examples.greeting.ListGreetings Maven / Gradle / Ivy
/*
* Copyright 2016-2017 Testify Project.
*
* Licensed 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 examples.greeting;
import examples.greeting.entity.GreetingEntity;
import java.util.Collection;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.transaction.Transactional;
import org.jvnet.hk2.annotations.Service;
/**
* A service that retrieves all greetings.
*
* @author saden
*/
@Transactional
@Service
public class ListGreetings {
private final EntityManager entityManager;
@Inject
ListGreetings(EntityManager entityManager) {
this.entityManager = entityManager;
}
/**
* Get all greetings.
*
* @return a collection of all the greetings, empty collection otherwise
*/
public Collection listGreetings() {
Query query = entityManager.createQuery("SELECT g FROM GreetingEntity g");
return query.getResultList();
}
}