Mega Code Archive
Using DOM for Syntax Checking
<![CDATA[
//Example XML document
/*
An XML Document Containing a Simple Contact List
Start example
<?xml version="1.0" standalone="yes"?>
<folks>
<person>
<phone>306 555-9999</phone>
<email>joe@webserver.net</email>
<name>Wang, Joe</name>
</person>
<person>
<phone>704 555-0000</phone>
<name>Pet, Rob</name>
<email>rob@server.com</email>
</person>
</folks>
*/
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public class DOMCheck {
static public void main(String[] arg) {
String filename = null;
boolean validate = false;
if(arg.length == 1) {
filename = arg[0];
} else if(arg.length == 2) {
if(!arg[0].equals("-v"))
usage();
validate = true;
filename = arg[1];
} else {
usage();
}
// Create a new factory to create parsers that will
// be aware of namespaces and will validate or
// not according to the flag setting.
DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance();
dbf.setValidating(validate);
dbf.setNamespaceAware(true);
// Use the factory to create a parser (builder) and use
// it to parse the document.
try {
DocumentBuilder builder = dbf.newDocumentBuilder();
builder.setErrorHandler(new MyErrorHandler());
InputSource is = new InputSource(filename);
Document doc = builder.parse(is);
} catch (SAXException e) {
System.exit(1);
} catch (ParserConfigurationException e) {
System.err.println(e);
System.exit(1);
} catch (IOException e) {
System.err.println(e);
System.exit(1);
}
}
private static void usage() {
System.err.println("Usage: DOMCheck [-v] <filename>");
System.exit(1);
}
}
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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