/*
 * Copyright 2003-2005 The Apache Software Foundation.
 *
 * Licensed 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.
 */
package org.apache.pluto.descriptors.services.castor;

import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import java.io.IOException;
import java.io.InputStream;

/**
 * Entity Resolver which first looks for dtd and xls
 * locally in our packaged.
 *
 * @author <a href="ddewolf@apache.org">David H. DeWolf</a>
 * @version 1.0
 * @since 1.1
 */
public class EntityResolverImpl implements EntityResolver {

    public InputSource resolveEntity(String publicId, String systemId)
        throws SAXException, IOException {
        int idx = systemId.lastIndexOf('/');
        String name = systemId.substring(idx+1);
        InputStream in = getClass().getResourceAsStream(name);
        if(in != null) {
            return new InputSource(in);
        }
        return null;
    }
}