/*-- 

 Copyright (C) 2001 Brett McLaughlin.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows 
    these conditions in the documentation and/or other materials 
    provided with the distribution.

 3. The name "Java and XML" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact brett@newInstance.com.
 
 In addition, we request (but do not require) that you include in the 
 end-user documentation provided with the redistribution and/or in the 
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed for the
      'Java and XML' book, by Brett McLaughlin (O'Reilly & Associates)."

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 */
package javaxml2;

import java.io.IOException;

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

/**
 * <b><code>SimpleEntityResolver</code></b> shows how to implement the SAX
 *   <code>EntityResolver</code> interface, and locally resolve
 *   an entity that has a specific Internet URI.
 */
public class SimpleEntityResolver implements EntityResolver {
    
    /**
     * <p>This resolves URIs for entities locally, if needed.</p>
     *
     * @param publicID the public ID of the reported entity.
     * @param systemID the system ID of the reported entity.
     * @return <code>InputSource</code> - the source to read the entity
     *         from.
     * @throws <code>IOException</code> - when resolution errors occur.
     * @throws <code>SAXException</code> - when errors in creating a new
     *         <code>InputSource</code> may result.
     */
    public InputSource resolveEntity(String publicID, String systemID)
        throws IOException, SAXException {

        // Handle references to online version of copyright.xml   
        if (systemID.equals(
            "http://www.newInstance.com/javaxml2/copyright.xml")) {
            return new InputSource(
                "file:///c:/javaxml2/ch04/xml/copyright.xml");
        }            
        
        // In the default case, return null
        return null;    
    }
}