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 Double object. 029 * 030 * @see Constant 031 */ 032public final class ConstantDouble extends Constant implements ConstantObject { 033 034 private double bytes; 035 036 037 /** 038 * @param bytes Data 039 */ 040 public ConstantDouble(final double bytes) { 041 super(Const.CONSTANT_Double); 042 this.bytes = bytes; 043 } 044 045 046 /** 047 * Initialize from another object. 048 */ 049 public ConstantDouble(final ConstantDouble c) { 050 this(c.getBytes()); 051 } 052 053 054 /** 055 * Initialize instance from file data. 056 * 057 * @param file Input stream 058 * @throws IOException 059 */ 060 ConstantDouble(final DataInput file) throws IOException { 061 this(file.readDouble()); 062 } 063 064 065 /** 066 * Called by objects that are traversing the nodes of the tree implicitely 067 * defined by the contents of a Java class. I.e., the hierarchy of methods, 068 * fields, attributes, etc. spawns a tree of objects. 069 * 070 * @param v Visitor object 071 */ 072 @Override 073 public void accept( final Visitor v ) { 074 v.visitConstantDouble(this); 075 } 076 077 078 /** 079 * Dump constant double to file stream in binary format. 080 * 081 * @param file Output file stream 082 * @throws IOException 083 */ 084 @Override 085 public void dump( final DataOutputStream file ) throws IOException { 086 file.writeByte(super.getTag()); 087 file.writeDouble(bytes); 088 } 089 090 091 /** 092 * @return data, i.e., 8 bytes. 093 */ 094 public double getBytes() { 095 return bytes; 096 } 097 098 099 /** 100 * @param bytes the raw bytes that represent the double value 101 */ 102 public void setBytes( final double bytes ) { 103 this.bytes = bytes; 104 } 105 106 107 /** 108 * @return String representation. 109 */ 110 @Override 111 public String toString() { 112 return super.toString() + "(bytes = " + bytes + ")"; 113 } 114 115 116 /** @return Double object 117 */ 118 @Override 119 public Object getConstantValue( final ConstantPool cp ) { 120 return new Double(bytes); 121 } 122}