ca.travelagency.persistence.DaoSupportImpl.java Source code

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Here is the source code for ca.travelagency.persistence.DaoSupportImpl.java

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/**
 *    Copyright (C) 2010 - 2014 VREM Software Development <VREMSoftwareDevelopment@gmail.com>
 *
 *    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 ca.travelagency.persistence;

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

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.apache.commons.lang3.Validate;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import ca.travelagency.persistence.query.Condition;
import ca.travelagency.persistence.query.Condition.Operator;
import ca.travelagency.persistence.query.Criteria;
import ca.travelagency.persistence.query.QuerySQL;
import ca.travelagency.utils.StringUtils;

@Repository
public class DaoSupportImpl<T extends DaoEntity> implements DaoSupport<T> {

    @PersistenceContext
    private EntityManager entityManager;

    @Transactional
    @Override
    public void persist(T daoEntity) {
        Validate.notNull(daoEntity);
        entityManager.persist(daoEntity);
    }

    @Transactional
    @Override
    public void merge(T daoEntity) {
        Validate.notNull(daoEntity);
        entityManager.merge(daoEntity);
    }

    @Transactional
    @Override
    public void remove(T daoEntity) {
        Validate.notNull(daoEntity);
        Object reference = entityManager.getReference(daoEntity.getTrueClass(), daoEntity.getId());
        entityManager.remove(reference);
    }

    @SuppressWarnings("unchecked")
    @Override
    public T find(Class<?> type, Long id) {
        Validate.notNull(type);
        Validate.notNull(id);
        return (T) entityManager.find(type, id);
    }

    @Override
    public Long count(DaoCriteria daoCriteria) {
        Query query = QuerySQL.count(daoCriteria.getCriteria(), entityManager).makeQuery();
        Number count = (Number) query.getSingleResult();
        return count.longValue();
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<T> find(DaoCriteria daoCriteria) {
        Query query = QuerySQL.find(daoCriteria.getCriteria(), entityManager).makeQuery();
        return (List<T>) query.getResultList();
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<String> groupBy(DaoCriteria daoCriteria) {
        Query query = QuerySQL.groupBy(daoCriteria.getCriteria(), entityManager).makeQuery();
        return (List<String>) query.getResultList();
    }

    @Override
    public boolean duplicated(T daoEntity) {
        Criteria criteria = Criteria.make(daoEntity.getTrueClass());
        String name = daoEntity.getName();
        if (StringUtils.isNotEmpty(name)) {
            criteria.addAndCondition(Condition.make(DaoEntity.PROPERTY_NAME, Operator.EQUAL, name));
        }
        Serializable id = daoEntity.getId();
        if (id != null) {
            criteria.addAndCondition(Condition.make(DaoEntity.PROPERTY_ID, Operator.NOTEQUAL, id));
        }
        List<T> results = find(criteria);
        return !results.isEmpty();
    }

    @Override
    public List<T> find(Class<?> clazz) {
        return find(Criteria.make(clazz));
    }

    @Override
    public EntityManager getEntityManager() {
        return entityManager;
    }

}