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.core.authz.support; 021 022 023import java.util.Collection; 024import java.util.Iterator; 025 026import org.apache.directory.api.ldap.aci.ACITuple; 027import org.apache.directory.api.ldap.model.entry.Entry; 028import org.apache.directory.api.ldap.model.exception.LdapException; 029 030 031/** 032 * An {@link ACITupleFilter} that discards all tuples having a precedence less 033 * than the highest remaining precedence. (18.8.4.1, X.501) 034 * 035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 036 */ 037public class HighestPrecedenceFilter implements ACITupleFilter 038{ 039 /** 040 * {@inheritDoc} 041 */ 042 @Override 043 public Collection<ACITuple> filter( AciContext aciContext, OperationScope scope, Entry userEntry ) 044 throws LdapException 045 { 046 ACI_LOG.debug( "Filtering HighestPrecedence..." ); 047 048 if ( aciContext.getAciTuples().size() <= 1 ) 049 { 050 ACI_LOG.debug( "HighestPrecedence : nothing to do" ); 051 return aciContext.getAciTuples(); 052 } 053 054 int maxPrecedence = -1; 055 056 // Find the maximum precedence for all tuples. 057 for ( ACITuple tuple : aciContext.getAciTuples() ) 058 { 059 if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() > maxPrecedence ) ) 060 { 061 maxPrecedence = tuple.getPrecedence(); 062 } 063 } 064 065 // Remove all tuples whose precedences are not the maximum one. 066 for ( Iterator<ACITuple> i = aciContext.getAciTuples().iterator(); i.hasNext(); ) 067 { 068 ACITuple tuple = i.next(); 069 070 if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() != maxPrecedence ) ) 071 { 072 i.remove(); 073 } 074 } 075 076 return aciContext.getAciTuples(); 077 } 078}