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 * @see Constant 36 */ 37 public final class ConstantNameAndType extends Constant { 38 39 private int name_index; // Name of field/method 40 private int signature_index; // and its signature. 41 42 43 /** 44 * Initialize from another object. 45 */ ConstantNameAndType(final ConstantNameAndType c)46 public ConstantNameAndType(final ConstantNameAndType c) { 47 this(c.getNameIndex(), c.getSignatureIndex()); 48 } 49 50 51 /** 52 * Initialize instance from file data. 53 * 54 * @param file Input stream 55 * @throws IOException 56 */ ConstantNameAndType(final DataInput file)57 ConstantNameAndType(final DataInput file) throws IOException { 58 this(file.readUnsignedShort(), file.readUnsignedShort()); 59 } 60 61 62 /** 63 * @param name_index Name of field/method 64 * @param signature_index and its signature 65 */ ConstantNameAndType(final int name_index, final int signature_index)66 public ConstantNameAndType(final int name_index, final int signature_index) { 67 super(Const.CONSTANT_NameAndType); 68 this.name_index = name_index; 69 this.signature_index = signature_index; 70 } 71 72 73 /** 74 * Called by objects that are traversing the nodes of the tree implicitely 75 * defined by the contents of a Java class. I.e., the hierarchy of methods, 76 * fields, attributes, etc. spawns a tree of objects. 77 * 78 * @param v Visitor object 79 */ 80 @Override accept( final Visitor v )81 public void accept( final Visitor v ) { 82 v.visitConstantNameAndType(this); 83 } 84 85 86 /** 87 * Dump name and signature index to file stream in binary format. 88 * 89 * @param file Output file stream 90 * @throws IOException 91 */ 92 @Override dump( final DataOutputStream file )93 public void dump( final DataOutputStream file ) throws IOException { 94 file.writeByte(super.getTag()); 95 file.writeShort(name_index); 96 file.writeShort(signature_index); 97 } 98 99 100 /** 101 * @return Name index in constant pool of field/method name. 102 */ getNameIndex()103 public int getNameIndex() { 104 return name_index; 105 } 106 107 108 /** @return name 109 */ getName( final ConstantPool cp )110 public String getName( final ConstantPool cp ) { 111 return cp.constantToString(getNameIndex(), Const.CONSTANT_Utf8); 112 } 113 114 115 /** 116 * @return Index in constant pool of field/method signature. 117 */ getSignatureIndex()118 public int getSignatureIndex() { 119 return signature_index; 120 } 121 122 123 /** @return signature 124 */ getSignature( final ConstantPool cp )125 public String getSignature( final ConstantPool cp ) { 126 return cp.constantToString(getSignatureIndex(), Const.CONSTANT_Utf8); 127 } 128 129 130 /** 131 * @param name_index the name index of this constant 132 */ setNameIndex( final int name_index )133 public void setNameIndex( final int name_index ) { 134 this.name_index = name_index; 135 } 136 137 138 /** 139 * @param signature_index the signature index in the constant pool of this type 140 */ setSignatureIndex( final int signature_index )141 public void setSignatureIndex( final int signature_index ) { 142 this.signature_index = signature_index; 143 } 144 145 146 /** 147 * @return String representation 148 */ 149 @Override toString()150 public String toString() { 151 return super.toString() + "(name_index = " + name_index + ", signature_index = " 152 + signature_index + ")"; 153 } 154 } 155