package org.bat.client.persistence;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import org.bat.client.persistence.interfaces.GenericDAO;
import org.hibernate.Criteria;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Example;
public abstract class GenericHibernateDAO<T, ID extends Serializable>
implements GenericDAO<T, ID> {
private Class<T> persistentClass;
private Session session;
@SuppressWarnings("unchecked")
public GenericHibernateDAO() {
this.persistentClass = (Class<T>) ((ParameterizedType) getClass()
.getGenericSuperclass()).getActualTypeArguments()[0];
}
public void setSession(Session s) {
this.session = s;
}
protected Session getSession() {
if (session == null)
throw new IllegalStateException("Session has not been set on DAO before usage");
return session;
}
public Class<T> getPersistentClass() {
return persistentClass;
}
@SuppressWarnings("unchecked")
public T findById(ID id, boolean lock) {
T entity;
if (lock)
entity = (T) getSession().load(getPersistentClass(), id, LockMode.UPGRADE);
else
entity = (T) getSession().load(getPersistentClass(), id);
return entity;
}
public List<T> findAll() {
return findByCriteria();
}
@SuppressWarnings("unchecked")
public List<T> findByExample(T exampleInstance, String... excludeProperty) {
Criteria crit = getSession().createCriteria(getPersistentClass());
Example example = Example.create(exampleInstance);
for (String exclude : excludeProperty) {
example.excludeProperty(exclude);
}
crit.add(example);
return crit.list();
}
public T makePersistent(T entity) {
getSession().saveOrUpdate(entity);
return entity;
}
public void makeTransient(T entity) {
getSession().delete(entity);
}
public void flush() {
getSession().flush();
}
public void clear() {
getSession().clear();
}
/**
* Use this inside subclasses as a convenience method.
*/
@SuppressWarnings("unchecked")
protected List<T> findByCriteria(Criterion... criterion) {
Criteria crit = getSession().createCriteria(getPersistentClass());
for (Criterion c : criterion) {
crit.add(c);
}
return crit.list();
}
}