readonlygrammarpool.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 103 行

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights 
 * reserved.
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package com.sun.org.apache.xerces.internal.jaxp.validation;

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

/**
 * Filter {@link XMLGrammarPool} that exposes a read-only view
 * of the underlying pool.
 * 
 * @author
 *     Kohsuke Kawaguchi ([e-mail])
 */
public class ReadonlyGrammarPool implements XMLGrammarPool {
    
    private final XMLGrammarPool core;
    
    public ReadonlyGrammarPool( XMLGrammarPool pool ) {
        this.core = pool;
    }
    
    public void cacheGrammars(String grammarType, Grammar[] grammars) {
        ; // noop. don't let caching to happen
    }

    public void clear() {
        ; // noop. cache is read-only.
    }

    public void lockPool() {
        ; // noop. this pool is always read-only
    }

    public Grammar retrieveGrammar(XMLGrammarDescription desc) {
        return core.retrieveGrammar(desc);
    }

    public Grammar[] retrieveInitialGrammarSet(String grammarType) {
        return core.retrieveInitialGrammarSet(grammarType);
    }

    public void unlockPool() {
        ; // noop. this pool is always read-only.
    }

}