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