1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.lang.reflect.InvocationTargetException;
23 import java.lang.reflect.Method;
24
25 import org.apache.velocity.runtime.log.Log;
26
27 /**
28 * Abstract class that is used to execute an arbitrary
29 * method that is in introspected. This is the superclass
30 * for the GetExecutor and PropertyExecutor.
31 *
32 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
33 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
34 * @version $Id: AbstractExecutor.java 685685 2008-08-13 21:43:27Z nbubna $
35 */
36 public abstract class AbstractExecutor
37 {
38 /** */
39 protected Log log = null;
40
41 /**
42 * Method to be executed.
43 */
44 private Method method = null;
45
46 /**
47 * Execute method against context.
48 * @param o
49 * @return The resulting object.
50 * @throws IllegalAccessException
51 * @throws InvocationTargetException
52 */
53 public abstract Object execute(Object o)
54 throws IllegalAccessException, InvocationTargetException;
55
56 /**
57 * Tell whether the executor is alive by looking
58 * at the value of the method.
59 *
60 * @return True if executor is alive.
61 */
62 public boolean isAlive()
63 {
64 return (method != null);
65 }
66
67 /**
68 * @return The current method.
69 */
70 public Method getMethod()
71 {
72 return method;
73 }
74
75 /**
76 * @param method
77 * @since 1.5
78 */
79 protected void setMethod(final Method method)
80 {
81 this.method = method;
82 }
83 }