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 */
020package org.apache.directory.api.ldap.model.filter;
021
022
023import org.apache.directory.api.ldap.model.schema.AttributeType;
024
025
026/**
027 * Filter expression tree node representing a filter attribute value assertion
028 * for presence.
029 * 
030 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
031 */
032public final class PresenceNode extends LeafNode
033{
034    /**
035     * Creates a PresenceNode object based on an attribute.
036     * 
037     * @param attributeType the attributeType to assert the presence of
038     */
039    public PresenceNode( AttributeType attributeType )
040    {
041        super( attributeType, AssertionType.PRESENCE );
042    }
043
044
045    /**
046     * Creates a PresenceNode object based on an attribute.
047     * 
048     * @param attribute the attribute to assert the presence of
049     */
050    public PresenceNode( String attribute )
051    {
052        super( attribute, AssertionType.PRESENCE );
053    }
054
055
056    /**
057     * @see java.lang.Object#toString()
058     * @return A string representing the AndNode
059     */
060    @Override
061    public String toString()
062    {
063        StringBuilder buf = new StringBuilder();
064
065        buf.append( '(' );
066
067        if ( attributeType != null )
068        {
069            buf.append( attributeType.getName() );
070        }
071        else
072        {
073            buf.append( attribute );
074        }
075
076        buf.append( "=*" );
077
078        buf.append( super.toString() );
079
080        buf.append( ')' );
081
082        return buf.toString();
083    }
084}