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Java example source code file (CodeException.java)

This example Java source code file (CodeException.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

any, cloneable, codeexception, constant_class, constants, ioexception, node, range, serializable, starting, string

The CodeException.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
package com.sun.org.apache.bcel.internal.classfile;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import  com.sun.org.apache.bcel.internal.Constants;
import  java.io.*;

/**
 * This class represents an entry in the exception table of the <em>Code
 * attribute and is used only there. It contains a range in which a
 * particular exception handler is active.
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
 * @see     Code
 */
public final class CodeException
  implements Cloneable, Constants, Node, Serializable
{
  private int start_pc;   // Range in the code the exception handler is
  private int end_pc;     // active. start_pc is inclusive, end_pc exclusive
  private int handler_pc; /* Starting address of exception handler, i.e.,
                           * an offset from start of code.
                           */
  private int catch_type; /* If this is zero the handler catches any
                           * exception, otherwise it points to the
                           * exception class which is to be caught.
                           */
  /**
   * Initialize from another object.
   */
  public CodeException(CodeException c) {
    this(c.getStartPC(), c.getEndPC(), c.getHandlerPC(), c.getCatchType());
  }

  /**
   * Construct object from file stream.
   * @param file Input stream
   * @throws IOException
   */
  CodeException(DataInputStream file) throws IOException
  {
    this(file.readUnsignedShort(), file.readUnsignedShort(),
         file.readUnsignedShort(), file.readUnsignedShort());
  }

  /**
   * @param start_pc Range in the code the exception handler is active,
   * start_pc is inclusive while
   * @param end_pc is exclusive
   * @param handler_pc Starting address of exception handler, i.e.,
   * an offset from start of code.
   * @param catch_type If zero the handler catches any
   * exception, otherwise it points to the exception class which is
   * to be caught.
   */
  public CodeException(int start_pc, int end_pc, int handler_pc,
                       int catch_type)
  {
    this.start_pc   = start_pc;
    this.end_pc     = end_pc;
    this.handler_pc = handler_pc;
    this.catch_type = catch_type;
  }

  /**
   * Called by objects that are traversing the nodes of the tree implicitely
   * defined by the contents of a Java class. I.e., the hierarchy of methods,
   * fields, attributes, etc. spawns a tree of objects.
   *
   * @param v Visitor object
   */
  public void accept(Visitor v) {
    v.visitCodeException(this);
  }
  /**
   * Dump code exception to file stream in binary format.
   *
   * @param file Output file stream
   * @throws IOException
   */
  public final void dump(DataOutputStream file) throws IOException
  {
    file.writeShort(start_pc);
    file.writeShort(end_pc);
    file.writeShort(handler_pc);
    file.writeShort(catch_type);
  }

  /**
   * @return 0, if the handler catches any exception, otherwise it points to
   * the exception class which is to be caught.
   */
  public final int getCatchType() { return catch_type; }

  /**
   * @return Exclusive end index of the region where the handler is active.
   */
  public final int getEndPC() { return end_pc; }

  /**
   * @return Starting address of exception handler, relative to the code.
   */
  public final int getHandlerPC() { return handler_pc; }

  /**
   * @return Inclusive start index of the region where the handler is active.
   */
  public final int getStartPC() { return start_pc; }

  /**
   * @param catch_type.
   */
  public final void setCatchType(int catch_type) {
    this.catch_type = catch_type;
  }

  /**
   * @param end_pc end of handled block
   */
  public final void setEndPC(int end_pc) {
    this.end_pc = end_pc;
  }

  /**
   * @param handler_pc where the actual code is
   */
  public final void setHandlerPC(int handler_pc) {
    this.handler_pc = handler_pc;
  }

  /**
   * @param start_pc start of handled block
   */
  public final void setStartPC(int start_pc) {
    this.start_pc = start_pc;
  }

  /**
   * @return String representation.
   */
  public final String toString() {
    return "CodeException(start_pc = " + start_pc +
      ", end_pc = " + end_pc +
      ", handler_pc = " + handler_pc + ", catch_type = " + catch_type + ")";
  }

  /**
   * @return String representation.
   */
  public final String toString(ConstantPool cp, boolean verbose) {
    String str;

    if(catch_type == 0)
      str = "<Any exception>(0)";
    else
      str = Utility.compactClassName(cp.getConstantString(catch_type, CONSTANT_Class), false) +
        (verbose? "(" + catch_type + ")" : "");

    return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str;
  }

  public final String toString(ConstantPool cp) {
    return toString(cp, true);
  }

  /**
   * @return deep copy of this object
   */
  public CodeException copy() {
    try {
      return (CodeException)clone();
    } catch(CloneNotSupportedException e) {}

    return null;
  }
}

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