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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>Implementation of Schema for W3C XML Schemas which
 * contains schema components from one target namespace.</p>
 *
 * @author Michael Glavassevich, IBM
 */
final class SimpleXMLSchema extends AbstractXMLSchema implements XMLGrammarPool {

    /** Zero length grammar array. */
    private static final Grammar [] ZERO_LENGTH_GRAMMAR_ARRAY = new Grammar [0];

    private Grammar fGrammar;
    private Grammar[] fGrammars;
    private XMLGrammarDescription fGrammarDescription;

    public SimpleXMLSchema(Grammar grammar) {
        fGrammar = grammar;
        fGrammars = new Grammar[] {grammar};
        fGrammarDescription = grammar.getGrammarDescription();
    }

    /*
     * XMLGrammarPool methods
     */

    public Grammar[] retrieveInitialGrammarSet(String grammarType) {
        return XMLGrammarDescription.XML_SCHEMA.equals(grammarType) ?
                (Grammar[]) fGrammars.clone() : ZERO_LENGTH_GRAMMAR_ARRAY;
    }

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

    public Grammar retrieveGrammar(XMLGrammarDescription desc) {
        return fGrammarDescription.equals(desc) ? fGrammar : null;
    }

    public void lockPool() {}

    public void unlockPool() {}

    public void clear() {}

    /*
     * XSGrammarPoolContainer methods
     */

    public XMLGrammarPool getGrammarPool() {
        return this;
    }

    public boolean isFullyComposed() {
        return true;
    }

} // SimpleXMLSchema
