1 //----------------------------------------------------------------------
2 //
3 // PerfectJPattern: "Design patterns are good but components are better!"
4 // AbstractReceiver.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.command;
22
23 import org.apache.commons.lang.*;
24 import org.perfectjpattern.core.api.behavioral.command.*;
25
26
27 /**
28 * Reusable base abstract implementation of {@link IReceiver}
29 *
30 * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
31 * @version $Revision: 1.0 $Date: Apr 13, 2008 2:24:53 PM $
32 */
33 public abstract
34 class AbstractReceiver<P, R>
35 implements IReceiver<P, R>
36 {
37 //------------------------------------------------------------------------
38 // public
39 //------------------------------------------------------------------------
40 /**
41 * {@inheritDoc}
42 */
43 public R
44 getResult()
45 {
46 return theResult;
47 }
48
49 //------------------------------------------------------------------------
50 /**
51 * {@inheritDoc}
52 */
53 public void
54 setParameter(P aParameter)
55 throws IllegalArgumentException
56 {
57 Validate.notNull(aParameter, "'aParameter' must not be null");
58
59 theParameter = aParameter;
60 }
61
62 //------------------------------------------------------------------------
63 // protected
64 //------------------------------------------------------------------------
65 /**
66 * Returns the previously assigned Parameter
67 *
68 * @return the parameter
69 */
70 protected P
71 getParameter()
72 {
73 return theParameter;
74 }
75
76 //------------------------------------------------------------------------
77 /**
78 * Sets the Result
79 *
80 * @param aResult the result to set
81 */
82 protected void
83 setResult(R aResult)
84 {
85 assert aResult != null : "'aResult' must not be null";
86
87 theResult = aResult;
88 }
89
90 //------------------------------------------------------------------------
91 // members
92 //------------------------------------------------------------------------
93 private P theParameter;
94 private R theResult;
95 }