com.facade.AbstractFacade.java Source code

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Here is the source code for com.facade.AbstractFacade.java

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package com.facade;

import com.utils.MyUtils;
import java.io.Serializable;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Projections;

public abstract class AbstractFacade<T> implements Serializable {

    public final Class<T> entityClass;

    public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

    public void createTransactionSession(Transaction trans, Session session) throws HibernateException {

    }

    public T create(T entity) throws Exception {
        Transaction trans = null;
        Session session = null;
        try {
            session = MyUtils.getSession();
            trans = session.beginTransaction();

            if (entity == null) {
                throw new NullPointerException();
            }

            session.save(entity);
            trans.commit();
        } catch (HibernateException e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
            throw new Exception(e);
        } finally {
            MyUtils.closeSession(session);
        }
        return entity;
    }

    public void edit(T entity) throws Exception {
        Transaction trans = null;
        Session session = null;
        try {
            session = MyUtils.getSession();
            trans = session.beginTransaction();

            session.update(entity);

            trans.commit();
        } catch (Exception e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
            throw new Exception(e);
        } finally {
            MyUtils.closeSession(session);
        }
    }

    public void remove(T entity) throws Exception {
        Transaction trans = null;
        Session session = null;
        try {
            session = MyUtils.getSession();
            trans = session.beginTransaction();

            session.delete(entity);
            trans.commit();
        } catch (Exception e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
            throw new Exception(e);
        } finally {
            MyUtils.closeSession(session);
        }
    }

    public T find(Object id) throws Exception {
        Transaction trans = null;
        Session session = null;
        try {
            session = MyUtils.getSession();
            trans = session.beginTransaction();

            T obj = (T) session.get(entityClass, (Serializable) id);
            trans.commit();
            return obj;
        } catch (Exception e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
            throw new Exception(e);
        } finally {
            MyUtils.closeSession(session);
        }
    }

    public List<T> findAll() {
        Transaction trans = null;
        Session session = null;
        List<T> list = null;
        try {
            session = MyUtils.getSession();
            if (session != null) {
                trans = session.beginTransaction();

                list = session.createCriteria(entityClass).list();

                trans.commit();
            }
        } catch (Exception e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
        } finally {
            MyUtils.closeSession(session);
        }
        return list;
    }

    public int count() {
        Transaction trans = null;
        Session session = null;
        int cnt = 0;
        try {
            session = MyUtils.getSession();
            trans = session.beginTransaction();

            Criteria cq = session.createCriteria(entityClass);
            cq.setProjection(Projections.rowCount());
            cnt = ((Long) cq.uniqueResult()).intValue();

            trans.commit();
        } catch (Exception e) {
            try {
                if (trans != null && trans.isActive()) {
                    trans.rollback();
                }
            } catch (Exception ex) {
                throw ex;
            }
            Logger.getLogger(entityClass.getName()).log(Level.SEVERE, null, e);
        } finally {
            MyUtils.closeSession(session);
        }
        return cnt;
    }

}