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: ... -&gt; ..., </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}