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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2015-2016 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.
 */
package org.glassfish.hk2.xml.internal;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import javax.xml.bind.Unmarshaller.Listener;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;

import org.glassfish.hk2.api.DescriptorVisibility;
import org.glassfish.hk2.api.Visibility;
import org.glassfish.hk2.xml.api.XmlRootHandle;
import org.glassfish.hk2.xml.spi.Model;
import org.glassfish.hk2.xml.spi.PreGenerationRequirement;
import org.glassfish.hk2.xml.spi.XmlServiceParser;

/**
 * @author jwells
 *
 */
@Singleton
@Visibility(DescriptorVisibility.LOCAL)
public class DomXmlParser implements XmlServiceParser {
    private final XMLInputFactory xif = XMLInputFactory.newInstance();
    
    @Inject
    private Provider xmlService;

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.spi.XmlServiceParser#parseRoot(java.lang.Class, java.net.URI, javax.xml.bind.Unmarshaller.Listener)
     */
    @SuppressWarnings("unchecked")
    @Override
    public  T parseRoot(Model rootModel, URI location, Listener listener)
            throws Exception {
        InputStream urlStream = location.toURL().openStream();
        try {
            XMLStreamReader xmlStreamReader = xif.createXMLStreamReader(urlStream);
            try {
                return (T) XmlStreamImpl.parseRoot(xmlService.get(), rootModel, xmlStreamReader, listener);
            }
            finally {
                xmlStreamReader.close();
            }
        }
        finally {
            urlStream.close();
        }
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.spi.XmlServiceParser#getPreGenerationRequirement()
     */
    @Override
    public PreGenerationRequirement getPreGenerationRequirement() {
        return PreGenerationRequirement.LAZY_PREGENERATION;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.spi.XmlServiceParser#marshall(java.io.OutputStream, org.glassfish.hk2.xml.api.XmlRootHandle)
     */
    @Override
    public  void marshall(OutputStream outputStream, XmlRootHandle root)
            throws IOException {
        XmlStreamImpl.marshall(outputStream, root);
    }
}