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const _ = require("lodash");
/**
* Class to implement sort handling for OData library client.
*
* @class Sorter
*/
class Sorter {
/**
* Creates an instance of Sorter.
* @param {Object} entityType information about EntityType parsed from Metadata
* @param {string} parts parts of the orderby clause
* @memberof Sorter
*/
constructor(entityType, parts) {
Object.defineProperty(this, "parts", {
value: parts,
writable: false,
});
this.validate(entityType, parts);
}
/**
* Validates the input
*
* Checks if all properties are Sortable
*
* @param {Object} entityType information about EntityType parsed from Metadata
* @param {string} parts parts of the orderby clause
*/
validate(entityType, parts) {
_.chain(parts)
.reduce((properties, part) => properties.concat(part.split(" ")), [])
// Filter out asc/desc keywords
.filter((property) => property !== "asc" && property !== "desc")
// Filter out nested properties (eg. $orderby=Rating,Category/Name)
.filter((property) => property.indexOf("/") === -1)
.forEach((property) => {
let metaProp = entityType.getProperty(property);
if (!metaProp.sap.sortable) {
throw new Error(
`Property ${property} cannot be used in orderby clause as it is not sortable`
);
}
})
.value();
}
/**
* Convert sorter to the URI Component
*
* @returns {String} string which contains sorter with encoded characters
*/
toURIComponent() {
return encodeURIComponent(_.chain(this.parts).join(",").value());
}
}
module.exports = Sorter;
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