6 files changed, 68 insertions, 0 deletions
diff --git a/src/jrummikub/util/Event.java b/src/jrummikub/util/Event.java
new file mode 100644
index 0000000..0b2317f
--- /dev/null
+++ b/src/jrummikub/util/Event.java
@@ -0,0 +1,23 @@
+package jrummikub.util;
+
+import java.util.HashSet;
+
+public class Event implements IEvent {
+  private HashSet<IListener> listeners = new HashSet<IListener>();
+  
+  @Override
+  public void add(IListener listener) {
+    listeners.add(listener);
+  }
+
+  @Override
+  public void remove(IListener listener) {
+    listeners.remove(listener);
+  }
+
+  public void fire() {
+    for (IListener listener : listeners) {
+      listener.fire();
+    }
+  }
+}
diff --git a/src/jrummikub/util/Event1.java b/src/jrummikub/util/Event1.java
new file mode 100644
index 0000000..e8ccb43
--- /dev/null
+++ b/src/jrummikub/util/Event1.java
@@ -0,0 +1,23 @@
+package jrummikub.util;
+
+import java.util.HashSet;
+
+public class Event1<T> implements IEvent1<T> {
+  private HashSet<IListener1<T>> listeners = new HashSet<IListener1<T>>();
+  
+  @Override
+  public void add(IListener1<T> listener) {
+    listeners.add(listener);
+  }
+
+  @Override
+  public void remove(IListener1<T> listener) {
+    listeners.remove(listener);
+  }
+
+  public void fire(T value) {
+    for (IListener1<T> listener : listeners) {
+      listener.fire(value);
+    }
+  }
+}
diff --git a/src/jrummikub/util/IEvent.java b/src/jrummikub/util/IEvent.java
new file mode 100644
index 0000000..ce0e13d
--- /dev/null
+++ b/src/jrummikub/util/IEvent.java
@@ -0,0 +1,6 @@
+package jrummikub.util;
+
+public interface IEvent {
+  public void add(IListener listener);
+  public void remove(IListener listener);
+}
diff --git a/src/jrummikub/util/IEvent1.java b/src/jrummikub/util/IEvent1.java
new file mode 100644
index 0000000..47075db
--- /dev/null
+++ b/src/jrummikub/util/IEvent1.java
@@ -0,0 +1,6 @@
+package jrummikub.util;
+
+public interface IEvent1<T> {
+  public void add(IListener1<T> listener);
+  public void remove(IListener1<T> listener);
+}
diff --git a/src/jrummikub/util/IListener.java b/src/jrummikub/util/IListener.java
new file mode 100644
index 0000000..37d79c0
--- /dev/null
+++ b/src/jrummikub/util/IListener.java
@@ -0,0 +1,5 @@
+package jrummikub.util;
+
+public interface IListener {
+  public void fire();
+}
diff --git a/src/jrummikub/util/IListener1.java b/src/jrummikub/util/IListener1.java
new file mode 100644
index 0000000..8dfeaf3
--- /dev/null
+++ b/src/jrummikub/util/IListener1.java
@@ -0,0 +1,5 @@
+package jrummikub.util;
+
+public interface IListener1<T> {
+  public void fire(T value);
+}