package org.apache.archiva.redback.components.modello.jpox;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

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

import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * JdoEntityResolver 
 *
 * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a>
 * @version $Id: JdoEntityResolver.java 614 2006-09-06 14:26:11Z joakime $
 */
public class JdoEntityResolver
    implements EntityResolver
{
    private static final Map PUBLICID_TO_RESOURCE_MAP;

    static
    {
        PUBLICID_TO_RESOURCE_MAP = new HashMap();

        PUBLICID_TO_RESOURCE_MAP.put( "-//Sun Microsystems, Inc.//DTD Java Data Objects Metadata 1.0//EN",
                                      "/jdo_1_0.dtd" );
        PUBLICID_TO_RESOURCE_MAP.put( "-//Sun Microsystems, Inc.//DTD Java Data Objects Metadata 2.0//EN",
                                      "/jdo_2_0.dtd" );
    }

    public InputSource resolveEntity( String publicId, String systemId )
        throws SAXException, IOException
    {
        if ( PUBLICID_TO_RESOURCE_MAP.containsKey( publicId ) )
        {
            URL url = this.getClass().getResource( (String) PUBLICID_TO_RESOURCE_MAP.get( publicId ) );
            return new InputSource( url.openStream() );
        }

        return null;
    }

}