A Program to Display the Input from a SAX Parser
//Example XML document
/* An XML Document
<?xml version="1.0" standalone="yes"?>
<person>
<name>Joe Wang</name>
<phone type="home">306 555-9999</phone>
<email>joe@yoursite.net;</email>
</person>
*/
import java.io.IOException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
public class SAXDump {
static public void main(String[] arg) {
String filename = null;
if (arg.length == 1) {
filename = arg[0];
} else {
usage();
}
// Create a new factory that will create the parser.
SAXParserFactory spf = SAXParserFactory.newInstance();
// Create the XMLReader to be used to parse the document.
XMLReader reader = null;
try {
SAXParser parser = spf.newSAXParser();
reader = parser.getXMLReader();
} catch (Exception e) {
System.err.println(e);
System.exit(1);
}
// Specify the error handler and the content handler.
reader.setErrorHandler(new MyErrorHandler());
reader.setContentHandler(new MyContentHandler());
// Use the XMLReader to parse the entire file.
try {
InputSource is = new InputSource(filename);
reader.parse(is);
} catch (SAXException e) {
System.exit(1);
} catch (IOException e) {
System.err.println(e);
System.exit(1);
}
}
private static void usage() {
System.err.println("Usage: SAXDump <filename>");
System.exit(1);
}
}
class MyContentHandler implements ContentHandler {
private Locator locator;
/**
* The name and of the SAX document and the current location within the
* document.
*/
public void setDocumentLocator(Locator locator) {
this.locator = locator;
System.out.println("-" + locator.getLineNumber() + "---Document ID: "
+ locator.getSystemId());
}
/** The parsing of a document has started.. */
public void startDocument() {
System.out.println("-" + locator.getLineNumber()
+ "---Document parse started");
}
/** The parsing of a document has completed.. */
public void endDocument() {
System.out.println("-" + locator.getLineNumber()
+ "---Document parse ended");
}
/** The start of a namespace scope */
public void startPrefixMapping(String prefix, String uri) {
System.out.println("-" + locator.getLineNumber()
+ "---Namespace scope begins");
System.out.println(" " + prefix + "=\"" + uri + "\"");
}
/** The end of a namespace scope */
public void endPrefixMapping(String prefix) {
System.out.println("-" + locator.getLineNumber()
+ "---Namespace scope ends");
System.out.println(" " + prefix);
}
/** The opening tag of an element. */
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) {
System.out.println("-" + locator.getLineNumber()
+ "---Opening tag of an element");
System.out.println(" Namespace: " + namespaceURI);
System.out.println(" Local name: " + localName);
System.out.println(" Qualified name: " + qName);
for (int i = 0; i < atts.getLength(); i++) {
System.out.println(" Attribute: " + atts.getQName(i) + "=\""
+ atts.getValue(i) + "\"");
}
}
/** The closing tag of an element. */
public void endElement(String namespaceURI, String localName, String qName) {
System.out.println("-" + locator.getLineNumber()
+ "---Closing tag of an element");
System.out.println(" Namespace: " + namespaceURI);
System.out.println(" Local name: " + localName);
System.out.println(" Qualified name: " + qName);
}
/** Character data. */
public void characters(char[] ch, int start, int length) {
System.out.println("-" + locator.getLineNumber() + "---Character data");
showCharacters(ch, start, length);
}
/** Ignorable whitespace character data. */
public void ignorableWhitespace(char[] ch, int start, int length) {
System.out.println("-" + locator.getLineNumber() + "---Whitespace");
showCharacters(ch, start, length);
}
/** Processing Instruction */
public void processingInstruction(String target, String data) {
System.out.println("-" + locator.getLineNumber()
+ "---Processing Instruction");
System.out.println(" Target: " + target);
System.out.println(" Data: " + data);
}
/** A skipped entity. */
public void skippedEntity(String name) {
System.out.println("-" + locator.getLineNumber() + "---Skipped Entity");
System.out.println(" Name: " + name);
}
/**
* Internal method to format arrays of characters so the special whitespace
* characters will show.
*/
public void showCharacters(char[] ch, int start, int length) {
System.out.print(" \"");
for (int i = start; i < start + length; i++)
switch (ch[i]) {
case '\n':
System.out.print("\\n");
break;
case '\r':
System.out.print("\\r");
break;
case '\t':
System.out.print("\\t");
break;
default:
System.out.print(ch[i]);
break;
}
System.out.println("\"");
}
}
class MyErrorHandler implements ErrorHandler {
public void warning(SAXParseException e) throws SAXException {
show("Warning", e);
throw (e);
}
public void error(SAXParseException e) throws SAXException {
show("Error", e);
throw (e);
}
public void fatalError(SAXParseException e) throws SAXException {
show("Fatal Error", e);
throw (e);
}
private void show(String type, SAXParseException e) {
System.out.println(type + ": " + e.getMessage());
System.out.println("Line " + e.getLineNumber() + " Column "
+ e.getColumnNumber());
System.out.println("System ID: " + e.getSystemId());
}
}
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