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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 "nsISupports.idl"
- #include "nsIRDFResource.idl"
- #include "nsIRDFLiteral.idl"
- #include "nsIRDFDataSource.idl"
-
-
- // The RDF service interface. This is a singleton object, and should be
- // obtained from the <tt>nsServiceManager</tt>.
- [scriptable, uuid(BFD05261-834C-11d2-8EAC-00805F29F370)]
- interface nsIRDFService : nsISupports {
- // Construct an RDF resource from a single-byte URI. <tt>nsIRDFSerivce</tt>
- // caches resources that are in-use, so multiple calls to <tt>GetResource()</tt>
- // for the same <tt>uri</tt> will return identical pointers. FindResource
- // is used to find out whether there already exists a resource corresponding to that url.
- nsIRDFResource GetResource(in AUTF8String aURI);
-
- // Construct an RDF resource from a Unicode URI. This is provided
- // as a convenience method, allowing automatic, in-line C++
- // conversion from <tt>nsString</tt> objects. The <tt>uri</tt> will
- // be converted to a single-byte representation internally.
- nsIRDFResource GetUnicodeResource(in AString aURI);
-
- nsIRDFResource GetAnonymousResource();
-
- // Construct an RDF literal from a Unicode string.
- nsIRDFLiteral GetLiteral(in wstring aValue);
-
- // Construct an RDF literal from a PRTime.
- nsIRDFDate GetDateLiteral(in long long aValue);
-
- // Construct an RDF literal from an int.
- nsIRDFInt GetIntLiteral(in long aValue);
-
- // Construct an RDF literal from a data blob
- [noscript] nsIRDFBlob getBlobLiteral(in const_octet_ptr aValue, in long aLength);
-
- boolean IsAnonymousResource(in nsIRDFResource aResource);
-
- // Registers a resource with the RDF system, making it unique w.r.t.
- // GetResource.
- //
- // An implementation of nsIRDFResource should call this in its
- // Init() method if it wishes the resource to be globally unique
- // (which is usually the case).
- //
- // NOTE that the resource will <i>not</i> be ref-counted by the
- // RDF service: the assumption is that the resource implementation
- // will call nsIRDFService::UnregisterResource() when the last
- // reference to the resource is released.
- //
- // NOTE that the nsIRDFService implementation may choose to
- // maintain a reference to the resource's URI; therefore, the
- // resource implementation should ensure that the resource's URI
- // (accessable via nsIRDFResource::GetValue(const char* *aURI)) is
- // valid before calling RegisterResource(). Furthermore, the
- // resource implementation should ensure that this pointer
- // <i>remains</i> valid for the lifetime of the resource. (The
- // implementation of the resource cache in nsIRDFService uses the
- // URI maintained "internally" in the resource as a key into the
- // cache rather than copying the resource URI itself.)
- void RegisterResource(in nsIRDFResource aResource, in boolean aReplace);
-
- // Called to notify the resource manager that a resource is no
- // longer in use. This method should only be called from the
- // destructor of a "custom" resource implementation to notify the
- // RDF service that the last reference to the resource has been
- // released, so the resource is no longer valid.
- //
- // NOTE. As mentioned in nsIRDFResourceFactory::CreateResource(),
- // the RDF service will use the result of
- // nsIRDFResource::GetValue() as a key into its cache. For this
- // reason, you must always un-cache the resource <b>before</b>
- // releasing the storage for the <tt>const char*</tt> URI.
- void UnregisterResource(in nsIRDFResource aResource);
-
- // Register a <i>named data source</i>. The RDF service will call
- // <tt>nsIRDFDataSource::GetURI()</tt> to determine the URI under
- // which to register the data source.
- //
- // Note that the data source will <i>not</i> be refcounted by the
- // RDF service! The assumption is that an RDF data source
- // registers with the service once it is initialized (via
- // <tt>nsIRDFDataSource::Init()</tt>), and unregisters when the
- // last reference to the data source is released.
- void RegisterDataSource(in nsIRDFDataSource aDataSource,
- in boolean aReplace);
-
- // Unregister a <i>named data source</i>. The RDF service will call
- // <tt>nsIRDFDataSource::GetURI()</tt> to determine the URI under which the
- // data source was registered.
- void UnregisterDataSource(in nsIRDFDataSource aDataSource);
-
- // Get the <i>named data source</i> corresponding to the URI. If a data
- // source has been registered via <tt>RegisterDataSource()</tt>, that
- // data source will be returned.
- //
- // If no data source is currently
- // registered for the specified URI, and a data source <i>constructor</i>
- // function has been registered via <tt>RegisterDatasourceConstructor()</tt>,
- // the RDF service will call the constructor to attempt to construct a
- // new data source. If construction is successful, the data source will
- // be initialized via <tt>nsIRDFDataSource::Init()</tt>.
- nsIRDFDataSource GetDataSource(in string aURI);
-
- // Same as GetDataSource, but if a remote/XML data source needs to be
- // constructed, then this method will issue a <b>blocking</b> Refresh
- // call on that data source.
- nsIRDFDataSource GetDataSourceBlocking(in string aURI);
- };
-
- %{C++
- extern nsresult
- NS_NewRDFService(nsIRDFService** result);
- %}
-
-