Spring Framework example source code file (DelegatingDataSource.java)

This example Spring Framework source code file (DelegatingDataSource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

connection, connection, datasource, datasource, delegatingdatasource, delegatingdatasource, illegalargumentexception, initializingbean, io, jdbc, object, printwriter, property, sql, sqlexception, sqlexception, string

The Spring Framework DelegatingDataSource.java source code

/*
 * Copyright 2002-2007 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 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}.
 *
 * <p>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;
	}

	public void afterPropertiesSet() {
		if (getTargetDataSource() == null) {
			throw new IllegalArgumentException("Property 'targetDataSource' is required");
		}
	}


	public Connection getConnection() throws SQLException {
		return getTargetDataSource().getConnection();
	}

	public Connection getConnection(String username, String password) throws SQLException {
		return getTargetDataSource().getConnection(username, password);
	}

	public PrintWriter getLogWriter() throws SQLException {
		return getTargetDataSource().getLogWriter();
	}

	public void setLogWriter(PrintWriter out) throws SQLException {
		getTargetDataSource().setLogWriter(out);
	}

	public int getLoginTimeout() throws SQLException {
		return getTargetDataSource().getLoginTimeout();
	}

	public void setLoginTimeout(int seconds) throws SQLException {
		getTargetDataSource().setLoginTimeout(seconds);
	}


	//---------------------------------------------------------------------
	// Implementation of JDBC 4.0's Wrapper interface
	//---------------------------------------------------------------------

	public Object unwrap(Class iface) throws SQLException {
		return getTargetDataSource().unwrap(iface);
	}

	public boolean isWrapperFor(Class iface) throws SQLException {
		return getTargetDataSource().isWrapperFor(iface);
	}

}