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 type.
29 *
30 * @see Constant
31 * @since 6.0
32 */
33 public final class ConstantMethodType extends Constant {
34
35 private int descriptorIndex;
36
37 /**
38 * Initialize from another object.
39 *
40 * @param c Source to copy.
41 */
42 public ConstantMethodType(final ConstantMethodType c) {
43 this(c.getDescriptorIndex());
44 }
45
46 /**
47 * Initialize instance from file data.
48 *
49 * @param file Input stream.
50 * @throws IOException if an I/O error occurs.
51 */
52 ConstantMethodType(final DataInput file) throws IOException {
53 this(file.readUnsignedShort());
54 }
55
56 /**
57 * Constructs a ConstantMethodType.
58 *
59 * @param descriptorIndex Index to the method descriptor.
60 */
61 public ConstantMethodType(final int descriptorIndex) {
62 super(Const.CONSTANT_MethodType);
63 this.descriptorIndex = descriptorIndex;
64 }
65
66 /**
67 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e.,
68 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
69 *
70 * @param v Visitor object.
71 */
72 @Override
73 public void accept(final Visitor v) {
74 v.visitConstantMethodType(this);
75 }
76
77 /**
78 * Dumps name and signature index to file stream in binary format.
79 *
80 * @param file Output file stream.
81 * @throws IOException if an I/O error occurs.
82 */
83 @Override
84 public void dump(final DataOutputStream file) throws IOException {
85 file.writeByte(super.getTag());
86 file.writeShort(descriptorIndex);
87 }
88
89 /**
90 * Gets the descriptor index.
91 *
92 * @return the descriptor index.
93 */
94 public int getDescriptorIndex() {
95 return descriptorIndex;
96 }
97
98 /**
99 * Sets the descriptor index.
100 *
101 * @param descriptorIndex the descriptor index.
102 */
103 public void setDescriptorIndex(final int descriptorIndex) {
104 this.descriptorIndex = descriptorIndex;
105 }
106
107 /**
108 * @return String representation.
109 */
110 @Override
111 public String toString() {
112 return super.toString() + "(descriptorIndex = " + descriptorIndex + ")";
113 }
114 }