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.generic; 019 020/** 021 * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception 022 * 023 * <PRE>Stack: ... -> ..., </PRE> 024 * 025 * @version $Id: FCONST.java 1812166 2017-10-13 23:48:11Z ggregory $ 026 */ 027public class FCONST extends Instruction implements ConstantPushInstruction { 028 029 private float value; 030 031 032 /** 033 * Empty constructor needed for Instruction.readInstruction. 034 * Not to be used otherwise. 035 */ 036 FCONST() { 037 } 038 039 040 public FCONST(final float f) { 041 super(org.apache.bcel.Const.FCONST_0, (short) 1); 042 if (f == 0.0) { 043 super.setOpcode(org.apache.bcel.Const.FCONST_0); 044 } else if (f == 1.0) { 045 super.setOpcode(org.apache.bcel.Const.FCONST_1); 046 } else if (f == 2.0) { 047 super.setOpcode(org.apache.bcel.Const.FCONST_2); 048 } else { 049 throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f); 050 } 051 value = f; 052 } 053 054 055 @Override 056 public Number getValue() { 057 return new Float(value); 058 } 059 060 061 /** @return Type.FLOAT 062 */ 063 @Override 064 public Type getType( final ConstantPoolGen cp ) { 065 return Type.FLOAT; 066 } 067 068 069 /** 070 * Call corresponding visitor method(s). The order is: 071 * Call visitor methods of implemented interfaces first, then 072 * call methods according to the class hierarchy in descending order, 073 * i.e., the most specific visitXXX() call comes last. 074 * 075 * @param v Visitor object 076 */ 077 @Override 078 public void accept( final Visitor v ) { 079 v.visitPushInstruction(this); 080 v.visitStackProducer(this); 081 v.visitTypedInstruction(this); 082 v.visitConstantPushInstruction(this); 083 v.visitFCONST(this); 084 } 085}