    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 $Id$
    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}