1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.classfile; 19 20 import java.io.DataInput; 21 import java.io.DataOutputStream; 22 import java.io.IOException; 23 24 import org.apache.bcel.Const; 25 26 /** 27 * This class is derived from the abstract {@link Constant} 28 * and represents a reference to a method handle. 29 * 30 * @see Constant 31 * @since 6.0 32 */ 33 public final class ConstantMethodHandle extends Constant { 34 35 private int reference_kind; 36 private int reference_index; 37 38 39 /** 40 * Initialize from another object. 41 */ ConstantMethodHandle(final ConstantMethodHandle c)42 public ConstantMethodHandle(final ConstantMethodHandle c) { 43 this(c.getReferenceKind(), c.getReferenceIndex()); 44 } 45 46 47 /** 48 * Initialize instance from file data. 49 * 50 * @param file Input stream 51 * @throws IOException 52 */ ConstantMethodHandle(final DataInput file)53 ConstantMethodHandle(final DataInput file) throws IOException { 54 this(file.readUnsignedByte(), file.readUnsignedShort()); 55 } 56 57 ConstantMethodHandle(final int reference_kind, final int reference_index)58 public ConstantMethodHandle(final int reference_kind, final int reference_index) { 59 super(Const.CONSTANT_MethodHandle); 60 this.reference_kind = reference_kind; 61 this.reference_index = reference_index; 62 } 63 64 65 /** 66 * Called by objects that are traversing the nodes of the tree implicitly 67 * defined by the contents of a Java class. I.e., the hierarchy of methods, 68 * fields, attributes, etc. spawns a tree of objects. 69 * 70 * @param v Visitor object 71 */ 72 @Override accept( final Visitor v )73 public void accept( final Visitor v ) { 74 v.visitConstantMethodHandle(this); 75 } 76 77 78 /** 79 * Dump method kind and index to file stream in binary format. 80 * 81 * @param file Output file stream 82 * @throws IOException 83 */ 84 @Override dump( final DataOutputStream file )85 public final void dump( final DataOutputStream file ) throws IOException { 86 file.writeByte(super.getTag()); 87 file.writeByte(reference_kind); 88 file.writeShort(reference_index); 89 } 90 91 getReferenceKind()92 public int getReferenceKind() { 93 return reference_kind; 94 } 95 96 setReferenceKind(final int reference_kind)97 public void setReferenceKind(final int reference_kind) { 98 this.reference_kind = reference_kind; 99 } 100 101 getReferenceIndex()102 public int getReferenceIndex() { 103 return reference_index; 104 } 105 106 setReferenceIndex(final int reference_index)107 public void setReferenceIndex(final int reference_index) { 108 this.reference_index = reference_index; 109 } 110 111 112 /** 113 * @return String representation 114 */ 115 @Override toString()116 public final String toString() { 117 return super.toString() + "(reference_kind = " + reference_kind + 118 ", reference_index = " + reference_index + ")"; 119 } 120 } 121