RemoveTag


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.util.Iterator  ;
20  import java.util.List  ;
21  
22  import javax.servlet.jsp.JspException  ;
23  
24  import org.dom4j.Node;
25  import org.dom4j.XPath;
26  
27  /** The remove tag removes nodes from the current document which matches
28    * the given XPath expression.
29    *
30    * @author James Strachan
31    */
32  public class RemoveTag extends AbstractTag {
33      
34      /** Holds the XPath selection instance. */
35      private XPath xpath;
36      
37      public RemoveTag() {
38      }
39  
40      
41      // BodyTag interface
42      //------------------------------------------------------------------------- 
43      public int doStartTag() throws JspException    {        
44          if ( xpath != null ) {
45              List   list = xpath.selectNodes( getInputNodes() );
46              if ( list != null ) {
47                  for ( Iterator   iter = list.iterator(); iter.hasNext(); ) {
48                      Object   value = iter.next();
49                      if ( value instanceof Node ) {
50                          Node node = (Node) value;
51                          node.detach();
52                      }
53                  }
54              }
55          }
56          return SKIP_BODY;
57      }
58  
59      public void release() {
60          super.release();
61          xpath = null;
62      }
63  
64      
65      // Properties
66      //-------------------------------------------------------------------------                    
67      
68      /** Sets the select XPath expression
69        */
70      public void setSelect(String   select) {
71          this.xpath = createXPath( select );
72      }
73  
74      /** Sets the XPath selection expression
75        */
76      public void setSelectXPath(XPath xpath) {
77          this.xpath = xpath;
78      }
79      
80  }
81
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