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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (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.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsIRDFDataSource.idl"
-
- interface nsISimpleEnumerator;
-
- /**
- * An nsIRDFCompositeDataSource composes individual data sources, providing
- * the illusion of a single, coherent RDF graph.
- */
- [scriptable, uuid(96343820-307C-11D2-BC15-00805F912FE7)]
- interface nsIRDFCompositeDataSource : nsIRDFDataSource {
-
- /**
- *
- * Set this value to <code>true</code> if the composite datasource
- * may contains at least one datasource that has <em>negative</em>
- * assertions. (This is the default.)
- *
- * Set this value to <code>false</code> if none of the datasources
- * being composed contains a negative assertion. This allows the
- * composite datasource to perform some query optimizations.
- *
- * By default, this value is <code>true</true>.
- */
- attribute boolean allowNegativeAssertions;
-
- /**
- * Set to <code>true</code> if the composite datasource should
- * take care to coalesce duplicate arcs when returning values from
- * queries. (This is the default.)
- *
- * Set to <code>false</code> if the composite datasource shouldn't
- * bother to check for duplicates. This allows the composite
- * datasource to more efficiently answer queries.
- *
- * By default, this value is <code>true</code>.
- */
- attribute boolean coalesceDuplicateArcs;
-
- /**
- * Add a datasource the the composite data source.
- * @param aDataSource the datasource to add to composite
- */
- void AddDataSource(in nsIRDFDataSource aDataSource);
-
- /**
- * Remove a datasource from the composite data source.
- * @param aDataSource the datasource to remove from the composite
- */
- void RemoveDataSource(in nsIRDFDataSource aDataSource);
-
- /**
- * Retrieve the datasources in the composite data source.
- * @return an nsISimpleEnumerator that will enumerate each
- * of the datasources in the composite
- */
- nsISimpleEnumerator GetDataSources();
- };
-
- %{C++
- extern nsresult
- NS_NewRDFCompositeDataSource(nsIRDFCompositeDataSource** result);
- %}
-
-