
}
/**
* Returns the final version of the FID. If a commit has changed the FID the new fid will be returned otherwise the same fid will be returned.
*
* @return the final version of the FID
*/
public synchronized String getFinalFid(String fid) {
String finalFid=(String) fidMap.get(fid);
if( finalFid==null ){
return fid;
}
return finalFid;
}
}