cn.beecp.pool.ProxyDatabaseMetaDataBase Maven / Gradle / Ivy
/*
* Copyright Chris2018998
*
* 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 cn.beecp.pool;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
/**
* DatabaseMetaDataBase wrapper
*
* @author Chris.Liao
* @version 1.0
*/
abstract class ProxyDatabaseMetaDataBase implements DatabaseMetaData {
protected DatabaseMetaData delegate;
protected PooledConnection pConn;//called by subclass to update time
protected ProxyConnectionBase proxyConn;//called by subclass to check close state
public ProxyDatabaseMetaDataBase(DatabaseMetaData metaData,ProxyConnectionBase proxyConn,PooledConnection pConn) {
this.pConn=pConn;
this.delegate=metaData;
this.proxyConn=proxyConn;
}
public Connection getConnection() throws SQLException{
checkClose();
return proxyConn;
}
protected void checkClose() throws SQLException {
proxyConn.checkClose();
}
public boolean isWrapperFor(Class iface) throws SQLException {
checkClose();
return iface.isInstance(delegate);
}
@SuppressWarnings("unchecked")
public T unwrap(Class iface) throws SQLException{
checkClose();
if (iface.isInstance(delegate)) {
return (T)this;
}else {
throw new SQLException("Wrapped object is not an instance of " + iface);
}
}
}