1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18 package org.apache.tools.ant.dispatch;
19
20 import org.apache.tools.ant.BuildException;
21 import org.apache.tools.ant.UnknownElement;
22 import org.apache.tools.ant.Task;
23
24 import java.lang.reflect.InvocationTargetException;
25 import java.lang.reflect.Method;
26
27 /**
28 * Determines and Executes the action method for the task.
29 */
30 // CheckStyle:HideUtilityClassConstructorCheck OFF - (bc)
31 public class DispatchUtils {
32 /**
33 * Determines and Executes the action method for the task.
34 * @param task the task to execute.
35 * @throws BuildException on error.
36 */
37 public static final void execute(Object task) throws BuildException {
38 String methodName = "execute";
39 Dispatchable dispatchable = null;
40 try {
41 if (task instanceof Dispatchable) {
42 dispatchable = (Dispatchable) task;
43 } else if (task instanceof UnknownElement) {
44 UnknownElement ue = (UnknownElement) task;
45 Object realThing = ue.getRealThing();
46 if (realThing != null
47 && realThing instanceof Dispatchable
48 && realThing instanceof Task) {
49 dispatchable = (Dispatchable) realThing;
50 }
51 }
52 if (dispatchable != null) {
53 String mName = null;
54 try {
55 final String name = dispatchable.getActionParameterName();
56 if (name != null && name.trim().length() > 0) {
57 mName = "get" + name.trim().substring(0, 1).toUpperCase();
58 if (name.length() > 1) {
59 mName += name.substring(1);
60 }
61 final Class c = dispatchable.getClass();
62 final Method actionM = c.getMethod(mName, new Class[0]);
63 if (actionM != null) {
64 final Object o = actionM.invoke(dispatchable, (Object[]) null);
65 if (o != null) {
66 final String s = o.toString();
67 if (s != null && s.trim().length() > 0) {
68 methodName = s.trim();
69 Method executeM = null;
70 executeM = dispatchable.getClass().getMethod(
71 methodName, new Class[0]);
72 if (executeM == null) {
73 throw new BuildException(
74 "No public " + methodName + "() in "
75 + dispatchable.getClass());
76 }
77 executeM.invoke(dispatchable, (Object[]) null);
78 if (task instanceof UnknownElement) {
79 ((UnknownElement) task).setRealThing(null);
80 }
81 } else {
82 throw new BuildException(
83 "Dispatchable Task attribute '" + name.trim()
84 + "' not set or value is empty.");
85 }
86 } else {
87 throw new BuildException(
88 "Dispatchable Task attribute '" + name.trim()
89 + "' not set or value is empty.");
90 }
91 }
92 } else {
93 throw new BuildException(
94 "Action Parameter Name must not be empty for Dispatchable Task.");
95 }
96 } catch (NoSuchMethodException nsme) {
97 throw new BuildException("No public " + mName + "() in " + task.getClass());
98 }
99 } else {
100 Method executeM = null;
101 executeM = task.getClass().getMethod(methodName, new Class[0]);
102 if (executeM == null) {
103 throw new BuildException("No public " + methodName + "() in "
104 + task.getClass());
105 }
106 executeM.invoke(task, (Object[]) null);
107 if (task instanceof UnknownElement) {
108 ((UnknownElement) task).setRealThing(null);
109 }
110 }
111 } catch (InvocationTargetException ie) {
112 Throwable t = ie.getTargetException();
113 if (t instanceof BuildException) {
114 throw ((BuildException) t);
115 } else {
116 throw new BuildException(t);
117 }
118 } catch (NoSuchMethodException e) {
119 throw new BuildException(e);
120 } catch (IllegalAccessException e) {
121 throw new BuildException(e);
122 }
123 }
124 }
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