diff -r fd16c54261b3 -r 90ce3da70b43 jdk/src/share/classes/sun/applet/AppletEventMulticaster.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/applet/AppletEventMulticaster.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,127 @@
+/*
+ * Copyright 1997 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.applet;
+
+import java.util.EventListener;
+import java.io.Serializable;
+import java.io.ObjectOutputStream;
+import java.io.IOException;
+
+/**
+ * AppletEventMulticaster class.  This class manages an immutable
+ * structure consisting of a chain of AppletListeners and is
+ * responsible for dispatching events to them.
+ *
+ * @author  Sunita Mani
+ */
+public class AppletEventMulticaster implements AppletListener {
+
+    private final AppletListener a, b;
+
+    public AppletEventMulticaster(AppletListener a, AppletListener b) {
+        this.a = a; this.b = b;
+    }
+
+    public void appletStateChanged(AppletEvent e) {
+        a.appletStateChanged(e);
+        b.appletStateChanged(e);
+    }
+
+    /**
+     * Adds Applet-listener-a with Applet-listener-b and
+     * returns the resulting multicast listener.
+     * @param a Applet-listener-a
+     * @param b Applet-listener-b
+     */
+    public static AppletListener add(AppletListener a, AppletListener b) {
+        return addInternal(a, b);
+    }
+
+    /**
+     * Removes the old Applet-listener from Applet-listener-l and
+     * returns the resulting multicast listener.
+     * @param l Applet-listener-l
+     * @param oldl the Applet-listener being removed
+     */
+    public static AppletListener remove(AppletListener l, AppletListener oldl) {
+        return removeInternal(l, oldl);
+    }
+
+    /**
+     * Returns the resulting multicast listener from adding listener-a
+     * and listener-b together.
+     * If listener-a is null, it returns listener-b;
+     * If listener-b is null, it returns listener-a
+     * If neither are null, then it creates and returns
+     * a new AppletEventMulticaster instance which chains a with b.
+     * @param a event listener-a
+     * @param b event listener-b
+     */
+    private static AppletListener addInternal(AppletListener a, AppletListener b) {
+        if (a == null)  return b;
+        if (b == null)  return a;
+        return new AppletEventMulticaster(a, b);
+    }
+
+
+    /**
+     * Removes a listener from this multicaster and returns the
+     * resulting multicast listener.
+     * @param oldl the listener to be removed
+     */
+    protected AppletListener remove(AppletListener oldl) {
+        if (oldl == a)  return b;
+        if (oldl == b)  return a;
+        AppletListener a2 = removeInternal(a, oldl);
+        AppletListener b2 = removeInternal(b, oldl);
+        if (a2 == a && b2 == b) {
+            return this;        // it's not here
+        }
+        return addInternal(a2, b2);
+    }
+
+
+    /**
+     * Returns the resulting multicast listener after removing the
+     * old listener from listener-l.
+     * If listener-l equals the old listener OR listener-l is null,
+     * returns null.
+     * Else if listener-l is an instance of AppletEventMulticaster
+     * then it removes the old listener from it.
+     * Else, returns listener l.
+     * @param l the listener being removed from
+     * @param oldl the listener being removed
+     */
+    private static AppletListener removeInternal(AppletListener l, AppletListener oldl) {
+        if (l == oldl || l == null) {
+            return null;
+        } else if (l instanceof AppletEventMulticaster) {
+            return ((AppletEventMulticaster)l).remove(oldl);
+        } else {
+            return l;           // it's not here
+        }
+    }
+}