1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.bcel.internal.generic;
23
24
25/**
26 * DCONST - Push 0.0 or 1.0, other values cause an exception
27 *
28 * <PRE>Stack: ... -&gt; ..., </PRE>
29 *
30 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
31 */
32public class DCONST extends Instruction
33  implements ConstantPushInstruction, TypedInstruction {
34  private double value;
35
36  /**
37   * Empty constructor needed for the Class.newInstance() statement in
38   * Instruction.readInstruction(). Not to be used otherwise.
39   */
40  DCONST() {}
41
42  public DCONST(double f) {
43    super(com.sun.org.apache.bcel.internal.Constants.DCONST_0, (short)1);
44
45    if(f == 0.0)
46      opcode = com.sun.org.apache.bcel.internal.Constants.DCONST_0;
47    else if(f == 1.0)
48      opcode = com.sun.org.apache.bcel.internal.Constants.DCONST_1;
49    else
50      throw new ClassGenException("DCONST can be used only for 0.0 and 1.0: " + f);
51
52    value = f;
53  }
54
55  public Number getValue() { return new Double(value); }
56
57  /** @return Type.DOUBLE
58   */
59  public Type getType(ConstantPoolGen cp) {
60    return Type.DOUBLE;
61  }
62
63  /**
64   * Call corresponding visitor method(s). The order is:
65   * Call visitor methods of implemented interfaces first, then
66   * call methods according to the class hierarchy in descending order,
67   * i.e., the most specific visitXXX() call comes last.
68   *
69   * @param v Visitor object
70   */
71  public void accept(Visitor v) {
72    v.visitPushInstruction(this);
73    v.visitStackProducer(this);
74    v.visitTypedInstruction(this);
75    v.visitConstantPushInstruction(this);
76    v.visitDCONST(this);
77  }
78}
79