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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