cn.aozhi.songify.service.music.MusicService.java Source code

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Here is the source code for cn.aozhi.songify.service.music.MusicService.java

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/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/
package cn.aozhi.songify.service.music;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springside.modules.persistence.DynamicSpecifications;
import org.springside.modules.persistence.SearchFilter;
import org.springside.modules.persistence.SearchFilter.Operator;

import cn.aozhi.songify.entity.Music;
import cn.aozhi.songify.repository.MusicDao;

// Spring Bean.
@Component
// public?.
@Transactional
public class MusicService {

    private MusicDao musicDao;

    public Music getMusic(Long id) {
        return musicDao.findOne(id);
    }

    public void saveMusic(Music entity) {
        musicDao.save(entity);
    }

    public void deleteMusic(Long id) {
        musicDao.delete(id);
    }

    public List<Music> getAllMusic() {
        return (List<Music>) musicDao.findAll();
    }

    public Page<Music> getUserMusic(Map<String, Object> searchParams, int pageNumber, int pageSize,
            String sortType) {
        PageRequest pageRequest = buildPageRequest(pageNumber, pageSize, sortType);
        Specification<Music> spec = buildSpecification(searchParams);

        return musicDao.findAll(spec, pageRequest);
    }

    /**
     * .
     */
    private PageRequest buildPageRequest(int pageNumber, int pagzSize, String sortType) {
        Sort sort = null;
        if ("auto".equals(sortType)) {
            sort = new Sort(Direction.DESC, "id");
        } else if ("title".equals(sortType)) {
            sort = new Sort(Direction.ASC, "music_name");
        }

        return new PageRequest(pageNumber - 1, pagzSize, sort);
    }

    /**
     * ???.
     */
    private Specification<Music> buildSpecification(Map<String, Object> searchParams) {
        Map<String, SearchFilter> filters = SearchFilter.parse(searchParams);
        Specification<Music> spec = DynamicSpecifications.bySearchFilter(filters.values(), Music.class);
        return spec;
    }

    @Autowired
    public void setMusicDao(MusicDao MusicDao) {
        this.musicDao = MusicDao;
    }
}