ELMessageTag


1   /*
2    * $Id: ELMessageTag.java 54933 2004-10-16 17:04:52Z germuska $ 
3    *
4    * Copyright 1999-2004 The Apache Software Foundation.
5    * 
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    * 
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   * 
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.strutsel.taglib.bean;
20  
21  import javax.servlet.jsp.JspException  ;
22  
23  import org.apache.struts.taglib.bean.MessageTag;
24  import org.apache.strutsel.taglib.utils.EvalHelper;
25  
26  /**
27   * Custom tag that retrieves an internationalized messages string (with
28   * optional parametric replacement) from the <code>ActionResources</code>
29   * object stored as a context attribute by our associated
30   * <code>ActionServlet</code> implementation.
31   *<p>
32   * This class is a subclass of the class
33   * <code>org.apache.struts.taglib.bean.MessageTag</code> which provides most of
34   * the described functionality.  This subclass allows all attribute values to
35   * be specified as expressions utilizing the JavaServer Pages Standard Library
36   * expression language.
37   *
38   * @version $Rev: 54933 $
39   */
40  public class ELMessageTag extends MessageTag {
41  
42      /**
43       * Instance variable mapped to "arg0" tag attribute.
44       * (Mapping set in associated BeanInfo class.)
45       */
46      private String   arg0Expr;
47      /**
48       * Instance variable mapped to "arg1" tag attribute.
49       * (Mapping set in associated BeanInfo class.)
50       */
51      private String   arg1Expr;
52      /**
53       * Instance variable mapped to "arg2" tag attribute.
54       * (Mapping set in associated BeanInfo class.)
55       */
56      private String   arg2Expr;
57      /**
58       * Instance variable mapped to "arg3" tag attribute.
59       * (Mapping set in associated BeanInfo class.)
60       */
61      private String   arg3Expr;
62      /**
63       * Instance variable mapped to "arg4" tag attribute.
64       * (Mapping set in associated BeanInfo class.)
65       */
66      private String   arg4Expr;
67      /**
68       * Instance variable mapped to "bundle" tag attribute.
69       * (Mapping set in associated BeanInfo class.)
70       */
71      private String   bundleExpr;
72      /**
73       * Instance variable mapped to "key" tag attribute.
74       * (Mapping set in associated BeanInfo class.)
75       */
76      private String   keyExpr;
77      /**
78       * Instance variable mapped to "locale" tag attribute.
79       * (Mapping set in associated BeanInfo class.)
80       */
81      private String   localeExpr;
82      /**
83       * Instance variable mapped to "name" tag attribute.
84       * (Mapping set in associated BeanInfo class.)
85       */
86      private String   nameExpr;
87      /**
88       * Instance variable mapped to "property" tag attribute.
89       * (Mapping set in associated BeanInfo class.)
90       */
91      private String   propertyExpr;
92      /**
93       * Instance variable mapped to "scope" tag attribute.
94       * (Mapping set in associated BeanInfo class.)
95       */
96      private String   scopeExpr;
97  
98      /**
99       * Getter method for "arg0" tag attribute.
100      * (Mapping set in associated BeanInfo class.)
101      */
102     public String   getArg0Expr() { return (arg0Expr); }
103     /**
104      * Getter method for "arg1" tag attribute.
105      * (Mapping set in associated BeanInfo class.)
106      */
107     public String   getArg1Expr() { return (arg1Expr); }
108     /**
109      * Getter method for "arg2" tag attribute.
110      * (Mapping set in associated BeanInfo class.)
111      */
112     public String   getArg2Expr() { return (arg2Expr); }
113     /**
114      * Getter method for "arg3" tag attribute.
115      * (Mapping set in associated BeanInfo class.)
116      */
117     public String   getArg3Expr() { return (arg3Expr); }
118     /**
119      * Getter method for "arg4" tag attribute.
120      * (Mapping set in associated BeanInfo class.)
121      */
122     public String   getArg4Expr() { return (arg4Expr); }
123     /**
124      * Getter method for "bundle" tag attribute.
125      * (Mapping set in associated BeanInfo class.)
126      */
127     public String   getBundleExpr() { return (bundleExpr); }
128     /**
129      * Getter method for "key" tag attribute.
130      * (Mapping set in associated BeanInfo class.)
131      */
132     public String   getKeyExpr() { return (keyExpr); }
133     /**
134      * Getter method for "locale" tag attribute.
135      * (Mapping set in associated BeanInfo class.)
136      */
137     public String   getLocaleExpr() { return (localeExpr); }
138     /**
139      * Getter method for "name" tag attribute.
140      * (Mapping set in associated BeanInfo class.)
141      */
142     public String   getNameExpr() { return (nameExpr); }
143     /**
144      * Getter method for "property" tag attribute.
145      * (Mapping set in associated BeanInfo class.)
146      */
147     public String   getPropertyExpr() { return (propertyExpr); }
148     /**
149      * Getter method for "scope" tag attribute.
150      * (Mapping set in associated BeanInfo class.)
151      */
152     public String   getScopeExpr() { return (scopeExpr); }
153 
154     /**
155      * Setter method for "arg0" tag attribute.
