theatre-events/dist/next/src/event-dispatcher/synchronous-event-dispatcher.js

A full implementation of a standard event dispatcher for javascript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const event_listener_1 = require("./../event-listener");
/**
 * Dispatch events synchronously through your application.
 */
class SynchronousEventDispatcher {
    constructor() {
        this.eventListeners = new Map();
    }
    /**
     * {@inheritdoc}
     */
    dispatch(name, payload) {
        if (!this.eventListeners.has(name)) {
            return payload;
        }
        let priorities = [];
        this.eventListeners.get(name).forEach((l, priority) => {
            priorities.push(priority);
        });
        priorities.sort().map((priority) => {
            this.eventListeners.get(name).get(priority).map(l => l(payload));
        });
        return payload;
    }
    /**
     * {@inheritdoc}
     */
    addEventListener(name, listener) {
        listener.priority = listener.priority || event_listener_1.NORMAL_PRIORITY;
        if (!this.eventListeners.has(name)) {
            this.eventListeners.set(name, new Map());
        }
        if (!this.eventListeners.get(name).has(listener.priority)) {
            this.eventListeners.get(name).set(listener.priority, []);
        }
        this.eventListeners.get(name).get(listener.priority).push(listener);
    }
    /**
     * {@inheritdoc}
     */
    removeEventListener(name, listener) {
        if (!this.eventListeners.has(name)) {
            return;
        }
        this.eventListeners.get(name).forEach((listeners, index) => {
            listeners.map((registeredListener, i) => {
                if (registeredListener !== listener) {
                    return;
                }
                listeners.splice(i, 1);
            });
            if (!listeners.length) {
                this.eventListeners.get(name).delete(index);
            }
        });
        if (!this.eventListeners.get(name).size) {
            this.eventListeners.delete(name);
        }
    }
    /**
     * {@inheritdoc}
     */
    clearEventListeners(name) {
        if (!name) {
            this.eventListeners.clear();
            return;
        }
        if (!this.eventListeners.has(name)) {
            return;
        }
        this.eventListeners.get(name).clear();
    }
}
exports.default = SynchronousEventDispatcher;
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