/**
* Copyright (c) 2005-2011, Rory Ye
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the Jdkcn.com nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jdkcn.myblog.service.impl;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import org.apache.commons.lang.StringUtils;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.persist.Transactional;
import com.jdkcn.myblog.domain.Category;
import com.jdkcn.myblog.domain.Category.Type;
import com.jdkcn.myblog.exception.DuplicateException;
import com.jdkcn.myblog.service.CategoryService;
/**
* @author <a href="mailto:rory.cn@gmail.com">Rory, Ye</a>
* @since May 10, 2010 11:03:56 AM
* @version $Id: CategoryServiceImpl.java 427 2011-05-13 09:28:19Z rory.cn $
*/
public class CategoryServiceImpl implements CategoryService {
@Inject
private Provider<EntityManager> entityManagerProvider;
/**
* {@inheritDoc}
*
*/
@SuppressWarnings("unchecked")
public List<Category> getRoots(Type type) {
Query query = null;
if (type != null) {
query = entityManagerProvider.get().createQuery("from Category where type = :type and parent is null");
query.setParameter("type", type);
} else {
query = entityManagerProvider.get().createQuery("from Category where parent is null");
}
return query.getResultList();
}
/**
* {@inheritDoc}
*/
public Category getByName(String name, String parentId) {
Query query = null;
if (StringUtils.isBlank(parentId)) {
query = entityManagerProvider.get().createQuery("from Category where name = :name and parent is null");
} else {
query = entityManagerProvider.get().createQuery("from Category where name = :name and parent.id = :parentId");
query.setParameter("parentId", parentId);
}
query.setParameter("name", name);
@SuppressWarnings("unchecked")
List<Category> categories = query.getResultList();
if (categories.isEmpty()) {
return null;
}
return categories.get(0);
}
/**
* {@inheritDoc}
*
*/
@Transactional
public Category saveOrUpdate(Category category) {
String parentId = null;
if (category.getParent() != null) {
parentId = category.getParent().getId();
}
if (StringUtils.isBlank(category.getId())) {
if (category.getOrder() == null) {
category.setOrder(getMaxOrder(parentId) + 1);
}
category.setCount(0);
}
Category exist = getByName(category.getName(), parentId);
if (exist != null && !StringUtils.equals(category.getId(), exist.getId())) {
throw new DuplicateException("category in parentId[" + parentId + "] duplicate with name:" + category.getName());
}
Category savedCategory = entityManagerProvider.get().merge(category);
if (category.getParent() != null) {
category.getParent().getChildren().add(savedCategory);
}
return savedCategory;
}
/**
* {@inheritDoc}
*/
public Category get(String id) {
return entityManagerProvider.get().find(Category.class, id);
}
/**
* {@inheritDoc}
*/
public Integer getMaxOrder(String parentId) {
Integer order = null;
Query query = null;
if (StringUtils.isNotBlank(parentId)) {
query = entityManagerProvider.get().createQuery("select max(cate.order) from Category cate where cate.parent.id = :parentId");
query.setParameter("parentId", parentId);
} else {
query = entityManagerProvider.get().createQuery("select max(cate.order) from Category cate where cate.parent is null");
}
order = (Integer) query.getSingleResult();
return order == null ? 0 : order;
}
}