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 package org.apache.bcel.classfile;
18
19 import java.io.DataInput;
20 import java.io.IOException;
21
22 import org.apache.bcel.Const;
23
24 /**
25 * This class is derived from the abstract {@link Constant} and represents a reference to a invoke dynamic.
26 *
27 * @see Constant
28 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.4.10"> The
29 * CONSTANT_InvokeDynamic_info Structure in The Java Virtual Machine Specification</a>
30 * @since 6.0
31 */
32 public final class ConstantInvokeDynamic extends ConstantCP {
33
34 /**
35 * Initialize from another object.
36 *
37 * @param c Source to copy.
38 */
39 public ConstantInvokeDynamic(final ConstantInvokeDynamic c) {
40 this(c.getBootstrapMethodAttrIndex(), c.getNameAndTypeIndex());
41 }
42
43 /**
44 * Initialize instance from file data.
45 *
46 * @param file Input stream
47 * @throws IOException if an I/O error occurs.
48 */
49 ConstantInvokeDynamic(final DataInput file) throws IOException {
50 this(file.readUnsignedShort(), file.readUnsignedShort());
51 }
52
53 public ConstantInvokeDynamic(final int bootstrapMethodAttrIndex, final int nameAndTypeIndex) {
54 super(Const.CONSTANT_InvokeDynamic, bootstrapMethodAttrIndex, nameAndTypeIndex);
55 }
56
57 /**
58 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e.,
59 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
60 *
61 * @param v Visitor object
62 */
63 @Override
64 public void accept(final Visitor v) {
65 v.visitConstantInvokeDynamic(this);
66 }
67
68 /**
69 * @return Reference (index) to bootstrap method this constant refers to.
70 *
71 * Note that this method is a functional duplicate of getClassIndex for use by ConstantInvokeDynamic.
72 * @since 6.0
73 */
74 public int getBootstrapMethodAttrIndex() {
75 return super.getClassIndex(); // AKA bootstrap_method_attr_index
76 }
77
78 /**
79 * @return String representation
80 */
81 @Override
82 public String toString() {
83 return super.toString().replace("class_index", "bootstrap_method_attr_index");
84 }
85 }