/**
* 设置ProductCategory的treepath和grade属性。例如根级分类的treepath为',',grade为‘0’表示顶级分类，
* 次级分类的treepath为‘,1,’，其中这个1表示根级分类中第一个元素，grade为'1'表示一级分类，以此类推。
*
* @param paramProductCategory 某个等级的实例
* @return
*/
private void setProductCategoryOfTreepathAndGrade(ProductCategory paramProductCategory) {
if (paramProductCategory == null) return;
ProductCategory localProductCategory = paramProductCategory.getParent();
if (localProductCategory != null)
paramProductCategory.setTreePath(
localProductCategory.getTreePath() + localProductCategory.getId() + ",");
else paramProductCategory.setTreePath(",");
paramProductCategory.setGrade(Integer.valueOf(paramProductCategory.getTreePaths().size()));
}
@Override
public List<ProductCategory> findParents(ProductCategory productCategory, Integer count) {
if ((productCategory == null) || (productCategory.getParent() == null))
return Collections.emptyList();
String str =
"select productCategory from ProductCategory productCategory where productCategory.id in (:ids) order by productCategory.grade asc";
TypedQuery<ProductCategory> localTypedQuery =
this.getEntityManager()
.createQuery(str, ProductCategory.class)
.setFlushMode(FlushModeType.COMMIT)
.setParameter("ids", productCategory.getTreePaths());
if (count != null) localTypedQuery.setMaxResults(count.intValue());
return localTypedQuery.getResultList();
}
/**
* 完成子级分类的封装，把ProductCategory的孩子都逐级封装成list，例如传入list为所有等级id，
* ProductCategory为某个根等级，则把该根等级下的所有子等级依次封装成树形结构的list，并返回该list
*
* @param paramList 所有等待封装的ProductCategory的list
* @param paramProductCategory 某个等级的实例
* @return 该等级下的所有子等级list
*/
private List<ProductCategory> packTheChildren(
List<ProductCategory> paramList, ProductCategory paramProductCategory) {
ArrayList<ProductCategory> localArrayList = new ArrayList<ProductCategory>();
if (paramList != null) {
Iterator<ProductCategory> localIterator = paramList.iterator();
while (localIterator.hasNext()) {
ProductCategory localProductCategory = (ProductCategory) localIterator.next();
if (localProductCategory.getParent() != paramProductCategory) continue;
localArrayList.add(localProductCategory);
localArrayList.addAll(packTheChildren(paramList, localProductCategory));
}
}
return localArrayList;
}