/*-- 

 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.File;
import java.io.FileWriter;
import java.io.IOException;

import org.jdom.Document;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.input.JDOMFactory;
import org.jdom.output.XMLOutputter;

/**
 * <code><b>ElementChanger</b></code> demonstrates how custom
 *   JDOM subclasses can be used when loading an XML document.
 *   To demonstrate, a file is read in using custom subclasses,
 *   and then written out. The effect of the custom subclasses
 *   is then visible on the output document.
 */
public class ElementChanger {

    /**
     * <p>This method loads the supplied XML document, uses
     *   the custom <code>{@link ORAElement}</code> via the
     *   <code>{@link CustomJDOMFactory}</code>, and then
     *   writes out the customized document to the supplied
     *   output file.</p>
     *
     * @param inputFilename the file to load the XML from.
     * @param outputFilename the file to write XML to.
     * @throws <code>IOException</code> - when read/write errors
     *         occur.
     * @throws <code>JDOMException</code> - when problems with
     *         JDOM occur.
     */
    public void change(String inputFilename, String outputFilename)
        throws IOException, JDOMException {

        // Create builder and set up factory
        SAXBuilder builder = new SAXBuilder();
        JDOMFactory factory = new CustomJDOMFactory();
        builder.setFactory(factory);
        
        // Build document 
        Document doc = builder.build(inputFilename);

        // Output document
        XMLOutputter outputter = new XMLOutputter(); 
        outputter.output(doc, new FileWriter(new File(outputFilename)));
    }

    /**
     * <p>Provide a static entry point for testing.</p>
     */
    public static void main(String[] args) {
        if (args.length != 2) {
            System.out.println("Usage: javaxml2.ElementChanger " +
                "[XML Input Filename] [XML Output Filename]");
            return;
        }

        try {
            ElementChanger changer = new ElementChanger();
            changer.change(args[0], args[1]);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}