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