1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 
  21 package com.sun.org.apache.bcel.internal.classfile;
  22 
  23 import java.io.DataInput;
  24 import java.io.DataOutputStream;
  25 import java.io.IOException;
  26 
  27 import com.sun.org.apache.bcel.internal.Const;
  28 
  29 /**
  30  * This class is derived from the abstract  {@link Constant}
  31  * and represents a reference to a Double object.
  32  *
  33  * @version $Id: ConstantDouble.java 1747278 2016-06-07 17:28:43Z britter $
  34  * @see     Constant
  35  * @LastModified: Nov 2017
  36  */
  37 public final class ConstantDouble extends Constant implements ConstantObject {
  38 
  39     private double bytes;
  40 
  41 
  42     /**
  43      * @param bytes Data
  44      */
  45     public ConstantDouble(final double bytes) {
  46         super(Const.CONSTANT_Double);
  47         this.bytes = bytes;
  48     }
  49 
  50 
  51     /**
  52      * Initialize from another object.
  53      */
  54     public ConstantDouble(final ConstantDouble c) {
  55         this(c.getBytes());
  56     }
  57 
  58 
  59     /**
  60      * Initialize instance from file data.
  61      *
  62      * @param file Input stream
  63      * @throws IOException
  64      */
  65     ConstantDouble(final DataInput file) throws IOException {
  66         this(file.readDouble());
  67     }
  68 
  69 
  70     /**
  71      * Called by objects that are traversing the nodes of the tree implicitely
  72      * defined by the contents of a Java class. I.e., the hierarchy of methods,
  73      * fields, attributes, etc. spawns a tree of objects.
  74      *
  75      * @param v Visitor object
  76      */
  77     @Override
  78     public void accept( final Visitor v ) {
  79         v.visitConstantDouble(this);
  80     }
  81 
  82 
  83     /**
  84      * Dump constant double to file stream in binary format.
  85      *
  86      * @param file Output file stream
  87      * @throws IOException
  88      */
  89     @Override
  90     public final void dump( final DataOutputStream file ) throws IOException {
  91         file.writeByte(super.getTag());
  92         file.writeDouble(bytes);
  93     }
  94 
  95 
  96     /**
  97      * @return data, i.e., 8 bytes.
  98      */
  99     public final double getBytes() {
 100         return bytes;
 101     }
 102 
 103 
 104     /**
 105      * @param bytes the raw bytes that represent the double value
 106      */
 107     public final void setBytes( final double bytes ) {
 108         this.bytes = bytes;
 109     }
 110 
 111 
 112     /**
 113      * @return String representation.
 114      */
 115     @Override
 116     public final String toString() {
 117         return super.toString() + "(bytes = " + bytes + ")";
 118     }
 119 
 120 
 121     /** @return Double object
 122      */
 123     @Override
 124     public Object getConstantValue( final ConstantPool cp ) {
 125         return bytes;
 126     }
 127 }