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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  package org.apache.bcel.generic;
18  
19  import org.apache.bcel.ExceptionConst;
20  
21  /**
22   * Super class for instructions dealing with array access such as IALOAD.
23   */
24  public abstract class ArrayInstruction extends Instruction implements ExceptionThrower, TypedInstruction {
25  
26      /**
27       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
28       */
29      ArrayInstruction() {
30      }
31  
32      /**
33       * @param opcode of instruction
34       */
35      protected ArrayInstruction(final short opcode) {
36          super(opcode, (short) 1);
37      }
38  
39      @Override
40      public Class<?>[] getExceptions() {
41          return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
42      }
43  
44      /**
45       * @return type associated with the instruction
46       */
47      @Override
48      public Type getType(final ConstantPoolGen cp) {
49          final short opcode = super.getOpcode();
50          switch (opcode) {
51          case org.apache.bcel.Const.IALOAD:
52          case org.apache.bcel.Const.IASTORE:
53              return Type.INT;
54          case org.apache.bcel.Const.CALOAD:
55          case org.apache.bcel.Const.CASTORE:
56              return Type.CHAR;
57          case org.apache.bcel.Const.BALOAD:
58          case org.apache.bcel.Const.BASTORE:
59              return Type.BYTE;
60          case org.apache.bcel.Const.SALOAD:
61          case org.apache.bcel.Const.SASTORE:
62              return Type.SHORT;
63          case org.apache.bcel.Const.LALOAD:
64          case org.apache.bcel.Const.LASTORE:
65              return Type.LONG;
66          case org.apache.bcel.Const.DALOAD:
67          case org.apache.bcel.Const.DASTORE:
68              return Type.DOUBLE;
69          case org.apache.bcel.Const.FALOAD:
70          case org.apache.bcel.Const.FASTORE:
71              return Type.FLOAT;
72          case org.apache.bcel.Const.AALOAD:
73          case org.apache.bcel.Const.AASTORE:
74              return Type.OBJECT;
75          default:
76              throw new ClassGenException("Unknown case in switch" + opcode);
77          }
78      }
79  }