org.springframework.jdbc.datasource.AbstractDataSource.java Source code

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Here is the source code for org.springframework.jdbc.datasource.AbstractDataSource.java

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/*
 * 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.SQLException;
import java.util.logging.Logger;
import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 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.
     */
    @Override
    public int getLoginTimeout() throws SQLException {
        return 0;
    }

    /**
     * Setting a login timeout is not supported.
     */
    @Override
    public void setLoginTimeout(int timeout) throws SQLException {
        throw new UnsupportedOperationException("setLoginTimeout");
    }

    /**
     * LogWriter methods are not supported.
     */
    @Override
    public PrintWriter getLogWriter() {
        throw new UnsupportedOperationException("getLogWriter");
    }

    /**
     * LogWriter methods are not supported.
     */
    @Override
    public void setLogWriter(PrintWriter pw) throws SQLException {
        throw new UnsupportedOperationException("setLogWriter");
    }

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

    @Override
    @SuppressWarnings("unchecked")
    public <T> T unwrap(Class<T> iface) throws SQLException {
        if (iface.isInstance(this)) {
            return (T) this;
        }
        throw new SQLException("DataSource of type [" + getClass().getName() + "] cannot be unwrapped as ["
                + iface.getName() + "]");
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        return iface.isInstance(this);
    }

    //---------------------------------------------------------------------
    // Implementation of JDBC 4.1's getParentLogger method
    //---------------------------------------------------------------------

    @Override
    public Logger getParentLogger() {
        return Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);
    }

}