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1 package org.apache.bcel.classfile; 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 57 import org.apache.bcel.Constants; 58 import java.io.*; 59 60 /*** 61 * This class is derived from the abstract 62 * <A HREF="org.apache.bcel.classfile.Constant.html">Constant</A> class 63 * and represents a reference to the name and signature 64 * of a field or method. 65 * 66 * @version $Id: ConstantNameAndType.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $ 67 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 68 * @see Constant 69 */ 70 public final class ConstantNameAndType extends Constant { 71 private int name_index; // Name of field/method 72 private int signature_index; // and its signature. 73 74 /*** 75 * Initialize from another object. 76 */ 77 public ConstantNameAndType(ConstantNameAndType c) { 78 this(c.getNameIndex(), c.getSignatureIndex()); 79 } 80 81 /*** 82 * Initialize instance from file data. 83 * 84 * @param file Input stream 85 * @throws IOException 86 */ 87 ConstantNameAndType(DataInputStream file) throws IOException 88 { 89 this((int)file.readUnsignedShort(), (int)file.readUnsignedShort()); 90 } 91 92 /*** 93 * @param name_index Name of field/method 94 * @param signature_index and its signature 95 */ 96 public ConstantNameAndType(int name_index, 97 int signature_index) 98 { 99 super(Constants.CONSTANT_NameAndType); 100 this.name_index = name_index; 101 this.signature_index = signature_index; 102 } 103 104 /*** 105 * Called by objects that are traversing the nodes of the tree implicitely 106 * defined by the contents of a Java class. I.e., the hierarchy of methods, 107 * fields, attributes, etc. spawns a tree of objects. 108 * 109 * @param v Visitor object 110 */ 111 public void accept(Visitor v) { 112 v.visitConstantNameAndType(this); 113 } 114 115 /*** 116 * Dump name and signature index to file stream in binary format. 117 * 118 * @param file Output file stream 119 * @throws IOException 120 */ 121 public final void dump(DataOutputStream file) throws IOException 122 { 123 file.writeByte(tag); 124 file.writeShort(name_index); 125 file.writeShort(signature_index); 126 } 127 128 /*** 129 * @return Name index in constant pool of field/method name. 130 */ 131 public final int getNameIndex() { return name_index; } 132 133 /*** @return name 134 */ 135 public final String getName(ConstantPool cp) { 136 return cp.constantToString(getNameIndex(), Constants.CONSTANT_Utf8); 137 } 138 139 /*** 140 * @return Index in constant pool of field/method signature. 141 */ 142 public final int getSignatureIndex() { return signature_index; } 143 144 /*** @return signature 145 */ 146 public final String getSignature(ConstantPool cp) { 147 return cp.constantToString(getSignatureIndex(), Constants.CONSTANT_Utf8); 148 } 149 150 /*** 151 * @param name_index. 152 */ 153 public final void setNameIndex(int name_index) { 154 this.name_index = name_index; 155 } 156 157 /*** 158 * @param signature_index. 159 */ 160 public final void setSignatureIndex(int signature_index) { 161 this.signature_index = signature_index; 162 } 163 164 /*** 165 * @return String representation 166 */ 167 public final String toString() { 168 return super.toString() + "(name_index = " + name_index + 169 ", signature_index = " + signature_index + ")"; 170 } 171 }

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