--- /dev/null
+package org.xml.sax.demo;
+
+// SAX event handler for demos.
+// No warranty; no copyright -- use this as you will.
+// $Id: DemoHandler.java,v 1.3 1998/05/01 20:45:16 david Exp $
+
+import org.xml.sax.HandlerBase;
+import org.xml.sax.InputSource;
+import org.xml.sax.Locator;
+import org.xml.sax.AttributeList;
+import org.xml.sax.EntityResolver;
+import org.xml.sax.DTDHandler;
+import org.xml.sax.DocumentHandler;
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.SAXParseException;
+
+
+/**
+ * Event handler class for SAX demos.
+ *
+ * <p>This handler simply reports all of the events that it receives.
+ * It is useful for testing and comparing SAX implementations, and
+ * for teaching or learning about SAX. This is also a demonstration
+ * of how one class can implement all four handler interfaces.</p>
+ *
+ * @see org.xml.sax.EntityResolver
+ * @see org.xml.sax.DTDHandler
+ * @see org.xml.sax.DocumentHandler
+ * @see org.xml.sax.ErrorHandler
+ */
+public class DemoHandler
+ implements EntityResolver, DTDHandler, DocumentHandler, ErrorHandler
+{
+
+
+\f
+ //////////////////////////////////////////////////////////////////////
+ // Implementation of org.xml.sax.EntityResolver
+ //////////////////////////////////////////////////////////////////////
+
+
+ /**
+ * Display requests for entity resolution.
+ *
+ * <p>The SAX parser will invoke this method to give the application
+ * a chance to resolve entities. This implementation always
+ * returns null, so that the parser will resolve the entity
+ * itself.</p>
+ *
+ * @see org.xml.sax.EntityResolver#resolveEntity
+ */
+ @Override
+ public InputSource resolveEntity (String publicId, String systemId)
+ {
+ System.out.print("Resolve entity:");
+ if (publicId != null) {
+ System.out.print(" publicId=\"" + publicId + '"');
+ }
+ System.out.println(" systemId=\"" + systemId + '"');
+
+ return null;
+ }
+
+
+\f
+ //////////////////////////////////////////////////////////////////////
+ // Implementation of org.xml.sax.DTDHandler
+ //////////////////////////////////////////////////////////////////////
+
+
+ /**
+ * Display notation declarations as they are reported.
+ *
+ * @see org.xml.sax.DTDHandler#notationDecl
+ */
+ @Override
+ public void notationDecl (String name, String publicId, String systemId)
+ {
+ System.out.print("Notation declaration: " + name);
+ if (publicId != null) {
+ System.out.print(" publicId=\"" + publicId + '"');
+ }
+ if (systemId != null) {
+ System.out.print(" systemId=\"" + systemId + '"');
+ }
+ System.out.print('\n');
+ }
+
+
+ /**
+ * Display unparsed entity declarations as they are reported.
+ *
+ * @see org.xml.sax.DTDHandler#unparsedEntityDecl
+ */
+ @Override
+ public void unparsedEntityDecl (String name,
+ String publicId,
+ String systemId,
+ String notationName)
+ {
+ System.out.print("Unparsed Entity Declaration: " + name);
+ if (publicId != null) {
+ System.out.print(" publicId=\"" + publicId + '"');
+ }
+ if (systemId != null) {
+ System.out.print(" systemId=\"" + systemId + '"');
+ }
+ System.out.println(" notationName=\"" + notationName + '"');
+ }
+
+
+\f
+ //////////////////////////////////////////////////////////////////////
+ // Implementation of org.xml.sax.DocumentHandler
+ //////////////////////////////////////////////////////////////////////
+
+
+ /**
+ * Print a message when the parser provides a locator.
+ *
+ * <p>Not all SAX parsers will provide a locator object.</p>
+ *
+ * @see org.xml.sax.DocumentHandler#setDocumentLocator
+ */
+ @Override
+ public void setDocumentLocator (Locator locator)
+ {
+ System.out.println("Document locator supplied.");
+ }
+
+
+ /**
+ * Print a message at the start of the document.
+ *
+ * @see org.xml.sax.DocumentHandler#startDocument
+ */
+ @Override
+ public void startDocument ()
+ {
+ System.out.println("Start document");
+ }
+
+
+ /**
+ * Print a message for the end of the document.
