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package com.sun.jdo.api.persistence.enhancer.classfile;

import java.io.*;
import java.util.Vector;
import java.util.Enumeration;

/**
 * ExceptionTable represents the exception handlers within the code
 * of a method.
 */

public class ExceptionTable {
  /* A variable length list of ExceptionRange objects */
  private Vector theVector = new Vector();

  /* public accessors */

  /**
   * Return an enumeration of the exception handlers
   * Each element in the enumeration is an ExceptionRange
   */
  public Enumeration handlers() {
    return theVector.elements();
  }

  /**
   * Add an exception handler to the list
   */
  public void addElement(ExceptionRange range) {
    theVector.addElement(range);
  }

  public ExceptionTable() { }

  /* package local methods */

  static ExceptionTable read(DataInputStream data, CodeEnv env)
    throws IOException {
    ExceptionTable excTable = new ExceptionTable();
    int nExcepts = data.readUnsignedShort();
    while (nExcepts-- > 0) {
      excTable.addElement(ExceptionRange.read(data, env));
    }
    return excTable;
  }

  void write(DataOutputStream out) throws IOException {
    out.writeShort(theVector.size());
    for (int i=0; i