1 /*
2  * reserved comment block
3  * DO NOT REMOVE OR ALTER!
4  */
5 package com.sun.org.apache.bcel.internal.generic;
6 
7 /* ====================================================================
8  * The Apache Software License, Version 1.1
9  *
10  * Copyright (c) 2001 The Apache Software Foundation.  All rights
11  * reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  *
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  *
20  * 2. Redistributions in binary form must reproduce the above copyright
21  *    notice, this list of conditions and the following disclaimer in
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25  * 3. The end-user documentation included with the redistribution,
26  *    if any, must include the following acknowledgment:
27  *       "This product includes software developed by the
28  *        Apache Software Foundation (http://www.apache.org/)."
29  *    Alternately, this acknowledgment may appear in the software itself,
30  *    if and wherever such third-party acknowledgments normally appear.
31  *
32  * 4. The names "Apache" and "Apache Software Foundation" and
33  *    "Apache BCEL" must not be used to endorse or promote products
34  *    derived from this software without prior written permission. For
35  *    written permission, please contact apache@apache.org.
36  *
37  * 5. Products derived from this software may not be called "Apache",
38  *    "Apache BCEL", nor may "Apache" appear in their name, without
39  *    prior written permission of the Apache Software Foundation.
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41  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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55  * This software consists of voluntary contributions made by many
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58  * <http://www.apache.org/>.
59  */
60 import java.io.*;
61 import com.sun.org.apache.bcel.internal.util.ByteSequence;
62 
63 /**
64  * LOOKUPSWITCH - Switch with unordered set of values
65  *
66  * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67  * @see SWITCH
68  */
69 public class LOOKUPSWITCH extends Select {
70   /**
71    * Empty constructor needed for the Class.newInstance() statement in
72    * Instruction.readInstruction(). Not to be used otherwise.
73    */
LOOKUPSWITCH()74   LOOKUPSWITCH() {}
75 
LOOKUPSWITCH(int[] match, InstructionHandle[] targets, InstructionHandle target)76   public LOOKUPSWITCH(int[] match, InstructionHandle[] targets,
77                       InstructionHandle target) {
78     super(com.sun.org.apache.bcel.internal.Constants.LOOKUPSWITCH, match, targets, target);
79 
80     length = (short)(9 + match_length * 8); /* alignment remainder assumed
81                                              * 0 here, until dump time. */
82     fixed_length = length;
83   }
84 
85   /**
86    * Dump instruction as byte code to stream out.
87    * @param out Output stream
88    */
dump(DataOutputStream out)89   public void dump(DataOutputStream out) throws IOException {
90     super.dump(out);
91     out.writeInt(match_length);       // npairs
92 
93     for(int i=0; i < match_length; i++) {
94       out.writeInt(match[i]);         // match-offset pairs
95       out.writeInt(indices[i] = getTargetOffset(targets[i]));
96     }
97   }
98 
99   /**
100    * Read needed data (e.g. index) from file.
101    */
initFromFile(ByteSequence bytes, boolean wide)102   protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException
103   {
104     super.initFromFile(bytes, wide); // reads padding
105 
106     match_length = bytes.readInt();
107     fixed_length = (short)(9 + match_length * 8);
108     length       = (short)(fixed_length + padding);
109 
110     match   = new int[match_length];
111     indices = new int[match_length];
112     targets = new InstructionHandle[match_length];
113 
114     for(int i=0; i < match_length; i++) {
115       match[i]   = bytes.readInt();
116       indices[i] = bytes.readInt();
117     }
118   }
119 
120 
121   /**
122    * Call corresponding visitor method(s). The order is:
123    * Call visitor methods of implemented interfaces first, then
124    * call methods according to the class hierarchy in descending order,
125    * i.e., the most specific visitXXX() call comes last.
126    *
127    * @param v Visitor object
128    */
accept(Visitor v)129   public void accept(Visitor v) {
130     v.visitVariableLengthInstruction(this);
131     v.visitStackProducer(this);
132     v.visitBranchInstruction(this);
133     v.visitSelect(this);
134     v.visitLOOKUPSWITCH(this);
135   }
136 }
137