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1   /*
2    *   Licensed to the Apache Software Foundation (ASF) under one
3    *   or more contributor license agreements.  See the NOTICE file
4    *   distributed with this work for additional information
5    *   regarding copyright ownership.  The ASF licenses this file
6    *   to you under the Apache License, Version 2.0 (the
7    *   "License"); you may not use this file except in compliance
8    *   with the License.  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,
13   *   software distributed under the License is distributed on an
14   *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *   KIND, either express or implied.  See the License for the
16   *   specific language governing permissions and limitations
17   *   under the License.
18   *
19   */
20  package org.apache.directory.ldap.client.api.search;
21  
22  
23  /**
24   * Creates a NOT filter
25   *
26   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
27   */
28  /* No qualifier*/final class UnaryFilter extends AbstractFilter
29  {
30      /** The NOT filter */
31      private Filter filter;
32  
33  
34      /**
35       * Creates a new instance of UnaryFilter.
36       */
37      private UnaryFilter()
38      {
39      }
40  
41  
42      /**
43       * Constructs a NOT filter 
44       *
45       * @return The constructed NOT Filter
46       */
47      public static UnaryFilter not()
48      {
49          return new UnaryFilter();
50      }
51  
52  
53      /**
54       * Constructs a NOT filter with the associated inner Filter
55       *
56       * @param filter The inner Filter
57       * @return The constructed NOT Filter
58       */
59      public static UnaryFilter not( Filter filter )
60      {
61          UnaryFilter notFilter = not();
62          notFilter.filter = filter;
63  
64          return notFilter;
65      }
66  
67  
68      /**
69       * {@inheritDoc}
70       */
71      @Override
72      public StringBuilder build( StringBuilder builder )
73      {
74          if ( filter == null )
75          {
76              throw new IllegalStateException( "filter not set" );
77          }
78  
79          builder.append( "(" ).append( FilterOperator.NOT.operator() );
80          filter.build( builder );
81  
82          return builder.append( ")" );
83      }
84  }