com.beto.test.securityinterceptor.model.dao.generic.AbstractDao.java Source code

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Here is the source code for com.beto.test.securityinterceptor.model.dao.generic.AbstractDao.java

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/*
 * Copyright 2014 912867.
 *
 * 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.beto.test.securityinterceptor.model.dao.generic;

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

import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaQuery;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

/**
 *
 * @author 912867
 * @param <T>
 */
@Repository
@Transactional
public abstract class AbstractDao<T> {
    private static final Logger LOGGER = Logger.getLogger(AbstractDao.class);
    private final Class<T> entityClass;

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

    public abstract EntityManager getEntityManager();

    public boolean save(T t) throws Exception {
        getEntityManager().persist(t);
        return true;
    }

    public T update(T t) throws Exception {
        return getEntityManager().merge(t);
    }

    public boolean delete(T t) throws Exception {
        getEntityManager().remove(getEntityManager().merge(t));
        return true;
    }

    public T find(Serializable id) {

        try {
            return getEntityManager().find(entityClass, id);
        } catch (NoResultException e) {
            LOGGER.debug("NO DATA FOUND...");
        }
        return null;

    }

    @SuppressWarnings("unchecked")
    public List<T> findAll() {

        try {
            CriteriaQuery<Object> cq = getEntityManager().getCriteriaBuilder().createQuery();
            cq.select(cq.from(entityClass));
            return (List<T>) getEntityManager().createQuery(cq).getResultList();
        } catch (NoResultException e) {
            LOGGER.debug("NO DATA FOUND...");
        }
        return null;
    }

    public List<T> getListWithNamedQuery(String query, String inParamName, List<?> inList) throws Exception {

        try {
            TypedQuery<T> tq = getEntityManager().createNamedQuery(query, entityClass);
            tq.setParameter(inParamName, inList);
            return tq.getResultList();
        } catch (NoResultException e) {
            LOGGER.debug("NO DATA FOUND...");
        }
        return null;
    }

    public List<T> getListWithNamedQuery(String query, Map<String, Object> inList) throws Exception {
        try {
            TypedQuery<T> tq = getEntityManager().createNamedQuery(query, entityClass);
            for (Map.Entry<String, Object> entrySet : inList.entrySet()) {
                String key = entrySet.getKey();
                Object value = entrySet.getValue();
                tq.setParameter(key, value);
            }
            return tq.getResultList();
        } catch (NoResultException e) {
            LOGGER.debug("NO DATA FOUND...");
        }
        return null;
    }

    public T getObWithNamedQuery(String query, String paramName, Object param) throws Exception {
        TypedQuery<T> tq = getEntityManager().createNamedQuery(query, entityClass);
        tq.setParameter(paramName, param);
        return tq.getSingleResult();
    }

    public List<T> selectNativeQueryToList(String Q) throws Exception {
        TypedQuery<T> tq = getEntityManager().createQuery(Q, entityClass);
        return tq.getResultList();
    }

}