gecko-dev/rdf/base/idl/nsIRDFCompositeDataSource.idl

86 строки
2.8 KiB
Plaintext
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#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);
%}