2362N/A * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * Interface for JDBC classes which provide the ability to retrieve the delegate instance when the instance 0N/A * in question is in fact a proxy class. 0N/A * The wrapper pattern is employed by many JDBC driver implementations to provide extensions beyond 0N/A * the traditional JDBC API that are specific to a data source. Developers may wish to gain access to 0N/A * these resources that are wrapped (the delegates) as proxy class instances representing the 0N/A * the actual resources. This interface describes a standard mechanism to access 0N/A * these wrapped resources 0N/A * represented by their proxy, to permit direct access to the resource delegates. 0N/A * Returns an object that implements the given interface to allow access to 0N/A * non-standard methods, or standard methods not exposed by the proxy. 0N/A * If the receiver implements the interface then the result is the receiver 0N/A * or a proxy for the receiver. If the receiver is a wrapper 0N/A * and the wrapped object implements the interface then the result is the 0N/A * wrapped object or a proxy for the wrapped object. Otherwise return the 0N/A * the result of calling <code>unwrap</code> recursively on the wrapped object 0N/A * or a proxy for that result. If the receiver is not a 0N/A * wrapper and does not implement the interface, then an <code>SQLException</code> is thrown. 0N/A * @param iface A Class defining an interface that the result must implement. 0N/A * @return an object that implements the interface. May be a proxy for the actual implementing object. 0N/A * @throws java.sql.SQLException If no object found that implements the interface 0N/A * Returns true if this either implements the interface argument or is directly or indirectly a wrapper 0N/A * for an object that does. Returns false otherwise. If this implements the interface then return true, 0N/A * else if this is a wrapper then return the result of recursively calling <code>isWrapperFor</code> on the wrapped 0N/A * object. If this does not implement the interface and is not a wrapper, return false. 0N/A * This method should be implemented as a low-cost operation compared to <code>unwrap</code> so that 0N/A * callers can use this method to avoid expensive <code>unwrap</code> calls that may fail. If this method 0N/A * returns true then calling <code>unwrap</code> with the same argument should succeed. 0N/A * @param iface a Class defining an interface. 0N/A * @return true if this implements the interface or directly or indirectly wraps an object that does. 0N/A * @throws java.sql.SQLException if an error occurs while determining whether this is a wrapper 0N/A * for an object with the given interface.