3 files changed, 96 insertions, 0 deletions
diff --git a/src/jrummikub/util/Event3.java b/src/jrummikub/util/Event3.java
new file mode 100644
index 0000000..a309111
--- /dev/null
+++ b/src/jrummikub/util/Event3.java
@@ -0,0 +1,46 @@
+package jrummikub.util;
+
+import java.util.HashSet;
+
+/**
+ * Simple single parameter event generator
+ * 
+ * @param <T1>
+ *            type of the first event parameter
+ * @param <T2>
+ *            type of the second event parameter
+ */
+public class Event3<T1, T2, T3> implements IEvent3<T1, T2, T3> {
+	private HashSet<IListener3<T1, T2, T3>> listeners = new HashSet<IListener3<T1, T2, T3>>();
+
+	@Override
+	public Connection add(final IListener3<T1, T2, T3> listener) {
+		listeners.add(listener);
+		return new Connection() {
+
+			@Override
+			public void remove() {
+				Event3.this.remove(listener);
+			}
+		};
+	}
+
+	@Override
+	public void remove(IListener3<T1, T2, T3> listener) {
+		listeners.remove(listener);
+	}
+
+	/**
+	 * Generate a single event
+	 * 
+	 * @param value1
+	 *            the first event parameter
+	 * @param value2
+	 *            the second event parameter
+	 */
+	public void emit(T1 value1, T2 value2, T3 value3) {
+		for (IListener3<T1, T2, T3> listener : listeners) {
+			listener.handle(value1, value2, value3);
+		}
+	}
+}
diff --git a/src/jrummikub/util/IEvent3.java b/src/jrummikub/util/IEvent3.java
new file mode 100644
index 0000000..fd04364
--- /dev/null
+++ b/src/jrummikub/util/IEvent3.java
@@ -0,0 +1,28 @@
+package jrummikub.util;
+
+/**
+ * Interface for classes that can generate events having a two parameters
+ * 
+ * @param <T1>
+ *            type of the first event parameter
+ * @param <T2>
+ *            type of the second event parameter
+ */
+public interface IEvent3<T1, T2, T3> {
+	/**
+	 * Start to publish all events to a given listener
+	 * 
+	 * @param listener
+	 *            target listener
+	 * @return a connection to remove the listener
+	 */
+	public Connection add(IListener3<T1, T2, T3> listener);
+
+	/**
+	 * Stop publishing events to a given listener
+	 * 
+	 * @param listener
+	 *            target listener
+	 */
+	public void remove(IListener3<T1, T2, T3> listener);
+}
diff --git a/src/jrummikub/util/IListener3.java b/src/jrummikub/util/IListener3.java
new file mode 100644
index 0000000..ae1d6ce
--- /dev/null
+++ b/src/jrummikub/util/IListener3.java
@@ -0,0 +1,22 @@
+package jrummikub.util;
+
+/**
+ * Interface for classes that can receive parameterless events having a two
+ * parameters
+ * 
+ * @param <T1>
+ *            type of the first event parameter
+ * @param <T2>
+ *            type of the first event parameter
+ */
+public interface IListener3<T1, T2, T3> {
+	/**
+	 * This method is called whenever a class we're listening to emits an event
+	 * 
+	 * @param value1
+	 *            the first event parameter
+	 * @param value2
+	 *            the second event parameter
+	 */
+	public void handle(T1 value1, T2 value2, T3 value3);
+}