// SAXTest.java - test application for SAX2package org.htmlparser.tests;import java.io.IOException;import java.net.MalformedURLException;import java.net.URL;import org.xml.sax.Attributes;import org.xml.sax.ContentHandler;import org.xml.sax.ErrorHandler;import org.xml.sax.Locator;import org.xml.sax.SAXException;import org.xml.sax.SAXNotRecognizedException;import org.xml.sax.SAXNotSupportedException;import org.xml.sax.SAXParseException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.XMLReaderFactory;/** * Test class for SAX2. */public class SAXTest implements ContentHandler, ErrorHandler{    ////////////////////////////////////////////////////////////////////    // Main app.    ////////////////////////////////////////////////////////////////////    /**     * Main application entry point.     */    public static void main (String args[])    {	System.out.println("************************************" +			   "************************************");	System.out.println("* Testing SAX2");	System.out.println("************************************" +			   "************************************");	System.out.print("\n");	//	// Figure out the XML reader	////	String driverName =//	    System.getProperty("org.xml.sax.driver",//			       "org.apache.xerces.parsers.SAXParser");        String driverName = "org.htmlparser.sax.XMLReader";	System.out.println("SAX driver class: " +			   driverName +			   "\n  (you can specify a different one using the " +			   "org.xml.sax.driver property)");	System.out.print("\n");	//	// Create the XML reader	//	System.out.println("Now, we'll try to create an instance of the " +			   "driver, using XMLReaderFactory");	XMLReader reader = null;	try {	    reader = XMLReaderFactory.createXMLReader(driverName);	} catch (SAXException e) {	    System.out.println("Failed to create XMLReader: " +			       e.getMessage() +			       "\nMake sure that the class actually " +			       "exists and is present on your CLASSPATH" +			       "\nor specify a different class using the " +			       "org.xml.sax.driver property");	    System.exit(1);	}	System.out.println("XMLReader created successfully\n");	//	// Check features.	//	System.out.println("Checking defaults for some well-known features:");	checkFeature(reader, "http://xml.org/sax/features/namespaces");	checkFeature(reader, "http://xml.org/sax/features/namespace-prefixes");	checkFeature(reader, "http://xml.org/sax/features/string-interning");	checkFeature(reader, "http://xml.org/sax/features/validation");	checkFeature(reader,		     "http://xml.org/sax/features/external-general-entities");	checkFeature(reader,		     "http://xml.org/sax/features/external-parameter-entities");	System.out.print("\n");		//	// Assign handlers.	//	System.out.println("Creating and assigning handlers\n");	SAXTest handler = new SAXTest();	reader.setContentHandler(handler);	reader.setErrorHandler(handler);	//	// Parse documents.	//	if (args.length > 0) {	    for (int i = 0; i < args.length; i++) {		String systemId = makeAbsoluteURL(args[i]);		System.out.println("Trying file " + systemId);		try {		    reader.parse(systemId);		} catch (SAXException e1) {		    System.out.println(systemId +				       " failed with XML error: " +				       e1.getMessage());		} catch (IOException e2) {		    System.out.println(systemId +				       " failed with I/O error: " +				       e2.getMessage());		}		System.out.print("\n");	    }	} else {	    System.out.println("No documents supplied on command line; " +			       "parsing skipped.");	}	//	// Done.	//	System.out.println("SAX2 test finished.");    }    /**     * Check and display the value of a feature.     */    private static void checkFeature (XMLReader reader, String name)    {	try {	    System.out.println("  " +			       name +			       " = " +			       reader.getFeature(name));	} catch (SAXNotRecognizedException e) {	    System.out.println("XMLReader does not recognize feature " +			       name);	} catch (SAXNotSupportedException e) {	    System.out.println("XMLReader recognizes feature " +			       name +			       " but does not support checking its value");	}    }    /**     * Construct an absolute URL if necessary.     *     * This method is useful for relative file paths on a command     * line; it converts them to absolute file: URLs, using the     * correct path separator.  This method is based on an     * original suggestion by James Clark.     *     * @param url The (possibly relative) URL.     * @return An absolute URL of some sort.     */    private static String makeAbsoluteURL (String url)    {	URL baseURL;		String currentDirectory = System.getProperty("user.dir");	String fileSep = System.getProperty("file.separator");	String file = currentDirectory.replace(fileSep.charAt(0), '/') + '/';		if (file.charAt(0) != '/') {	    file = "/" + file;	}	try {	    baseURL = new URL("file", null, file);	    return new URL(baseURL, url).toString();	} catch (MalformedURLException e) {	    System.err.println(url + ": " + e.getMessage());	    return url;	}    }    private static String makeNSName (String uri, String localName,				      String qName)    {	if (uri.equals("")) 	    uri = "[none]";	if (localName.equals(""))	    localName = "[none]";	if (qName.equals(""))	    qName = "[none]";	return uri + '/' + localName + '/' + qName;    }    private static String escapeData (char ch[], int start, int length)    {	StringBuffer buf = new StringBuffer();	for (int i = start; i < start + length; i++) {	    switch(ch[i]) {	    case '\n':		buf.append("\\n");		break;	    case '\t':		buf.append("\\t");		break;	    case '\r':		buf.append("\\r");		break;	    default:		buf.append(ch[i]);		break;	    }	}	return buf.toString();    }    ////////////////////////////////////////////////////////////////////    // Implementation of org.xml.sax.ContentHandler.    ////////////////////////////////////////////////////////////////////    public void setDocumentLocator (Locator locator)    {	System.out.println("  EVENT: setDocumentLocator");    }    public void startDocument ()	throws SAXException    {	System.out.println("  EVENT: startDocument");    }    public void endDocument ()	throws SAXException    {	System.out.println("  EVENT: endDocument");    }    public void startPrefixMapping (String prefix, String uri)	throws SAXException    {	System.out.println("  EVENT: startPrefixMapping " +			   prefix + " = " + uri);    }    public void endPrefixMapping (String prefix)	throws SAXException    {	System.out.println("  EVENT: endPrefixMapping " + prefix);    }    public void startElement (String namespaceURI, String localName,			      String qName, Attributes atts)	throws SAXException    {	System.out.println("  EVENT: startElement " +			   makeNSName(namespaceURI, localName, qName));	int attLen = atts.getLength();	for (int i = 0; i < attLen; i++) {	    char ch[] = atts.getValue(i).toCharArray();	    System.out.println("    Attribute " +			       makeNSName(atts.getURI(i),					  atts.getLocalName(i),					  atts.getQName(i)) +			       '=' +			       escapeData(ch, 0, ch.length));	}    }    public void endElement (String namespaceURI, String localName,			    String qName)	throws SAXException    {	System.out.println("  EVENT: endElement " +			   makeNSName(namespaceURI, localName, qName));    }    public void characters (char ch[], int start, int length)	throws SAXException    {	System.out.println("  EVENT: characters " +			   escapeData(ch, start, length));    }    public void ignorableWhitespace (char ch[], int start, int length)	throws SAXException    {	System.out.println("  EVENT: ignorableWhitespace " +			   escapeData(ch, start, length));    }    public void processingInstruction (String target, String data)	throws SAXException    {	System.out.println("  EVENT: processingInstruction " +			   target + ' ' + data);    }    public void skippedEntity (String name)	throws SAXException    {	System.out.println("  EVENT: skippedEntity " + name);    }    ////////////////////////////////////////////////////////////////////    // Implementation of org.xml.sax.ErrorHandler.    ////////////////////////////////////////////////////////////////////    public void warning (SAXParseException e)	throws SAXException    {	System.out.println("  EVENT: warning " +			   e.getMessage() + ' ' +			   e.getSystemId() + ' ' +			   e.getLineNumber() + ' ' +			   e.getColumnNumber());    }    public void error (SAXParseException e)	throws SAXException    {	System.out.println("  EVENT: error " +			   e.getMessage() + ' ' +			   e.getSystemId() + ' ' +			   e.getLineNumber() + ' ' +			   e.getColumnNumber());    }    public void fatalError (SAXParseException e)	throws SAXException    {	System.out.println("  EVENT: fatal error " +			   e.getMessage() + ' ' +			   e.getSystemId() + ' ' +			   e.getLineNumber() + ' ' +			   e.getColumnNumber());    }}// end of SAXTest.java