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 float object. 029 * 030 * @see Constant 031 */ 032public final class ConstantFloat extends Constant implements ConstantObject { 033 034 private float bytes; 035 036 037 /** 038 * @param bytes Data 039 */ 040 public ConstantFloat(final float bytes) { 041 super(Const.CONSTANT_Float); 042 this.bytes = bytes; 043 } 044 045 046 /** 047 * Initialize from another object. Note that both objects use the same 048 * references (shallow copy). Use clone() for a physical copy. 049 */ 050 public ConstantFloat(final ConstantFloat c) { 051 this(c.getBytes()); 052 } 053 054 055 /** 056 * Initialize instance from file data. 057 * 058 * @param file Input stream 059 * @throws IOException 060 */ 061 ConstantFloat(final DataInput file) throws IOException { 062 this(file.readFloat()); 063 } 064 065 066 /** 067 * Called by objects that are traversing the nodes of the tree implicitely 068 * defined by the contents of a Java class. I.e., the hierarchy of methods, 069 * fields, attributes, etc. spawns a tree of objects. 070 * 071 * @param v Visitor object 072 */ 073 @Override 074 public void accept( final Visitor v ) { 075 v.visitConstantFloat(this); 076 } 077 078 079 /** 080 * Dump constant float to file stream in binary format. 081 * 082 * @param file Output file stream 083 * @throws IOException 084 */ 085 @Override 086 public void dump( final DataOutputStream file ) throws IOException { 087 file.writeByte(super.getTag()); 088 file.writeFloat(bytes); 089 } 090 091 092 /** 093 * @return data, i.e., 4 bytes. 094 */ 095 public float getBytes() { 096 return bytes; 097 } 098 099 100 /** 101 * @param bytes the raw bytes that represent this float 102 */ 103 public void setBytes( final float bytes ) { 104 this.bytes = bytes; 105 } 106 107 108 /** 109 * @return String representation. 110 */ 111 @Override 112 public String toString() { 113 return super.toString() + "(bytes = " + bytes + ")"; 114 } 115 116 117 /** @return Float object 118 */ 119 @Override 120 public Object getConstantValue( final ConstantPool cp ) { 121 return new Float(bytes); 122 } 123}