1 //----------------------------------------------------------------------
2 //
3 // PerfectJPattern: "Design patterns are good but components are better!"
4 // Example.java Copyright (c) 2009 Giovanni Azua Garcia
5 // bravegag@hotmail.com
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 3
10 // of the License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, see <http://www.gnu.org/licenses/>.
19 //
20 //----------------------------------------------------------------------
21 package org.perfectjpattern.core.behavioral.chainofresponsibility;
22
23 import java.util.*;
24
25 import org.perfectjpattern.core.api.behavioral.chainofresponsibility.*;
26
27 /**
28 * Startup Main for the Chain Of Responsibility Pattern Example code
29 *
30 * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
31 * @version $Revision: 1.0 $Date: Apr 5, 2008 10:11:17 PM $
32 */
33 // CHECKSTYLE:OFF
34 public final
35 class Example
36 // CHECKSTYLE:ON
37 {
38 //------------------------------------------------------------------------
39 // public
40 //------------------------------------------------------------------------
41 public static void
42 main(String[] anArguments)
43 {
44 //---------------------------------------------------------------
45 // Create all components of the Chain of Responsibility
46 //---------------------------------------------------------------
47 Button myOkButton = new Button("OK");
48 Button myPrintButton = new Button("Print");
49 Dialog mySaveDialog = new Dialog("Save");
50 Dialog myPrintDialog = new Dialog("Print");
51 Application myApplication = new Application();
52
53 //---------------------------------------------------------------
54 // Build "Show Help" Chain of Responsibility
55 //---------------------------------------------------------------
56 myOkButton.getHelpHandler().setSuccessor(myPrintDialog.
57 getHelpHandler());
58 myPrintButton.getHelpHandler().setSuccessor(myPrintDialog.
59 getHelpHandler());
60 myPrintDialog.getHelpHandler().setSuccessor(myApplication.
61 getHelpHandler());
62 mySaveDialog.getHelpHandler().setSuccessor(myApplication.
63 getHelpHandler());
64
65 //---------------------------------------------------------------
66 // Execute "Show Help" Chain of Responsibility from OK Button
67 //---------------------------------------------------------------
68 myOkButton.getHelpHandler().start();
69
70 //---------------------------------------------------------------
71 // Execute "Show Help" Chain of Responsibility from Save Dialog
72 //---------------------------------------------------------------
73 mySaveDialog.getHelpHandler().start();
74
75 //---------------------------------------------------------------
76 // Build "Print" Chain of Responsibility with a strategy
77 // AllHandleStrategy different than the default GoF Chain
78 // OnlyOneHandleStrategy
79 //---------------------------------------------------------------
80 myOkButton.getPrintHandler().setSuccessor(myPrintDialog.
81 getPrintHandler());
82 myPrintButton.getPrintHandler().setSuccessor(myPrintDialog.
83 getPrintHandler());
84 myPrintDialog.getPrintHandler().setSuccessor(myApplication.
85 getPrintHandler());
86 mySaveDialog.getPrintHandler().setSuccessor(myApplication.
87 getPrintHandler());
88
89 //---------------------------------------------------------------
90 // for this use-case we switch to the default Strategy
91 // AllHandleStrategy
92 //---------------------------------------------------------------
93 List<IHandler<NullRequest>> myHandlers = new ArrayList<IHandler<
94 NullRequest>>();
95 myHandlers.add(myOkButton.getPrintHandler());
96 myHandlers.add(myPrintButton.getPrintHandler());
97 myHandlers.add(myPrintDialog.getPrintHandler());
98 myHandlers.add(mySaveDialog.getPrintHandler());
99 myHandlers.add(myApplication.getPrintHandler());
100
101 for (IHandler<NullRequest> myHandler : myHandlers)
102 {
103 myHandler.setChainStrategy(AllHandleStrategy.getInstance());
104 }
105
106 //---------------------------------------------------------------
107 // Execute the "Print" Chain of Responsibility from OK Button
108 //---------------------------------------------------------------
109 myOkButton.getPrintHandler().start();
110
111 //---------------------------------------------------------------
112 // Execute the "Print" Chain of Responsibility from Save Dialog
113 //---------------------------------------------------------------
114 mySaveDialog.getPrintHandler().start();
115 }
116 }