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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xerces.jaxp.validation;
import java.lang.ref.WeakReference;
import org.apache.xerces.xni.grammars.XMLGrammarPool;
/**
* <p>An implementation of Schema for W3C XML Schemas
* that keeps a weak reference to its grammar pool. If
* no validators currently have a reference to the
* grammar pool, the garbage collector is free to reclaim
* its memory.</p>
*
* @author Michael Glavassevich, IBM
* @version $Id: WeakReferenceXMLSchema.java,v 1.2 2009/12/10 03:18:25 matthewoliver Exp $
*/
final class WeakReferenceXMLSchema extends AbstractXMLSchema {
/** Weak reference to grammar pool. */
private WeakReference fGrammarPool = new WeakReference(null);
public WeakReferenceXMLSchema() {}
/*
* XSGrammarPoolContainer methods
*/
public synchronized XMLGrammarPool getGrammarPool() {
XMLGrammarPool grammarPool = (XMLGrammarPool) fGrammarPool.get();
// If there's no grammar pool then either we haven't created one
// yet or the garbage collector has already cleaned out the previous one.
if (grammarPool == null) {
grammarPool = new SoftReferenceGrammarPool();
fGrammarPool = new WeakReference(grammarPool);
}
return grammarPool;
}
public boolean isFullyComposed() {
return false;
}
} // WeakReferenceXMLSchema
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