@geogirafe/lib-geoportal/tools/state/statemanager.js

GeoGirafe is a flexible application to build online geoportals.

// SPDX-License-Identifier: Apache-2.0
/* eslint @typescript-eslint/no-explicit-any: 0 */
import GirafeSingleton from '../../base/GirafeSingleton.js';
import State from './state.js';
import { getPropertyByPath } from '../utils/pathUtils.js';
import Brain from './brain/brain.js';
class StateManager extends GirafeSingleton {
    girafeState = new State();
    stateProxy;
    get state() {
        return this.stateProxy.getState();
    }
    callbacks = {};
    constructor(context) {
        super(context);
        this.stateProxy = new Brain(this.girafeState, (path, oldValue, newValue, parents) => {
            this.onChange(path, oldValue, newValue, parents);
        });
    }
    initializeSingleton() {
        this.setDefaultValues();
    }
    setDefaultValues() {
        // Set default values
        const config = this.context.configManager.Config;
        if (this.state && config) {
            this.state.application.isConfigurationLoaded = true;
            this.state.projection = config.map.srid;
            this.state.language = config.languages.defaultLanguage;
            this.state.interface.selectionComponent = config.interface.defaultSelectionComponent;
        }
    }
    onChange(property, oldValue, value, parents) {
        const path = property.trim();
        for (const key in this.callbacks) {
            const regex = new RegExp('^' + key + '$');
            if (path.match(regex)) {
                const callbacks = this.callbacks[key];
                for (const callback of callbacks) {
                    callback(oldValue, value, parents.length === 1 ? parents[0] : parents);
                }
            }
        }
    }
    subscribe(path, callback) {
        const pathAsString = typeof path === 'string' ? path : path.source;
        if (!(pathAsString in this.callbacks)) {
            this.callbacks[pathAsString] = [];
        }
        this.callbacks[pathAsString].push(callback);
        console.debug(`Subscribing to ${path}. ${this.callbacks[pathAsString].length} are currently subscribing ${pathAsString}.`);
        // At the application start, perhaps the value in state was initialized before the subscribe method was called
        // Therefore, if the subscribed value os not null, undefined or an empty object or array
        // We immediately call the callback.
        const obj = getPropertyByPath(this.state, pathAsString);
        if (obj.found) {
            if (obj.object === null ||
                obj.object === undefined ||
                (Array.isArray(obj.object) && obj.object.length === 0) ||
                (obj.object instanceof Object && Object.keys(obj.object).length === 0)) {
                // Empty object => nothing to do
            }
            else {
                // Object is not null during the subscribe. => we call the callback
                const parentPath = pathAsString.substring(0, pathAsString.lastIndexOf('.'));
                const parentObject = getPropertyByPath(this.state, parentPath);
                callback(null, obj.object, parentObject.object);
            }
        }
        return callback;
    }
    unsubscribe(callbacks) {
        (Array.isArray(callbacks) ? callbacks : [callbacks]).forEach((callback) => {
            let found = false;
            for (const path in this.callbacks) {
                const callbacks = this.callbacks[path];
                const index = callbacks.indexOf(callback);
                if (index !== -1) {
                    found = true;
                    callbacks.splice(index, 1);
                    console.debug(`Unsubscribing to ${path}. ${this.callbacks[path].length} subscribtions remaining.`);
                }
            }
            if (!found) {
                throw Error(`Cannot unsubscribe this callback : it does not exist`);
            }
        });
    }
    batchChanges(statechanges) {
        this.stateProxy.delay(statechanges);
    }
}
export default StateManager;