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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 a (external) class. 64 * 65 * @version $Id: ConstantClass.java,v 1.3 2002/03/11 16:16:35 mdahm Exp $ 66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 67 * @see Constant 68 */ 69 public final class ConstantClass extends Constant implements ConstantObject { 70 private int name_index; // Identical to ConstantString except for the name 71 72 /*** 73 * Initialize from another object. 74 */ 75 public ConstantClass(ConstantClass c) { 76 this(c.getNameIndex()); 77 } 78 79 /*** 80 * Initialize instance from file data. 81 * 82 * @param file Input stream 83 * @throws IOException 84 */ 85 ConstantClass(DataInputStream file) throws IOException 86 { 87 this(file.readUnsignedShort()); 88 } 89 90 /*** 91 * @param name_index Name index in constant pool. Should refer to a 92 * ConstantUtf8. 93 */ 94 public ConstantClass(int name_index) { 95 super(Constants.CONSTANT_Class); 96 this.name_index = name_index; 97 } 98 99 /*** 100 * Called by objects that are traversing the nodes of the tree implicitely 101 * defined by the contents of a Java class. I.e., the hierarchy of methods, 102 * fields, attributes, etc. spawns a tree of objects. 103 * 104 * @param v Visitor object 105 */ 106 public void accept(Visitor v) { 107 v.visitConstantClass(this); 108 } 109 110 /*** 111 * Dump constant class to file stream in binary format. 112 * 113 * @param file Output file stream 114 * @throws IOException 115 */ 116 public final void dump(DataOutputStream file) throws IOException 117 { 118 file.writeByte(tag); 119 file.writeShort(name_index); 120 } 121 122 /*** 123 * @return Name index in constant pool of class name. 124 */ 125 public final int getNameIndex() { return name_index; } 126 127 /*** 128 * @param name_index. 129 */ 130 public final void setNameIndex(int name_index) { 131 this.name_index = name_index; 132 } 133 134 135 /*** @return String object 136 */ 137 public Object getConstantValue(ConstantPool cp) { 138 Constant c = cp.getConstant(name_index, Constants.CONSTANT_Utf8); 139 return ((ConstantUtf8)c).getBytes(); 140 } 141 142 /*** @return dereferenced string 143 */ 144 public String getBytes(ConstantPool cp) { 145 return (String)getConstantValue(cp); 146 } 147 148 /*** 149 * @return String representation. 150 */ 151 public final String toString() { 152 return super.toString() + "(name_index = " + name_index + ")"; 153 } 154 }

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