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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  import org.apache.bcel.ExceptionConst;
21  
22  /**
23   * Super class for instructions dealing with array access such as IALOAD.
24   *
25   * @version $Id: ArrayInstruction.html 990178 2016-06-08 08:17:52Z britter $
26   */
27  public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
28          TypedInstruction {
29  
30      /**
31       * Empty constructor needed for the Class.newInstance() statement in
32       * Instruction.readInstruction(). Not to be used otherwise.
33       */
34      ArrayInstruction() {
35      }
36  
37  
38      /**
39       * @param opcode of instruction
40       */
41      protected ArrayInstruction(final short opcode) {
42          super(opcode, (short) 1);
43      }
44  
45  
46      @Override
47      public Class<?>[] getExceptions() {
48          return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
49      }
50  
51  
52      /** @return type associated with the instruction
53       */
54      @Override
55      public Type getType( final ConstantPoolGen cp ) {
56          final short _opcode = super.getOpcode();
57          switch (_opcode) {
58              case org.apache.bcel.Const.IALOAD:
59              case org.apache.bcel.Const.IASTORE:
60                  return Type.INT;
61              case org.apache.bcel.Const.CALOAD:
62              case org.apache.bcel.Const.CASTORE:
63                  return Type.CHAR;
64              case org.apache.bcel.Const.BALOAD:
65              case org.apache.bcel.Const.BASTORE:
66                  return Type.BYTE;
67              case org.apache.bcel.Const.SALOAD:
68              case org.apache.bcel.Const.SASTORE:
69                  return Type.SHORT;
70              case org.apache.bcel.Const.LALOAD:
71              case org.apache.bcel.Const.LASTORE:
72                  return Type.LONG;
73              case org.apache.bcel.Const.DALOAD:
74              case org.apache.bcel.Const.DASTORE:
75                  return Type.DOUBLE;
76              case org.apache.bcel.Const.FALOAD:
77              case org.apache.bcel.Const.FASTORE:
78                  return Type.FLOAT;
79              case org.apache.bcel.Const.AALOAD:
80              case org.apache.bcel.Const.AASTORE:
81                  return Type.OBJECT;
82              default:
83                  throw new ClassGenException("Oops: unknown case in switch" + _opcode);
84          }
85      }
86  }