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 * 017 */ 018package org.apache.bcel.classfile; 019 020import java.io.DataInput; 021import java.io.DataOutputStream; 022import java.io.IOException; 023 024import org.apache.bcel.Const; 025 026/** 027 * This class is derived from the abstract {@link Constant} and represents a reference to a method type. 028 * 029 * @see Constant 030 * @since 6.0 031 */ 032public final class ConstantMethodType extends Constant { 033 034 private int descriptorIndex; 035 036 /** 037 * Initialize from another object. 038 */ 039 public ConstantMethodType(final ConstantMethodType c) { 040 this(c.getDescriptorIndex()); 041 } 042 043 /** 044 * Initialize instance from file data. 045 * 046 * @param file Input stream 047 * @throws IOException if an I/O error occurs. 048 */ 049 ConstantMethodType(final DataInput file) throws IOException { 050 this(file.readUnsignedShort()); 051 } 052 053 public ConstantMethodType(final int descriptor_index) { 054 super(Const.CONSTANT_MethodType); 055 this.descriptorIndex = descriptor_index; 056 } 057 058 /** 059 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., 060 * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects. 061 * 062 * @param v Visitor object 063 */ 064 @Override 065 public void accept(final Visitor v) { 066 v.visitConstantMethodType(this); 067 } 068 069 /** 070 * Dump name and signature index to file stream in binary format. 071 * 072 * @param file Output file stream 073 * @throws IOException if an I/O error occurs. 074 */ 075 @Override 076 public void dump(final DataOutputStream file) throws IOException { 077 file.writeByte(super.getTag()); 078 file.writeShort(descriptorIndex); 079 } 080 081 public int getDescriptorIndex() { 082 return descriptorIndex; 083 } 084 085 public void setDescriptorIndex(final int descriptor_index) { 086 this.descriptorIndex = descriptor_index; 087 } 088 089 /** 090 * @return String representation 091 */ 092 @Override 093 public String toString() { 094 return super.toString() + "(descriptorIndex = " + descriptorIndex + ")"; 095 } 096}