From 3335b1dfa9b429d90088184f58daff01e84432f2 Mon Sep 17 00:00:00 2001
From: Robert Williams <robert.williams@isode.com>
Date: Mon, 22 Apr 2013 16:23:48 +0100
Subject: Add 4 parameter signal/slot object

Direct copy of current signal/slot implementation,
with 4 generic parameters.

Change-Id: I4b2cb37fd134e80e8481950030b6e8721f4f2854

diff --git a/src/com/isode/stroke/signals/Signal4.java b/src/com/isode/stroke/signals/Signal4.java
new file mode 100644
index 0000000..6a29641
--- /dev/null
+++ b/src/com/isode/stroke/signals/Signal4.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2012-2013, Isode Limited, London, England.
+ * All rights reserved.
+ */
+
+package com.isode.stroke.signals;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.isode.stroke.signals.SignalConnection;
+import com.isode.stroke.signals.Slot;
+
+
+/**
+ * An approximation of the boost::signals system with 4 parameters
+ * @param <T1> Type 1
+ * @param <T2> Type 2
+ * @param <T3> Type 3
+ * @param <T4> Type 4
+ */
+public class Signal4<T1, T2, T3, T4> {
+    private final Map<SignalConnection, Slot4<T1, T2, T3, T4> > binds_ = Collections.synchronizedMap(
+            new HashMap<SignalConnection, Slot4<T1, T2, T3, T4> >());
+
+    /**
+     * Add a slot which will be notified
+     * @param bind slot, not null
+     * @return signal connection
+     */
+    public SignalConnection connect(Slot4<T1, T2, T3, T4> bind) {
+        final SignalConnection connection = new SignalConnection();
+        binds_.put(connection, bind);
+        connection.onDestroyed.connect(new Slot() {
+            public void call() {
+                binds_.remove(connection);
+            }
+        });
+        return connection;
+    }
+
+    /**
+     * Notify all slots(listeners)
+     * @param p1 parameter value 1
+     * @param p2 parameter value 2
+     * @param p3 parameter value 3
+     * @param p4 parameter value 4
+     */
+    public void emit(T1 p1, T2 p2, T3 p3, T4 p4) {
+        List<Slot4<T1, T2, T3, T4>> binds = new ArrayList<Slot4<T1, T2, T3, T4>>();
+        binds.addAll(binds_.values());
+        for (Slot4<T1, T2, T3, T4> bind : binds) {
+            bind.call(p1, p2, p3, p4);
+        }
+    }
+
+    /**
+     * Remove all slots(listeners)
+     */
+    public void disconnectAll() {
+        binds_.clear();
+    }
+}
diff --git a/src/com/isode/stroke/signals/Slot4.java b/src/com/isode/stroke/signals/Slot4.java
new file mode 100644
index 0000000..02e6fd9
--- /dev/null
+++ b/src/com/isode/stroke/signals/Slot4.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2012 - 2013, Isode Limited, London, England.
+ * All rights reserved.
+ */
+
+package com.isode.stroke.signals;
+
+/**
+ * Bind class for connecting to a signal with 4 parameters.
+ * @param <T1> Type 1
+ * @param <T2> Type 2
+ * @param <T3> Type 3
+ * @param <T4> Type 4
+ */
+public interface Slot4<T1, T2, T3, T4> {
+    /**
+     * This method will be called on notification from a signal
+     * @param p1 parameter value 1
+     * @param p2 parameter value 2
+     * @param p3 parameter value 3
+     * @param p4 parameter value 4
+     */
+    void call(T1 p1, T2 p2, T3 p3, T4 p4);
+}
-- 
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