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    1   /*
    2    * Copyright 2000-2001,2004 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.commons.jexl.util;
    18
    19
    20  import java.lang.reflect.InvocationTargetException;
    21  import java.lang.reflect.Method;
    22
    23  import org.apache.commons.logging.Log;
    24
    25  /***
    26   * Abstract class that is used to execute an arbitrary
    27   * method that is in introspected. This is the superclass
    28   * for the GetExecutor and PropertyExecutor.
    29   *
    30   * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
    31   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
    32   * @version $Id: AbstractExecutor.java,v 1.3 2004/02/28 13:45:21 yoavs Exp $
    33   */
    34  public abstract class AbstractExecutor
    35  {
    36      protected Log rlog = null;
    37
    38      /***
    39       * Method to be executed.
    40       */
    41      protected Method method = null;
    42
    43      /***
    44       * Execute method against context.
    45       */
    46       public abstract Object execute(Object o)
    47           throws IllegalAccessException, InvocationTargetException;
    48
    49      /***
    50       * Tell whether the executor is alive by looking
    51       * at the value of the method.
    52       */
    53      public boolean isAlive()
    54      {
    55          return (method != null);
    56      }
    57
    58      public Method getMethod()
    59      {
    60          return method;
    61      }
    62  }