EntityHandler for Green Dao

EntityHandlerGreenDAO

package com.lucentia.ahorrarelec.data;
import java.util.List;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;

import de.greenrobot.dao.AbstractDao;
import de.greenrobot.dao.Property;
import de.greenrobot.dao.query.WhereCondition;

public abstract class DataHandlerBase<T> {

	private SQLiteDatabase db;
	private DaoMaster mDaoMaster;
	private DaoSession mDaoSession;
	private AbstractDao<T, Long> mAbstractDao;

	@SuppressWarnings("unchecked")
	public DataHandlerBase(Context c, T entity) {
		// Create Schema
		DevOpenHelper helper = new DaoMaster.DevOpenHelper(c, "elec-db-v1",
				null);
		try {
			db = helper.getWritableDatabase();
		} catch (Exception e) {
			e.printStackTrace();
		}
		mDaoMaster = new DaoMaster(db);
		mDaoSession = mDaoMaster.newSession();
		//Create Dao of the T Object
		mAbstractDao= (AbstractDao<T, Long>) mDaoSession.getDao(entity.getClass());
	}
	
	//BD operations
	//Insert
	/** Return ID inserted*/
	public long insertItem(T entity){
		return mAbstractDao.insert(entity);
	}
	
	//Update
	public void updateItem(T entity){
		 mAbstractDao.update(entity);
	}
	
	//Delete
	public void deleteItem(T entity){
		mAbstractDao.delete(entity);
	}
	
	//Refresh
	public void refreshItem(T entity){
		mAbstractDao.refresh(entity);
	}
	
	//Select one
	public T getItem(Long id){
		//Prevent to get a value from cache
		mAbstractDao.refresh(mAbstractDao.load(id));
		return mAbstractDao.load(id);
	}
	
	//Get All
	public List<T> getAllItems(T entity){
		mDaoSession.clear();
		return mAbstractDao.loadAll();
	}
	
	//Parameterized Query
	public List<T> getItems(WhereCondition condition,Property orderby){
		 return mAbstractDao.queryBuilder()
				 	.where(condition)
					.orderDesc(orderby)
					.list();
	}

}

ItemHandlerImpl.java

public class ItemHandlerImpl extends DataHandlerBase<Item> {
	
	
	private static ItemHandlerImpl mItemHandler;
	public ElectHandlerImpl(Context c, Electrodomesticos entity) {
		super(c, entity);		
	}
	public static ItemHandlerImpl getInstance(Context c){
		if(mItemHandler ==null){
			mItemHandler = new ItemHandlerImpl(c,new Item());
		}
		return mItemHandler;
	}

}