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