de.u808.simpleinquest.repository.impl.GenericHibernateDAO.java Source code

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Here is the source code for de.u808.simpleinquest.repository.impl.GenericHibernateDAO.java

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/*
 * Copyright 2008-2009 Andreas Friedel
 *
 * 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 de.u808.simpleinquest.repository.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.FetchMode;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Restrictions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.HibernateTemplate;

import de.u808.simpleinquest.repository.GenericDAO;

public abstract class GenericHibernateDAO<T, ID extends Serializable> implements GenericDAO<T, ID> {

    private Class<T> persistentClass;

    private HibernateTemplate hibernateTemplate;

    @Autowired
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.hibernateTemplate = new HibernateTemplate(sessionFactory);
    }

    public HibernateTemplate getHibernateTemplate() {
        return hibernateTemplate;
    }

    @SuppressWarnings("unchecked")
    public GenericHibernateDAO() {
        this.persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    public Class<T> getPersistentClass() {
        return persistentClass;
    }

    protected void setFetchModJoin(final String[] fetchList, Criteria criteria) {
        if (fetchList != null) {
            for (String aFetchList : fetchList) {
                criteria.setFetchMode(aFetchList, FetchMode.JOIN);
            }
        }
    }

    @SuppressWarnings("unchecked")
    public T findById(final ID id) {
        T entity;
        entity = (T) this.getHibernateTemplate().execute(new HibernateCallback() {
            public Object doInHibernate(Session session) {
                Criteria criteria = session.createCriteria(getPersistentClass());
                criteria.add(Restrictions.naturalId().set("id", id)).setCacheable(true).uniqueResult();
                return criteria.uniqueResult();
            }
        });
        return entity;
    }

    @SuppressWarnings("unchecked")
    public List<T> findAll() {
        return findByCriteria();
    }

    @SuppressWarnings("unchecked")
    public List<T> findByExample(T exampleInstance) {
        return hibernateTemplate.findByExample(exampleInstance);
    }

    @SuppressWarnings("unchecked")
    public T makePersistent(T entity) {
        getHibernateTemplate().saveOrUpdate(entity);
        return entity;
    }

    public void makeTransient(T entity) {
        getHibernateTemplate().delete(entity);
    }

    /**
     * Use this inside subclasses as a convenience method.
     */
    @SuppressWarnings("unchecked")
    protected List<T> findByCriteria(final Criterion... criterion) {
        return (List<T>) this.hibernateTemplate.execute(new HibernateCallback() {
            public Object doInHibernate(Session session) {
                Criteria criteria = session.createCriteria(getPersistentClass());
                for (Criterion c : criterion) {
                    criteria.add(c);
                }
                return criteria.list();
            }
        });
    }

}