/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2010, 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.gml2;
import java.util.ArrayList;
import java.util.Iterator;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.xsd.XSDPackage;
import org.eclipse.xsd.XSDSchema;
import org.eclipse.xsd.XSDSchemaDirective;
import org.geotools.util.Utilities;
/**
* Adapter to prevent memory leaks that occur when importing a gml schema.
* <p>
* When an application schema imports the gml schema a link from the gml schema to the app schema
* is created. Since the gml schema is a singleton we store permenantly this causes a memory leak.
* This adapter watches the {@link XSDSchema#getReferencingDirectives()} list and ensures that it
* does not continue to grow by only allowing unique schema references (in terms of target namespace)
* to reference it.
* </p>
* @author Justin Deoliveira, OpenGeo
*
*
*
* @source $URL$
*/
public class ReferencingDirectiveLeakPreventer implements Adapter {
XSDSchema target;
public Notifier getTarget() {
return target;
}
public void setTarget(Notifier newTarget) {
target = (XSDSchema) newTarget;
}
public boolean isAdapterForType(Object type) {
return type instanceof XSDSchema;
}
public void notifyChanged(Notification notification) {
int featureId = notification.getFeatureID(target.getClass());
if (featureId != XSDPackage.XSD_SCHEMA__REFERENCING_DIRECTIVES) {
return;
}
if (notification.getEventType() != Notification.ADD) {
return;
}
if (!(notification.getNewValue() instanceof XSDSchemaDirective)) {
return;
}
XSDSchemaDirective newDirective = (XSDSchemaDirective) notification.getNewValue();
XSDSchema schema = newDirective.getSchema();
synchronized (target) {
ArrayList<Integer> toremove = new ArrayList();
for (int i = 0; i < target.getReferencingDirectives().size(); i++) {
XSDSchemaDirective directive =
(XSDSchemaDirective) target.getReferencingDirectives().get(i);
XSDSchema schema2 = directive.getSchema();
if (schema2 == null) {
toremove.add(i);
continue;
}
String ns1 = schema != null ? schema.getTargetNamespace() : null;
String ns2 = schema2.getTargetNamespace();
if (Utilities.equals(ns1, ns2)) {
toremove.add(i);
}
}
//iterate in reverse order and skip last to keep last version
for (int i = toremove.size()-2; i > -1; i--) {
target.getReferencingDirectives().remove(toremove.get(i).intValue());
}
}
}
}