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package com.sun.org.apache.xerces.internal.jaxp.validation;

import java.lang.ref.WeakReference;

import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;

/**
 * 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.
 * 
 * @author Michael Glavassevich, IBM
 * @version $Id: WeakReferenceXMLSchema.java,v 1.5 2010-11-01 04:40:08 joehw 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