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.server.xdbm.search.evaluator;
021
022
023import org.apache.directory.api.ldap.model.entry.Entry;
024import org.apache.directory.api.ldap.model.exception.LdapException;
025import org.apache.directory.api.ldap.model.filter.ExprNode;
026import org.apache.directory.api.ldap.model.filter.NotNode;
027import org.apache.directory.server.core.api.partition.PartitionTxn;
028import org.apache.directory.server.xdbm.IndexEntry;
029import org.apache.directory.server.xdbm.search.Evaluator;
030
031
032/**
033 * An Evaluator for logical negation (NOT) expressions.
034 *
035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036 */
037public class NotEvaluator implements Evaluator<NotNode>
038{
039    /** The ExprNode to evaluate */
040    private final NotNode node;
041
042    /** The Evaluator to use for the inner Node */
043    private final Evaluator<? extends ExprNode> childEvaluator;
044
045
046    /**
047     * Creates a new NotEvaluator
048     * 
049     * @param node The NotNode
050     * @param childEvaluator The included evaluator
051     */
052    public NotEvaluator( NotNode node, Evaluator<? extends ExprNode> childEvaluator )
053    {
054        this.node = node;
055        this.childEvaluator = childEvaluator;
056    }
057
058
059    /**
060     * {@inheritDoc}
061     */
062    @Override
063    public boolean evaluate( Entry entry ) throws LdapException
064    {
065        return !childEvaluator.evaluate( entry );
066    }
067
068
069    /**
070     * {@inheritDoc}
071     */
072    @Override
073    public boolean evaluate( PartitionTxn partitionTxn, IndexEntry<?, String> indexEntry ) throws LdapException
074    {
075        return !childEvaluator.evaluate( partitionTxn, indexEntry );
076    }
077
078
079    /**
080     * {@inheritDoc}
081     */
082    @Override
083    public NotNode getExpression()
084    {
085        return node;
086    }
087
088
089    /**
090     * @see Object#toString()
091     */
092    public String toString( String tabs )
093    {
094        StringBuilder sb = new StringBuilder();
095
096        sb.append( tabs ).append( "NotEvaluator : " ).append( node ).append( '\n' );
097
098        sb.append( childEvaluator.toString( tabs + "  " ) );
099
100        return sb.toString();
101    }
102
103
104    /**
105     * @see Object#toString()
106     */
107    public String toString()
108    {
109        return toString( "" );
110    }
111}