NullFilter


1   /*
2    * ====================================================================
3    * 
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 1999-2003 The Apache Software Foundation.  All rights 
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer. 
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution, if
22   *    any, must include the following acknowlegement:  
23   *       "This product includes software developed by the 
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowlegement may appear in the software itself,
26   *    if and wherever such third-party acknowlegements normally appear.
27   *
28   * 4. The names "The Jakarta Project", "Jakarta Element Construction Set", 
29   *    "Jakarta ECS" , and "Apache Software Foundation" must not be used 
30   *    to endorse or promote products derived
31   *    from this software without prior written permission. For written 
32   *    permission, please contact apache@apache.org.
33   *
34   * 5. Products derived from this software may not be called "Apache",
35   *    "Jakarta Element Construction Set" nor "Jakarta ECS" nor may "Apache" 
36   *    appear in their names without prior written permission of the Apache Group.
37   *
38   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
39   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
40   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
42   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
44   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
45   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
46   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
47   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
48   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49   * SUCH DAMAGE.
50   * ====================================================================
51   *
52   * This software consists of voluntary contributions made by many
53   * individuals on behalf of the Apache Software Foundation.  For more
54   * information on the Apache Software Foundation, please see
55   * <http://www.apache.org/>.
56   *
57   */
58   
59  package org.apache.ecs.filter;
60  
61  import org.apache.ecs.*;
62  
63  
64  /**
65  A filter for ECS that doesn't do anything.
66  
67  */
68  
69  public class NullFilter implements Filter {
70      
71      public Filter addAttribute(String   name, Object   attribute) {
72          return this;
73      }
74      
75      public Filter removeAttribute(String   name) {
76          return this;
77      }
78      
79      public boolean hasAttribute(String   name) {
80          return false;
81      }
82      
83      public String   process(String   to_process) {
84          return to_process;
85      }
86      
87      public String   getInfo() {
88          return "info";
89      }
90      
91  }
92
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