/* * Copyright ( c ) 2005 , 2020 , Oracle and / or its affiliates . 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 . Oracle designates this * particular file as subject to the " Classpath " exception as provided * by Oracle 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 Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA * or visit www . oracle . 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 } 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 } is thrown . * * @ param < T > the type of the class modeled by this Class object * @ 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 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 } 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 } so that * callers can use this method to avoid expensive { @ code unwrap } calls that may fail . If this method * returns true then calling { @ code unwrap } 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;
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