Druid/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java

/*
 * Copyright 1999-2011 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 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 (iface == null) {
            return false;
        }

        if (iface.isInstance(this)) {
            return true;
        }

        return wrapper.isWrapperFor(iface);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        if (iface == null) {
            return null;
        }

        if (iface.isInstance(this)) {
            return (T) this;
        }

        return wrapper.unwrap(iface);
    }

}