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 * @version $Id: FCONST.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public class FCONST extends Instruction implements ConstantPushInstruction {
028
029    private float value;
030
031
032    /**
033     * Empty constructor needed for the Class.newInstance() statement in
034     * Instruction.readInstruction(). 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}