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Xerces2 provides high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces continues to build upon the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 provides fully conforming XML Schema 1.0 and 1.1 processors. An experimental implementation of the "XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010)" is also provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2004 The Apache Software Foundation.  
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * .
 */

package org.apache.xerces.util;


import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.parser.XMLEntityResolver;
import org.apache.xerces.xni.parser.XMLInputSource;

import org.w3c.dom.ls.LSResourceResolver;
import org.w3c.dom.ls.LSInput;

import java.io.InputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;


/**
 * This class wraps DOM entity resolver to XNI entity resolver.
 *
 * @see LSResourceResolver
 *
 * @author Gopal Sharma, SUN MicroSystems Inc.
 * @author Elena Litani, IBM 
 * @author Ramesh Mandava, Sun Microsystems
 * @version $Id: DOMEntityResolverWrapper.java,v 1.10 2004/01/22 15:51:48 mrglavas Exp $
 */
public class DOMEntityResolverWrapper
    implements XMLEntityResolver {

    //
    // Data
    //

    /** XML 1.0 type constant according to DOM L3 LS CR spec "http://www.w3.org/TR/2003/CR-DOM-Level-3-LS-20031107" */
    private static final String XML_TYPE = "http://www.w3.org/TR/REC-xml";
    
    /** XML Schema constant according to DOM L3 LS CR spec "http://www.w3.org/TR/2003/CR-DOM-Level-3-LS-20031107" */
    private static final String XSD_TYPE = "http://www.w3.org/2001/XMLSchema";

    /** The DOM entity resolver. */
    protected LSResourceResolver fEntityResolver;

    //
    // Constructors
    //

    /** Default constructor. */
    public DOMEntityResolverWrapper() {}

    /** Wraps the specified DOM entity resolver. */
    public DOMEntityResolverWrapper(LSResourceResolver entityResolver) {
        setEntityResolver(entityResolver);
    } // LSResourceResolver

    //
    // Public methods
    //

    /** Sets the DOM entity resolver. */
    public void setEntityResolver(LSResourceResolver entityResolver) {
        fEntityResolver = entityResolver;
    } // setEntityResolver(LSResourceResolver)

    /** Returns the DOM entity resolver. */
    public LSResourceResolver getEntityResolver() {
        return fEntityResolver;
    } // getEntityResolver():LSResourceResolver

    //
    // XMLEntityResolver methods
    //
    
    /**
     * Resolves an external parsed entity. If the entity cannot be
     * resolved, this method should return null.
     *
     * @param resourceIdentifier	description of the resource to be revsoved
     * @throws XNIException Thrown on general error.
     * @throws IOException  Thrown if resolved entity stream cannot be
     *                      opened or some other i/o error occurs.
     */
    public XMLInputSource resolveEntity(XMLResourceIdentifier resourceIdentifier)
        throws XNIException, IOException {
        // resolve entity using DOM entity resolver
        if (fEntityResolver != null) {
            try {
                // For entity resolution the type of the resource would be  XML TYPE
                // DOM L3 LS spec mention only the XML 1.0 recommendation right now
                LSInput inputSource =
                    resourceIdentifier == null
                        ? fEntityResolver.resolveResource(
                            null,
                            null,
                            null,
                            null,
                            null)
                        : fEntityResolver.resolveResource(
                            getType(resourceIdentifier),
                            resourceIdentifier.getNamespace(),
                            resourceIdentifier.getPublicId(),
                            resourceIdentifier.getLiteralSystemId(),
                            resourceIdentifier.getBaseSystemId());
                if (inputSource != null) {
                    String publicId = inputSource.getPublicId();
                    String systemId = inputSource.getSystemId();
                    String baseSystemId = inputSource.getBaseURI();
                    InputStream byteStream = inputSource.getByteStream();
                    Reader charStream = inputSource.getCharacterStream();
                    String encoding = inputSource.getEncoding();
                    String data = inputSource.getStringData();
                    XMLInputSource xmlInputSource =
                        new XMLInputSource(publicId, systemId, baseSystemId);

                    if (charStream != null) {
                        xmlInputSource.setCharacterStream(charStream);
                    }
                    if (byteStream != null) {
                        xmlInputSource.setByteStream((InputStream) byteStream);
                    }
                    if (data != null && data.length() != 0) {
                        xmlInputSource.setCharacterStream(
                            new StringReader(data));
                    }
                    xmlInputSource.setEncoding(encoding);
                    return xmlInputSource;
                }
            }

            // error resolving entity
            catch (Exception e) {
                // REVISIT:
                // can at this point we receive wrapped exception?

                throw new XNIException(e);
            }
        }

        // unable to resolve entity
        return null;

    } // resolveEntity(String,String,String):XMLInputSource
    
    /** Determines the type of resource being resolved **/
    private String getType(XMLResourceIdentifier resourceIdentifier) {
        if (resourceIdentifier instanceof XMLGrammarDescription) {
            XMLGrammarDescription desc = (XMLGrammarDescription) resourceIdentifier;
            if (XMLGrammarDescription.XML_SCHEMA.equals(desc.getGrammarType())) {
                return XSD_TYPE;
            }
        }
        return XML_TYPE;
    } // getType(XMLResourceIdentifier):String
    
} // DOMEntityResolverWrapper