1. package com.sun.org.apache.bcel.internal.classfile;
  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.Constants;
  57. /**
  58. * Abstract super class for Fieldref and Methodref constants.
  59. *
  60. * @version $Id: ConstantCP.java,v 1.1.1.1 2001/10/29 19:59:58 jvanzyl Exp $
  61. * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  62. * @see ConstantFieldref
  63. * @see ConstantMethodref
  64. * @see ConstantInterfaceMethodref
  65. */
  66. public abstract class ConstantCP extends Constant {
  67. /** References to the constants containing the class and the field signature
  68. */
  69. protected int class_index, name_and_type_index;
  70. /**
  71. * Initialize from another object.
  72. */
  73. public ConstantCP(ConstantCP c) {
  74. this(c.getTag(), c.getClassIndex(), c.getNameAndTypeIndex());
  75. }
  76. /**
  77. * Initialize instance from file data.
  78. *
  79. * @param tag Constant type tag
  80. * @param file Input stream
  81. * @throw IOException
  82. */
  83. ConstantCP(byte tag, DataInputStream file) throws IOException
  84. {
  85. this(tag, file.readUnsignedShort(), file.readUnsignedShort());
  86. }
  87. /**
  88. * @param class_index Reference to the class containing the field
  89. * @param name_and_type_index and the field signature
  90. */
  91. protected ConstantCP(byte tag, int class_index,
  92. int name_and_type_index) {
  93. super(tag);
  94. this.class_index = class_index;
  95. this.name_and_type_index = name_and_type_index;
  96. }
  97. /**
  98. * Dump constant field reference to file stream in binary format.
  99. *
  100. * @param file Output file stream
  101. * @throw IOException
  102. */
  103. public final void dump(DataOutputStream file) throws IOException
  104. {
  105. file.writeByte(tag);
  106. file.writeShort(class_index);
  107. file.writeShort(name_and_type_index);
  108. }
  109. /**
  110. * @return Reference (index) to class this field or method belongs to.
  111. */
  112. public final int getClassIndex() { return class_index; }
  113. /**
  114. * @return Reference (index) to signature of the field.
  115. */
  116. public final int getNameAndTypeIndex() { return name_and_type_index; }
  117. /**
  118. * @param class_index points to Constant_class
  119. */
  120. public final void setClassIndex(int class_index) {
  121. this.class_index = class_index;
  122. }
  123. /**
  124. * @return Class this field belongs to.
  125. */
  126. public String getClass(ConstantPool cp) {
  127. return cp.constantToString(class_index, Constants.CONSTANT_Class);
  128. }
  129. /**
  130. * @param name_and_type_index points to Constant_NameAndType
  131. */
  132. public final void setNameAndTypeIndex(int name_and_type_index) {
  133. this.name_and_type_index = name_and_type_index;
  134. }
  135. /**
  136. * @return String representation.
  137. */
  138. public final String toString() {
  139. return super.toString() + "(class_index = " + class_index +
  140. ", name_and_type_index = " + name_and_type_index + ")";
  141. }
  142. }