ELOptionTag


1   /*
2    * $Id: ELOptionTag.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.html;
20  
21  import org.apache.struts.taglib.html.OptionTag;
22  import javax.servlet.jsp.JspException  ;
23  import org.apache.strutsel.taglib.utils.EvalHelper;
24  
25  /**
26   * Tag for select options.  The body of this tag is presented to the user
27   * in the option list, while the value attribute is the value returned to
28   * the server if this option is selected.
29   *<p>
30   * This class is a subclass of the class
31   * <code>org.apache.struts.taglib.html.OptionTag</code> which provides most of
32   * the described functionality.  This subclass allows all attribute values to
33   * be specified as expressions utilizing the JavaServer Pages Standard Library
34   * expression language.
35   *
36   * @version $Rev: 54933 $
37   */
38  public class ELOptionTag extends OptionTag {
39  
40      /**
41       * Instance variable mapped to "bundle" tag attribute.
42       * (Mapping set in associated BeanInfo class.)
43       */
44      private String   bundleExpr;
45      /**
46       * Instance variable mapped to "disabled" tag attribute.
47       * (Mapping set in associated BeanInfo class.)
48       */
49      private String   disabledExpr;
50      /**
51       * Instance variable mapped to "key" tag attribute.
52       * (Mapping set in associated BeanInfo class.)
53       */
54      private String   keyExpr;
55      /**
56       * Instance variable mapped to "locale" tag attribute.
57       * (Mapping set in associated BeanInfo class.)
58       */
59      private String   localeExpr;
60      /**
61       * Instance variable mapped to "style" tag attribute.
62       * (Mapping set in associated BeanInfo class.)
63       */
64      private String   styleExpr;
65      /**
66       * Instance variable mapped to "styleClass" tag attribute.
67       * (Mapping set in associated BeanInfo class.)
68       */
69      private String   styleClassExpr;
70      /**
71       * Instance variable mapped to "styleId" tag attribute.
72       * (Mapping set in associated BeanInfo class.)
73       */
74      private String   styleIdExpr;
75      /**
76       * Instance variable mapped to "value" tag attribute.
77       * (Mapping set in associated BeanInfo class.)
78       */
79      private String   valueExpr;
80  
81      /**
82       * Getter method for "bundle" tag attribute.
83       * (Mapping set in associated BeanInfo class.)
84       */
85      public String   getBundleExpr() { return (bundleExpr); }
86      /**
87       * Getter method for "disabled" tag attribute.
88       * (Mapping set in associated BeanInfo class.)
89       */
90      public String   getDisabledExpr() { return (disabledExpr); }
91      /**
92       * Getter method for "key" tag attribute.
93       * (Mapping set in associated BeanInfo class.)
94       */
95      public String   getKeyExpr() { return (keyExpr); }
96      /**
97       * Getter method for "locale" tag attribute.
98       * (Mapping set in associated BeanInfo class.)
99       */
100     public String   getLocaleExpr() { return (localeExpr); }
101     /**
102      * Getter method for "style" tag attribute.
103      * (Mapping set in associated BeanInfo class.)
104      */
105     public String   getStyleExpr() { return (styleExpr); }
106     /**
107      * Getter method for "styleClass" tag attribute.
108      * (Mapping set in associated BeanInfo class.)
109      */
110     public String   getStyleClassExpr() { return (styleClassExpr); }
111     /**
112      * Getter method for "styleId" tag attribute.
113      * (Mapping set in associated BeanInfo class.)
114      */
115     public String   getStyleIdExpr() { return (styleIdExpr); }
116     /**
117      * Getter method for "value" tag attribute.
118      * (Mapping set in associated BeanInfo class.)
119      */
120     public String   getValueExpr() { return (valueExpr); }
121 
122     /**
123      * Setter method for "bundle" tag attribute.
124      * (Mapping set in associated BeanInfo class.)
