package xid;

import org.xml.sax.*;
import java.util.*;

/**
 * Extract from org.xml.sax Interface ErrorHandler:
 * "If a SAX application needs to implement customized error handling,
 * it must implement this interface and then register an instance with
 * the XML reader using the setErrorHandler  method. The parser will
 * then report all errors and warnings through this interface."
 *
 */
public class ParserErrorHandler implements ErrorHandler
{
  Vector<String> messages;
  int fatalErrorsCount;
  int errorsCount;
  int warningCount;
  
  public ParserErrorHandler ()
  {
    fatalErrorsCount = 0;
    errorsCount = 0;
    warningCount = 0;
    messages = new Vector<String> ();
  }
  

  /**
   *
   */
  public int fatalErrorsCount ()
  {
    int result;

    result = this.fatalErrorsCount;

    //
    return (result);
  }

  /**
   *
   */
  public int errorsCount ()
  {
    int result;

    result = this.errorsCount;

    //
    return (result);
  }

  /**
   *
   */
  public int warningCount ()
  {
    int result;

    result = this.warningCount;

    //
    return (result);
  }

  /**
   *
   */
  public int allErrorsCount ()
  {
    int result;

    result = fatalErrorsCount () + errorsCount () + warningCount ();

    //
    return (result);
  }

  /**
   *
   */
  public boolean hasError ()
  {
    boolean result;

    if (allErrorsCount () == 0)
      {
	result = false;
      }
    else
      {
	result = true;
      }

    //
    return (result);
  }


  /**
   * Called by the XML parser to handle fatal errors.
   * @param ex Parse Excpetion. Contains the warning text and the line number.
   */
  public void error (SAXParseException exception)
  {
    String message = "Error at line " + exception.getLineNumber() + " : " + exception.getMessage();

    this.errorsCount += 1;
    this.messages.add (message);
  }
  
  /**
   * Called by the XML parser to handle fatal errors.
   * @param ex Parse Excpetion. Contains the error text and the line number.
   * When a fatal parse error occurs, the parse does not return a document.
   */
  public void fatalError (SAXParseException exception)
  {
    String message = "Fatal error at line " + exception.getLineNumber() + " : " + exception.getMessage();
    
    this.fatalErrorsCount += 1;
    this.messages.add (message);
  }
  
  /**
   * Called by the XML parser to handle warnings.
   * @param ex Parse Excpetion. Contains the warning text and the line number.
   */
  public void warning(SAXParseException exception)
  {
    String message = "Warning at line " + exception.getLineNumber() + " : " + exception.getMessage();
    
    this.warningCount += 1;
    this.messages.add (message);
  }


  /**
   *
   */
  public String toString ()
  {
    StringBuffer result;

    result = new StringBuffer ();

    for (String message : messages)
      {
	result.append (message);
	result.append ('\n');
      }

    //
    return (result.toString ());
  }
}