/*
* Copyright 2002-2008 the original author or authors.
*
* 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 org.springframework.jdbc.datasource;
import java.io.PrintWriter;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
/**
* Abstract base class for Spring's {@link javax.sql.DataSource}
* implementations, taking care of the padding.
*
* <p>'Padding' in the context of this class means default implementations
* for certain methods from the <code>DataSource</code> interface, such as
* {@link #getLoginTimeout()}, {@link #setLoginTimeout(int)}, and so forth.
*
* @author Juergen Hoeller
* @since 07.05.2003
* @see DriverManagerDataSource
*/
public abstract class AbstractDataSource implements DataSource {
/** Logger available to subclasses */
protected final Log logger = LogFactory.getLog(getClass());
/**
* Returns 0, indicating the default system timeout is to be used.
*/
public int getLoginTimeout() throws SQLException {
return 0;
}
/**
* Setting a login timeout is not supported.
*/
public void setLoginTimeout(int timeout) throws SQLException {
throw new UnsupportedOperationException("setLoginTimeout");
}
/**
* LogWriter methods are not supported.
*/
public PrintWriter getLogWriter() {
throw new UnsupportedOperationException("getLogWriter");
}
/**
* LogWriter methods are not supported.
*/
public void setLogWriter(PrintWriter pw) throws SQLException {
throw new UnsupportedOperationException("setLogWriter");
}
//---------------------------------------------------------------------
// Implementation of JDBC 4.0's Wrapper interface
//---------------------------------------------------------------------
@SuppressWarnings("unchecked")
public <T> T unwrap(Class<T> iface) throws SQLException {
Assert.notNull(iface, "Interface argument must not be null");
if (!DataSource.class.equals(iface)) {
throw new SQLException("DataSource of type [" + getClass().getName() +
"] can only be unwrapped as [javax.sql.DataSource], not as [" + iface.getName());
}
return (T) this;
}
public boolean isWrapperFor(Class<?> iface) throws SQLException {
return DataSource.class.equals(iface);
}
}
|