--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/sql/Wrapper.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2005-2006 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 java.sql;
+
+/**
+ * Interface for JDBC classes which provide the ability to retrieve the delegate instance when the instance
+ * in question is in fact a proxy class.
+ * <p>
+ * The wrapper pattern is employed by many JDBC driver implementations to provide extensions beyond
+ * the traditional JDBC API that are specific to a data source. Developers may wish to gain access to
+ * these resources that are wrapped (the delegates) as  proxy class instances representing the
+ * the actual resources. This interface describes a standard mechanism to access
+ * these wrapped resources
+ * represented by their proxy, to permit direct access to the resource delegates.
+ *
+ * @since 1.6
+ */
+
+public interface Wrapper {
+
+    /**
+     * Returns an object that implements the given interface to allow access to
+     * non-standard methods, or standard methods not exposed by the proxy.
+     *
+     * If the receiver implements the interface then the result is the receiver
+     * or a proxy for the receiver. If the receiver is a wrapper
+     * and the wrapped object implements the interface then the result is the
+     * wrapped object or a proxy for the wrapped object. Otherwise return the
+     * the result of calling <code>unwrap</code> recursively on the wrapped object
+     * or a proxy for that result. If the receiver is not a
+     * wrapper and does not implement the interface, then an <code>SQLException</code> is thrown.
+     *
+     * @param iface A Class defining an interface that the result must implement.
+     * @return an object that implements the interface. May be a proxy for the actual implementing object.
+     * @throws java.sql.SQLException If no object found that implements the interface
+     * @since 1.6
+     */
+        <T> T unwrap(java.lang.Class<T> iface) throws java.sql.SQLException;
+
+    /**
+     * Returns true if this either implements the interface argument or is directly or indirectly a wrapper
+     * for an object that does. Returns false otherwise. If this implements the interface then return true,
+     * else if this is a wrapper then return the result of recursively calling <code>isWrapperFor</code> on the wrapped
+     * object. If this does not implement the interface and is not a wrapper, return false.
+     * This method should be implemented as a low-cost operation compared to <code>unwrap</code> so that
+     * callers can use this method to avoid expensive <code>unwrap</code> calls that may fail. If this method
+     * returns true then calling <code>unwrap</code> with the same argument should succeed.
+     *
+     * @param iface a Class defining an interface.
+     * @return true if this implements the interface or directly or indirectly wraps an object that does.
+     * @throws java.sql.SQLException  if an error occurs while determining whether this is a wrapper
+     * for an object with the given interface.
+     * @since 1.6
+     */
+    boolean isWrapperFor(java.lang.Class<?> iface) throws java.sql.SQLException;
+
+}