From 3d202a04b99f0e61b6ccf8b7a5610e1a15ca58e7 Mon Sep 17 00:00:00 2001
From: Herbert Eiselt <herbert.eiselt@highstreet-technologies.com>
Date: Mon, 11 Feb 2019 14:54:12 +0100
Subject: Add sdnr wt odlux

Add complete sdnr wireless transport app odlux core and apps

Change-Id: I5dcbfb8f3b790e3bda7c8df67bd69d81958f65e5
Issue-ID: SDNC-576
Signed-off-by: Herbert Eiselt <herbert.eiselt@highstreet-technologies.com>
---
 sdnr/wt/odlux/framework/src/common/event.ts | 62 +++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 sdnr/wt/odlux/framework/src/common/event.ts

(limited to 'sdnr/wt/odlux/framework/src/common/event.ts')

diff --git a/sdnr/wt/odlux/framework/src/common/event.ts b/sdnr/wt/odlux/framework/src/common/event.ts
new file mode 100644
index 000000000..f71b0164a
--- /dev/null
+++ b/sdnr/wt/odlux/framework/src/common/event.ts
@@ -0,0 +1,62 @@
+/**
+  * Represents an event.
+  * Events enable a class or object to notify other classes or objects when something of interest occurs.
+  * The class that sends (or invokes) the event is called the publisher and the classes that receive (or handle) the event are called subscribers.
+  * 
+  * Objects can create an instances of an Events and offer that Events for other objects to attach to.
+  * Objects who want to be informed about an Event can attach a function (an event handler) to the event which is then called when the event is fired.
+  * 
+  * @template TEventArg Type of the event argument. Use void if the event does not has an argument.
+  */
+export class Event<TEventArg> {
+
+  /**
+   * Creates a new instance of the Event class.
+   */
+  constructor() {
+    this.eventHandlers = new Array<(arg: TEventArg) => void>();
+  }
+
+  /**
+   * Adds an event handler to this event, so that when the event is fired the given event handler function is called.
+   * 
+   * @param eventHandler The event handler function to add to this event.
+   * @throws {Error} Thrown if the given event handler function has already been added to this event.
+   */
+  public addHandler = (eventHandler: (arg: TEventArg) => void): void => {
+    if (this.eventHandlers.indexOf(eventHandler) > -1) {
+      throw new Error("The given event handler is already added to this event.");
+    }
+
+    this.eventHandlers.push(eventHandler);
+  }
+
+  /**
+   * Removes an event handler from this event, so that the given event handler function will not be called anymore when the event is fired.
+   * 
+   * @param eventHandler: The event handler function to remove.
+   * @throws {Error} Thrown if the given event handler function has not been added to this event before.
+   */
+  public removeHandler = (eventHandler: (arg: TEventArg) => void): void => {
+    const index = this.eventHandlers.indexOf(eventHandler);
+    if (!(index > -1)) {
+      throw new Error("The given event handler has not been added to this event yet.");
+    }
+
+    this.eventHandlers.splice(index, 1);
+  }
+
+  /**
+   * Invokes the event and calls all event handler functions currently registered on the event.
+   * 
+   * @param argument The argument for the event. The argument will be passed to all registered event handler functions.
+   */
+  public invoke = (argument?: TEventArg): void => {
+    this.eventHandlers.forEach((eventHandler: (arg?: TEventArg) => void, index: number, array: Array<(arg: TEventArg) => void>): void => {
+      eventHandler(argument);
+    });
+  }
+
+  private eventHandlers: Array<(arg?: TEventArg) => void>;
+
+}
-- 
cgit 1.2.3-korg