org.springframework.jdbc.datasource.DelegatingDataSource Maven / Gradle / Ivy
/*
* Copyright 2002-2012 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.Connection;
import java.sql.SQLException;
import java.util.logging.Logger;
import javax.sql.DataSource;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
/**
* JDBC {@link javax.sql.DataSource} implementation that delegates all calls
* to a given target {@link javax.sql.DataSource}.
*
* This class is meant to be subclassed, with subclasses overriding only
* those methods (such as {@link #getConnection()}) that should not simply
* delegate to the target DataSource.
*
* @author Juergen Hoeller
* @since 1.1
* @see #getConnection
*/
public class DelegatingDataSource implements DataSource, InitializingBean {
private DataSource targetDataSource;
/**
* Create a new DelegatingDataSource.
* @see #setTargetDataSource
*/
public DelegatingDataSource() {
}
/**
* Create a new DelegatingDataSource.
* @param targetDataSource the target DataSource
*/
public DelegatingDataSource(DataSource targetDataSource) {
setTargetDataSource(targetDataSource);
}
/**
* Set the target DataSource that this DataSource should delegate to.
*/
public void setTargetDataSource(DataSource targetDataSource) {
Assert.notNull(targetDataSource, "'targetDataSource' must not be null");
this.targetDataSource = targetDataSource;
}
/**
* Return the target DataSource that this DataSource should delegate to.
*/
public DataSource getTargetDataSource() {
return this.targetDataSource;
}
@Override
public void afterPropertiesSet() {
if (getTargetDataSource() == null) {
throw new IllegalArgumentException("Property 'targetDataSource' is required");
}
}
@Override
public Connection getConnection() throws SQLException {
return getTargetDataSource().getConnection();
}
@Override
public Connection getConnection(String username, String password) throws SQLException {
return getTargetDataSource().getConnection(username, password);
}
@Override
public PrintWriter getLogWriter() throws SQLException {
return getTargetDataSource().getLogWriter();
}
@Override
public void setLogWriter(PrintWriter out) throws SQLException {
getTargetDataSource().setLogWriter(out);
}
@Override
public int getLoginTimeout() throws SQLException {
return getTargetDataSource().getLoginTimeout();
}
@Override
public void setLoginTimeout(int seconds) throws SQLException {
getTargetDataSource().setLoginTimeout(seconds);
}
//---------------------------------------------------------------------
// Implementation of JDBC 4.0's Wrapper interface
//---------------------------------------------------------------------
@Override
@SuppressWarnings("unchecked")
public T unwrap(Class iface) throws SQLException {
if (iface.isInstance(this)) {
return (T) this;
}
return getTargetDataSource().unwrap(iface);
}
@Override
public boolean isWrapperFor(Class iface) throws SQLException {
return (iface.isInstance(this) || getTargetDataSource().isWrapperFor(iface));
}
//---------------------------------------------------------------------
// Implementation of JDBC 4.1's getParentLogger method
//---------------------------------------------------------------------
@Override
public Logger getParentLogger() {
return Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);
}
}