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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
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 * Header, with the fields enclosed by brackets [] replaced by your own
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 * elects to include this software in this distribution under the [CDDL or GPL
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package com.sun.tools.xjc.util;

import java.io.IOException;

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

/**
 * {@link EntityResolver} that delegates to two {@link EntityResolver}s.
 *
 * @author Kohsuke Kawaguchi
 */
public class ForkEntityResolver implements EntityResolver {
    private final EntityResolver lhs;
    private final EntityResolver rhs;

    public ForkEntityResolver(EntityResolver lhs, EntityResolver rhs) {
        this.lhs = lhs;
        this.rhs = rhs;
    }

    public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
        InputSource is = lhs.resolveEntity(publicId, systemId);
        if(is!=null)
            return is;
        return rhs.resolveEntity(publicId,systemId);
    }
}