package org.jrest4guice.persistence;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import org.jrest4guice.guice.GuiceContext;
import org.jrest4guice.guice.InjectorContext;
import org.jrest4guice.guice.PersistenceGuiceContext;
import org.jrest4guice.persistence.hibernate.HibernateEntityManager;
import org.jrest4guice.persistence.hibernate.SessionProvider;
import org.jrest4guice.persistence.jpa.EntityManagerProvider;
import org.jrest4guice.persistence.jpa.JpaEntityManager;
import sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl;
import com.google.inject.Provider;
/**
*
* @author <a href="mailto:zhangyouqun@gmail.com">cnoss (QQ:86895156)</a>
*
*/
@SuppressWarnings("unchecked")
public class BaseEntityManagerProvider implements Provider<BaseEntityManager> {
public BaseEntityManager get() {
Field field = InjectorContext.currentField();
Class<?> clazz = String.class;
Type genericType = field.getGenericType();
if(genericType instanceof ParameterizedTypeImpl){
ParameterizedTypeImpl pgType = (ParameterizedTypeImpl)genericType;
Type[] actualTypeArguments = pgType.getActualTypeArguments();
clazz = (Class<?>)actualTypeArguments[1];
}
// System.out.println("泛行的类型："+clazz.getName());
BaseEntityManager em = null;
if(PersistenceGuiceContext.getInstance().isUseJPA())
em = new JpaEntityManager(clazz,GuiceContext.getInstance().getBean(EntityManagerProvider.class).get());
else if(PersistenceGuiceContext.getInstance().isUseHibernate())
em = new HibernateEntityManager(clazz,GuiceContext.getInstance().getBean(SessionProvider.class).get());
return em;
}
}