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86 lines
2.8 KiB
Plaintext
86 lines
2.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsIRDFDataSource.idl"
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interface nsISimpleEnumerator;
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/**
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* An nsIRDFCompositeDataSource composes individual data sources, providing
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* the illusion of a single, coherent RDF graph.
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*/
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[scriptable, uuid(96343820-307C-11D2-BC15-00805F912FE7)]
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interface nsIRDFCompositeDataSource : nsIRDFDataSource {
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/**
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*
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* Set this value to <code>true</code> if the composite datasource
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* may contains at least one datasource that has <em>negative</em>
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* assertions. (This is the default.)
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*
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* Set this value to <code>false</code> if none of the datasources
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* being composed contains a negative assertion. This allows the
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* composite datasource to perform some query optimizations.
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*
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* By default, this value is <code>true</true>.
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*/
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attribute boolean allowNegativeAssertions;
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/**
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* Set to <code>true</code> if the composite datasource should
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* take care to coalesce duplicate arcs when returning values from
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* queries. (This is the default.)
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*
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* Set to <code>false</code> if the composite datasource shouldn't
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* bother to check for duplicates. This allows the composite
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* datasource to more efficiently answer queries.
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*
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* By default, this value is <code>true</code>.
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*/
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attribute boolean coalesceDuplicateArcs;
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/**
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* Add a datasource the the composite data source.
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* @param aDataSource the datasource to add to composite
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*/
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void AddDataSource(in nsIRDFDataSource aDataSource);
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/**
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* Remove a datasource from the composite data source.
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* @param aDataSource the datasource to remove from the composite
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*/
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void RemoveDataSource(in nsIRDFDataSource aDataSource);
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/**
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* Retrieve the datasources in the composite data source.
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* @return an nsISimpleEnumerator that will enumerate each
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* of the datasources in the composite
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*/
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nsISimpleEnumerator GetDataSources();
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};
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%{C++
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extern nsresult
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NS_NewRDFCompositeDataSource(nsIRDFCompositeDataSource** result);
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%}
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