@calf/angular/dist/lib/utilities/filter/filter.utility.js

Angular module of Calf framework.

import { Subject } from "rxjs";
// Data
import { FilterItem } from "./filter-item.class";
/** Filter utility */
export class Filter {
    constructor() {
        // Filter items
        this.items = {};
        // On filter change
        this.changeSource = new Subject();
        this.$change = this.changeSource.asObservable();
        // On params
        this.paramsSource = new Subject();
        this.$params = this.paramsSource.asObservable();
    }
    /**
     * Register filter
     * @param name
     * @param type
     * @param value
     * @param service
     */
    register(name, type, value, service) {
        this.items[name] = new FilterItem(type, value, service);
    }
    /**
     * Remove filter
     * @param name
     */
    remove(name) {
        delete this.items[name];
    }
    /**
     * Check if filter is set
     * @param name
     */
    isSet(name) {
        return name in this.items && this.items[name].isSet();
    }
    /**
     * Check if filter is registered
     * @param name
     */
    isRegistered(name) {
        return name in this.items;
    }
    /**
     * Get filter value
     * @param name
     */
    get(name) {
        // Check if filter exists
        if (!this.isRegistered(name)) {
            throw new Error(`Filter '${name}' not registered. Did you forget to call 'register(${name})?'`);
        }
        // Get value
        return this.items[name].value;
    }
    /**
     * Set value
     * @param name
     * @param value
     * @param omit
     */
    set(name, value, omit = false) {
        // Check if filter exists
        if (!this.isRegistered(name)) {
            throw new Error(`Filter '${name}' not registered. Did you forget to call 'register(${name})?'`);
        }
        // Set value
        this.items[name].value = value;
        // Check whether to omit change
        if (omit) {
            return;
        }
        // Call on change hook
        this.onChange();
    }
    /**
     * Params
     * @param params
     */
    params(params) {
        // Iterate filters
        for (let name in this.items) {
            // Check if name is in params
            if (!params.has(name)) {
                continue;
            }
            // Set filter value
            this.items[name].fromParam(params.getAll(name));
        }
        // Emit params
        this.paramsSource.next();
    }
    /** On change */
    onChange() {
        // Init extras
        let extras = { queryParams: {} };
        // Iterate filters
        for (let name in this.items) {
            // Check if item is set
            if (this.items[name].isSet()) {
                // Add to extras
                extras.queryParams[name] = this.items[name].toParam();
            }
        }
        // Emit change
        this.changeSource.next(extras);
    }
}