DOMCheck.java Source code

Introduction

Here is the source code for DOMCheck.java

Source

//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());
    }
}