mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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298 lines
8.9 KiB
C++
298 lines
8.9 KiB
C++
/* -*- 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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* Pierre Phaneuf <pp@ludusdesign.com>
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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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/*
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A simple cursor that enumerates the elements of an RDF container
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(RDF:Bag, RDF:Seq, or RDF:Alt).
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Caveats
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-------
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1. This uses an implementation-specific detail to determine the
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index of the last element in the container; specifically, the RDF
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utilities maintain a counter attribute on the container that
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holds the numeric value of the next value that is to be
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assigned. So, this cursor will bust if you use it with a bag that
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hasn't been created using the RDF utility routines.
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*/
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#include "nscore.h"
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#include "nsCOMPtr.h"
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#include "nsIRDFContainerUtils.h"
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#include "nsIRDFDataSource.h"
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#include "nsIRDFNode.h"
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#include "nsIRDFService.h"
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#include "nsIServiceManager.h"
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#include "nsRDFCID.h"
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#include "nsString.h"
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#include "nsXPIDLString.h"
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#include "prlog.h"
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#include "rdf.h"
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#include "rdfutil.h"
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////////////////////////////////////////////////////////////////////////
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static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
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static NS_DEFINE_CID(kRDFContainerUtilsCID, NS_RDFCONTAINERUTILS_CID);
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////////////////////////////////////////////////////////////////////////
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class ContainerEnumeratorImpl : public nsISimpleEnumerator {
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private:
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// pseudo-constants
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static nsrefcnt gRefCnt;
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static nsIRDFResource* kRDF_nextVal;
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static nsIRDFContainerUtils* gRDFC;
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nsCOMPtr<nsIRDFDataSource> mDataSource;
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nsCOMPtr<nsIRDFResource> mContainer;
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nsCOMPtr<nsIRDFResource> mOrdinalProperty;
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nsCOMPtr<nsISimpleEnumerator> mCurrent;
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nsCOMPtr<nsIRDFNode> mResult;
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PRInt32 mNextIndex;
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public:
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ContainerEnumeratorImpl(nsIRDFDataSource* ds, nsIRDFResource* container);
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virtual ~ContainerEnumeratorImpl();
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nsresult Init();
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NS_DECL_ISUPPORTS
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NS_DECL_NSISIMPLEENUMERATOR
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};
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nsrefcnt ContainerEnumeratorImpl::gRefCnt;
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nsIRDFResource* ContainerEnumeratorImpl::kRDF_nextVal;
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nsIRDFContainerUtils* ContainerEnumeratorImpl::gRDFC;
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ContainerEnumeratorImpl::ContainerEnumeratorImpl(nsIRDFDataSource* aDataSource,
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nsIRDFResource* aContainer)
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: mDataSource(aDataSource),
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mContainer(aContainer),
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mNextIndex(1)
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{
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}
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nsresult
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ContainerEnumeratorImpl::Init()
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{
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if (gRefCnt++ == 0) {
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nsresult rv;
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nsCOMPtr<nsIRDFService> rdf = do_GetService(kRDFServiceCID);
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NS_ASSERTION(rdf != nsnull, "unable to acquire resource manager");
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if (! rdf)
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return NS_ERROR_FAILURE;
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rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "nextVal"), &kRDF_nextVal);
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NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get resource");
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if (NS_FAILED(rv)) return rv;
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rv = CallGetService(kRDFContainerUtilsCID, &gRDFC);
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if (NS_FAILED(rv)) return rv;
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}
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return NS_OK;
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}
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ContainerEnumeratorImpl::~ContainerEnumeratorImpl()
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{
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if (--gRefCnt == 0) {
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NS_IF_RELEASE(kRDF_nextVal);
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NS_IF_RELEASE(gRDFC);
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}
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}
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NS_IMPL_ISUPPORTS1(ContainerEnumeratorImpl, nsISimpleEnumerator)
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NS_IMETHODIMP
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ContainerEnumeratorImpl::HasMoreElements(PRBool* aResult)
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{
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NS_PRECONDITION(aResult != nsnull, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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nsresult rv;
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// If we've already queued up a next value, then we know there are more elements.
