@openui5/sap.ui.core
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OpenUI5 Core Library sap.ui.core
148 lines (136 loc) • 5.42 kB
JavaScript
/*!
* OpenUI5
* (c) Copyright 2009-2021 SAP SE or an SAP affiliate company.
* Licensed under the Apache License, Version 2.0 - see LICENSE.txt.
*/
// Provides the concept of a sorter for list bindings
sap.ui.define(['sap/ui/base/Object', "sap/base/Log"],
function(BaseObject, Log) {
"use strict";
/**
*
* Constructor for Sorter.
*
* @class
* Sorter for list bindings.
*
* Instances of this class define the sort order for a list binding.
*
*
* @param {string} sPath the binding path used for sorting
* @param {boolean} [bDescending=false] whether the sort order should be descending
* @param {boolean|function} [vGroup] configure grouping of the content, can either be true to enable grouping
* based on the raw model property value, or a function which calculates the group value out of the
* context (e.g. oContext.getProperty("date").getYear() for year grouping). The control needs to
* implement the grouping behaviour for the aggregation which you want to group. In case a function
* is provided it must either return a primitive type value as the group key or an object containing
* a "key" property and additional properties needed for group visualization.
* <b>Note:</b> Grouping is only possible (and only makes sense) for the primary sort property.
* @param {function} [fnComparator] A custom comparator function, which is used for client-side sorting instead
* of the default comparator method. Information about parameters and expected return values of such a
* method can be found in the {@link #.defaultComparator default comparator} documentation.
* <b>Note:</b> Custom comparator functions are meant to be used on the client. Models that implement
* sorting in the backend usually don't support custom comparator functions. Consult the documentation
* of the specific model implementation.
* @public
* @alias sap.ui.model.Sorter
* @extends sap.ui.base.Object
*/
var Sorter = BaseObject.extend("sap.ui.model.Sorter", /** @lends sap.ui.model.Sorter.prototype */ {
constructor : function(sPath, bDescending, vGroup, fnComparator){
if (typeof sPath === "object") {
var oSorterData = sPath;
sPath = oSorterData.path;
bDescending = oSorterData.descending;
vGroup = oSorterData.group;
fnComparator = oSorterData.comparator;
}
this.sPath = sPath;
// if a model separator is found in the path, extract model name
var iSeparatorPos = this.sPath.indexOf(">");
if (iSeparatorPos > 0) {
// Model names are ignored, this must be kept for compatibility reasons. But using model names in the
// sorter path make no technical sense as the binding cannot access any other models.
Log.error("Model names are not allowed in sorter-paths: \"" + this.sPath + "\"");
this.sPath = this.sPath.substr(iSeparatorPos + 1);
}
this.bDescending = bDescending;
this.vGroup = vGroup;
if (typeof vGroup == "boolean" && vGroup) {
this.fnGroup = function(oContext) {
return oContext.getProperty(this.sPath);
};
}
if (typeof vGroup == "function") {
this.fnGroup = vGroup;
}
this.fnCompare = fnComparator;
},
/**
* Returns a group object, at least containing a key property for group detection.
* May contain additional properties as provided by a custom group function.
*
* @param {sap.ui.model.Context} oContext the binding context
* @return {object} An object containing a key property and optional custom properties
* @public
*/
getGroup : function(oContext) {
var oGroup = this.fnGroup(oContext);
if (typeof oGroup === "string" || typeof oGroup === "number" || typeof oGroup === "boolean" || oGroup == null) {
oGroup = {
key: oGroup
};
}
return oGroup;
},
/**
* Returns the group function of this Sorter. If grouping is not enabled on this Sorter, it will return
* undefined, if no explicit group function has been defined the default group function is returned.
* The returned function is bound to its Sorter, so it will group according to its own property path,
* even if it is used in the context of another Sorter.
*
* @return {function} The group function
* @public
*/
getGroupFunction : function() {
return this.fnGroup && this.fnGroup.bind(this);
}
});
/**
* Compares two values
*
* This is the default comparator function used for clientside sorting, if no custom comparator is given in the
* constructor. It does compare just by using equal/less than/greater than with automatic type casting, except
* for null values, which are last in ascending order, and string values where localeCompare is used.
*
* The comparator method returns -1, 0 or 1, depending on the order of the two items and is
* suitable to be used as a comparator method for Array.sort.
*
* @param {any} a the first value to compare
* @param {any} b the second value to compare
* @returns {int} -1, 0 or 1 depending on the compare result
* @public
*/
Sorter.defaultComparator = function(a, b) {
if (a == b) {
return 0;
}
if (b == null) {
return -1;
}
if (a == null) {
return 1;
}
if (typeof a == "string" && typeof b == "string") {
return a.localeCompare(b);
}
if (a < b) {
return -1;
}
if (a > b) {
return 1;
}
return 0;
};
return Sorter;
});