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101 строка
3.7 KiB
Plaintext
101 строка
3.7 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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