/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2014 by:
 Department of Geography, University of Bonn
 and
 lat/lon GmbH

 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; either version 2.1 of the License, or (at your option)
 any later version.
 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.
 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 Contact information:

 lat/lon GmbH
 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/

 Department of Geography, University of Bonn
 Prof. Dr. Klaus Greve
 Postfach 1147, 53001 Bonn
 Germany
 http://www.geographie.uni-bonn.de/deegree/

 e-mail: info@deegree.org
 ----------------------------------------------------------------------------*/
package org.deegree.feature.persistence.transaction;

import java.util.HashSet;
import java.util.Set;

import org.deegree.commons.tom.Reference;
import org.deegree.commons.tom.gml.GMLObject;
import org.deegree.feature.Feature;
import org.deegree.geometry.Geometry;
import org.deegree.gml.utils.GMLObjectVisitor;

class IdChecker implements GMLObjectVisitor {

    final Set<String> ids = new HashSet<String>();

    @Override
    public boolean visitGeometry( final Geometry geom ) {
        checkForDuplication( geom.getId() );
        return true;
    }

    @Override
    public boolean visitFeature( final Feature feature ) {
        checkForDuplication( feature.getId() );
        return true;
    }

    @Override
    public boolean visitObject( GMLObject o ) {
        return true;
    }

    @Override
    public boolean visitReference( final Reference<?> ref ) {
        return false;
    }

    private void checkForDuplication( final String id ) {
        if ( id != null ) {
            if ( ids.contains( id ) ) {
                final String msg = "Duplication of object id '" + id + "'.";
                throw new IllegalArgumentException( msg );
            }
            ids.add( id );
        }
    }

}

@@ -2025,16 +2025,22 @@
 tObject(
+ final
  GMLObje
@@ -2044,24 +2044,66 @@
 bject o ) %7B%0A
+        checkForDuplication( o.getId() );%0A
         retu

Add missing duplication check to IdChecker