/*
 * @(#)Echo02.java 1.5 99/02/09
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

import java.io.*;

import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;

public class Echo02 extends DefaultHandler
{
    public static void main(String argv[])
    {
        if (argv.length != 1) {
            System.err.println("Usage: cmd filename");
            System.exit(1);
        }
        
        // Use an instance of ourselves as the SAX event handler
        DefaultHandler handler = new Echo02();
        // Use the default (non-validating) parser
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            // Set up output stream
            out = new OutputStreamWriter(System.out, "UTF8");

            // Parse the input
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse( new File(argv[0]), handler);

        } catch (Throwable t) {
            t.printStackTrace();
        }
        System.exit(0);
    }

    static private Writer  out;

    //===========================================================
    // SAX DocumentHandler methods
    //===========================================================

    public void startDocument()
    throws SAXException
    {
        nl();
        nl();
        emit("START DOCUMENT");
        nl();
        emit("<?xml version='1.0' encoding='UTF-8'?>");
    }

    public void endDocument()
    throws SAXException
    {
        nl(); emit("END DOCUMENT");
        try {
            nl();
            out.flush();
        } catch (IOException e) {
            throw new SAXException("I/O error", e);
        }
    }

    public void startElement(String namespaceURI,
                             String lName, // local name
                             String qName, // qualified name
                             Attributes attrs)
    throws SAXException
    {
        nl(); emit("ELEMENT: ");
        String eName = lName; // element name
        if ("".equals(eName)) eName = qName; // namespaceAware = false
        emit("<"+eName);
        if (attrs != null) {
            for (int i = 0; i < attrs.getLength(); i++) {
                String aName = attrs.getLocalName(i); // Attr name 
                if ("".equals(aName)) aName = attrs.getQName(i);
                nl();
                emit("   ATTR: ");
                emit(aName);
                emit("\t\"");
                emit(attrs.getValue(i));
                emit("\"");
            }
        }
        if (attrs.getLength() > 0) nl();
        emit(">");
    }

    public void endElement(String namespaceURI,
                           String sName, // simple name
                           String qName  // qualified name
                          )
    throws SAXException
    {
        nl();
        emit("END_ELM: ");
        emit("</"+sName+">");
    }

    public void characters(char buf[], int offset, int len)
    throws SAXException
    {
        nl(); emit("CHARS: |");
        String s = new String(buf, offset, len);
        emit(s);
        emit("|");
    }

    //===========================================================
    // Utility Methods ...
    //===========================================================

    // Wrap I/O exceptions in SAX exceptions, to
    // suit handler signature requirements
    private void emit(String s)
    throws SAXException
    {
        try {
            out.write(s);
            out.flush();
        } catch (IOException e) {
            throw new SAXException("I/O error", e);
        }
    }

    // Start a new line
    private void nl()
    throws SAXException
    {
        String lineEnd =  System.getProperty("line.separator");
        try {
            out.write(lineEnd);
        } catch (IOException e) {
            throw new SAXException("I/O error", e);
        }
    }
}