/*
* 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.studio.connection.core.io.jndi;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;
import javax.naming.LinkLoopException;
import org.apache.directory.api.ldap.model.message.Referral;
/**
* Helper class that holds info about referrals to be processed and
* already processed referrals.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class ReferralsInfo
{
private LinkedList<Referral> referralsToProcess = new LinkedList<Referral>();
private Set<String> processedUrls = new HashSet<String>();
private boolean throwExceptionOnLoop;
/**
* Creates a new instance of ReferralsInfo.
*
* @param throwExceptionOnLoop if an exception should be thrown when a referral loop is detected.
*/
public ReferralsInfo( boolean throwExceptionOnLoop )
{
this.throwExceptionOnLoop = throwExceptionOnLoop;
}
/**
* Adds the referral entry to the list of referrals to be processed.
*
* @param referral the referral
*/
public void addReferral( Referral referral )
{
referralsToProcess.addLast( referral );
}
/**
* Gets the next referral or null.
*
* @return the next referral or null
* @throws LinkLoopException
*/
public Referral getNextReferral() throws LinkLoopException
{
handleAlreadyProcessedUrls();
if ( !referralsToProcess.isEmpty() )
{
Referral referral = referralsToProcess.removeFirst();
processedUrls.addAll( referral.getLdapUrls() );
return referral;
}
else
{
return null;
}
}
/**
* Checks for more referrals.
*
* @return true, if there are more referrals
* @throws LinkLoopException
*/
public boolean hasMoreReferrals() throws LinkLoopException
{
handleAlreadyProcessedUrls();
return !referralsToProcess.isEmpty();
}
private void handleAlreadyProcessedUrls() throws LinkLoopException
{
while ( !referralsToProcess.isEmpty() )
{
Referral referral = referralsToProcess.getFirst();
boolean alreadyProcessed = referral.getLdapUrls().stream().anyMatch( url -> processedUrls.contains( url ) );
if ( alreadyProcessed )
{
// yes, already processed, remove the current referral and continue with filtering
if ( throwExceptionOnLoop )
{
throw new LinkLoopException( "Referral " + referral.getLdapUrls() + " already processed" );
}
else
{
referralsToProcess.removeFirst();
}
}
else
{
// no, not yet processed, done with filtering
return;
}
}
}
}