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 public ConstantMethodType(final ConstantMethodType c) { 039 this(c.getDescriptorIndex()); 040 } 041 042 /** 043 * Initialize instance from file data. 044 * 045 * @param file Input stream 046 * @throws IOException if an I/O error occurs. 047 */ 048 ConstantMethodType(final DataInput file) throws IOException { 049 this(file.readUnsignedShort()); 050 } 051 052 public ConstantMethodType(final int descriptorIndex) { 053 super(Const.CONSTANT_MethodType); 054 this.descriptorIndex = descriptorIndex; 055 } 056 057 /** 058 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., 059 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects. 060 * 061 * @param v Visitor object 062 */ 063 @Override 064 public void accept(final Visitor v) { 065 v.visitConstantMethodType(this); 066 } 067 068 /** 069 * Dump name and signature index to file stream in binary format. 070 * 071 * @param file Output file stream 072 * @throws IOException if an I/O error occurs. 073 */ 074 @Override 075 public void dump(final DataOutputStream file) throws IOException { 076 file.writeByte(super.getTag()); 077 file.writeShort(descriptorIndex); 078 } 079 080 public int getDescriptorIndex() { 081 return descriptorIndex; 082 } 083 084 public void setDescriptorIndex(final int descriptorIndex) { 085 this.descriptorIndex = descriptorIndex; 086 } 087 088 /** 089 * @return String representation 090 */ 091 @Override 092 public String toString() { 093 return super.toString() + "(descriptorIndex = " + descriptorIndex + ")"; 094 } 095}