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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

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package com.sun.tools.internal.xjc.reader.internalizer;

import java.io.IOException;

import com.sun.xml.internal.xsom.parser.XMLParser;

import org.w3c.dom.Document;

import org.xml.sax.ContentHandler;

import org.xml.sax.EntityResolver;

import org.xml.sax.ErrorHandler;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

/**

 * {@link XMLParser} implementation that

 * parses XML from a DOM forest instead of parsing it from

 * its original location.

 *

 * @author

 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

 */

class DOMForestParser implements XMLParser {

    /** DOM forest to be "parsed". */

    private final DOMForest forest;

    /** Scanner object will do the actual SAX events generation. */

    private final DOMForestScanner scanner;

    private final XMLParser fallbackParser;

    /**

     * @param fallbackParser

     *      This parser will be used when DOMForestParser needs to parse

     *      documents that are not in the forest.

     */

    DOMForestParser( DOMForest forest, XMLParser fallbackParser ) {

        this.forest = forest;

        this.scanner = new DOMForestScanner(forest);

        this.fallbackParser = fallbackParser;

    }

    public void parse(

        InputSource source,

        ContentHandler contentHandler,

        ErrorHandler errorHandler,

        EntityResolver entityResolver )

        throws SAXException, IOException {

        String systemId = source.getSystemId();

        Document dom = forest.get(systemId);

        if(dom==null) {

            // if no DOM tree is built for it,

            // let the fall back parser parse the original document.

            //

            // for example, XSOM parses datatypes.xsd (XML Schema part 2)

            // but this will never be built into the forest.

            fallbackParser.parse( source, contentHandler, errorHandler, entityResolver );

            return;

        }

        scanner.scan( dom, contentHandler );

    }

}