/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.core.authz.support;
import java.util.Collection;
import java.util.Iterator;
import org.apache.directory.api.ldap.aci.ACITuple;
import org.apache.directory.api.ldap.model.entry.Entry;
import org.apache.directory.api.ldap.model.exception.LdapException;
/**
* An {@link ACITupleFilter} that discards all tuples having a precedence less
* than the highest remaining precedence. (18.8.4.1, X.501)
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class HighestPrecedenceFilter implements ACITupleFilter
{
public Collection<ACITuple> filter( AciContext aciContext, OperationScope scope, Entry userEntry )
throws LdapException
{
ACI_LOG.debug( "Filtering HighestPrecedence..." );
if ( aciContext.getAciTuples().size() <= 1 )
{
ACI_LOG.debug( "HighestPrecedence : nothing to do" );
return aciContext.getAciTuples();
}
int maxPrecedence = -1;
// Find the maximum precedence for all tuples.
for ( ACITuple tuple : aciContext.getAciTuples() )
{
if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() > maxPrecedence ) )
{
maxPrecedence = tuple.getPrecedence();
}
}
// Remove all tuples whose precedences are not the maximum one.
for ( Iterator<ACITuple> i = aciContext.getAciTuples().iterator(); i.hasNext(); )
{
ACITuple tuple = i.next();
if ( ( tuple.getPrecedence() != null ) && ( tuple.getPrecedence() != maxPrecedence ) )
{
i.remove();
}
}
return aciContext.getAciTuples();
}
}