KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > vladium > emma > ant > NestedTask


1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
2  *
3  * This program and the accompanying materials are made available under
4  * the terms of the Common Public License v1.0 which accompanies this distribution,
5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
6  *
7  * $Id: NestedTask.java,v 1.1.1.1.2.1 2004/07/08 10:52:10 vlad_r Exp $
8  */
9 package com.vladium.emma.ant;
10
11 import com.vladium.util.IProperties;
12
13 // ----------------------------------------------------------------------------
14 /**
15  * @author Vlad Roubtsov, (C) 2003
16  */
17 public
18 abstract class NestedTask extends SuppressableTask
19 {
20     // public: ................................................................
21
22     // protected: .............................................................
23
24     
25     protected NestedTask (final SuppressableTask parent)
26     {
27         if (parent == null)
28             throw new IllegalArgumentException JavaDoc ("null input: parent");
29         
30         m_parent = parent;
31     }
32
33     /**
34      * Overrides {@link SuppressableTask#getTaskSettings()} to mix in parent
35      * task settings as the base settings.
36      */
37     protected final IProperties getTaskSettings ()
38     {
39         final IProperties parentSettings = m_parent != null
40             ? m_parent.getTaskSettings ()
41             : null;
42         
43         final IProperties taskOverrides = super.getTaskSettings ();
44         
45         // task settings are always more specific than parent settings, but attention
46 // needs to be paid to horizontal inheritance:
47
48         if (parentSettings == null)
49             return taskOverrides;
50         else
51         {
52             final IProperties settings = IProperties.Factory.combine (taskOverrides, parentSettings);
53         
54             return settings;
55         }
56     }
57
58     
59     protected final SuppressableTask m_parent;
60
61     // package: ...............................................................
62
63     // private: ...............................................................
64
65 } // end of class
66 // ----------------------------------------------------------------------------
Popular Tags