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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   * Super class for stack operations like DUP and POP.
21   *
22   * @version $Id: StackInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
23   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
24   */
25  public abstract class StackInstruction extends Instruction {
26  
27      /***
28       * Empty constructor needed for the Class.newInstance() statement in
29       * Instruction.readInstruction(). Not to be used otherwise.
30       */
31      StackInstruction() {
32      }
33  
34  
35      /***
36       * @param opcode instruction opcode
37       */
38      protected StackInstruction(short opcode) {
39          super(opcode, (short) 1);
40      }
41  
42  
43      /*** @return Type.UNKNOWN
44       */
45      public Type getType( ConstantPoolGen cp ) {
46          return Type.UNKNOWN;
47      }
48  }