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if (mResult) {
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*aResult = PR_TRUE;
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return NS_OK;
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}
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// Otherwise, we need to grovel
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// Figure out the upper bound so we'll know when we're done. Since it's
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// possible that we're targeting a composite datasource, we'll need to
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// "GetTargets()" and take the maximum value of "nextVal" to know the
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// upper bound.
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//
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// Remember that since nextVal is the next index that we'd assign
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// to an element in a container, it's *one more* than count of
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// elements in the container.
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PRInt32 max = 0;
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nsCOMPtr<nsISimpleEnumerator> targets;
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rv = mDataSource->GetTargets(mContainer, kRDF_nextVal, PR_TRUE, getter_AddRefs(targets));
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if (NS_FAILED(rv)) return rv;
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while (1) {
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PRBool hasmore;
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targets->HasMoreElements(&hasmore);
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if (! hasmore)
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break;
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nsCOMPtr<nsISupports> isupports;
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targets->GetNext(getter_AddRefs(isupports));
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nsCOMPtr<nsIRDFLiteral> nextValLiteral = do_QueryInterface(isupports);
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if (! nextValLiteral)
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continue;
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const PRUnichar *nextValStr;
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nextValLiteral->GetValueConst(&nextValStr);
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PRInt32 err;
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PRInt32 nextVal = nsAutoString(nextValStr).ToInteger(&err);
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if (nextVal > max)
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max = nextVal;
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}
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// Now pre-fetch our next value into mResult.
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while (mCurrent || mNextIndex < max) {
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// If mCurrent has been depleted, then conjure up a new one
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if (! mCurrent) {
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rv = gRDFC->IndexToOrdinalResource(mNextIndex, getter_AddRefs(mOrdinalProperty));
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if (NS_FAILED(rv)) return rv;
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rv = mDataSource->GetTargets(mContainer, mOrdinalProperty, PR_TRUE, getter_AddRefs(mCurrent));
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if (NS_FAILED(rv)) return rv;
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++mNextIndex;
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}
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if (mCurrent) {
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PRBool hasMore;
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rv = mCurrent->HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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// Is the current enumerator depleted? If so, iterate to
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// the next index.
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if (! hasMore) {
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mCurrent = nsnull;
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continue;
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}
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// "Peek" ahead and pull out the next target.
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nsCOMPtr<nsISupports> result;
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rv = mCurrent->GetNext(getter_AddRefs(result));
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if (NS_FAILED(rv)) return rv;
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mResult = do_QueryInterface(result, &rv);
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if (NS_FAILED(rv)) return rv;
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*aResult = PR_TRUE;
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return NS_OK;
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}
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}
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// If we get here, we ran out of elements. The cursor is empty.
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*aResult = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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ContainerEnumeratorImpl::GetNext(nsISupports** aResult)
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{
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nsresult rv;
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PRBool hasMore;
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rv = HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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if (! hasMore)
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return NS_ERROR_UNEXPECTED;
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NS_ADDREF(*aResult = mResult);
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mResult = nsnull;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////
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nsresult
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NS_NewContainerEnumerator(nsIRDFDataSource* aDataSource,
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nsIRDFResource* aContainer,
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nsISimpleEnumerator** aResult)
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{
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NS_PRECONDITION(aDataSource != nsnull, "null ptr");
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if (! aDataSource)
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return NS_ERROR_NULL_POINTER;
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NS_PRECONDITION(aContainer != nsnull, "null ptr");
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if (! aContainer)
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return NS_ERROR_NULL_POINTER;
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NS_PRECONDITION(aResult != nsnull, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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ContainerEnumeratorImpl* result = new ContainerEnumeratorImpl(aDataSource, aContainer);
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if (! result)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(result);
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nsresult rv = result->Init();
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if (NS_FAILED(rv))
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NS_RELEASE(result);
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*aResult = result;
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return rv;
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}
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