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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.IOException;
22 
23 import org.apache.bcel.Const;
24 
25 /**
26  * This class is derived from the abstract {@link Constant}
27  * and represents a reference to a invoke dynamic.
28  *
29  * @see     Constant
30  * @see  <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.4.10">
31  * The CONSTANT_InvokeDynamic_info Structure in The Java Virtual Machine Specification</a>
32  * @since 6.0
33  */
34 public final class ConstantInvokeDynamic extends ConstantCP {
35 
36     /**
37      * Initialize from another object.
38      */
ConstantInvokeDynamic(final ConstantInvokeDynamic c)39     public ConstantInvokeDynamic(final ConstantInvokeDynamic c) {
40         this(c.getBootstrapMethodAttrIndex(), c.getNameAndTypeIndex());
41     }
42 
43 
44     /**
45      * Initialize instance from file data.
46      *
47      * @param file Input stream
48      * @throws IOException
49      */
ConstantInvokeDynamic(final DataInput file)50     ConstantInvokeDynamic(final DataInput file) throws IOException {
51         this(file.readShort(), file.readShort());
52     }
53 
54 
ConstantInvokeDynamic(final int bootstrap_method_attr_index, final int name_and_type_index)55     public ConstantInvokeDynamic(final int bootstrap_method_attr_index, final int name_and_type_index) {
56         super(Const.CONSTANT_InvokeDynamic, bootstrap_method_attr_index, name_and_type_index);
57     }
58 
59 
60     /**
61      * Called by objects that are traversing the nodes of the tree implicitly
62      * defined by the contents of a Java class. I.e., the hierarchy of methods,
63      * fields, attributes, etc. spawns a tree of objects.
64      *
65      * @param v Visitor object
66      */
67     @Override
accept( final Visitor v )68     public void accept( final Visitor v ) {
69         v.visitConstantInvokeDynamic(this);
70     }
71 
72     /**
73      * @return Reference (index) to bootstrap method this constant refers to.
74      *
75      * Note that this method is a functional duplicate of getClassIndex
76      * for use by ConstantInvokeDynamic.
77      * @since 6.0
78      */
getBootstrapMethodAttrIndex()79     public final int getBootstrapMethodAttrIndex() {
80         return super.getClassIndex();  // AKA bootstrap_method_attr_index
81     }
82 
83     /**
84      * @return String representation
85      */
86     @Override
toString()87     public final String toString() {
88         return super.toString().replace("class_index", "bootstrap_method_attr_index");
89     }
90 }
91