/*
 * Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package kdp.classparser.attributes;

import kdp.classparser.attributes.*;

import java.io.*;

/**
 * Represents a single entry in the ExceptionsAttribute's 
 * exception table.
 *
 * @author             Aaron Dietrich
 * @version            $Id: ExceptionTable.java,v 1.1.1.1 2000/07/07 13:34:23 jrv Exp $
 *
 * Revision History
 *   $Log: ExceptionTable.java,v $
 *   Revision 1.1.1.1  2000/07/07 13:34:23  jrv
 *   Initial import of kdp code
 *
 *   Revision 1.1.1.1  2000/05/31 19:14:48  ritsun
 *   Initial import of kvmdt to CVS
 *
 *   Revision 1.1  2000/04/25 00:30:39  ritsun
 *   Initial revision
 *
 */
public class ExceptionTable
  {
   /** index into the code array which denotes the
       location the exception handler becomes active */    
   private int            startPC;
   /** index into the code array which denotes the
       location the exception handler ceases to be active */
   private int            endPC;
   /** index into the code array denoting the start of
       the exception handler */
   private int            handlerPC;
   /** index into the constant pool table identifying
       the class of exceptions this exception handler
       is designed to catch */
   private int            catchType;
   
   /** 
    * Constructor.  Reads an ExceptionTable from the specified
    * data source.
    *
    * @param        iStream            source of the ExceptionTable
    *
    * @exception    IOException        pass IOExceptions up
    */
   public ExceptionTable (DataInputStream iStream) throws IOException
     {
      //read in all the fields from the DataInputStream
      startPC = iStream.readUnsignedShort ();
      endPC = iStream.readUnsignedShort ();
      handlerPC = iStream.readUnsignedShort ();
      catchType = iStream.readUnsignedShort ();
     }
   
   /**
    * Returns the contents of the ExceptionTable as a
    * String in an easy to read format.
    *
    * @return        String            the contents of the exception
    *                            table as a String
    */  
   public String toString ()
     {
      return ("Exception Table:\n\tstartPC=" + startPC +
                "\n\tendPC=" + endPC + "\n\thandlerPC=" + 
                handlerPC + "\n\tcatchType=" + catchType);
     }
  }