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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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