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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

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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>Implementation of Schema for W3C XML Schemas

 * which contains no schema components.</p>

 *

 * @author Michael Glavassevich, IBM

 */

final class EmptyXMLSchema extends AbstractXMLSchema implements XMLGrammarPool {

    /** Zero length grammar array. */

    private static final Grammar [] ZERO_LENGTH_GRAMMAR_ARRAY = new Grammar [0];

    public EmptyXMLSchema() {}

    /*

     * XMLGrammarPool methods

     */

    public Grammar[] retrieveInitialGrammarSet(String grammarType) {

        return ZERO_LENGTH_GRAMMAR_ARRAY;

    }

    public void cacheGrammars(String grammarType, Grammar[] grammars) {}

    public Grammar retrieveGrammar(XMLGrammarDescription desc) {

        return null;

    }

    public void lockPool() {}

    public void unlockPool() {}

    public void clear() {}

    /*

     * XSGrammarPoolContainer methods

     */

    public XMLGrammarPool getGrammarPool() {

        return this;

    }

    public boolean isFullyComposed() {

        return true;

    }

} // EmptyXMLSchema