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69 lines
2.3 KiB
Plaintext
69 lines
2.3 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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