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Spring Dao Libray for easy using JPA
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package springdao;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * Do everything that {@link DaoRepository } do, it's main purpose is
 * transaction management.

 * Standard JPA does not support custom isolation levels, So we must declare
 * {@link Transactional @Transactional} here.

 * 封裝{@link DaoRepository}的功能，只是為了交易控制.
 *
 * @author Kent Yeh
 * @param 
 */
@Transactional(readOnly = true)
public class RepositoryManager {

    private DaoRepository dao;
    protected static Logger logger = LogManager.getLogger(RepositoryManager.class);

    public DaoRepository getDao() {
        return dao;
    }

    public void setDao(DaoRepository dao) {
        this.dao = dao;
    }

    public E instanate() throws InstantiationException, IllegalAccessException {
        return dao.instanate();
    }

    public E findByPrimaryKey(Serializable primaryKey) {
        return dao == null ? null : dao.findByPrimaryKey(primaryKey);
    }

    public E findByPrimaryKey(Serializable primaryKey, String lockMode) {
        return dao == null ? null : dao.findByPrimaryKey(primaryKey, lockMode);
    }

    public E findByPrimaryKey(Serializable primaryKey, Map properties) {
        return dao == null ? null : dao.findByPrimaryKey(primaryKey, properties);
    }

    /**
     * @param properties Not used.不使用
     */
    public E findByPrimaryKey(Serializable primaryKey, String lockMode, Map properties) {
        return dao == null ? null : dao.findByPrimaryKey(primaryKey, lockMode, properties);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E save(E entity) {
        return dao == null ? null : dao.save(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public Collection save(Collection entities) {
        return dao == null ? null : dao.save(entities);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E persist(E entity) {
        return dao == null ? null : dao.persist(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E update(E entity) {
        return dao == null ? null : dao.update(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public Collection update(Collection entities) {
        return dao == null ? null : dao.update(entities);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E merge(E entity) {
        return dao == null ? null : dao.merge(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public Collection merge(Collection entity) {
        return dao == null ? null : dao.merge(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E saveOrUpdate(E entity) {
        return dao == null ? null : dao.saveOrUpdate(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public Collection saveOrUpdate(Collection entities) {
        return dao == null ? null : dao.saveOrUpdate(entities);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public void delete(Serializable primaryKey) {
        dao.delete(primaryKey);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public void delete(Serializable primaryKey, String lockMode) {
        dao.delete(primaryKey, lockMode);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public void delete(Collection primaryKeys) {
        dao.delete(primaryKeys);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E remove(E entity) {
        return dao.remove(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E remove(E entity, String lockMode) {
        return dao.remove(entity, lockMode);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public Collection remove(Collection entities) {
        return dao.remove(entities);
    }

    public E refresh(E entity) {
        return dao == null ? null : dao.refresh(entity);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public E refresh(E entity, String lockMode) {
        return dao == null ? null : dao.refresh(entity, lockMode);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int sqlUpdate(String sql) {
        return dao == null ? null : dao.sqlUpdate(sql);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int sqlUpdate(String sql, Object... parameters) {
        return dao == null ? null : dao.sqlUpdate(sql, parameters);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int sqlUpdate(String sql, Mapparameters) {
        return dao == null ? null : dao.sqlUpdate(sql, parameters);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public List sqlUpdate(List sqls) {
        return dao == null ? null : dao.sqlUpdate(sqls);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int bulkUpdate(String QL) {
        return dao == null ? null : dao.bulkUpdate(QL);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public List bulkUpdate(List QLs) {
        return dao == null ? null : dao.bulkUpdate(QLs);
    }

    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int bulkUpdate(String QL, Object... parameters) {
        return dao == null ? null : dao.bulkUpdate(QL, parameters);
    }
    
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    public int bulkUpdate(String QL, Map parameters) {
        return dao == null ? null : dao.bulkUpdate(QL, parameters);
    }

    public String getEntityName() {
        return dao == null ? "" : dao.getEntityName();
    }

    public String $e() {
        return getEntityName();
    }

    public String getAliasName() {
        return dao == null ? "" : dao.getAliasName();
    }

    public String $a() {
        return getAliasName();
    }

    public String $a(String field) {
        return getAliasName() + "." + field;
    }

    public String $ea() {
        return getEntityName() + " AS " + getAliasName();
    }

    public List findByCriteria(String qlCriteria) {
        return dao == null ? null : dao.findByCriteria(qlCriteria);
    }

    public List findByCriteria(String qlCriteria, Object... parameters) {
        return dao == null ? null : dao.findByCriteria(qlCriteria, parameters);
    }

