1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.server.core.authz.support;
21
22
23 import java.util.Collection;
24 import java.util.Iterator;
25
26 import org.apache.directory.api.ldap.aci.ACITuple;
27 import org.apache.directory.api.ldap.model.entry.Entry;
28 import org.apache.directory.api.ldap.model.exception.LdapException;
29
30
31 /**
32 * An {@link ACITupleFilter} that discards all tuples having a precedence less
33 * than the highest remaining precedence. (18.8.4.1, X.501)
34 *
35 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
36 */
37 public class HighestPrecedenceFilter implements ACITupleFilter
38 {
39 /**
40 * {@inheritDoc}
41 */
42 @Override
43 public Collection<ACITuple> filter( AciContext aciContext, OperationScope scope, Entry userEntry )
44 throws LdapException
45 {
46 ACI_LOG.debug( "Filtering HighestPrecedence..." );
47
48 if ( aciContext.getAciTuples().size() <= 1 )
49 {
50 ACI_LOG.debug( "HighestPrecedence : nothing to do" );
51 return aciContext.getAciTuples();
52 }
53
54 int maxPrecedence = -1;
55
56 // Find the maximum precedence for all tuples.
57 for ( ACITuple tuple : aciContext.getAciTuples() )
58 {
59 if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() > maxPrecedence ) )
60 {
61 maxPrecedence = tuple.getPrecedence();
62 }
63 }
64
65 // Remove all tuples whose precedences are not the maximum one.
66 for ( Iterator<ACITuple> i = aciContext.getAciTuples().iterator(); i.hasNext(); )
67 {
68 ACITuple tuple = i.next();
69
70 if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() != maxPrecedence ) )
71 {
72 i.remove();
73 }
74 }
75
76 return aciContext.getAciTuples();
77 }
78 }