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    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.generic;
    18
    19  /***
    20   * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
    21   *
    22   * <PRE>Stack: ... -&gt; ..., </PRE>
    23   *
    24   * @version $Id: FCONST.java 386056 2006-03-15 11:31:56Z tcurdt $
    25   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    26   */
    27  public class FCONST extends Instruction implements ConstantPushInstruction, TypedInstruction {
    28
    29      private float value;
    30
    31
    32      /***
    33       * Empty constructor needed for the Class.newInstance() statement in
    34       * Instruction.readInstruction(). Not to be used otherwise.
    35       */
    36      FCONST() {
    37      }
    38
    39
    40      public FCONST(float f) {
    41          super(org.apache.bcel.Constants.FCONST_0, (short) 1);
    42          if (f == 0.0) {
    43              opcode = org.apache.bcel.Constants.FCONST_0;
    44          } else if (f == 1.0) {
    45              opcode = org.apache.bcel.Constants.FCONST_1;
    46          } else if (f == 2.0) {
    47              opcode = org.apache.bcel.Constants.FCONST_2;
    48          } else {
    49              throw new ClassGenException("FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
    50          }
    51          value = f;
    52      }
    53
    54
    55      public Number getValue() {
    56          return new Float(value);
    57      }
    58
    59
    60      /*** @return Type.FLOAT
    61       */
    62      public Type getType( ConstantPoolGen cp ) {
    63          return Type.FLOAT;
    64      }
    65
    66
    67      /***
    68       * Call corresponding visitor method(s). The order is:
    69       * Call visitor methods of implemented interfaces first, then
    70       * call methods according to the class hierarchy in descending order,
    71       * i.e., the most specific visitXXX() call comes last.
    72       *
    73       * @param v Visitor object
    74       */
    75      public void accept( Visitor v ) {
    76          v.visitPushInstruction(this);
    77          v.visitStackProducer(this);
    78          v.visitTypedInstruction(this);
    79          v.visitConstantPushInstruction(this);
    80          v.visitFCONST(this);
    81      }
    82  }