AttributeTag


1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.taglibs.xtags.xpath;
18  
19  import java.io.IOException  ;
20  
21  import javax.servlet.ServletRequest  ;
22  import javax.servlet.jsp.JspTagException  ;
23  import javax.servlet.jsp.JspWriter  ;
24  import javax.servlet.jsp.PageContext  ;
25  import javax.servlet.jsp.tagext.Tag  ;
26  
27  /** Adds an XML attribute to the parent element tag like 
28    * the <code>&lt;xsl:attribute&gt;</code> tag.
29    *
30    * @author James Strachan
31    * @version $Revision: 1.2 $
32    */
33  public class AttributeTag extends AbstractBodyTag  {
34      
35      /** Holds attributeValue of property name. */
36      private String   name;
37      private ElementTag elementTag;
38      
39  
40      public AttributeTag() {
41      }
42      
43      // BodyTag interface
44      //-------------------------------------------------------------------------
45      public void release() {
46          super.release();
47          name = null;
48          elementTag = null;
49      }
50  
51      public int doStartTag() throws JspTagException   {
52          getElementTag().addAttribute( getName() );
53          return EVAL_BODY_TAG;
54      }
55      
56      public int doAfterBody() throws JspTagException   {
57          getElementTag().setAttributeValue( getName(), bodyContent.getString() );
58          bodyContent.clearBody();
59          return SKIP_BODY;
60      }
61      
62      // Properties
63      //-------------------------------------------------------------------------
64      
65      /** Getter for property name.
66       * @return AttributeValue of property name.
67       */
68      public String   getName() {
69          return name;
70      }
71      /** Setter for property name.
72       * @param name New attributeValue of property name.
73       */
74      public void setName(String   name) {
75          this.name = name;
76      }
77      
78      // Implementation methods
79      //-------------------------------------------------------------------------
80      protected ElementTag getElementTag() throws JspTagException   {
81          if ( elementTag != null ) {            
82              return elementTag;
83          }        
84          Tag   tag = findAncestorWithClass( this, ElementTag.class );
85          if ( tag != null ) {
86              if ( tag instanceof ElementTag ) {
87                  elementTag = (ElementTag) tag;
88                  return elementTag;
89              }
90          }
91          throw new JspTagException  ( "<attribute> tag must be enclosed inside an <element> tag" );
92      }
93  }
94
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