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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   * Super class for instructions dealing with array access such as IALOAD.
22   *
23   * @version $Id: ArrayInstruction.html 898356 2014-02-18 05:44:40Z ggregory $
24   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
25   */
26  public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
27          TypedInstruction {
28  
29      private static final long serialVersionUID = 1355074014869910296L;
30  
31  
32      /**
33       * Empty constructor needed for the Class.newInstance() statement in
34       * Instruction.readInstruction(). Not to be used otherwise.
35       */
36      ArrayInstruction() {
37      }
38  
39  
40      /**
41       * @param opcode of instruction
42       */
43      protected ArrayInstruction(short opcode) {
44          super(opcode, (short) 1);
45      }
46  
47  
48      public Class<?>[] getExceptions() {
49          return org.apache.bcel.ExceptionConstants.EXCS_ARRAY_EXCEPTION;
50      }
51  
52  
53      /** @return type associated with the instruction
54       */
55      public Type getType( ConstantPoolGen cp ) {
56          switch (opcode) {
57              case org.apache.bcel.Constants.IALOAD:
58              case org.apache.bcel.Constants.IASTORE:
59                  return Type.INT;
60              case org.apache.bcel.Constants.CALOAD:
61              case org.apache.bcel.Constants.CASTORE:
62                  return Type.CHAR;
63              case org.apache.bcel.Constants.BALOAD:
64              case org.apache.bcel.Constants.BASTORE:
65                  return Type.BYTE;
66              case org.apache.bcel.Constants.SALOAD:
67              case org.apache.bcel.Constants.SASTORE:
68                  return Type.SHORT;
69              case org.apache.bcel.Constants.LALOAD:
70              case org.apache.bcel.Constants.LASTORE:
71                  return Type.LONG;
72              case org.apache.bcel.Constants.DALOAD:
73              case org.apache.bcel.Constants.DASTORE:
74                  return Type.DOUBLE;
75              case org.apache.bcel.Constants.FALOAD:
76              case org.apache.bcel.Constants.FASTORE:
77                  return Type.FLOAT;
78              case org.apache.bcel.Constants.AALOAD:
79              case org.apache.bcel.Constants.AASTORE:
80                  return Type.OBJECT;
81              default:
82                  throw new ClassGenException("Oops: unknown case in switch" + opcode);
83          }
84      }
85  }