devextreme/data/store_helper.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (data/store_helper.js)
 * Version: 18.1.3
 * Build date: Tue May 15 2018
 *
 * Copyright (c) 2012 - 2018 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */

"use strict";
var grep = require("../core/utils/common").grep,
    extend = require("../core/utils/extend").extend,
    each = require("../core/utils/iterator").each,
    arrayQuery = require("./array_query"),
    normalizeSortingInfo = require("./utils").normalizeSortingInfo;

function multiLevelGroup(query, groupInfo) {
    query = query.groupBy(groupInfo[0].selector);
    if (groupInfo.length > 1) {
        query = query.select(function(g) {
            return extend({}, g, {
                items: multiLevelGroup(arrayQuery(g.items), groupInfo.slice(1)).toArray()
            })
        })
    }
    return query
}

function arrangeSortingInfo(groupInfo, sortInfo) {
    var filteredGroup = [];
    each(groupInfo, function(_, group) {
        var collision = grep(sortInfo, function(sort) {
            return group.selector === sort.selector
        });
        if (collision.length < 1) {
            filteredGroup.push(group)
        }
    });
    return filteredGroup.concat(sortInfo)
}

function queryByOptions(query, options, isCountQuery) {
    options = options || {};
    var filter = options.filter,
        sort = options.sort,
        select = options.select,
        group = options.group,
        skip = options.skip,
        take = options.take;
    if (filter) {
        query = query.filter(filter)
    }
    if (group) {
        group = normalizeSortingInfo(group)
    }
    if (!isCountQuery) {
        if (sort || group) {
            sort = normalizeSortingInfo(sort || []);
            if (group) {
                sort = arrangeSortingInfo(group, sort)
            }
            each(sort, function(index) {
                query = query[index ? "thenBy" : "sortBy"](this.selector, this.desc, this.compare)
            })
        }
        if (select) {
            query = query.select(select)
        }
    }
    if (group) {
        query = multiLevelGroup(query, group)
    }
    if (!isCountQuery) {
        if (take || skip) {
            query = query.slice(skip || 0, take)
        }
    }
    return query
}
module.exports = {
    multiLevelGroup: multiLevelGroup,
    arrangeSortingInfo: arrangeSortingInfo,
    queryByOptions: queryByOptions
};