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.generic;
  22 
  23 /**
  24  * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
  25  *
  26  * <PRE>Stack: ... -&gt; ..., </PRE>
  27  *
  28  * @version $Id: FCONST.java 1747278 2016-06-07 17:28:43Z britter $
  29  */
  30 public class FCONST extends Instruction implements ConstantPushInstruction {
  31 
  32     private float value;
  33 
  34 
  35     /**
  36      * Empty constructor needed for the Class.newInstance() statement in
  37      * Instruction.readInstruction(). Not to be used otherwise.
  38      */
  39     FCONST() {
  40     }
  41 
  42 
  43     public FCONST(final float f) {
  44         super(com.sun.org.apache.bcel.internal.Const.FCONST_0, (short) 1);
  45         if (f == 0.0) {
  46             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_0);
  47         } else if (f == 1.0) {
  48             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_1);
  49         } else if (f == 2.0) {
  50             super.setOpcode(com.sun.org.apache.bcel.internal.Const.FCONST_2);
  51         } else {
  52             throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
  53         }
  54         value = f;
  55     }
  56 
  57 
  58     @Override
  59     public Number getValue() {
  60         return new Float(value);
  61     }
  62 
  63 
  64     /** @return Type.FLOAT
  65      */
  66     @Override
  67     public Type getType( final ConstantPoolGen cp ) {
  68         return Type.FLOAT;
  69     }
  70 
  71 
  72     /**
  73      * Call corresponding visitor method(s). The order is:
  74      * Call visitor methods of implemented interfaces first, then
  75      * call methods according to the class hierarchy in descending order,
  76      * i.e., the most specific visitXXX() call comes last.
  77      *
  78      * @param v Visitor object
  79      */
  80     @Override
  81     public void accept( final Visitor v ) {
  82         v.visitPushInstruction(this);
  83         v.visitStackProducer(this);
  84         v.visitTypedInstruction(this);
  85         v.visitConstantPushInstruction(this);
  86         v.visitFCONST(this);
  87     }
  88 }