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| org.apache.commons.jexl.util.AbstractExecutor | 
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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 |   * @since 1.0 | |
| 31 |   * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> | |
| 32 |   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 33 |   * @version $Id: AbstractExecutor.java 398171 2006-04-29 14:57:29Z dion $ | |
| 34 |   */ | |
| 35 | 54 | public abstract class AbstractExecutor { | 
| 36 |      /** The executor instance log. */ | |
| 37 | 27 | protected Log rlog = null; | 
| 38 | ||
| 39 |      /** | |
| 40 |       * Method to be executed. | |
| 41 |       */ | |
| 42 | 27 | protected Method method = null; | 
| 43 | ||
| 44 |      /** | |
| 45 |       * Execute method against context. | |
| 46 |       * | |
| 47 |       * @param o The owner. | |
| 48 |       * @return The return value. | |
| 49 |       * @throws IllegalAccessException Method is inaccessible. | |
| 50 |       * @throws InvocationTargetException Method body throws an exception. | |
| 51 |       */ | |
| 52 | public abstract Object execute(Object o) | |
| 53 | throws IllegalAccessException, InvocationTargetException; | |
| 54 | ||
| 55 |      /** | |
| 56 |       * Tell whether the executor is alive by looking | |
| 57 |       * at the value of the method. | |
| 58 |       * | |
| 59 |       * @return boolean Whether the executor is alive. | |
| 60 |       */ | |
| 61 | public boolean isAlive() { | |
| 62 | 46 | return (method != null); | 
| 63 | } | |
| 64 | ||
| 65 |      /** | |
| 66 |       * Get the method to be executed. | |
| 67 |       * | |
| 68 |       * @return Method The method to be executed. | |
| 69 |       */ | |
| 70 |      public Method getMethod() { | |
| 71 | 0 |          return method; | 
| 72 | } | |
| 73 | } | 
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