+ *
+ * @see org.xml.sax.DocumentHandler#endDocument
+ */
+ @Override
+ public void endDocument ()
+ {
+ System.out.println("End document");
+ }
+
+
+ /**
+ * Print a message for the start of an element.
+ *
+ * <p>Display all attributes on separate lines, indented.</p>
+ *
+ * @see org.xml.sax.DocumentHandler#startElement
+ */
+ @Override
+ public void startElement (String name, AttributeList attributes)
+ {
+ System.out.println("Start element: " + name);
+ for (int i = 0; i < attributes.getLength(); i++) {
+ System.out.println(" Attribute: " +
+ attributes.getName(i) +
+ ' ' +
+ attributes.getType(i) +
+ " \"" +
+ attributes.getValue(i) +
+ '"');
+ }
+ }
+
+
+ /**
+ * Print a message for the end of an element.
+ *
+ * @see org.xml.sax.DocumentHandler#endElement
+ */
+ @Override
+ public void endElement (String name)
+ {
+ System.out.println("End element: " + name);
+ }
+
+
+ /**
+ * Print a message for character data.
+ *
+ * @see org.xml.sax.DocumentHandler#characters
+ */
+ @Override
+ public void characters (char ch[], int start, int length)
+ {
+ System.out.print("Characters: ");
+ display(ch, start, length);
+ }
+
+
+ /**
+ * Print a message for ignorable whitespace.
+ *
+ * @see org.xml.sax.DocumentHandler#ignorableWhitespace
+ */
+ @Override
+ public void ignorableWhitespace (char ch[], int start, int length)
+ {
+ System.out.print("Ignorable Whitespace: ");
+ display(ch, start, length);
+ }
+
+
+ /**
+ * Print a message for a processing instruction.
+ *
+ * @see org.xml.sax.DocumentHandler#processingInstruction
+ */
+ @Override
+ public void processingInstruction (String target, String data)
+ {
+ System.out.println("Processing instruction: " + target + ' ' + data);
+ }
+
+
+\f
+ //////////////////////////////////////////////////////////////////////
+ // Implementation of org.xml.sax.ErrorHandler
+ //////////////////////////////////////////////////////////////////////
+
+
+ /**
+ * Report all warnings, and continue parsing.
+ *
+ * @see org.xml.sax.ErrorHandler#warning
+ */
+ @Override
+ public void warning (SAXParseException exception)
+ {
+ System.out.println("Warning: " +
+ exception.getMessage() +
+ " (" +
+ exception.getSystemId() +
+ ':' +
+ exception.getLineNumber() +
+ ',' +
+ exception.getColumnNumber() +
+ ')');
+ }
+
+
+ /**
+ * Report all recoverable errors, and try to continue parsing.
+ *
+ * @see org.xml.sax.ErrorHandler#error
+ */
+ @Override
+ public void error (SAXParseException exception)
+ {
+ System.out.println("Recoverable Error: " +
+ exception.getMessage() +
+ " (" +
+ exception.getSystemId() +
+ ':' +
+ exception.getLineNumber() +
+ ',' +
+ exception.getColumnNumber() +
+ ')');
+ }
+
+
+ /**
+ * Report all fatal errors, and try to continue parsing.
+ *
+ * <p>Note: results are no longer reliable once a fatal error has
+ * been reported.</p>
+ *
+ * @see org.xml.sax.ErrorHandler#fatalError
+ */
+ @Override
+ public void fatalError (SAXParseException exception)
+ {
+ System.out.println("Fatal Error: " +
+ exception.getMessage() +
+ " (" +
+ exception.getSystemId() +
+ ':' +
+ exception.getLineNumber() +
+ ',' +
+ exception.getColumnNumber() +
+ ')');
+ }
+
+
+\f
+ //////////////////////////////////////////////////////////////////////
+ // Utility routines.
+ //////////////////////////////////////////////////////////////////////
+
+
+ /**
+ * Display text, escaping some characters.
+ */
+ private static void display (char ch[], int start, int length)
+ {
+ for (int i = start; i < start + length; i++) {
+ switch (ch[i]) {
+ case '\n':
+ System.out.print("\\n");
+ break;
+ case '\t':
+ System.out.print("\\t");
+ break;
+ default:
+ System.out.print(ch[i]);
+ break;
+ }
+ }
+ System.out.print("\n");
+ }
+
+}
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