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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   * @version $Id: LCONST.html 1021978 2017-12-09 17:38:21Z ggregory $
26   */
27  public class LCONST extends Instruction implements ConstantPushInstruction {
28  
29      private long value;
30  
31  
32      /**
33       * Empty constructor needed for Instruction.readInstruction.
34       * Not to be used otherwise.
35       */
36      LCONST() {
37      }
38  
39  
40      public LCONST(final long l) {
41          super(org.apache.bcel.Const.LCONST_0, (short) 1);
42          if (l == 0) {
43              super.setOpcode(org.apache.bcel.Const.LCONST_0);
44          } else if (l == 1) {
45              super.setOpcode(org.apache.bcel.Const.LCONST_1);
46          } else {
47              throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
48          }
49          value = l;
50      }
51  
52  
53      @Override
54      public Number getValue() {
55          return Long.valueOf(value);
56      }
57  
58  
59      /** @return Type.LONG
60       */
61      @Override
62      public Type getType( final ConstantPoolGen cp ) {
63          return Type.LONG;
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      @Override
76      public void accept( final Visitor v ) {
77          v.visitPushInstruction(this);
78          v.visitStackProducer(this);
79          v.visitTypedInstruction(this);
80          v.visitConstantPushInstruction(this);
81          v.visitLCONST(this);
82      }
83  }