/*
* JBoss DNA (http://www.jboss.org/dna)
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
* See the AUTHORS.txt file in the distribution for a full listing of
* individual contributors.
*
* JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
* is licensed to you under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* JBoss DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.dna.connector.store.jpa.util;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManager;
import net.jcip.annotations.NotThreadSafe;
import org.jboss.dna.connector.store.jpa.model.common.NamespaceEntity;
/**
* @author Randall Hauch
*/
@NotThreadSafe
public class Namespaces {
private final EntityManager entityManager;
private final Map<String, NamespaceEntity> cache = new HashMap<String, NamespaceEntity>();
public Namespaces( EntityManager manager ) {
this.entityManager = manager;
}
public NamespaceEntity get( String namespaceUri,
boolean createIfRequired ) {
NamespaceEntity entity = cache.get(namespaceUri);
if (entity == null) {
entity = NamespaceEntity.findByUri(entityManager, namespaceUri, createIfRequired);
if (entity != null) {
cache.put(namespaceUri, entity);
}
}
return entity;
}
}