ELPutListTag


1   /*
2    * $Id: ELPutListTag.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.PutListTag;
22  import javax.servlet.jsp.JspException  ;
23  import org.apache.strutsel.taglib.utils.EvalHelper;
24  
25  /**
26   * PutList tag implementation.
27   *<p>
28   * This class is a subclass of the class
29   * <code>org.apache.struts.taglib.tiles.PutListTag</code> which provides most of
30   * the described functionality.  This subclass allows all attribute values to
31   * be specified as expressions utilizing the JavaServer Pages Standard Library
32   * expression language.
33   *
34   * @version $Rev: 54933 $
35   */
36  public class ELPutListTag extends PutListTag {
37  
38      /**
39       * Instance variable mapped to "name" tag attribute.
40       * (Mapping set in associated BeanInfo class.)
41       */
42      private String   nameExpr;
43  
44      /**
45       * Getter method for "name" tag attribute.
46       * (Mapping set in associated BeanInfo class.)
47       */
48      public String   getNameExpr() { return (nameExpr); }
49  
50      /**
51       * Setter method for "name" tag attribute.
52       * (Mapping set in associated BeanInfo class.)
53       */
54      public void setNameExpr(String   nameExpr) { this.nameExpr = nameExpr; }
55  
56      /**
57       * Resets attribute values for tag reuse.
58       */
59      public void release()
60      {
61          super.release();
62          setNameExpr(null);
63      }
64      
65      /**
66       * Process the start tag.
67       *
68       * @exception JspException if a JSP exception has occurred
69       */
70      public int doStartTag() throws JspException   {
71          evaluateExpressions();
72          return (super.doStartTag());
73      }
74      
75      /**
76       * Processes all attribute values which use the JSTL expression evaluation
77       * engine to determine their values.
78       *
79       * @exception JspException if a JSP exception has occurred
80       */
81      private void evaluateExpressions() throws JspException   {
82          String    string  = null;
83  
84          if ((string = EvalHelper.evalString("name", getNameExpr(),
85                                              this, pageContext)) != null)
86              setName(string);
87      }
88  }
89
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