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/*
Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program 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 for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLClientInfoException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
/**
* An implementation of JDBC4ClientInfoProvider that exposes the client info as a comment prepended to all statements issued by the driver.
*
* Client information is <i>never</i> read from the server with this implementation, it is always cached locally.
*/
public class JDBC4CommentClientInfoProvider implements JDBC4ClientInfoProvider {
private Properties clientInfo;
public synchronized void initialize(java.sql.Connection conn, Properties configurationProps) throws SQLException {
this.clientInfo = new Properties();
}
public synchronized void destroy() throws SQLException {
this.clientInfo = null;
}
public synchronized Properties getClientInfo(java.sql.Connection conn) throws SQLException {
return this.clientInfo;
}
public synchronized String getClientInfo(java.sql.Connection conn, String name) throws SQLException {
return this.clientInfo.getProperty(name);
}
public synchronized void setClientInfo(java.sql.Connection conn, Properties properties) throws SQLClientInfoException {
this.clientInfo = new Properties();
Enumeration propNames = properties.propertyNames();
while (propNames.hasMoreElements()) {
String name = (String) propNames.nextElement();
this.clientInfo.put(name, properties.getProperty(name));
}
setComment(conn);
}
public synchronized void setClientInfo(java.sql.Connection conn, String name, String value) throws SQLClientInfoException {
this.clientInfo.setProperty(name, value);
setComment(conn);
}
private synchronized void setComment(java.sql.Connection conn) {
StringBuilder commentBuf = new StringBuilder();
Iterator elements = this.clientInfo.entrySet().iterator();
while (elements.hasNext()) {
if (commentBuf.length() > 0) {
commentBuf.append(", ");
}
Map.Entry entry = (Map.Entry) elements.next();
commentBuf.append("" + entry.getKey());
commentBuf.append("=");
commentBuf.append("" + entry.getValue());
}
((com.mysql.jdbc.Connection) conn).setStatementComment(commentBuf.toString());
}
}