/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

import java.io.IOException;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLResolver;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.stream.StreamSource;

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * @author Kohsuke Kawaguchi
 */
public class XMLResolverAdapter implements XMLResolver {
    private final EntityResolver entityResolver;
    private final XMLInputFactory inputFactory;

    public XMLResolverAdapter(XMLInputFactory inputFactory, EntityResolver entityResolver) {
        this.inputFactory = inputFactory;
        this.entityResolver = entityResolver;
    }

    public Object resolveEntity(String publicID, String systemID, String baseURI, String namespace) throws XMLStreamException {
        try {
            InputSource is = entityResolver.resolveEntity(publicID,systemID);
            if(is==null)        return null;

            StreamSource ss = new StreamSource();
            ss.setInputStream(is.getByteStream());
            ss.setPublicId(is.getPublicId());
            ss.setSystemId(is.getSystemId());
            ss.setReader(is.getCharacterStream());
            // this ignores the is.getEncoding(), but that's JAXP's fault.
            return inputFactory.createXMLStreamReader(ss);
        } catch (SAXException e) {
            throw new XMLStreamException(e);
        } catch (IOException e) {
            throw new XMLStreamException(e);
        }
    }
}
