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.server.core.event;
021    
022    
023    import org.apache.directory.server.i18n.I18n;
024    import org.apache.directory.shared.ldap.entry.ServerEntry;
025    import org.apache.directory.shared.ldap.exception.LdapException;
026    import org.apache.directory.shared.ldap.exception.LdapInvalidSearchFilterException;
027    import org.apache.directory.shared.ldap.filter.ExprNode;
028    import org.apache.directory.shared.ldap.filter.ScopeNode;
029    import org.apache.directory.shared.ldap.name.DN;
030    
031    
032    /**
033     * Evaluates ScopeNode assertions on candidates.
034     * 
035     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036     * @version $Rev: 927146 $
037     */
038    public class ScopeEvaluator implements Evaluator
039    {
040        public ScopeEvaluator()
041        {
042        }
043    
044    
045        /**
046         * @see Evaluator#evaluate(ExprNode , String, ServerEntry)
047         */
048        public boolean evaluate( ExprNode node, String dn, ServerEntry record ) throws LdapException
049        {
050            ScopeNode snode = ( ScopeNode ) node;
051    
052            switch ( snode.getScope() )
053            {
054                case OBJECT:
055                    return dn.equals( snode.getBaseDn() );
056                
057                case ONELEVEL:
058                    if ( dn.endsWith( snode.getBaseDn() ) )
059                    {
060                        DN candidateDn = new DN( dn );
061                        DN scopeDn = new DN( snode.getBaseDn() );
062                        return ( scopeDn.size() + 1 ) == candidateDn.size();
063                    }
064                
065                case SUBTREE:
066                    return dn.endsWith( snode.getBaseDn() );
067                
068                default:
069                    throw new LdapInvalidSearchFilterException( I18n.err( I18n.ERR_247 ) );
070            }
071        }
072    }