001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.shared.ldap.filter;
021    
022    
023    /**
024     * Filter expression tree node representing a filter attribute value assertion
025     * for presence.
026     * 
027     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
028     * @version $Revision: 746607 $
029     */
030    public final class PresenceNode extends LeafNode
031    {
032        /**
033         * Creates a PresenceNode object based on an attribute.
034         * 
035         * @param attribute the attribute to assert the presence of
036         */
037        public PresenceNode( String attribute )
038        {
039            super( attribute, AssertionType.PRESENCE );
040        }
041    
042        
043        /**
044         * Clone the Node
045         */
046        @Override public ExprNode clone()
047        {
048            return super.clone();
049        }
050    
051        /**
052         * @see java.lang.Object#toString()
053         * @return A string representing the AndNode
054         */
055        public String toString()
056        {
057            StringBuilder buf = new StringBuilder();
058            
059            buf.append( '(' ).append( getAttribute() ).append( "=*" );
060    
061            buf.append( super.toString() );
062    
063            buf.append( ')' );
064            
065            return buf.toString();
066        }
067    }