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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.bcel.generic;
19  
20  /**
21   * LCONST - Push 0 or 1, other values cause an exception
22   *
23   * <PRE>Stack: ... -&gt; ..., </PRE>
24   *
25   */
26  public class LCONST extends Instruction implements ConstantPushInstruction {
27  
28      private long value;
29  
30  
31      /**
32       * Empty constructor needed for Instruction.readInstruction.
33       * Not to be used otherwise.
34       */
35      LCONST() {
36      }
37  
38  
39      public LCONST(final long l) {
40          super(org.apache.bcel.Const.LCONST_0, (short) 1);
41          if (l == 0) {
42              super.setOpcode(org.apache.bcel.Const.LCONST_0);
43          } else if (l == 1) {
44              super.setOpcode(org.apache.bcel.Const.LCONST_1);
45          } else {
46              throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
47          }
48          value = l;
49      }
50  
51  
52      @Override
53      public Number getValue() {
54          return Long.valueOf(value);
55      }
56  
57  
58      /** @return Type.LONG
59       */
60      @Override
61      public Type getType( final ConstantPoolGen cp ) {
62          return Type.LONG;
63      }
64  
65  
66      /**
67       * Call corresponding visitor method(s). The order is:
68       * Call visitor methods of implemented interfaces first, then
69       * call methods according to the class hierarchy in descending order,
70       * i.e., the most specific visitXXX() call comes last.
71       *
72       * @param v Visitor object
73       */
74      @Override
75      public void accept( final Visitor v ) {
76          v.visitPushInstruction(this);
77          v.visitStackProducer(this);
78          v.visitTypedInstruction(this);
79          v.visitConstantPushInstruction(this);
80          v.visitLCONST(this);
81      }
82  }