1 /*
2 * Scope: a generic MVC framework.
3 * Copyright (c) 2000-2002, The Scope team
4 * All rights reserved.
5 *
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * Neither the name "Scope" nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 *
36 * $Id: ModelManager.java,v 1.7 2002/09/06 16:11:47 ludovicc Exp $
37 */
38 package org.scopemvc.core;
39
40 import org.apache.commons.logging.Log;
41 import org.apache.commons.logging.LogFactory;
42 import org.scopemvc.util.ScopeConfig;
43
44 /***
45 * <P>
46 *
47 * ModelManagers provide decoupled operations on model objects including access
48 * to properties and invocation of actions. A manager instance for a specific
49 * model object is obtained by a static factory method in the manager subclass.
50 * </P> <P>
51 *
52 * Other managers can be plugged in as appropriate to provide different
53 * functionality required on model objects. The base Scope implementation
54 * provides {@link PropertyManager}, {@link ActionManager} and {@link
55 * EditorManager} implementations. </P>
56 *
57 * @author <A HREF="mailto:smeyfroi@users.sourceforge.net">Steve Meyfroidt</A>
58 * @created 05 August 2002
59 * @version $Revision: 1.7 $ $Date: 2002/09/06 16:11:47 $
60 */
61 public abstract class ModelManager {
62
63 private final static Log LOG = LogFactory.getLog(ModelManager.class);
64
65 private Class modelClass;
66
67 /***
68 * Create a manager by looking up the class from ScopeConfig by the manager
69 * name.
70 *
71 * @param inManagerName The name of the manager
72 * @param inModelClass The class of the models that can be managed by the
73 * new manager instance
74 * @return A new manager instance
75 */
76 protected static ModelManager make(String inManagerName, Class inModelClass) {
77 Class managerClass = ScopeConfig.getClass(inManagerName);
78 if (managerClass == null) {
79 LOG.fatal("No Class for: " + inManagerName);
80 }
81 try {
82 ModelManager result = (ModelManager) managerClass.newInstance();
83 result.modelClass = inModelClass;
84 return result;
85 } catch (Exception e) {
86 LOG.fatal("Can't create: " + managerClass, e);
87 return null;
88 }
89 }
90
91 /***
92 * Gets the class of the models managed by this manager.
93 *
94 * @return The modelClass value
95 */
96 public Class getModelClass() {
97 return modelClass;
98 }
99 }
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