com.britesnow.snow.web.db.hibernate.HibernateDaoHelperImpl Maven / Gradle / Ivy

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/* Copyright 2009 Jeremy Chone - Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 */
package com.britesnow.snow.web.db.hibernate;

import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

import com.britesnow.snow.web.db.hibernate.annotation.Transactional;
import com.google.inject.Singleton;

/**
 * 
 * Helper Class to access Hibernate Session functions. Note that this class uses
 * SessionHolder and assumes that HibernateHandler.openSessionInView has been
 * called.
 * 
 * @author Jeremy Chone
 * @date Jul 30, 2009
 */
@Singleton
public class HibernateDaoHelperImpl implements HibernateDaoHelper {

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#get(java.lang.Class, java.io.Serializable)
     */
    @SuppressWarnings("unchecked")
    public  T get(Class cls, Serializable id) {
        try {
            if (cls != null && id != null) {
                return (T) getSession().get(cls, id);
            } else {
                return null;
            }
        } catch (Throwable e) {            
            throw new SnowHibernateException(e);
        }

    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#save(T)
     */
    @Transactional
    public  T save(T entity) {

        Session session = getSession();
        try {
            session.save(entity);
        } catch (Throwable e) {
            throw new SnowHibernateException(e);
        }

        return entity;
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#update(T)
     */
    @Transactional
    public  T update(T entity) {
        Session session = getSession();
        try {
            session.update(entity);
        } catch (Throwable e) {
            throw new SnowHibernateException(e);
        }
        return entity;
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#saveEntities(java.util.List)
     */
    @Transactional
    public void saveEntities(List entities) {
        for (Object entity : entities) {
            save(entity);
        }
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#saveEntities(java.lang.Object)
     */
    @Transactional
    public void saveEntities(Object... entities) {
        for (Object entity : entities) {
            save(entity);
        }
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#delete(java.lang.Class, java.io.Serializable)
     */
    @SuppressWarnings("unchecked")
    @Transactional
    public void delete(Class cls, Serializable id) {
        if (id != null) {
            Object entity = get(cls, id);
            delete(entity);
        }

    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#delete(java.lang.Object)
     */
    @Transactional
    public void delete(Object entity) {
        if (entity != null) {
            try {
                getSession().delete(entity);
            } catch (Throwable e) {
                throw new SnowHibernateException(e);
            }
        }
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#deleteEntities(java.util.List)
     */
    @Transactional
    public void deleteEntities(List entities) {
        if (entities != null) {
            for (Object entity : entities) {
                delete(entity);
            }
        }
    }

    /* (non-Javadoc)
     * @see org.snowfk.web.db.hibernate.HibernateDaoHelper#findFirst(java.lang.String, java.lang.Object)
     */
    @SuppressWarnings("unchecked")
    public Object findFirst(String query, Object... values) {
        List