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