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22 package org.apache.struts.faces.taglib;
23
24
25 import java.util.Locale;
26
27 import javax.faces.context.FacesContext;
28
29 import javax.servlet.jsp.PageContext;
30 import javax.servlet.jsp.tagext.TagSupport;
31
32 import org.apache.struts.Globals;
33 import org.apache.struts.faces.util.MessagesMap;
34 import org.apache.struts.util.MessageResources;
35
36
37 /**
38 * <p>Tag that exposes a specified <code>MessageResources</code> instance
39 * as <code>Map</code>, so that the embedded messages may be retrieved via
40 * value binding expressions.</p>
41 */
42
43 public class LoadMessagesTag extends TagSupport {
44
45
46
47
48
49 /**
50 * <p>The name of the <code>MessageResources</code> to expose, or
51 * <code>null</code> for the default <code>MessageResources</code>
52 * for this application module.</p>
53 */
54 private String messages = null;
55 public void setMessages(String messages) {
56 this.messages = messages;
57 }
58
59
60 /**
61 * <p>The request attribute key under which a <code>Map</code>
62 * will be exposed.</p>
63 */
64 private String var = null;
65 public void setVar(String var) {
66 this.var = var;
67 }
68
69
70
71
72
73 /**
74 * <p>Expose a <code>Map</code> wrapping the specified
75 * <code>MessageResources</code> instance, for the <code>Locale</code>
76 * specified in the view root component of the current view.</p>
77 */
78 public int doStartTag() {
79
80
81 Locale locale =
82 FacesContext.getCurrentInstance().getViewRoot().getLocale();
83
84
85 MessageResources messages = null;
86 if (this.messages == null) {
87 messages = (MessageResources)
88 pageContext.getAttribute(Globals.MESSAGES_KEY,
89 PageContext.REQUEST_SCOPE);
90 if (messages == null) {
91 messages = (MessageResources)
92 pageContext.getAttribute(Globals.MESSAGES_KEY,
93 PageContext.APPLICATION_SCOPE);
94 }
95 } else {
96 messages = (MessageResources)
97 pageContext.getAttribute(this.messages,
98 PageContext.APPLICATION_SCOPE);
99 }
100
101
102 pageContext.setAttribute(var,
103 new MessagesMap(messages, locale),
104 PageContext.REQUEST_SCOPE);
105
106
107 return (SKIP_BODY);
108
109 }
110
111
112 /**
113 * <p>Release any resources allocated by this tag instance.</p>
114 */
115 public void release() {
116
117 this.messages = null;
118 this.var = null;
119
120 }
121
122
123 }