net.yetamine.osgi.jdbc.support.DriverManagerAdapter Maven / Gradle / Ivy
/*
* Copyright 2016 Yetamine
*
* 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 net.yetamine.osgi.jdbc.support;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import net.yetamine.osgi.jdbc.DriverProvider;
import net.yetamine.osgi.jdbc.DriverSequence;
/**
* Adapts {@link DriverManager} to {@link DriverProvider} interface.
*
*
* The implementation is a singleton that other clients, including other
* implementations of {@link DriverProvider}, may use to use out-of-OSGi
* services, e.g., drivers registered prior OSGi framework launch. This adapter
* therefore may serve as a natural fallback for the other implementations that
* might not use {@link DriverManager} directly because of either classloading
* restrictions or interference with the weaving hook installed by this bundle.
*/
public final class DriverManagerAdapter implements DriverProvider {
/* Implementation note:
*
* For this class to work better, 'DynamicImport-Package: *' should be
* specified for this bundle, which allows this class to see more drivers,
* although possibly not all. Usually, the drivers should be intercepted
* by the weaving hook and bridging, but those that can't be intercepted
* needs this kind of support.
*/
/** Sole instance of this class. */
private static final DriverProvider INSTANCE = new DriverManagerAdapter();
/**
* Creates a new instance.
*/
private DriverManagerAdapter() {
// Default constructor
}
/**
* Returns an instance.
*
* @return an instance
*/
public static DriverProvider instance() {
return INSTANCE;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return getClass().getName();
}
/**
* @see net.yetamine.osgi.jdbc.DriverProvider#connection(java.lang.String,
* java.util.Properties)
*/
public Connection connection(String url, Properties properties) throws SQLException {
return DriverManager.getConnection(url, properties);
}
/**
* @see net.yetamine.osgi.jdbc.DriverProvider#driver(java.lang.String)
*/
public Driver driver(String url) throws SQLException {
return DriverManager.getDriver(url);
}
/**
* @see net.yetamine.osgi.jdbc.DriverProvider#drivers()
*/
public DriverSequence drivers() {
return () -> EnumerationIterator.from(DriverManager.getDrivers());
}
}