diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/TimeZoneRegistryFactory.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/TimeZoneRegistryFactory.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,78 @@
+/**
+ * Copyright (c) 2012, Ben Fortuna
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  o Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ *  o Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ *  o Neither the name of Ben Fortuna nor the names of any other contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.fortuna.ical4j.model;
+
+import net.fortuna.ical4j.util.Configurator;
+
+/**
+ * $Id$
+ *
+ * Created on 18/09/2005
+ *
+ * Provides access to the configured <code>TimeZoneRegistry</code> instance.
+ * Alternative factory implementations may be specified via the following
+ * system property:
+ * <pre>net.fortuna.ical4j.timezone.registry=&lt;factory_class_name&gt;</pre>
+ * @author Ben Fortuna
+ */
+public abstract class TimeZoneRegistryFactory {
+    
+    /**
+     * The system property used to specify an alternate
+     * <code>TimeZoneRegistryFactory</code> implementation.
+     */
+    public static final String KEY_FACTORY_CLASS = "net.fortuna.ical4j.timezone.registry";
+
+    private static TimeZoneRegistryFactory instance;
+    static {
+        try {
+            final Class factoryClass = Class.forName(Configurator.getProperty(KEY_FACTORY_CLASS));
+            instance = (TimeZoneRegistryFactory) factoryClass.newInstance();
+        }
+        catch (Exception e) {
+            instance = new DefaultTimeZoneRegistryFactory();
+        }
+    }
+    
+    /**
+     * @return a shared factory instance
+     */
+    public static TimeZoneRegistryFactory getInstance() {
+        return instance;
+    }
+    
+    /**
+     * Returns a new instance of the configured <code>TimeZoneRegistry</code>.
+     * @return a timezone registry instance
+     */
+    public abstract TimeZoneRegistry createRegistry();
+}