Java tutorial
/** * Copyright (c) 2014-2015 Eclectic Logic LLC * * 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 com.eclecticlogic.pedal.provider.hibernate; import java.io.Serializable; import java.sql.Connection; import java.sql.SQLException; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.engine.spi.SessionFactoryImplementor; import org.hibernate.jdbc.ReturningWork; import org.hibernate.jdbc.Work; import org.hibernate.jpa.HibernateEntityManagerFactory; import org.hibernate.metadata.ClassMetadata; import org.hibernate.persister.entity.SingleTableEntityPersister; import com.eclecticlogic.pedal.provider.Consumer; import com.eclecticlogic.pedal.provider.Function; import com.eclecticlogic.pedal.provider.ProviderAccessSpi; /** * Get provider specific information. * @author kabram. * */ public class HibernateProviderAccessSpiImpl implements ProviderAccessSpi { private EntityManagerFactory emf; public void setEntityManagerFactory(EntityManagerFactory emf) { this.emf = emf; } @Override public String getSchemaName() { SessionFactory sf = emf.unwrap(HibernateEntityManagerFactory.class).getSessionFactory(); SessionFactoryImplementor sfi = (SessionFactoryImplementor) sf; String schema = sfi.getSettings().getDefaultSchemaName(); return schema == null ? "" : schema; } /** * @param entityClass Entity class for which the table name is required. * @return Table name if the entity class is a single table. */ @Override public String getTableName(Class<? extends Serializable> entityClass) { SessionFactory sf = emf.unwrap(HibernateEntityManagerFactory.class).getSessionFactory(); ClassMetadata metadata = sf.getClassMetadata(entityClass); if (metadata instanceof SingleTableEntityPersister) { SingleTableEntityPersister step = (SingleTableEntityPersister) metadata; return step.getTableName(); } else { return null; } } @Override public void run(EntityManager entityManager, final Consumer<Connection> work) { Session session = entityManager.unwrap(Session.class); session.doWork(new Work() { @Override public void execute(Connection connection) throws SQLException { work.accept(connection); } }); } @Override public <R> R exec(EntityManager entityManager, final Function<Connection, R> work) { Session session = entityManager.unwrap(Session.class); return session.doReturningWork(new ReturningWork<R>() { @Override public R execute(Connection connection) throws SQLException { return work.apply(connection); } }); } }