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