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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 instructions dealing with array access such as IALOAD.
21   *
22   * @version $Id: ArrayInstruction.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 ArrayInstruction extends Instruction implements ExceptionThrower,
26          TypedInstruction {
27  
28      /***
29       * Empty constructor needed for the Class.newInstance() statement in
30       * Instruction.readInstruction(). Not to be used otherwise.
31       */
32      ArrayInstruction() {
33      }
34  
35  
36      /***
37       * @param opcode of instruction
38       */
39      protected ArrayInstruction(short opcode) {
40          super(opcode, (short) 1);
41      }
42  
43  
44      public Class[] getExceptions() {
45          return org.apache.bcel.ExceptionConstants.EXCS_ARRAY_EXCEPTION;
46      }
47  
48  
49      /*** @return type associated with the instruction
50       */
51      public Type getType( ConstantPoolGen cp ) {
52          switch (opcode) {
53              case org.apache.bcel.Constants.IALOAD:
54              case org.apache.bcel.Constants.IASTORE:
55                  return Type.INT;
56              case org.apache.bcel.Constants.CALOAD:
57              case org.apache.bcel.Constants.CASTORE:
58                  return Type.CHAR;
59              case org.apache.bcel.Constants.BALOAD:
60              case org.apache.bcel.Constants.BASTORE:
61                  return Type.BYTE;
62              case org.apache.bcel.Constants.SALOAD:
63              case org.apache.bcel.Constants.SASTORE:
64                  return Type.SHORT;
65              case org.apache.bcel.Constants.LALOAD:
66              case org.apache.bcel.Constants.LASTORE:
67                  return Type.LONG;
68              case org.apache.bcel.Constants.DALOAD:
69              case org.apache.bcel.Constants.DASTORE:
70                  return Type.DOUBLE;
71              case org.apache.bcel.Constants.FALOAD:
72              case org.apache.bcel.Constants.FASTORE:
73                  return Type.FLOAT;
74              case org.apache.bcel.Constants.AALOAD:
75              case org.apache.bcel.Constants.AASTORE:
76                  return Type.OBJECT;
77              default:
78                  throw new ClassGenException("Oops: unknown case in switch" + opcode);
79          }
80      }
81  }