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Java > Open Source Codes > com > jcorporate > expresso > ext > struts > taglib > bean > ExMessageTag


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64
65 package com.jcorporate.expresso.ext.struts.taglib.bean;
66
67 import com.jcorporate.expresso.core.controller.ControllerResponse;
68 import com.jcorporate.expresso.ext.struts.taglib.ControllerUtils;
69 import com.jcorporate.expresso.ext.taglib.MessageUtil;
70 import org.apache.struts.taglib.bean.MessageTag;
71 import org.apache.struts.util.ResponseUtils;
72
73 import javax.servlet.jsp.JspException JavaDoc;
74 import javax.servlet.jsp.PageContext JavaDoc;
75
76
77 /**
78  * Expresso-specific extension to the MessageTag from Struts:
79  * this version gets it's message string from the ControllerRequest object,
80  * which knows the current user's locale settings already, and also has
81  * the application schema code, which allows us to use the appropriate message
82  * bundle file for the current application, as Expresso support multiple
83  * message bundles, one per schema
84  *
85  * @author Michael Nash
86  */
87 public class ExMessageTag
88         extends MessageTag {
89     public final static String JavaDoc SCHEMA_KEY = "ExMessageTag.SCHEMA";
90     public String JavaDoc schemaClass = null;
91
92     public void setSchema(String JavaDoc newSchema) {
93         schemaClass = newSchema;
94     }
95
96     public String JavaDoc getSchema() {
97         return schemaClass;
98     }
99     // --------------------------------------------------------- Public Methods
100 /**
101      * Process the start tag.
102      *
103      * @return integer as defined in the standard tag library framework.
104      * @throws JspException if a JSP exception has occurred
105      */
106     public int doStartTag()
107             throws JspException JavaDoc {
108
109         // Construct the optional arguments array we will be using
110 Object JavaDoc[] args = new Object JavaDoc[5];
111         args[0] = arg0;
112         args[1] = arg1;
113         args[2] = arg2;
114         args[3] = arg3;
115         args[4] = arg4;
116
117         String JavaDoc useSchema = null;
118         String JavaDoc message = null;
119
120         /* If we weren't given a schema class */
121         if (schemaClass == null) {
122             useSchema = (String JavaDoc) pageContext.getAttribute(SCHEMA_KEY,
123                     PageContext.PAGE_SCOPE);
124         } else {
125             useSchema = schemaClass;
126             pageContext.setAttribute(SCHEMA_KEY, useSchema,
127                     PageContext.PAGE_SCOPE);
128         }
129         /* If we didn't get a schema from the context */
130         if (useSchema == null) {
131             ControllerResponse myResponse = ControllerUtils.getResponse(pageContext);
132
133             if (myResponse != null) {
134                 pageContext.setAttribute(SCHEMA_KEY, myResponse.getSchema(),
135                         PageContext.PAGE_SCOPE);
136             }
137         }
138
139         message = MessageUtil.getString(pageContext, key, args);
140
141         if (message == null) {
142             message = key;
143         }
144
145         // Print the retrieved message to our output writer
146 ResponseUtils.write(pageContext, message);
147
148         // Continue processing this page
149 return (SKIP_BODY);
150     }
151 }
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