generichibernatedao.java

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package dao;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Example;
import org.hibernate.criterion.MatchMode;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import dao.GenericDAO;

public class GenericHibernateDAO<T, ID extends Serializable>
		extends HibernateDaoSupport implements GenericDAO<T, ID> {
	public Log log = LogFactory.getLog(GenericHibernateDAO.class);
	private Class<T> persistentClass;
	
    public GenericHibernateDAO(Class<T> persistentClass) {
        this.persistentClass = persistentClass;
    }
    
    public Class<T> getPersistentClass() {
        return persistentClass;
    }

    @SuppressWarnings("unchecked")
	public T findById(ID id, boolean lock) {
        T entity;
        if (lock)
        	entity = (T) getHibernateTemplate().get(getPersistentClass(), id, LockMode.UPGRADE);
        else
            entity = (T) getHibernateTemplate().get(getPersistentClass(), id);
        return entity;
    }

    @SuppressWarnings("unchecked")
    public List<T> findAll() {
    	DetachedCriteria crit = DetachedCriteria.forClass(persistentClass);
    	return getHibernateTemplate().findByCriteria(crit);
	}
    
    @SuppressWarnings("unchecked")
	public List<T> findAllInQuantities(int firstResult, int maxResults) {
    	DetachedCriteria crit = DetachedCriteria.forClass(persistentClass);
		return getHibernateTemplate().findByCriteria(crit, firstResult, maxResults);
	}

    @SuppressWarnings("unchecked")
    public List<T> findByExample(T exampleInstance, String... excludeProperty) {
        return findByExampleInQuantities(-1, -1, exampleInstance, excludeProperty);
    }
    
    @SuppressWarnings("unchecked")
	public List<T> findByExampleInQuantities(int firstResult, int maxResults,
			T exampleInstance, String... excludeProperty) {
		Example example = Example.create(exampleInstance);
		for (String exclude : excludeProperty) {
			example.excludeProperty(exclude);
		}
		example.enableLike(MatchMode.ANYWHERE);
		example.excludeZeroes();
		DetachedCriteria crit = DetachedCriteria.forClass(persistentClass).add(example);
		//crit.add(example);
		List<T> results = getHibernateTemplate().findByCriteria(crit, firstResult, maxResults);
		return results;
	}
    
    protected List findByExample(int firstIndex, int maxResults,
			Object exampleInstance, String... excludeProperty) {
		Example example = Example.create(exampleInstance);
		for (String exclude : excludeProperty) {
			example.excludeProperty(exclude);
		}
		example.enableLike(MatchMode.ANYWHERE);
		example.excludeZeroes();
		DetachedCriteria crit = DetachedCriteria.forClass(
				exampleInstance.getClass()).add(example);
		//crit.add(example);
		List results = getHibernateTemplate().findByCriteria(crit, firstIndex,
				maxResults);
		return results;
	}

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

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