ELIncludeTag


1   /*
2    * $Id: ELIncludeTag.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 org.apache.struts.taglib.bean.IncludeTag;
22  import javax.servlet.jsp.JspException  ;
23  import org.apache.strutsel.taglib.utils.EvalHelper;
24  
25  /**
26   * Generate a URL-encoded include to the specified URI.
27   *<p>
28   * This class is a subclass of the class
29   * <code>org.apache.struts.taglib.bean.IncludeTag</code> which
30   * provides most of the described functionality.  This subclass allows all
31   * attribute values to be specified as expressions utilizing the JavaServer
32   * Pages Standard Library expression language.
33   *
34   * @version $Rev: 54933 $
35   */
36  public class ELIncludeTag extends IncludeTag {
37  
38      /**
39       * Instance variable mapped to "anchor" tag attribute.
40       * (Mapping set in associated BeanInfo class.)
41       */
42      private String   anchorExpr;
43      /**
44       * Instance variable mapped to "forward" tag attribute.
45       * (Mapping set in associated BeanInfo class.)
46       */
47      private String   forwardExpr;
48      /**
49       * Instance variable mapped to "href" tag attribute.
50       * (Mapping set in associated BeanInfo class.)
51       */
52      private String   hrefExpr;
53      /**
54       * Instance variable mapped to "id" tag attribute.
55       * (Mapping set in associated BeanInfo class.)
56       */
57      private String   idExpr;
58      /**
59       * Instance variable mapped to "name" tag attribute.
60       * (Mapping set in associated BeanInfo class.)
61       */
62      private String   nameExpr;
63      /**
64       * Instance variable mapped to "page" tag attribute.
65       * (Mapping set in associated BeanInfo class.)
66       */
67      private String   pageExpr;
68      /**
69       * Instance variable mapped to "transaction" tag attribute.
70       * (Mapping set in associated BeanInfo class.)
71       */
72      private String   transactionExpr;
73  
74      /**
75       * Getter method for "anchor" tag attribute.
76       * (Mapping set in associated BeanInfo class.)
77       */
78      public String   getAnchorExpr() { return (anchorExpr); }
79      /**
80       * Getter method for "forward" tag attribute.
81       * (Mapping set in associated BeanInfo class.)
82       */
83      public String   getForwardExpr() { return (forwardExpr); }
84      /**
85       * Getter method for "href" tag attribute.
86       * (Mapping set in associated BeanInfo class.)
87       */
88      public String   getHrefExpr() { return (hrefExpr); }
89      /**
90       * Getter method for "id" tag attribute.
91       * (Mapping set in associated BeanInfo class.)
92       */
93      public String   getIdExpr() { return (idExpr); }
94      /**
95       * Getter method for "name" tag attribute.
96       * (Mapping set in associated BeanInfo class.)
97       */
98      public String   getNameExpr() { return (nameExpr); }
99      /**
100      * Getter method for "page" tag attribute.
101      * (Mapping set in associated BeanInfo class.)
102      */
103     public String   getPageExpr() { return (pageExpr); }
104     /**
105      * Getter method for "transaction" tag attribute.
106      * (Mapping set in associated BeanInfo class.)
107      */
108     public String   getTransactionExpr() { return (transactionExpr); }
109 
110     /**
111      * Setter method for "anchor" tag attribute.
112      * (Mapping set in associated BeanInfo class.)
113      */
114     public void setAnchorExpr(String   anchorExpr) { this.anchorExpr = anchorExpr; }
115     /**
116      * Setter method for "forward" tag attribute.
117      * (Mapping set in associated BeanInfo class.)
118      */
119     public void setForwardExpr(String   forwardExpr) { this.forwardExpr = forwardExpr; }
120     /**
121      * Setter method for "href" tag attribute.
122      * (Mapping set in associated BeanInfo class.)
123      */
124     public void setHrefExpr(String   hrefExpr) { this.hrefExpr = hrefExpr; }
125     /**
126      * Setter method for "id" tag attribute.
127      * (Mapping set in associated BeanInfo class.)
128      */
129     public void setIdExpr(String   idExpr) { this.idExpr = idExpr; }
130     /**
131      * Setter method for "name" tag attribute.
132      * (Mapping set in associated BeanInfo class.)
133      */
134     public void setNameExpr(String   nameExpr) { this.nameExpr = nameExpr; }
135     /**
136      * Setter method for "page" tag attribute.
137      * (Mapping set in associated BeanInfo class.)
138      */
139     public void setPageExpr(String   pageExpr) { this.pageExpr = pageExpr; }
140     /**
141      * Setter method for "transaction" tag attribute.
142      * (Mapping set in associated BeanInfo class.)
143      */
144     public void setTransactionExpr(String   transactionExpr) { this.transactionExpr = transactionExpr; }
145 
146     /**
147      * Resets attribute values for tag reuse.
148      */
149     public void release()
150     {
151         super.release();
152         setAnchorExpr(null);
153         setForwardExpr(null);
154         setHrefExpr(null);
155         setIdExpr(null);
156         setNameExpr(null);
157         setPageExpr(null);
158         setTransactionExpr(null);
159     }
160 
161     /**
162      * Process the start tag.
163      *
164      * @exception JspException if a JSP exception has occurred
165      */
166     public int doStartTag() throws JspException   {
167         evaluateExpressions();
168         return (super.doStartTag());
169     }
170 
171     /**
172      * Processes all attribute values which use the JSTL expression evaluation
173      * engine to determine their values.
174      *
175      * @exception JspException if a JSP exception has occurred
176      */
177     private void evaluateExpressions() throws JspException   {
178         String    string  = null;
179         Boolean   bool    = null;
180 
181         if ((string = EvalHelper.evalString("anchor", getAnchorExpr(),
182                                             this, pageContext)) != null)
183             setAnchor(string);
184 
185         if ((string = EvalHelper.evalString("forward", getForwardExpr(),
186                                             this, pageContext)) != null)
187             setForward(string);
188 
189         if ((string = EvalHelper.evalString("href", getHrefExpr(),
190                                             this, pageContext)) != null)
191             setHref(string);
192 
193         if ((string = EvalHelper.evalString("id", getIdExpr(),
194                                             this, pageContext)) != null)
195             setId(string);
196 
197         if ((string = EvalHelper.evalString("name", getNameExpr(),
198                                             this, pageContext)) != null)
199             setName(string);
200 
201         if ((string = EvalHelper.evalString("page", getPageExpr(),
202                                             this, pageContext)) != null)
203             setPage(string);
204 
205         if ((bool = EvalHelper.evalBoolean("transaction", getTransactionExpr(),
206                                            this, pageContext)) != null)
207             setTransaction(bool.booleanValue());
208     }
209 }
210
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