    public List findByCriteria(String qlCriteria, Map parameters) {
        return dao == null ? null : dao.findByCriteria(qlCriteria, parameters);
    }

    public List findByCriteria(String qlCriteria, int startPageNo, int pageSize, Object... parameters) {
        return dao == null ? null : dao.findByCriteria(qlCriteria, startPageNo, pageSize, parameters);
    }

    public List findByCriteria(String qlCriteria, int startPageNo, int pageSize, Map parameters) {
        return dao == null ? null : dao.findByCriteria(qlCriteria, startPageNo, pageSize, parameters);
    }

    public List findByCriteria(String qlCriteria, int startPageNo, int pageSize) {
        return dao == null ? null : dao.findByCriteria(qlCriteria, startPageNo, pageSize);
    }

    public E findFirstByCriteria(String qlCriteria) {
        List result = findByCriteria(qlCriteria, 1, 1);
        return result.isEmpty() ? null : result.get(0);
    }

    public E findFirstByCriteria(String qlCriteria, Object... parameters) {
        List result = findByCriteria(qlCriteria, 1, 1, parameters);
        return result.isEmpty() ? null : result.get(0);
    }

    public List findByNamedQuery(String name) {
        return dao == null ? null : dao.findByNamedQuery(name);
    }

    public List findByNamedQuery(String name, Object... parameters) {
        return dao == null ? null : dao.findByNamedQuery(name, parameters);
    }

    public List findByNamedQuery(String name, Map parameters) {
        return dao == null ? null : dao.findByNamedQuery(name, parameters);
    }

    public List findBySQLQuery(String sql) {
        return dao == null ? null : dao.findBySQLQuery(sql);
    }

    public List findBySQLQuery(String sql, Object... parameters) {
        return dao == null ? null : dao.findBySQLQuery(sql, parameters);
    }

    public List findBySQLQuery(String sql, Map parameters) {
        return dao == null ? null : dao.findBySQLQuery(sql, parameters);
    }

    public List findBySQLQuery(String sql, String entityAlias) {
        return dao == null ? null : dao.findBySQLQuery(sql, entityAlias);
    }

    public List findBySQLQuery(String sql, String entityAlias, Object... parameters) {
        return dao == null ? null : dao.findBySQLQuery(sql, entityAlias, parameters);
    }

    public  T findUniqueByQL(String QL) {
        if (dao == null) {
            return null;
        } else {
            return dao.findUniqueByQL(QL);
        }
    }

    public  T findUniqueByQL(Class clazz, String QL) {
        return findUniqueByQL(QL);
    }

    public  T findUniqueByQL(String QL, Object... parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findUniqueByQL(QL, parameters);
        }
    }

    public  T findUniqueByQL(Class clazz, String QL, Object... parameters) {
        return findUniqueByQL(QL, parameters);
    }

    public  T findUniqueByQL(String QL, Map parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findUniqueByQL(QL, parameters);
        }
    }

    public  T findUniqueByQL(Class clazz, String QL, Map parameters) {
        return findUniqueByQL(QL, parameters);
    }

    public  List findListByQL(String QL) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByQL(QL);
        }
    }

    public  List findListByQL(Class clazz, String QL) {
        return findListByQL(QL);
    }

    public  List findListByQL(String QL, Object... parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByQL(QL, parameters);
        }
    }

    public  List findListByQL(Class clazz, String QL, Object... parameters) {
        return findListByQL(QL, parameters);
    }

    public  List findListByQL(String QL, Map parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByQL(QL, parameters);
        }
    }

    public  List findListByQL(Class clazz, String QL, Map parameters) {
        return findListByQL(QL, parameters);
    }

    public  List findListByNamedQuery(String name) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByNamedQuery(name);
        }
    }

    public  List findListByNamedQuery(Class clazz, String name) {
        return findListByNamedQuery(name);
    }

    public  List findListByNamedQuery(String name, Object... parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByNamedQuery(name, parameters);
        }

    }

    public  List findListByNamedQuery(Class clazz, String name, Object... parameters) {
        return findListByNamedQuery(name, parameters);
    }

    public  List findListByNamedQuery(String name, Map parameters) {
        if (dao == null) {
            return null;
        } else {
            return dao.findListByNamedQuery(name, parameters);
        }

    }

    public  List findListByNamedQuery(Class clazz, String name, Map parameters) {
        return findListByNamedQuery(name, parameters);
    }

    public E initLazyCollection(E entity, String collectionFieldName) {
        return dao == null ? null : dao.initLazyCollection(entity, collectionFieldName);
    }

    public void clear() {
        if (dao != null) {
            dao.clear();
        }
    }
}