h2o.common.util.dao.datasource.AbstractDataSource.java Source code

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Here is the source code for h2o.common.util.dao.datasource.AbstractDataSource.java

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/*
 * 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 h2o.common.util.dao.datasource;

import h2o.common.spring.util.Assert;

import java.io.PrintWriter;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
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 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);
    }

    // jdk6+
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        throw new SQLFeatureNotSupportedException();
    }
}