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 javax.naming.NamingException;
27
28 import org.apache.directory.server.core.entry.ServerEntry;
29 import org.apache.directory.server.core.interceptor.context.OperationContext;
30 import org.apache.directory.server.schema.registries.Registries;
31 import org.apache.directory.shared.ldap.aci.ACITuple;
32 import org.apache.directory.shared.ldap.aci.MicroOperation;
33 import org.apache.directory.shared.ldap.constants.AuthenticationLevel;
34 import org.apache.directory.shared.ldap.entry.Value;
35 import org.apache.directory.shared.ldap.name.LdapDN;
36
37
38 /**
39 * An {@link ACITupleFilter} that discards all tuples having a precedence less
40 * than the highest remaining precedence. (18.8.4.1, X.501)
41 *
42 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
43 * @version $Rev: 664295 $, $Date: 2008-06-07 09:48:16 +0200 (Sa, 07 Jun 2008) $
44 */
45 public class HighestPrecedenceFilter implements ACITupleFilter
46 {
47 public Collection<ACITuple> filter(
48 Registries registries,
49 Collection<ACITuple> tuples,
50 OperationScope scope,
51 OperationContext opContext,
52 Collection<LdapDN> userGroupNames,
53 LdapDN userName,
54 ServerEntry userEntry,
55 AuthenticationLevel authenticationLevel,
56 LdapDN entryName,
57 String attrId,
58 Value<?> attrValue,
59 ServerEntry entry,
60 Collection<MicroOperation> microOperations,
61 ServerEntry entryView )
62 throws NamingException
63 {
64 if ( tuples.size() <= 1 )
65 {
66 return tuples;
67 }
68
69 int maxPrecedence = -1;
70
71 // Find the maximum precedence for all tuples.
72 for ( ACITuple tuple:tuples )
73 {
74 if ( tuple.getPrecedence() > maxPrecedence )
75 {
76 maxPrecedence = tuple.getPrecedence();
77 }
78 }
79
80 // Remove all tuples whose precedences are not the maximum one.
81 for ( Iterator<ACITuple> i = tuples.iterator(); i.hasNext(); )
82 {
83 ACITuple tuple = i.next();
84
85 if ( tuple.getPrecedence() != maxPrecedence )
86 {
87 i.remove();
88 }
89 }
90
91 return tuples;
92 }
93 }