ELNotPresentTag


1   /*
2    * $Id: ELNotPresentTag.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.logic;
20  
21  import org.apache.struts.taglib.logic.NotPresentTag;
22  import javax.servlet.jsp.JspException  ;
23  import org.apache.strutsel.taglib.utils.EvalHelper;
24  
25  /**
26   * Evaluates the nested body content of this tag if the specified value is
27   * not present for this request.
28   *<p>
29   * This class is a subclass of the class
30   * <code>org.apache.struts.taglib.logic.NotPresentTag</code> which
31   * provides most of the described functionality.  This subclass allows all
32   * attribute values to be specified as expressions utilizing the JavaServer
33   * Pages Standard Library expression language.
34   *
35   * @version $Rev: 54933 $
36   */
37  public class ELNotPresentTag extends NotPresentTag {
38  
39      /**
40       * Instance variable mapped to "cookie" tag attribute.
41       * (Mapping set in associated BeanInfo class.)
42       */
43      private String   cookieExpr;
44      /**
45       * Instance variable mapped to "header" tag attribute.
46       * (Mapping set in associated BeanInfo class.)
47       */
48      private String   headerExpr;
49      /**
50       * Instance variable mapped to "name" tag attribute.
51       * (Mapping set in associated BeanInfo class.)
52       */
53      private String   nameExpr;
54      /**
55       * Instance variable mapped to "parameter" tag attribute.
56       * (Mapping set in associated BeanInfo class.)
57       */
58      private String   parameterExpr;
59      /**
60       * Instance variable mapped to "property" tag attribute.
61       * (Mapping set in associated BeanInfo class.)
62       */
63      private String   propertyExpr;
64      /**
65       * Instance variable mapped to "role" tag attribute.
66       * (Mapping set in associated BeanInfo class.)
67       */
68      private String   roleExpr;
69      /**
70       * Instance variable mapped to "scope" tag attribute.
71       * (Mapping set in associated BeanInfo class.)
72       */
73      private String   scopeExpr;
74      /**
75       * Instance variable mapped to "user" tag attribute.
76       * (Mapping set in associated BeanInfo class.)
77       */
78      private String   userExpr;
79  
80      /**
81       * Getter method for "cookie" tag attribute.
82       * (Mapping set in associated BeanInfo class.)
83       */
84      public String   getCookieExpr() { return (cookieExpr); }
85      /**
86       * Getter method for "header" tag attribute.
87       * (Mapping set in associated BeanInfo class.)
88       */
89      public String   getHeaderExpr() { return (headerExpr); }
90      /**
91       * Getter method for "name" tag attribute.
92       * (Mapping set in associated BeanInfo class.)
93       */
94      public String   getNameExpr() { return (nameExpr); }
95      /**
96       * Getter method for "parameter" tag attribute.
97       * (Mapping set in associated BeanInfo class.)
98       */
99      public String   getParameterExpr() { return (parameterExpr); }
100     /**
101      * Getter method for "property" tag attribute.
102      * (Mapping set in associated BeanInfo class.)
103      */
104     public String   getPropertyExpr() { return (propertyExpr); }
105     /**
106      * Getter method for "role" tag attribute.
107      * (Mapping set in associated BeanInfo class.)
108      */
109     public String   getRoleExpr() { return (roleExpr); }
110     /**
111      * Getter method for "scope" tag attribute.
112      * (Mapping set in associated BeanInfo class.)
113      */
114     public String   getScopeExpr() { return (scopeExpr); }
115     /**
116      * Getter method for "user" tag attribute.
117      * (Mapping set in associated BeanInfo class.)
118      */
119     public String   getUserExpr() { return (userExpr); }
120 
121     /**
122      * Setter method for "cookie" tag attribute.
123      * (Mapping set in associated BeanInfo class.)
124      */
125     public void setCookieExpr(String   cookieExpr) { this.cookieExpr = cookieExpr; }
126     /**
127      * Setter method for "header" tag attribute.
128      * (Mapping set in associated BeanInfo class.)
129      */
130     public void setHeaderExpr(String   headerExpr) { this.headerExpr = headerExpr; }
131     /**
132      * Setter method for "name" tag attribute.
133      * (Mapping set in associated BeanInfo class.)
134      */
135     public void setNameExpr(String   nameExpr) { this.nameExpr = nameExpr; }
136     /**
137      * Setter method for "parameter" tag attribute.
138      * (Mapping set in associated BeanInfo class.)
139      */
140     public void setParameterExpr(String   parameterExpr) { this.parameterExpr = parameterExpr; }
141     /**
142      * Setter method for "property" tag attribute.
143      * (Mapping set in associated BeanInfo class.)
144      */
145     public void setPropertyExpr(String   propertyExpr) { this.propertyExpr = propertyExpr; }
146     /**
147      * Setter method for "role" tag attribute.
148      * (Mapping set in associated BeanInfo class.)
149      */
150     public void setRoleExpr(String   roleExpr) { this.roleExpr = roleExpr; }
151     /**
152      * Setter method for "scope" tag attribute.
153      * (Mapping set in associated BeanInfo class.)
154      */
155     public void setScopeExpr(String   scopeExpr) { this.scopeExpr = scopeExpr; }
156     /**
157      * Setter method for "user" tag attribute.
158      * (Mapping set in associated BeanInfo class.)
159      */
160     public void setUserExpr(String   userExpr) { this.userExpr = userExpr; }
161 
162     /**
163      * Resets attribute values for tag reuse.
164      */
165     public void release()
166     {
167         super.release();
168         setCookieExpr(null);
169         setHeaderExpr(null);
170         setNameExpr(null);
171         setParameterExpr(null);
172         setPropertyExpr(null);
173         setRoleExpr(null);
174         setScopeExpr(null);
175         setUserExpr(null);
176     }
177     
178     /**
179      * Process the start tag.
180      *
181      * @exception JspException if a JSP exception has occurred
182      */
183     public int doStartTag() throws JspException   {
184         evaluateExpressions();
185         return (super.doStartTag());
186     }
187 
188     /**
189      * Processes all attribute values which use the JSTL expression evaluation
190      * engine to determine their values.
191      *
192      * @exception JspException if a JSP exception has occurred
193      */
194     private void evaluateExpressions() throws JspException   {
195         String    string  = null;
196 
197         if ((string = EvalHelper.evalString("cookie", getCookieExpr(),
198                                             this, pageContext)) != null)
199             setCookie(string);
200 
201         if ((string = EvalHelper.evalString("header", getHeaderExpr(),
202                                             this, pageContext)) != null)
203             setHeader(string);
204 
205         if ((string = EvalHelper.evalString("name", getNameExpr(),
206                                             this, pageContext)) != null)
207             setName(string);
208 
209         if ((string = EvalHelper.evalString("parameter", getParameterExpr(),
210                                             this, pageContext)) != null)
211             setParameter(string);
212 
213         if ((string = EvalHelper.evalString("property", getPropertyExpr(),
214                                             this, pageContext)) != null)
215             setProperty(string);
216 
217         if ((string = EvalHelper.evalString("role", getRoleExpr(),
218                                             this, pageContext)) != null)
219             setRole(string);
220 
221         if ((string = EvalHelper.evalString("scope", getScopeExpr(),
222                                             this, pageContext)) != null)
223             setScope(string);
224 
225         if ((string = EvalHelper.evalString("user", getUserExpr(),
226                                             this, pageContext)) != null)
227             setUser(string);
228     }
229 }
230
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags