1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rdf/base/src/nsRDFXMLDataSource.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,1188 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/*
1.10 +
1.11 + A data source that can read itself from and write itself to an
1.12 + RDF/XML stream.
1.13 +
1.14 + For more information on the RDF/XML syntax,
1.15 + see http://www.w3.org/TR/REC-rdf-syntax/.
1.16 +
1.17 + This code is based on the final W3C Recommendation,
1.18 + http://www.w3.org/TR/1999/REC-rdf-syntax-19990222.
1.19 +
1.20 +
1.21 + TO DO
1.22 + -----
1.23 +
1.24 + 1) Right now, the only kind of stream data sources that are _really_
1.25 + writable are "file:" URIs. (In fact, _all_ "file:" URIs are
1.26 + writable, modulo file system permissions; this may lead to some
1.27 + surprising behavior.) Eventually, it'd be great if we could open
1.28 + an arbitrary nsIOutputStream on *any* URL, and Netlib could just
1.29 + do the magic.
1.30 +
1.31 + 2) Implement a more terse output for "typed" nodes; that is, instead
1.32 + of "RDF:Description type='ns:foo'", just output "ns:foo".
1.33 +
1.34 + 3) When re-serializing, we "cheat" for Descriptions that talk about
1.35 + inline resources (i.e.., using the `ID' attribute specified in
1.36 + [6.21]). Instead of writing an `ID="foo"' for the first instance,
1.37 + and then `about="#foo"' for each subsequent instance, we just
1.38 + _always_ write `about="#foo"'.
1.39 +
1.40 + We do this so that we can handle the case where an RDF container
1.41 + has been assigned arbitrary properties: the spec says we can't
1.42 + dangle the attributes directly off the container, so we need to
1.43 + refer to it. Of course, with a little cleverness, we could fix
1.44 + this. But who cares?
1.45 +
1.46 + 4) When re-serializing containers. We have to cheat on some
1.47 + containers, and use an illegal "about=" construct. We do this to
1.48 + handle containers that have been assigned URIs outside of the
1.49 + local document.
1.50 +
1.51 +
1.52 + Logging
1.53 + -------
1.54 +
1.55 + To turn on logging for this module, set
1.56 +
1.57 + NSPR_LOG_MODULES=nsRDFXMLDataSource:5
1.58 +
1.59 + */
1.60 +
1.61 +#include "nsIFileStreams.h"
1.62 +#include "nsIOutputStream.h"
1.63 +#include "nsIFile.h"
1.64 +#include "nsIFileChannel.h"
1.65 +#include "nsIDTD.h"
1.66 +#include "nsIRDFPurgeableDataSource.h"
1.67 +#include "nsIInputStream.h"
1.68 +#include "nsIOutputStream.h"
1.69 +#include "nsIRDFContainerUtils.h"
1.70 +#include "nsIRDFNode.h"
1.71 +#include "nsIRDFRemoteDataSource.h"
1.72 +#include "nsIRDFService.h"
1.73 +#include "nsIRDFXMLParser.h"
1.74 +#include "nsIRDFXMLSerializer.h"
1.75 +#include "nsIRDFXMLSink.h"
1.76 +#include "nsIRDFXMLSource.h"
1.77 +#include "nsIServiceManager.h"
1.78 +#include "nsIStreamListener.h"
1.79 +#include "nsIURL.h"
1.80 +#include "nsIFileURL.h"
1.81 +#include "nsNetUtil.h"
1.82 +#include "nsIChannel.h"
1.83 +#include "nsRDFCID.h"
1.84 +#include "nsRDFBaseDataSources.h"
1.85 +#include "nsCOMArray.h"
1.86 +#include "nsXPIDLString.h"
1.87 +#include "plstr.h"
1.88 +#include "prio.h"
1.89 +#include "prthread.h"
1.90 +#include "rdf.h"
1.91 +#include "rdfutil.h"
1.92 +#include "prlog.h"
1.93 +#include "nsNameSpaceMap.h"
1.94 +#include "nsCRT.h"
1.95 +#include "nsCycleCollectionParticipant.h"
1.96 +#include "nsIScriptSecurityManager.h"
1.97 +#include "nsIChannelEventSink.h"
1.98 +#include "nsIAsyncVerifyRedirectCallback.h"
1.99 +#include "nsNetUtil.h"
1.100 +
1.101 +#include "rdfIDataSource.h"
1.102 +
1.103 +//----------------------------------------------------------------------
1.104 +//
1.105 +// RDFXMLDataSourceImpl
1.106 +//
1.107 +
1.108 +class RDFXMLDataSourceImpl : public nsIRDFDataSource,
1.109 + public nsIRDFRemoteDataSource,
1.110 + public nsIRDFXMLSink,
1.111 + public nsIRDFXMLSource,
1.112 + public nsIStreamListener,
1.113 + public rdfIDataSource,
