    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.bcel.generic;
    020
    021/**
    022 * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
    023 *
    024 * <PRE>
    025 * Stack: ... -&gt; ...,
    026 * </PRE>
    027 */
    028public class FCONST extends Instruction implements ConstantPushInstruction {
    029
    030    private final float value;
    031
    032    /**
    033     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    034     */
    035    FCONST() {
    036        this(0);
    037    }
    038
    039    /**
    040     * Constructs an FCONST instruction.
    041     *
    042     * @param f the float value.
    043     */
    044    public FCONST(final float f) {
    045        super(org.apache.bcel.Const.FCONST_0, (short) 1);
    046        if (f == 0.0) {
    047            super.setOpcode(org.apache.bcel.Const.FCONST_0);
    048        } else if (f == 1.0) {
    049            super.setOpcode(org.apache.bcel.Const.FCONST_1);
    050        } else if (f == 2.0) {
    051            super.setOpcode(org.apache.bcel.Const.FCONST_2);
    052        } else {
    053            throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
    054        }
    055        value = f;
    056    }
    057
    058    /**
    059     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    060     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
    061     *
    062     * @param v Visitor object.
    063     */
    064    @Override
    065    public void accept(final Visitor v) {
    066        v.visitPushInstruction(this);
    067        v.visitStackProducer(this);
    068        v.visitTypedInstruction(this);
    069        v.visitConstantPushInstruction(this);
    070        v.visitFCONST(this);
    071    }
    072
    073    /**
    074     * @return Type.FLOAT.
    075     */
    076    @Override
    077    public Type getType(final ConstantPoolGen cp) {
    078        return Type.FLOAT;
    079    }
    080
    081    @Override
    082    public Number getValue() {
    083        return Float.valueOf(value);
    084    }
    085}