/**
* Licensed to Jasig under one or more contributor license
* agreements. See the NOTICE file distributed with this work
* for additional information regarding copyright ownership.
* Jasig 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.jasig.portal.groups;
import org.jasig.portal.spring.locator.PersonAttributeDaoLocator;
import org.jasig.services.persondir.IPersonAttributeDao;
/**
* Factory for creating and obtaining reference to
* a static singleton <code>PersonDirNameFinder</code>.
* @author Alex Vigdor
* @version $Revision$
*/
public class PersonDirNameFinderFactory implements IEntityNameFinderFactory {
/**
* Lazily initialized static singleton PersonDirNameFinder backed
* by the IPersonAttributeDao provided by the PersonDirectory static service.
*/
private static PersonDirNameFinder PERSON_DIR_NAME_FINDER_INSTANCE;
/**
* Do-nothing constructor.
*/
public PersonDirNameFinderFactory() {
super();
}
/**
* Get the static singleton PersonDirNameFinder instance backed by
* PersonDirectory.
*
* @return the static singleton PersonDirNameFinder backed by PersonDirectory
*/
public IEntityNameFinder newFinder() {
if (PERSON_DIR_NAME_FINDER_INSTANCE == null) {
PersonDirNameFinderFactory.storeSingleton();
}
return PERSON_DIR_NAME_FINDER_INSTANCE;
}
/**
* Intantiates the static singleton field PERSON_DIR_NAME_FINDER_INSTANCE.
* Synchronized to guarantee singletonness of the field.
*/
private synchronized static void storeSingleton() {
// recheck that we need to run because field could have been
// set since we decided to invoke this method but before we acquired
// the lock on this object
if (PERSON_DIR_NAME_FINDER_INSTANCE == null) {
IPersonAttributeDao personAttributeDao = PersonAttributeDaoLocator
.getPersonAttributeDao();
PERSON_DIR_NAME_FINDER_INSTANCE = new PersonDirNameFinder(
personAttributeDao);
}
}
}