156      * (Mapping set in associated BeanInfo class.)
157      */
158     public void setArg0Expr(String   arg0Expr) { this.arg0Expr = arg0Expr; }
159     /**
160      * Setter method for "arg1" tag attribute.
161      * (Mapping set in associated BeanInfo class.)
162      */
163     public void setArg1Expr(String   arg1Expr) { this.arg1Expr = arg1Expr; }
164     /**
165      * Setter method for "arg2" tag attribute.
166      * (Mapping set in associated BeanInfo class.)
167      */
168     public void setArg2Expr(String   arg2Expr) { this.arg2Expr = arg2Expr; }
169     /**
170      * Setter method for "arg3" tag attribute.
171      * (Mapping set in associated BeanInfo class.)
172      */
173     public void setArg3Expr(String   arg3Expr) { this.arg3Expr = arg3Expr; }
174     /**
175      * Setter method for "arg4" tag attribute.
176      * (Mapping set in associated BeanInfo class.)
177      */
178     public void setArg4Expr(String   arg4Expr) { this.arg4Expr = arg4Expr; }
179     /**
180      * Setter method for "bundle" tag attribute.
181      * (Mapping set in associated BeanInfo class.)
182      */
183     public void setBundleExpr(String   bundleExpr) { this.bundleExpr = bundleExpr; }
184     /**
185      * Setter method for "key" tag attribute.
186      * (Mapping set in associated BeanInfo class.)
187      */
188     public void setKeyExpr(String   keyExpr) { this.keyExpr = keyExpr; }
189     /**
190      * Setter method for "locale" tag attribute.
191      * (Mapping set in associated BeanInfo class.)
192      */
193     public void setLocaleExpr(String   localeExpr) { this.localeExpr = localeExpr; }
194     /**
195      * Setter method for "name" tag attribute.
196      * (Mapping set in associated BeanInfo class.)
197      */
198     public void setNameExpr(String   nameExpr) { this.nameExpr = nameExpr; }
199     /**
200      * Setter method for "property" tag attribute.
201      * (Mapping set in associated BeanInfo class.)
202      */
203     public void setPropertyExpr(String   propertyExpr) { this.propertyExpr = propertyExpr; }
204     /**
205      * Setter method for "scope" tag attribute.
206      * (Mapping set in associated BeanInfo class.)
207      */
208     public void setScopeExpr(String   scopeExpr) { this.scopeExpr = scopeExpr; }
209 
210     /**
211      * Resets attribute values for tag reuse.
212      */
213     public void release()
214     {
215         super.release();
216         setArg0Expr(null);
217         setArg1Expr(null);
218         setArg2Expr(null);
219         setArg3Expr(null);
220         setArg4Expr(null);
221         setBundleExpr(null);
222         setKeyExpr(null);
223         setLocaleExpr(null);
224         setNameExpr(null);
225         setPropertyExpr(null);
226         setScopeExpr(null);
227     }
228     
229     /**
230      * Process the start tag.
231      *
232      * @exception JspException if a JSP exception has occurred
233      */
234     public int doStartTag() throws JspException   {
235         evaluateExpressions();
236         return (super.doStartTag());
237     }
238 
239     /**
240      * Processes all attribute values which use the JSTL expression evaluation
241      * engine to determine their values.
242      *
243      * @exception JspException if a JSP exception has occurred
244      */
245     private void evaluateExpressions() throws JspException   {
246         String    string  = null;
247 
248 
249         if ((string = EvalHelper.evalString("arg0", getArg0Expr(),
250                                             this, pageContext)) != null)
251             setArg0(string);
252 
253         if ((string = EvalHelper.evalString("arg1", getArg1Expr(),
254                                             this, pageContext)) != null)
255             setArg1(string);
256 
257         if ((string = EvalHelper.evalString("arg2", getArg2Expr(),
258                                             this, pageContext)) != null)
259             setArg2(string);
260 
261         if ((string = EvalHelper.evalString("arg3", getArg3Expr(),
262                                             this, pageContext)) != null)
263             setArg3(string);
264 
265         if ((string = EvalHelper.evalString("arg4", getArg4Expr(),
266                                             this, pageContext)) != null)
267             setArg4(string);
268 
269         if ((string = EvalHelper.evalString("bundle", getBundleExpr(),
270                                             this, pageContext)) != null)
271             setBundle(string);
272 
273         if ((string = EvalHelper.evalString("key", getKeyExpr(),
274                                             this, pageContext)) != null)
275             setKey(string);
276 
277         if ((string = EvalHelper.evalString("locale", getLocaleExpr(),
278                                             this, pageContext)) != null)
279             setLocale(string);
280 
281         if ((string = EvalHelper.evalString("name", getNameExpr(),
282                                             this, pageContext)) != null)
283             setName(string);
284 
285         if ((string = EvalHelper.evalString("property", getPropertyExpr(),
286                                             this, pageContext)) != null)
287             setProperty(string);
288 
289         if ((string = EvalHelper.evalString("scope", getScopeExpr(),
290                                             this, pageContext)) != null)
291             setScope(string);
292     }
293 }
294
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