/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011 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.filter.function;
import org.geotools.filter.visitor.DuplicatingFilterVisitor;
import org.opengis.filter.expression.PropertyName;
/**
* Replace "featureMembers/ * /ATTRIBUTE" change with "ATTRIBUTE"
* <p>
* This is used to clean up xpath expressions prior to use by
* the various aggregate functions such as Collection_AverageFunction.
*
* @since 8.0
*/
public final class CollectionFeatureMemberFilterVisitor extends DuplicatingFilterVisitor {
public Object visit(PropertyName expression, Object data) {
String xpath = expression.getPropertyName();
if (xpath.startsWith("featureMembers/*/")) {
xpath = xpath.substring(17);
} else if (xpath.startsWith("featureMember/*/")) {
xpath = xpath.substring(16);
}
return getFactory(data).property(xpath, expression.getNamespaceContext());
}
}