/*******************************************************************************
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* Copyright (c) 2005, 2014 springside.github.io
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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*******************************************************************************/
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package com.northglass.service.task;
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import java.util.List;
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import java.util.Map;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.PageRequest;
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import org.springframework.data.domain.Sort;
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import org.springframework.data.domain.Sort.Direction;
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import org.springframework.data.jpa.domain.Specification;
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import org.springframework.stereotype.Component;
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import org.springframework.transaction.annotation.Transactional;
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import com.northglass.entity.Task;
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import com.northglass.repository.TaskDao;
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import org.springside.modules.persistence.DynamicSpecifications;
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import org.springside.modules.persistence.SearchFilter;
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import org.springside.modules.persistence.SearchFilter.Operator;
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// Spring Bean的标识.
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@Component
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// 类中所有public函数都纳入事务管理的标识.
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@Transactional
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public class TaskService {
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private TaskDao taskDao;
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public Task getTask(Long id) {
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return taskDao.findOne(id);
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}
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public void saveTask(Task entity) {
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taskDao.save(entity);
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}
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public void deleteTask(Long id) {
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taskDao.delete(id);
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}
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public List<Task> getAllTask() {
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return (List<Task>) taskDao.findAll();
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}
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public Page<Task> getUserTask(Long userId, Map<String, Object> searchParams, int pageNumber, int pageSize,
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String sortType) {
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PageRequest pageRequest = buildPageRequest(pageNumber, pageSize, sortType);
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Specification<Task> spec = buildSpecification(userId, searchParams);
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return taskDao.findAll(spec, pageRequest);
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}
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/**
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* 创建分页请求.
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*/
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private PageRequest buildPageRequest(int pageNumber, int pagzSize, String sortType) {
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Sort sort = null;
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if ("auto".equals(sortType)) {
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sort = new Sort(Direction.DESC, "id");
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} else if ("title".equals(sortType)) {
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sort = new Sort(Direction.ASC, "title");
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}
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return new PageRequest(pageNumber - 1, pagzSize, sort);
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}
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/**
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* 创建动态查询条件组合.
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*/
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private Specification<Task> buildSpecification(Long userId, Map<String, Object> searchParams) {
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Map<String, SearchFilter> filters = SearchFilter.parse(searchParams);
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filters.put("user.id", new SearchFilter("user.id", Operator.EQ, userId));
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Specification<Task> spec = DynamicSpecifications.bySearchFilter(filters.values(), Task.class);
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return spec;
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}
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@Autowired
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public void setTaskDao(TaskDao taskDao) {
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this.taskDao = taskDao;
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}
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}
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