/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you 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.apache.openjpa.lib.jdbc; | |
import java.sql.Connection; | |
import java.sql.SQLException; | |
import java.util.Collection; | |
import java.util.Collections; | |
import java.util.Iterator; | |
import java.util.List; | |
import javax.sql.DataSource; | |
import java.util.concurrent.CopyOnWriteArrayList; | |
/** | |
* Delegating data source that maintains a list of {@link ConnectionDecorator}s. | |
* | |
* @author Abe White | |
* @nojavadoc | |
*/ | |
public class DecoratingDataSource extends DelegatingDataSource { | |
private List _decorators = new CopyOnWriteArrayList(); | |
/** | |
* Constructor. Supply wrapped data source. | |
*/ | |
public DecoratingDataSource(DataSource ds) { | |
super(ds); | |
} | |
/** | |
* Return a read-only list of connection decorators in the order they were | |
* added. | |
*/ | |
public Collection getDecorators() { | |
return Collections.unmodifiableCollection(_decorators); | |
} | |
/** | |
* Add a connection decorator. | |
*/ | |
public void addDecorator(ConnectionDecorator decorator) { | |
if (decorator != null) | |
_decorators.add(decorator); | |
} | |
/** | |
* Add multiple connection decorators efficiently. | |
*/ | |
public void addDecorators(Collection decorators) { | |
if (decorators != null) | |
_decorators.addAll(decorators); | |
} | |
/** | |
* Remove a connection decorator. | |
*/ | |
public boolean removeDecorator(ConnectionDecorator decorator) { | |
return _decorators.remove(decorator); | |
} | |
/** | |
* Clear all decorators. | |
*/ | |
public void clearDecorators() { | |
_decorators.clear(); | |
} | |
public Connection getConnection() throws SQLException { | |
Connection conn = super.getConnection(); | |
return decorate(conn); | |
} | |
public Connection getConnection(String user, String pass) | |
throws SQLException { | |
Connection conn = super.getConnection(user, pass); | |
return decorate(conn); | |
} | |
private Connection decorate(Connection conn) throws SQLException { | |
if (!_decorators.isEmpty()) | |
for (Iterator itr = _decorators.iterator(); itr.hasNext();) | |
conn = ((ConnectionDecorator) itr.next()).decorate(conn); | |
return conn; | |
} | |
} |