/* -*- 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 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#include "nsISupports.idl"
#include "nsIRDFDataSource.idl"
#include "nsIRDFResource.idl"
#include "nsIRDFNode.idl"
#include "nsIEnumerator.idl"

// A wrapper for manipulating RDF containers
[scriptable, uuid(D4214E90-FB94-11D2-BDD8-00104BDE6048)]
interface nsIRDFContainer : nsISupports {
    readonly attribute nsIRDFDataSource DataSource;
    readonly attribute nsIRDFResource   Resource;

    // Initialize the container wrapper to the specified resource
    // using the specified datasource for context.
    void Init(in nsIRDFDataSource aDataSource, in nsIRDFResource aContainer);

    // Return the number of elements in the container. Note that this
    // may not always be accurate due to aggregation.
    long GetCount();

    // Return an enumerator that can be used to enumerate the contents
    // of the container in ascending order.
    nsISimpleEnumerator GetElements();

    // Append an element to the container, assigning it the next
    // available ordinal.
    void AppendElement(in nsIRDFNode aElement);

    // Remove the first occurence of the specified element from the
    // container.
    void RemoveElement(in nsIRDFNode aElement, in boolean aRenumber);
    void InsertElementAt(in nsIRDFNode aElement, in long aIndex, in boolean aRenumber);
    long IndexOf(in nsIRDFNode aElement);
};

%{C++
PR_EXTERN(nsresult)
NS_NewRDFContainer(nsIRDFContainer** aResult);

PR_EXTERN(nsresult)
NS_NewRDFContainer(nsIRDFDataSource* aDataSource,
                   nsIRDFResource* aResource,
                   nsIRDFContainer** aResult);

/**
 * Create a cursor on a container that enumerates its contents in
 * order
 */
PR_EXTERN(nsresult)
NS_NewContainerEnumerator(nsIRDFDataSource* aDataSource,
                          nsIRDFResource* aContainer,
                          nsISimpleEnumerator** aResult);


%}