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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

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 * Unless required by applicable law or agreed to in writing, software

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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>

 *

 */

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