Spring Framework example source code file (AbstractDataSource.java)

This example Spring Framework source code file (AbstractDataSource.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

abstractdatasource, datasource, datasource, interface, io, jdbc, log, object, printwriter, printwriter, sql, sqlexception, sqlexception, unsupportedoperationexception, unsupportedoperationexception

The Spring Framework AbstractDataSource.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.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 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
	//---------------------------------------------------------------------

	public Object unwrap(Class 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 this;
	}

	public boolean isWrapperFor(Class iface) throws SQLException {
		return DataSource.class.equals(iface);
	}

}