| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.sql; |
| |
| /** |
| * This class is an actual usage of the wrapper pattern for JDBC classes. |
| * Developers can get the delegate instance when the instance may be a proxy |
| * class. |
| * |
| * @since 1.6 |
| */ |
| public interface Wrapper { |
| |
| /** |
| * Returns an object that implements the given interface. If the caller is |
| * not a wrapper, a SQLException will be thrown. |
| * |
| * @param iface - |
| * the class that defines the interface |
| * @return - an object that implements the interface |
| * @throws SQLException - |
| * if there is no object implementing the specific interface |
| */ |
| <T> T unwrap(Class<T> iface) throws SQLException; |
| |
| /** |
| * If the caller is a wrapper of the class or implements the given |
| * interface, the methods return false and vice versa. |
| * |
| * @param iface - |
| * the class that defines the interface |
| * @return - true if the instance implements the interface |
| * @throws SQLException - |
| * when an error occurs when judges the object |
| */ |
| boolean isWrapperFor(Class<?> iface) throws SQLException; |
| } |