/*
* #!
* Ontopia DB2TM
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* 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.ontopia.topicmaps.db2tm;
import java.util.Collection;
/**
* INTERNAL: A data source interface. This interface is used to
* represent a data source that is capable of returning a stream of
* tuples for a limited number of relations.
*/
public interface DataSourceIF {
/**
* INTERNAL: Returns the relations that the data source knows
* of. The collection return contains Relation instances.
*/
public Collection<Relation> getRelations();
/**
* INTERNAL: Returns a tuple reader for the given relation.
*/
public TupleReaderIF getReader(String relation);
/**
* INTERNAL: Returns a changelog reader.
*/
public ChangelogReaderIF getChangelogReader(Changelog changelog, String startOrder);
/**
* INTERNAL: Returns the maximum value of the order column for the
* specified changelog.
*/
public String getMaxOrderValue(Changelog changelog);
/**
* INTERNAL: Closes the data source so that it can release any open
* resources.
*/
public void close();
}