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    1   package org.apache.bcel.generic;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56  import java.io.*;
    57  import org.apache.bcel.util.ByteSequence;
    58
    59  /***
    60   * LOOKUPSWITCH - Switch with unordered set of values
    61   *
    62   * @version $Id: LOOKUPSWITCH.java,v 1.1.1.1 2001/10/29 20:00:22 jvanzyl Exp $
    63   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    64   * @see SWITCH
    65   */
    66  public class LOOKUPSWITCH extends Select {
    67    /***
    68     * Empty constructor needed for the Class.newInstance() statement in
    69     * Instruction.readInstruction(). Not to be used otherwise.
    70     */
    71    LOOKUPSWITCH() {}
    72
    73    public LOOKUPSWITCH(int[] match, InstructionHandle[] targets,
    74  		      InstructionHandle target) {
    75      super(org.apache.bcel.Constants.LOOKUPSWITCH, match, targets, target);
    76
    77      length = (short)(9 + match_length * 8); /* alignment remainder assumed
    78  					     * 0 here, until dump time. */
    79      fixed_length = length;
    80    }
    81
    82    /***
    83     * Dump instruction as byte code to stream out.
    84     * @param out Output stream
    85     */
    86    public void dump(DataOutputStream out) throws IOException {
    87      super.dump(out);
    88      out.writeInt(match_length);       // npairs
    89
    90      for(int i=0; i < match_length; i++) {
    91        out.writeInt(match[i]);         // match-offset pairs
    92        out.writeInt(indices[i] = getTargetOffset(targets[i]));
    93      }
    94    }
    95
    96    /***
    97     * Read needed data (e.g. index) from file.
    98     */
    99    protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
    100   {
    101     super.initFromFile(bytes, wide); // reads padding
    102
    103     match_length = bytes.readInt();
    104     fixed_length = (short)(9 + match_length * 8);
    105     length       = (short)(fixed_length + padding);
    106
    107     match   = new int[match_length];
    108     indices = new int[match_length];
    109     targets = new InstructionHandle[match_length];
    110
    111     for(int i=0; i < match_length; i++) {
    112       match[i]   = bytes.readInt();
    113       indices[i] = bytes.readInt();
    114     }
    115   }
    116
    117
    118   /***
    119    * Call corresponding visitor method(s). The order is:
    120    * Call visitor methods of implemented interfaces first, then
    121    * call methods according to the class hierarchy in descending order,
    122    * i.e., the most specific visitXXX() call comes last.
    123    *
    124    * @param v Visitor object
    125    */
    126   public void accept(Visitor v) {
    127     v.visitVariableLengthInstruction(this);
    128     v.visitStackProducer(this);
    129     v.visitBranchInstruction(this);
    130     v.visitSelect(this);
    131     v.visitLOOKUPSWITCH(this);
    132   }
    133 }

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