ELAddTag


1   /*
2    * $Id: ELAddTag.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.tiles;
20  
21  import org.apache.struts.taglib.tiles.AddTag;
22  import javax.servlet.jsp.JspException  ;
23  import org.apache.strutsel.taglib.utils.EvalHelper;
24  
25  /**
26   * Adds an element to the surrounding list tag.  Same syntax as
27   * <code>&lt;put&gt;</code>.
28   *<p>
29   * This class is a subclass of the class
30   * <code>org.apache.struts.taglib.tiles.AddTag</code> which provides most of
31   * the described functionality.  This subclass allows all attribute values to
32   * be specified as expressions utilizing the JavaServer Pages Standard Library
33   * expression language.
34   *
35   * @version $Rev: 54933 $
36   */
37  public class ELAddTag extends AddTag {
38  
39      /**
40       * Instance variable mapped to "value" tag attribute.
41       * (Mapping set in associated BeanInfo class.)
42       */
43      private String   valueExpr;
44      /**
45       * Instance variable mapped to "content" tag attribute.
46       * (Mapping set in associated BeanInfo class.)
47       */
48      private String   contentExpr;
49      /**
50       * Instance variable mapped to "direct" tag attribute.
51       * (Mapping set in associated BeanInfo class.)
52       */
53      private String   directExpr;
54      /**
55       * Instance variable mapped to "type" tag attribute.
56       * (Mapping set in associated BeanInfo class.)
57       */
58      private String   typeExpr;
59      /**
60       * Instance variable mapped to "beanName" tag attribute.
61       * (Mapping set in associated BeanInfo class.)
62       */
63      private String   beanNameExpr;
64      /**
65       * Instance variable mapped to "beanProperty" tag attribute.
66       * (Mapping set in associated BeanInfo class.)
67       */
68      private String   beanPropertyExpr;
69      /**
70       * Instance variable mapped to "beanScope" tag attribute.
71       * (Mapping set in associated BeanInfo class.)
72       */
73      private String   beanScopeExpr;
74      /**
75       * Instance variable mapped to "role" tag attribute.
76       * (Mapping set in associated BeanInfo class.)
77       */
78      private String   roleExpr;
79  
80      /**
81       * Getter method for "value" tag attribute.
82       * (Mapping set in associated BeanInfo class.)
83       */
84      public String   getValueExpr() { return (valueExpr); }
85      /**
86       * Getter method for "content" tag attribute.
87       * (Mapping set in associated BeanInfo class.)
88       */
89      public String   getContentExpr() { return (contentExpr); }
90      /**
91       * Getter method for "direct" tag attribute.
92       * (Mapping set in associated BeanInfo class.)
93       */
94      public String   getDirectExpr() { return (directExpr); }
95      /**
96       * Getter method for "type" tag attribute.
97       * (Mapping set in associated BeanInfo class.)
98       */
99      public String   getTypeExpr() { return (typeExpr); }
100     /**
101      * Getter method for "beanName" tag attribute.
102      * (Mapping set in associated BeanInfo class.)
103      */
104     public String   getBeanNameExpr() { return (beanNameExpr); }
105     /**
106      * Getter method for "beanProperty" tag attribute.
107      * (Mapping set in associated BeanInfo class.)
108      */
109     public String   getBeanPropertyExpr() { return (beanPropertyExpr); }
110     /**
111      * Getter method for "beanScope" tag attribute.
112      * (Mapping set in associated BeanInfo class.)
113      */
114     public String   getBeanScopeExpr() { return (beanScopeExpr); }
115     /**
116      * Getter method for "role" tag attribute.
117      * (Mapping set in associated BeanInfo class.)
118      */
119     public String   getRoleExpr() { return (roleExpr); }
120 
121     /**
122      * Setter method for "value" tag attribute.
123      * (Mapping set in associated BeanInfo class.)
124      */
125     public void setValueExpr(String   valueExpr) { this.valueExpr = valueExpr; }
126     /**
127      * Setter method for "content" tag attribute.
128      * (Mapping set in associated BeanInfo class.)
129      */
130     public void setContentExpr(String   contentExpr) { this.contentExpr = contentExpr; }
131     /**
132      * Setter method for "direct" tag attribute.
133      * (Mapping set in associated BeanInfo class.)
134      */
135     public void setDirectExpr(String   directExpr) { this.directExpr = directExpr; }
136     /**
137      * Setter method for "type" tag attribute.
138      * (Mapping set in associated BeanInfo class.)
139      */
140     public void setTypeExpr(String   typeExpr) { this.typeExpr = typeExpr; }
141     /**
142      * Setter method for "beanName" tag attribute.
143      * (Mapping set in associated BeanInfo class.)
144      */
145     public void setBeanNameExpr(String   beanNameExpr) { this.beanNameExpr = beanNameExpr; }
146     /**
147      * Setter method for "beanProperty" tag attribute.
148      * (Mapping set in associated BeanInfo class.)
149      */
150     public void setBeanPropertyExpr(String   beanPropertyExpr) { this.beanPropertyExpr = beanPropertyExpr; }
151     /**
152      * Setter method for "beanScope" tag attribute.
153      * (Mapping set in associated BeanInfo class.)
154      */
155     public void setBeanScopeExpr(String   beanScopeExpr) { this.beanScopeExpr = beanScopeExpr; }
156     /**
157      * Setter method for "role" tag attribute.
158      * (Mapping set in associated BeanInfo class.)
159      */
160     public void setRoleExpr(String   roleExpr) { this.roleExpr = roleExpr; }
161 
162     /**
163      * Resets attribute values for tag reuse.
164      */
165     public void release()
166     {
167         super.release();
168         setValueExpr(null);
169         setContentExpr(null);
170         setDirectExpr(null);
171         setTypeExpr(null);
172         setBeanNameExpr(null);
173         setBeanPropertyExpr(null);
174         setBeanScopeExpr(null);
175         setRoleExpr(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("value", getValueExpr(),
198                                             this, pageContext)) != null)
199             setValue(string);
200         if ((string = EvalHelper.evalString("content", getContentExpr(),
201                                             this, pageContext)) != null)
202             setContent(string);
203         if ((string = EvalHelper.evalString("direct", getDirectExpr(),
204                                             this, pageContext)) != null)
205             setDirect(string);
206         if ((string = EvalHelper.evalString("type", getTypeExpr(),
207                                             this, pageContext)) != null)
208             setType(string);
209         if ((string = EvalHelper.evalString("beanName", getBeanNameExpr(),
210                                             this, pageContext)) != null)
211             setBeanName(string);
212         if ((string = EvalHelper.evalString("beanProperty", getBeanPropertyExpr(),
213                                             this, pageContext)) != null)
214             setBeanProperty(string);
215         if ((string = EvalHelper.evalString("beanScope", getBeanScopeExpr(),
216                                             this, pageContext)) != null)
217             setBeanScope(string);
218         if ((string = EvalHelper.evalString("role", getRoleExpr(),
219                                             this, pageContext)) != null)
220             setRole(string);
221     }
222 }
223
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