From 7c279747beb43c7e88633a6228a155a30e6834f7 Mon Sep 17 00:00:00 2001
From: Benjamin Culkin <scorpress@gmail.com>
Date: Mon, 27 May 2024 11:38:33 -0400
Subject: Initial import

---
 .../israfil/foundation/valuemodel/Observable.java  | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 israfil-foundation-valuemodel/src/main/java/net/israfil/foundation/valuemodel/Observable.java

(limited to 'israfil-foundation-valuemodel/src/main/java/net/israfil/foundation/valuemodel/Observable.java')

diff --git a/israfil-foundation-valuemodel/src/main/java/net/israfil/foundation/valuemodel/Observable.java b/israfil-foundation-valuemodel/src/main/java/net/israfil/foundation/valuemodel/Observable.java
new file mode 100644
index 0000000..574c8cf
--- /dev/null
+++ b/israfil-foundation-valuemodel/src/main/java/net/israfil/foundation/valuemodel/Observable.java
@@ -0,0 +1,37 @@
+/* 
+ * Copyright (c) 2003-2007 Israfil Consulting Services Corporation
+ * Copyright (c) 2003-2007 Christian Edward Gruber
+ * All Rights Reserved
+ *
+ * $Id: Types.java 129 2006-12-31 23:20:02Z cgruber $
+ */
+package net.israfil.foundation.valuemodel;
+
+/**
+ * An interface for objects that can notify observers of changes to itself.  The
+ * changing object should call the provided callback signature, with the 
+ * parameter being the object that was changed in its new state.
+ * 
+ * Using a dynamic selector rather than a strong interface allows code
+ * to be notified of the change even if it was not constructed with the 
+ * notification interface, though it does need to match the signature.
+ * 
+ * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber</a>
+ * @author Latest: $Author: cgruber $
+ * @version $Revision: 129 $
+ */
+public interface Observable {
+
+    /** Add an observer to this object, with a callback method spec that will
+     * be invoked upon a data change.  The callback method should contain three
+     * object parameters, one for the sender, one for the old value, and one for
+     * the new value.  The meaning of the value (same object, copy, values, etc.)
+     * is left to the implementation object and the observers.
+     */
+    public void addObservers(String callback, Object ... observers);
+    /** 
+     * Remove observer from observable object.
+     */
+    public void removeObservers(Object ... observers);
+    
+}
-- 
cgit v1.2.3