125      */
126     public void setBundleExpr(String   bundleExpr) { this.bundleExpr = bundleExpr; }
127     /**
128      * Setter method for "disabled" tag attribute.
129      * (Mapping set in associated BeanInfo class.)
130      */
131     public void setDisabledExpr(String   disabledExpr) { this.disabledExpr = disabledExpr; }
132     /**
133      * Setter method for "key" tag attribute.
134      * (Mapping set in associated BeanInfo class.)
135      */
136     public void setKeyExpr(String   keyExpr) { this.keyExpr = keyExpr; }
137     /**
138      * Setter method for "locale" tag attribute.
139      * (Mapping set in associated BeanInfo class.)
140      */
141     public void setLocaleExpr(String   localeExpr) { this.localeExpr = localeExpr; }
142     /**
143      * Setter method for "style" tag attribute.
144      * (Mapping set in associated BeanInfo class.)
145      */
146     public void setStyleExpr(String   styleExpr) { this.styleExpr = styleExpr; }
147     /**
148      * Setter method for "styleClass" tag attribute.
149      * (Mapping set in associated BeanInfo class.)
150      */
151     public void setStyleClassExpr(String   styleClassExpr) { this.styleClassExpr = styleClassExpr; }
152     /**
153      * Setter method for "styleId" tag attribute.
154      * (Mapping set in associated BeanInfo class.)
155      */
156     public void setStyleIdExpr(String   styleIdExpr) { this.styleIdExpr = styleIdExpr; }
157     /**
158      * Setter method for "value" tag attribute.
159      * (Mapping set in associated BeanInfo class.)
160      */
161     public void setValueExpr(String   valueExpr) { this.valueExpr = valueExpr; }
162 
163     /**
164      * Resets attribute values for tag reuse.
165      */
166     public void release()
167     {
168         super.release();
169         setBundleExpr(null);
170         setDisabledExpr(null);
171         setKeyExpr(null);
172         setLocaleExpr(null);
173         setStyleExpr(null);
174         setStyleClassExpr(null);
175         setStyleIdExpr(null);
176         setValueExpr(null);
177     }
178 
179     /**
180      * Process the start tag.
181      *
182      * @exception JspException if a JSP exception has occurred
183      */
184     public int doStartTag() throws JspException   {
185         evaluateExpressions();
186         return(super.doStartTag());
187     }
188 
189     /**
190      * Processes all attribute values which use the JSTL expression evaluation
191      * engine to determine their values.
192      *
193      * @exception JspException if a JSP exception has occurred
194      */
195     private void evaluateExpressions() throws JspException   {
196         String    string  = null;
197         Boolean   bool    = null;
198 
199         if ((string = EvalHelper.evalString("bundle", getBundleExpr(),
200                                             this, pageContext)) != null)
201             setBundle(string);
202 
203         if ((bool = EvalHelper.evalBoolean("disabled", getDisabledExpr(),
204                                            this, pageContext)) != null)
205             setDisabled(bool.booleanValue());
206 
207         if ((string = EvalHelper.evalString("key", getKeyExpr(),
208                                             this, pageContext)) != null)
209             setKey(string);
210 
211         if ((string = EvalHelper.evalString("locale", getLocaleExpr(),
212                                             this, pageContext)) != null)
213             setLocale(string);
214 
215         if ((string = EvalHelper.evalString("style", getStyleExpr(),
216                                             this, pageContext)) != null)
217             setStyle(string);
218 
219         if ((string = EvalHelper.evalString("styleClass", getStyleClassExpr(),
220                                             this, pageContext)) != null)
221             setStyleClass(string);
222 
223         if ((string = EvalHelper.evalString("styleId", getStyleIdExpr(),
224                                             this, pageContext)) != null)
225             setStyleId(string);
226 
227         if ((string = EvalHelper.evalString("value", getValueExpr(),
228                                             this, pageContext)) != null)
229             setValue(string);
230     }
231 }
232
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