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.DataOutputStream; 021import java.io.IOException; 022 023import org.apache.bcel.Const; 024 025/** 026 * This class is derived from the abstract {@link Constant} and represents a reference to a method type. 027 * 028 * @see Constant 029 * @since 6.0 030 */ 031public final class ConstantMethodType extends Constant { 032 033 private int descriptorIndex; 034 035 /** 036 * Initialize from another object. 037 * 038 * @param c Source to copy. 039 */ 040 public ConstantMethodType(final ConstantMethodType c) { 041 this(c.getDescriptorIndex()); 042 } 043 044 /** 045 * Initialize instance from file data. 046 * 047 * @param file Input stream 048 * @throws IOException if an I/O error occurs. 049 */ 050 ConstantMethodType(final DataInput file) throws IOException { 051 this(file.readUnsignedShort()); 052 } 053 054 public ConstantMethodType(final int descriptorIndex) { 055 super(Const.CONSTANT_MethodType); 056 this.descriptorIndex = descriptorIndex; 057 } 058 059 /** 060 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., 061 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects. 062 * 063 * @param v Visitor object 064 */ 065 @Override 066 public void accept(final Visitor v) { 067 v.visitConstantMethodType(this); 068 } 069 070 /** 071 * Dump name and signature index to file stream in binary format. 072 * 073 * @param file Output file stream 074 * @throws IOException if an I/O error occurs. 075 */ 076 @Override 077 public void dump(final DataOutputStream file) throws IOException { 078 file.writeByte(super.getTag()); 079 file.writeShort(descriptorIndex); 080 } 081 082 public int getDescriptorIndex() { 083 return descriptorIndex; 084 } 085 086 public void setDescriptorIndex(final int descriptorIndex) { 087 this.descriptorIndex = descriptorIndex; 088 } 089 090 /** 091 * @return String representation 092 */ 093 @Override 094 public String toString() { 095 return super.toString() + "(descriptorIndex = " + descriptorIndex + ")"; 096 } 097}