echo01.java

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/*
 * @(#)Echo01.java 1.5 99/02/09
 *
 * Copyright (c) 2003 Sun Microsystems, Inc.  All rights reserved.  U.S.
 * Government Rights - Commercial software.  Government users are subject
 * to the Sun Microsystems, Inc. standard license agreement and
 * applicable provisions of the FAR and its supplements.  Use is subject
 * to license terms. 
 *
 * This distribution may include materials developed by third parties.
 * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks
 * or registered trademarks of Sun Microsystems, Inc. in the U.S. and
 * other countries. 
 *
 * Copyright (c) 2003 Sun Microsystems, Inc. Tous droits reserves.
 *
 * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
 * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de
 * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions
 * en vigueur de la FAR (Federal Acquisition Regulations) et des
 * supplements a celles-ci.  Distribue par des licences qui en
 * restreignent l'utilisation.
 *
 * Cette distribution peut comprendre des composants developpes par des
 * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE
 * sont des marques de fabrique ou des marques deposees de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */

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 Echo01 extends DefaultHandler
{
    StringBuffer textBuffer;
    
    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 Echo01();
      
        // 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
    {
        emit("<?xml version='1.0' encoding='UTF-8'?>");
        nl();
    }

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

    public void startElement(String namespaceURI,
                             String sName, // simple name
                             String qName, // qualified name
                             Attributes attrs)
    throws SAXException
    {
        echoText();
              String eName = sName; // element name
        if ("".equals(eName)) eName = qName; // not namespaceAware
        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);
                emit(" ");
                emit(aName+"=\""+attrs.getValue(i)+"\"");
                          }
        }
        emit(">");
    }

    public void endElement(String namespaceURI,
                           String sName, // simple name
                           String qName  // qualified name
                          )
    throws SAXException
    {
        echoText();
        String eName = sName; // element name
        if ("".equals(eName)) eName = qName; // not namespaceAware
        emit("</"+eName+">");
    }

    public void characters(char buf[], int offset, int len)
    throws SAXException
    {
                     String s = new String(buf, offset, len);
        if (textBuffer == null) {
           textBuffer = new StringBuffer(s);
        } else {
           textBuffer.append(s);
        }
    }
    
          //===========================================================
    // Utility Methods ...
    //===========================================================
    
    // Display text accumulated in the character buffer
    private void echoText()
    throws SAXException
    {
        if (textBuffer == null) return;      
                           String s = ""+textBuffer;
              emit(s);
              textBuffer = null;
    }

    // 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);
        }
    }
}