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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   https://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.bcel.generic;
20  
21  import org.apache.bcel.ExceptionConst;
22  
23  /**
24   * Super class for instructions dealing with array access such as IALOAD.
25   */
26  public abstract class ArrayInstruction extends Instruction implements ExceptionThrower, TypedInstruction {
27  
28      /**
29       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
30       */
31      ArrayInstruction() {
32      }
33  
34      /**
35       * @param opcode of instruction
36       */
37      protected ArrayInstruction(final short opcode) {
38          super(opcode, (short) 1);
39      }
40  
41      @Override
42      public Class<?>[] getExceptions() {
43          return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
44      }
45  
46      /**
47       * @return type associated with the instruction
48       */
49      @Override
50      public Type getType(final ConstantPoolGen cp) {
51          final short opcode = super.getOpcode();
52          switch (opcode) {
53          case org.apache.bcel.Const.IALOAD:
54          case org.apache.bcel.Const.IASTORE:
55              return Type.INT;
56          case org.apache.bcel.Const.CALOAD:
57          case org.apache.bcel.Const.CASTORE:
58              return Type.CHAR;
59          case org.apache.bcel.Const.BALOAD:
60          case org.apache.bcel.Const.BASTORE:
61              return Type.BYTE;
62          case org.apache.bcel.Const.SALOAD:
63          case org.apache.bcel.Const.SASTORE:
64              return Type.SHORT;
65          case org.apache.bcel.Const.LALOAD:
66          case org.apache.bcel.Const.LASTORE:
67              return Type.LONG;
68          case org.apache.bcel.Const.DALOAD:
69          case org.apache.bcel.Const.DASTORE:
70              return Type.DOUBLE;
71          case org.apache.bcel.Const.FALOAD:
72          case org.apache.bcel.Const.FASTORE:
73              return Type.FLOAT;
74          case org.apache.bcel.Const.AALOAD:
75          case org.apache.bcel.Const.AASTORE:
76              return Type.OBJECT;
77          default:
78              throw new ClassGenException("Unknown case in switch" + opcode);
79          }
80      }
81  }