com.gcrm.dao.BaseDao.java Source code

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Here is the source code for com.gcrm.dao.BaseDao.java

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/**
 * Copyright (C) 2012, Grass CRM Inc
 *
 * 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 com.gcrm.dao;

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

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.gcrm.exception.DaoException;
import com.gcrm.vo.SearchCondition;
import com.gcrm.vo.SearchResult;

/**
 * Base Dao
 */
public class BaseDao<T extends Serializable> extends HibernateDaoSupport implements IBaseDao<T> {

    private static String INIT_HQL = "from ";

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#getAllObjects(java.lang.String)
     */
    @SuppressWarnings("unchecked")
    public List<T> getAllObjects(String clazz) {

        String hql = INIT_HQL + clazz;
        List<T> objects = null;

        objects = getHibernateTemplate().find(hql);

        return objects;
    }

    /**
     * Finds records by hql with parameters
     * 
     * @param hql hql with parameters
     * @param paramValue parameter value
     * @return result list
     * @throws Exception
     */
    @SuppressWarnings("rawtypes")
    private List findByParam(String hql, Object paramValue) throws DaoException {

        List objects = null;

        try {
            objects = getHibernateTemplate().find(hql, paramValue);
        } catch (Exception e) {
            throw new DaoException("Failed to find records by hql with parameters!", e);
        }
        return objects;
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#findByName(java.lang.String, java.lang.String)
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public T findByName(String clazz, String name) throws DaoException {
        String hql = INIT_HQL + clazz + " where name = ?";
        T object = null;
        List result = null;

        try {
            result = findByParam(hql, name);
            if (result != null && result.size() > 0) {
                object = (T) result.get(0);
            }
        } catch (Exception e) {
            throw new DaoException("id!", e);
        }
        return object;
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#makePersistent(java.io.Serializable)
     */
    public void makePersistent(T entity) {
        getHibernateTemplate().merge(entity);
        getHibernateTemplate().flush();
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#deleteEntity(java.lang.Class, java.lang.Integer)
     */
    public void deleteEntity(Class<T> entityClass, Integer id) {
        T entity = (T) getHibernateTemplate().get(entityClass, id);
        getHibernateTemplate().delete(entity);
        getHibernateTemplate().flush();
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#getObjectsCount(java.lang.String)
     */
    public long getObjectsCount(String clazz) {
        String hql = "select count(*) from " + clazz;

        long count = 0;

        count = (Long) getHibernateTemplate().find(hql).get(0);

        return count;
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#getEntityById(java.lang.Class, java.lang.Integer)
     */
    public T getEntityById(Class<T> entityClass, Integer id) {
        T entity = null;
        entity = (T) getHibernateTemplate().load(entityClass, id);
        return entity;
    }

    /* (non-Javadoc)
     * @see com.gcrm.dao.IBaseDao#getPaginationObjects(java.lang.String, com.gcrm.vo.SearchCondition)
     */
    @SuppressWarnings("unchecked")
    public SearchResult<T> getPaginationObjects(final String clazz, final SearchCondition searchCondition) {

        List<T> objects = null;

        final String condition = searchCondition.getCondition();

        objects = getHibernateTemplate().executeFind(new HibernateCallback<List<T>>() {

            public List<T> doInHibernate(Session session) throws HibernateException, SQLException {
                String hql = INIT_HQL + clazz;
                if (condition != null && condition.length() > 0) {
                    hql += " where ";
                    hql += condition;
                }
                hql += " order by " + searchCondition.getSidx() + " "

                        + searchCondition.getSord();
                int pageSize = searchCondition.getPageSize();
                int pageNo = searchCondition.getPageNo();

                Query query = session.createQuery(hql);

                if (pageNo != 0 && pageSize != 0) {
                    int rowNumber = (pageNo - 1) * pageSize;
                    query.setFirstResult(rowNumber);
                    query.setMaxResults(pageSize);
                }
                List<T> list = query.list();

                return list;
            }
        });

        long count = 0;
        String countHql = "select count(*) from " + clazz;
        if (condition != null && condition.length() > 0) {
            countHql += " where ";
            countHql += condition;
        }

        count = (Long) getHibernateTemplate().find(countHql).get(0);
        SearchResult<T> result = new SearchResult<T>(count, objects);

        return result;
    }

}