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} 028 * and represents a reference to a method type. 029 * 030 * @see Constant 031 * @since 6.0 032 */ 033public final class ConstantMethodType extends Constant { 034 035 private int descriptor_index; 036 037 038 /** 039 * Initialize from another object. 040 */ 041 public ConstantMethodType(final ConstantMethodType c) { 042 this(c.getDescriptorIndex()); 043 } 044 045 046 /** 047 * Initialize instance from file data. 048 * 049 * @param file Input stream 050 * @throws IOException 051 */ 052 ConstantMethodType(final DataInput file) throws IOException { 053 this(file.readUnsignedShort()); 054 } 055 056 057 public ConstantMethodType(final int descriptor_index) { 058 super(Const.CONSTANT_MethodType); 059 this.descriptor_index = descriptor_index; 060 } 061 062 063 /** 064 * Called by objects that are traversing the nodes of the tree implicitly 065 * defined by the contents of a Java class. I.e., the hierarchy of methods, 066 * fields, attributes, etc. spawns a tree of objects. 067 * 068 * @param v Visitor object 069 */ 070 @Override 071 public void accept( final Visitor v ) { 072 v.visitConstantMethodType(this); 073 } 074 075 076 /** 077 * Dump name and signature index to file stream in binary format. 078 * 079 * @param file Output file stream 080 * @throws IOException 081 */ 082 @Override 083 public void dump( final DataOutputStream file ) throws IOException { 084 file.writeByte(super.getTag()); 085 file.writeShort(descriptor_index); 086 } 087 088 089 public int getDescriptorIndex() { 090 return descriptor_index; 091 } 092 093 094 public void setDescriptorIndex(final int descriptor_index) { 095 this.descriptor_index = descriptor_index; 096 } 097 098 099 /** 100 * @return String representation 101 */ 102 @Override 103 public String toString() { 104 return super.toString() + "(descriptor_index = " + descriptor_index + ")"; 105 } 106}