/*
* Copyright 1999-2017 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.druid.pool;
import com.alibaba.druid.proxy.jdbc.WrapperProxy;
import java.sql.SQLException;
import java.sql.Wrapper;
/**
* @author wenshao [szujobs@hotmail.com]
*/
public class PoolableWrapper implements Wrapper {
private final Wrapper wrapper;
public PoolableWrapper(Wrapper wraaper){
this.wrapper = wraaper;
}
@Override
public boolean isWrapperFor(Class<?> iface) throws SQLException {
if (null == wrapper) {
//Best to log error.
return false;
}
if (iface == null) {
return false;
}
if (iface == wrapper.getClass()) {
return true;
}
if (iface == this.getClass()) {
return true;
}
if (!(wrapper instanceof WrapperProxy)) {
if (iface.isInstance(wrapper)) {
return true;
}
}
return wrapper.isWrapperFor(iface);
}
@SuppressWarnings("unchecked")
@Override
public <T> T unwrap(Class<T> iface) throws SQLException {
if (null == wrapper) {
//Best to log error.
return null;
}
if (iface == null) {
return null;
}
if (iface == wrapper.getClass()) {
return (T) wrapper;
}
if (iface == this.getClass()) {
return (T) this;
}
if (!(wrapper instanceof WrapperProxy)) {
if (iface.isInstance(wrapper)) {
return (T) wrapper;
}
}
return wrapper.unwrap(iface);
}
}