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Java > Open Source Codes > org > apache > struts > faces > renderer > MessageRenderer


1 /*
2  * Copyright 2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.apache.struts.faces.renderer;
18
19
20 import java.util.ArrayList JavaDoc;
21 import java.util.Iterator JavaDoc;
22
23 import javax.faces.component.UIComponent;
24 import javax.faces.component.UIParameter;
25 import javax.faces.component.ValueHolder;
26 import javax.faces.context.FacesContext;
27
28 import org.apache.commons.logging.Log;
29 import org.apache.commons.logging.LogFactory;
30 import org.apache.struts.Globals;
31 import org.apache.struts.util.MessageResources;
32 import org.apache.struts.util.ResponseUtils;
33
34
35 /**
36  * <p><code>Renderer</code> implementation for the <code>message</code> tag
37  * from the <em>Struts-Faces Integration Library</em>.</p>
38  *
39  * @version $Rev: 155883 $ $Date: 2005-03-02 06:03:13 +0000 (Wed, 02 Mar 2005) $
40  */
41
42 public class MessageRenderer extends WriteRenderer {
43
44
45     // -------------------------------------------------------- Static Variables
46
47
48     /**
49      * <p>The <code>Log</code> instance for this class.</p>
50      */
51     private static Log log = LogFactory.getLog(MessageRenderer.class);
52
53
54     // ---------------------------------------------------------- Public Methods
55
56
57     // ------------------------------------------------------- Protected Methods
58
59
60     /**
61      * <p>Return the message format String to be processed for this message.
62      * </p>
63      *
64      * @param context FacesContext for the response we are creating
65      * @param component Component to be rendered
66      *
67      * @exception IllegalArgumentException if no MessageResources bundle
68      * can be found
69      * @exception IllegalArgumentException if no message key can be found
70      */
71     protected String JavaDoc getText(FacesContext context, UIComponent component) {
72
73         // Look up the MessageResources bundle to be used
74 String JavaDoc bundle = (String JavaDoc) component.getAttributes().get("bundle");
75         if (bundle == null) {
76             bundle = Globals.MESSAGES_KEY;
77         }
78         MessageResources resources = (MessageResources)
79             context.getExternalContext().getApplicationMap().get(bundle);
80         if (resources == null) { // FIXME - i18n
81 throw new IllegalArgumentException JavaDoc("MessageResources bundle " +
82                                                bundle + " not found");
83         }
84
85         // Look up the message key to be used
86 Object JavaDoc value = component.getAttributes().get("key");
87         if (value == null) {
88             value = ((ValueHolder) component).getValue();
89         }
90         if (value == null) { // FIXME - i18n
91 throw new NullPointerException JavaDoc("Component '" +
92                                            component.getClientId(context) +
93                                            "' has no current value");
94         }
95         String JavaDoc key = value.toString();
96
97         // Build the substitution arguments list
98 ArrayList JavaDoc list = new ArrayList JavaDoc();
99         Iterator JavaDoc kids = component.getChildren().iterator();
100         while (kids.hasNext()) {
101             UIComponent kid = (UIComponent) kids.next();
102             if (!(kid instanceof UIParameter)) {
103                 continue;
104             }
105             list.add(((UIParameter) kid).getValue());
106         }
107         Object JavaDoc args[] = list.toArray(new Object JavaDoc[list.size()]);
108
109         // Look up the requested message
110 String JavaDoc text = resources.getMessage(context.getViewRoot().getLocale(),
111                                            key, args);
112         Boolean JavaDoc filter = (Boolean JavaDoc) component.getAttributes().get("filter");
113         if (filter == null) {
114             filter = Boolean.FALSE;
115         }
116         if (filter.booleanValue()) {
117             return (ResponseUtils.filter(text));
118         } else {
119             return (text);
120         }
121
122     }
123
124
125 }
126
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