/* Copyright 2002, 2005 The JA-SIG Collaborative. All rights reserved.
* See license distributed with this file and
* available online at http://www.uportal.org/license.html
*/
package org.jasig.portal.groups;
import org.jasig.portal.services.PersonDirectory;
import org.jasig.portal.services.persondir.IPersonAttributeDao;
/**
* Factory for creating and obtaining reference to
* a static singleton <code>PersonDirNameFinder</code>.
* @author Alex Vigdor
* @version $Revision: 1.6 $
*/
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 = PersonDirectory
.getPersonAttributeDao();
PERSON_DIR_NAME_FINDER_INSTANCE = new PersonDirNameFinder(
personAttributeDao);
}
}
}