/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2001-2008, 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.resources;
import java.lang.ref.SoftReference;
import java.nio.ByteBuffer;
import org.geotools.resources.NIOUtilities;
import org.geotools.util.WeakCollectionCleaner;
/**
* A soft reference that will clear the contained byte buffer before getting garbage collected
* @author Andrea Aime - OpenGeo
*
*/
class BufferSoftReference extends SoftReference<ByteBuffer> {
public BufferSoftReference(ByteBuffer referent) {
super(referent, WeakCollectionCleaner.DEFAULT.getReferenceQueue());
}
@Override
public void clear() {
ByteBuffer buffer = get();
NIOUtilities.clean(buffer);
super.clear();
}
@Override
public boolean equals(Object other) {
if(!(other instanceof BufferSoftReference)) {
return false;
}
ByteBuffer buffer = get();
if(buffer == null) {
return false;
} else {
ByteBuffer otherBuffer = ((BufferSoftReference) other).get();
if(otherBuffer == null) {
return false;
}
return otherBuffer == buffer;
}
}
}