EssentialsUpdate WIP

1 files changed, 66 insertions, 0 deletions

diff --git a/EssentialsUpdate/src/f00f/net/irc/martyr/ForwardObservable.java b/EssentialsUpdate/src/f00f/net/irc/martyr/ForwardObservable.java
new file mode 100644
index 000000000..7f4d8d89a
--- /dev/null
+++ b/EssentialsUpdate/src/f00f/net/irc/martyr/ForwardObservable.java
@@ -0,0 +1,66 @@
+package f00f.net.irc.martyr;
+
+import java.util.Observer;
+import java.util.Observable;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Does notifications in the order they are added.
+ * */
+public class ForwardObservable extends Observable
+{
+	private boolean changed = true;
+	private List<Observer> obs = new LinkedList<Observer>();
+	private final Object localMonitor = new Object();
+
+
+	public void setChanged()
+	{
+		synchronized(localMonitor)
+		{
+			changed = true;
+		}
+	}
+
+	protected void clearChanged()
+	{
+		synchronized(localMonitor)
+		{
+			changed = false;
+		}
+	}
+	
+	public void addObserver( Observer o )
+	{
+		synchronized(localMonitor)
+		{
+			obs.add( o );
+		}
+	}
+
+	public void deleteObserver( Observer o )
+	{
+		synchronized(localMonitor)
+		{
+			obs.remove( o );
+		}
+	}
+
+	public void notifyObservers(Object arg) 
+	{
+		synchronized(localMonitor)
+		{
+			if (!changed)
+				return;
+			clearChanged();
+
+            for (Observer ob : obs) {
+                ob.update(this, arg);
+            }
+        }
+	}
+
+
+}
+