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: ... -> ..., </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 }