1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package com.sun.org.apache.bcel.internal.classfile; 23 24 import java.io.DataInput; 25 import java.io.DataOutputStream; 26 import java.io.IOException; 27 28 import com.sun.org.apache.bcel.internal.Const; 29 30 /** 31 * This class is derived from the abstract {@link Constant} 32 * and represents a reference to the name and signature 33 * of a field or method. 34 * 35 * @version $Id: ConstantNameAndType.java 1747278 2016-06-07 17:28:43Z britter $ 36 * @see Constant 37 */ 38 public final class ConstantNameAndType extends Constant { 39 40 private int name_index; // Name of field/method 41 private int signature_index; // and its signature. 42 43 44 /** 45 * Initialize from another object. 46 */ 47 public ConstantNameAndType(final ConstantNameAndType c) { 48 this(c.getNameIndex(), c.getSignatureIndex()); 49 } 50 51 52 /** 53 * Initialize instance from file data. 54 * 55 * @param file Input stream 56 * @throws IOException 57 */ 58 ConstantNameAndType(final DataInput file) throws IOException { 59 this(file.readUnsignedShort(), file.readUnsignedShort()); 60 } 61 62 63 /** 64 * @param name_index Name of field/method 65 * @param signature_index and its signature 66 */ 67 public ConstantNameAndType(final int name_index, final int signature_index) { 68 super(Const.CONSTANT_NameAndType); 69 this.name_index = name_index; 70 this.signature_index = signature_index; 71 } 72 73 74 /** 75 * Called by objects that are traversing the nodes of the tree implicitely 76 * defined by the contents of a Java class. I.e., the hierarchy of methods, 77 * fields, attributes, etc. spawns a tree of objects. 78 * 79 * @param v Visitor object 80 */ 81 @Override 82 public void accept( final Visitor v ) { 83 v.visitConstantNameAndType(this); 84 } 85 86 87 /** 88 * Dump name and signature index to file stream in binary format. 89 * 90 * @param file Output file stream 91 * @throws IOException 92 */ 93 @Override 94 public final void dump( final DataOutputStream file ) throws IOException { 95 file.writeByte(super.getTag()); 96 file.writeShort(name_index); 97 file.writeShort(signature_index); 98 } 99 100 101 /** 102 * @return Name index in constant pool of field/method name. 103 */ 104 public final int getNameIndex() { 105 return name_index; 106 } 107 108 109 /** @return name 110 */ 111 public final String getName( final ConstantPool cp ) { 112 return cp.constantToString(getNameIndex(), Const.CONSTANT_Utf8); 113 } 114 115 116 /** 117 * @return Index in constant pool of field/method signature. 118 */ 119 public final int getSignatureIndex() { 120 return signature_index; 121 } 122 123 124 /** @return signature 125 */ 126 public final String getSignature( final ConstantPool cp ) { 127 return cp.constantToString(getSignatureIndex(), Const.CONSTANT_Utf8); 128 } 129 130 131 /** 132 * @param name_index the name index of this constant 133 */ 134 public final void setNameIndex( final int name_index ) { 135 this.name_index = name_index; 136 } 137 138 139 /** 140 * @param signature_index the signature index in the constant pool of this type 141 */ 142 public final void setSignatureIndex( final int signature_index ) { 143 this.signature_index = signature_index; 144 } 145 146 147 /** 148 * @return String representation 149 */ 150 @Override 151 public final String toString() { 152 return super.toString() + "(name_index = " + name_index + ", signature_index = " 153 + signature_index + ")"; 154 } 155 }