001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.bcel.classfile; 018 019import java.io.DataInput; 020import java.io.IOException; 021 022import org.apache.bcel.Const; 023 024/** 025 * This class is derived from the abstract {@link Constant} and represents a reference to a invoke dynamic. 026 * 027 * @see Constant 028 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.4.10"> The 029 * CONSTANT_InvokeDynamic_info Structure in The Java Virtual Machine Specification</a> 030 * @since 6.0 031 */ 032public final class ConstantInvokeDynamic extends ConstantCP { 033 034 /** 035 * Initialize from another object. 036 */ 037 public ConstantInvokeDynamic(final ConstantInvokeDynamic c) { 038 this(c.getBootstrapMethodAttrIndex(), c.getNameAndTypeIndex()); 039 } 040 041 /** 042 * Initialize instance from file data. 043 * 044 * @param file Input stream 045 * @throws IOException if an I/O error occurs. 046 */ 047 ConstantInvokeDynamic(final DataInput file) throws IOException { 048 this(file.readShort(), file.readShort()); 049 } 050 051 public ConstantInvokeDynamic(final int bootstrapMethodAttrIndex, final int nameAndTypeIndex) { 052 super(Const.CONSTANT_InvokeDynamic, bootstrapMethodAttrIndex, nameAndTypeIndex); 053 } 054 055 /** 056 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., 057 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects. 058 * 059 * @param v Visitor object 060 */ 061 @Override 062 public void accept(final Visitor v) { 063 v.visitConstantInvokeDynamic(this); 064 } 065 066 /** 067 * @return Reference (index) to bootstrap method this constant refers to. 068 * 069 * Note that this method is a functional duplicate of getClassIndex for use by ConstantInvokeDynamic. 070 * @since 6.0 071 */ 072 public int getBootstrapMethodAttrIndex() { 073 return super.getClassIndex(); // AKA bootstrap_method_attr_index 074 } 075 076 /** 077 * @return String representation 078 */ 079 @Override 080 public String toString() { 081 return super.toString().replace("class_index", "bootstrap_method_attr_index"); 082 } 083}