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.authz.support;
021
022
023 import java.util.Collection;
024 import java.util.Iterator;
025
026 import javax.naming.NamingException;
027
028 import org.apache.directory.server.core.interceptor.context.OperationContext;
029 import org.apache.directory.shared.ldap.aci.ACITuple;
030 import org.apache.directory.shared.ldap.aci.MicroOperation;
031 import org.apache.directory.shared.ldap.constants.AuthenticationLevel;
032 import org.apache.directory.shared.ldap.entry.ServerEntry;
033 import org.apache.directory.shared.ldap.entry.Value;
034 import org.apache.directory.shared.ldap.name.DN;
035 import org.apache.directory.shared.ldap.schema.SchemaManager;
036
037
038 /**
039 * An {@link ACITupleFilter} that discards all tuples having a precedence less
040 * than the highest remaining precedence. (18.8.4.1, X.501)
041 *
042 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
043 * @version $Rev: 927146 $, $Date: 2010-03-24 20:39:54 +0200 (Wed, 24 Mar 2010) $
044 */
045 public class HighestPrecedenceFilter implements ACITupleFilter
046 {
047 public Collection<ACITuple> filter(
048 SchemaManager schemaManager,
049 Collection<ACITuple> tuples,
050 OperationScope scope,
051 OperationContext opContext,
052 Collection<DN> userGroupNames,
053 DN userName,
054 ServerEntry userEntry,
055 AuthenticationLevel authenticationLevel,
056 DN entryName,
057 String attrId,
058 Value<?> attrValue,
059 ServerEntry entry,
060 Collection<MicroOperation> microOperations,
061 ServerEntry entryView )
062 throws NamingException
063 {
064 if ( tuples.size() <= 1 )
065 {
066 return tuples;
067 }
068
069 int maxPrecedence = -1;
070
071 // Find the maximum precedence for all tuples.
072 for ( ACITuple tuple:tuples )
073 {
074 if ( tuple.getPrecedence() > maxPrecedence )
075 {
076 maxPrecedence = tuple.getPrecedence();
077 }
078 }
079
080 // Remove all tuples whose precedences are not the maximum one.
081 for ( Iterator<ACITuple> i = tuples.iterator(); i.hasNext(); )
082 {
083 ACITuple tuple = i.next();
084
085 if ( tuple.getPrecedence() != maxPrecedence )
086 {
087 i.remove();
088 }
089 }
090
091 return tuples;
092 }
093 }