Source Code : SAX Checker

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SAX Checker

      
//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.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

public class SAXCheck {
  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
    // validate or not, according to the flag setting.
    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setValidating(validate);

    // Create the XMLReader to be used to check for errors.
    XMLReader reader = null;
    try {
      SAXParser parser = spf.newSAXParser();
      reader = parser.getXMLReader();
    } catch (Exception e) {
      System.err.println(e);
      System.exit(1);
    }

    // Install an error handler in the reader.
    reader.setErrorHandler(new MyErrorHandler());
    // 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: SAXCheck [-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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