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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * this work for additional information regarding copyright ownership.
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 * (the "License"); you may not use this file except in compliance with
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 *      http://www.apache.org/licenses/LICENSE-2.0
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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;

/**
 * <p>Filter {@link XMLGrammarPool} that exposes a
 * read-only view of the underlying pool.</p>
 *
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
final 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.
    }

} // ReadOnlyGrammarPool
