View Javadoc

    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.generic;
    18
    19  /***
    20   * Super class for instructions dealing with array access such as IALOAD.
    21   *
    22   * @version $Id: ArrayInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
    23   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    24   */
    25  public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
    26          TypedInstruction {
    27
    28      /***
    29       * Empty constructor needed for the Class.newInstance() statement in
    30       * Instruction.readInstruction(). Not to be used otherwise.
    31       */
    32      ArrayInstruction() {
    33      }
    34
    35
    36      /***
    37       * @param opcode of instruction
    38       */
    39      protected ArrayInstruction(short opcode) {
    40          super(opcode, (short) 1);
    41      }
    42
    43
    44      public Class[] getExceptions() {
    45          return org.apache.bcel.ExceptionConstants.EXCS_ARRAY_EXCEPTION;
    46      }
    47
    48
    49      /*** @return type associated with the instruction
    50       */
    51      public Type getType( ConstantPoolGen cp ) {
    52          switch (opcode) {
    53              case org.apache.bcel.Constants.IALOAD:
    54              case org.apache.bcel.Constants.IASTORE:
    55                  return Type.INT;
    56              case org.apache.bcel.Constants.CALOAD:
    57              case org.apache.bcel.Constants.CASTORE:
    58                  return Type.CHAR;
    59              case org.apache.bcel.Constants.BALOAD:
    60              case org.apache.bcel.Constants.BASTORE:
    61                  return Type.BYTE;
    62              case org.apache.bcel.Constants.SALOAD:
    63              case org.apache.bcel.Constants.SASTORE:
    64                  return Type.SHORT;
    65              case org.apache.bcel.Constants.LALOAD:
    66              case org.apache.bcel.Constants.LASTORE:
    67                  return Type.LONG;
    68              case org.apache.bcel.Constants.DALOAD:
    69              case org.apache.bcel.Constants.DASTORE:
    70                  return Type.DOUBLE;
    71              case org.apache.bcel.Constants.FALOAD:
    72              case org.apache.bcel.Constants.FASTORE:
    73                  return Type.FLOAT;
    74              case org.apache.bcel.Constants.AALOAD:
    75              case org.apache.bcel.Constants.AASTORE:
    76                  return Type.OBJECT;
    77              default:
    78                  throw new ClassGenException("Oops: unknown case in switch" + opcode);
    79          }
    80      }
    81  }