1.114 + public nsIInterfaceRequestor,
1.115 + public nsIChannelEventSink
1.116 +{
1.117 +protected:
1.118 + enum LoadState {
1.119 + eLoadState_Unloaded,
1.120 + eLoadState_Pending,
1.121 + eLoadState_Loading,
1.122 + eLoadState_Loaded
1.123 + };
1.124 +
1.125 + nsCOMPtr<nsIRDFDataSource> mInner;
1.126 + bool mIsWritable; // true if the document can be written back
1.127 + bool mIsDirty; // true if the document should be written back
1.128 + LoadState mLoadState; // what we're doing now
1.129 + nsCOMArray<nsIRDFXMLSinkObserver> mObservers;
1.130 + nsCOMPtr<nsIURI> mURL;
1.131 + nsCOMPtr<nsIStreamListener> mListener;
1.132 + nsNameSpaceMap mNameSpaces;
1.133 +
1.134 + // pseudo-constants
1.135 + static int32_t gRefCnt;
1.136 + static nsIRDFService* gRDFService;
1.137 +
1.138 +#ifdef PR_LOGGING
1.139 + static PRLogModuleInfo* gLog;
1.140 +#endif
1.141 +
1.142 + nsresult Init();
1.143 + RDFXMLDataSourceImpl(void);
1.144 + virtual ~RDFXMLDataSourceImpl(void);
1.145 + nsresult rdfXMLFlush(nsIURI *aURI);
1.146 +
1.147 + friend nsresult
1.148 + NS_NewRDFXMLDataSource(nsIRDFDataSource** aResult);
1.149 +
1.150 + inline bool IsLoading() {
1.151 + return (mLoadState == eLoadState_Pending) ||
1.152 + (mLoadState == eLoadState_Loading);
1.153 + }
1.154 +
1.155 +public:
1.156 + // nsISupports
1.157 + NS_DECL_CYCLE_COLLECTING_ISUPPORTS
1.158 + NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(RDFXMLDataSourceImpl,
1.159 + nsIRDFDataSource)
1.160 +
1.161 + // nsIRDFDataSource
1.162 + NS_IMETHOD GetURI(char* *uri);
1.163 +
1.164 + NS_IMETHOD GetSource(nsIRDFResource* property,
1.165 + nsIRDFNode* target,
1.166 + bool tv,
1.167 + nsIRDFResource** source) {
1.168 + return mInner->GetSource(property, target, tv, source);
1.169 + }
1.170 +
1.171 + NS_IMETHOD GetSources(nsIRDFResource* property,
1.172 + nsIRDFNode* target,
1.173 + bool tv,
1.174 + nsISimpleEnumerator** sources) {
1.175 + return mInner->GetSources(property, target, tv, sources);
1.176 + }
1.177 +
1.178 + NS_IMETHOD GetTarget(nsIRDFResource* source,
1.179 + nsIRDFResource* property,
1.180 + bool tv,
1.181 + nsIRDFNode** target) {
1.182 + return mInner->GetTarget(source, property, tv, target);
1.183 + }
1.184 +
1.185 + NS_IMETHOD GetTargets(nsIRDFResource* source,
1.186 + nsIRDFResource* property,
1.187 + bool tv,
1.188 + nsISimpleEnumerator** targets) {
1.189 + return mInner->GetTargets(source, property, tv, targets);
1.190 + }
1.191 +
1.192 + NS_IMETHOD Assert(nsIRDFResource* aSource,
1.193 + nsIRDFResource* aProperty,
1.194 + nsIRDFNode* aTarget,
1.195 + bool tv);
1.196 +
1.197 + NS_IMETHOD Unassert(nsIRDFResource* source,
1.198 + nsIRDFResource* property,
1.199 + nsIRDFNode* target);
1.200 +
1.201 + NS_IMETHOD Change(nsIRDFResource* aSource,
1.202 + nsIRDFResource* aProperty,
1.203 + nsIRDFNode* aOldTarget,
1.204 + nsIRDFNode* aNewTarget);
1.205 +
1.206 + NS_IMETHOD Move(nsIRDFResource* aOldSource,
1.207 + nsIRDFResource* aNewSource,
1.208 + nsIRDFResource* aProperty,
1.209 + nsIRDFNode* aTarget);
1.210 +
1.211 + NS_IMETHOD HasAssertion(nsIRDFResource* source,
1.212 + nsIRDFResource* property,
1.213 + nsIRDFNode* target,
1.214 + bool tv,
1.215 + bool* hasAssertion) {
1.216 + return mInner->HasAssertion(source, property, target, tv, hasAssertion);
1.217 + }
1.218 +
1.219 + NS_IMETHOD AddObserver(nsIRDFObserver* aObserver) {
1.220 + return mInner->AddObserver(aObserver);
1.221 + }
1.222 +
1.223 + NS_IMETHOD RemoveObserver(nsIRDFObserver* aObserver) {
1.224 + return mInner->RemoveObserver(aObserver);
1.225 + }
1.226 +
1.227 + NS_IMETHOD HasArcIn(nsIRDFNode *aNode, nsIRDFResource *aArc, bool *_retval) {
1.228 + return mInner->HasArcIn(aNode, aArc, _retval);
1.229 + }
1.230 +
1.231 + NS_IMETHOD HasArcOut(nsIRDFResource *aSource, nsIRDFResource *aArc, bool *_retval) {
1.232 + return mInner->HasArcOut(aSource, aArc, _retval);
1.233 + }
1.234 +
1.235 + NS_IMETHOD ArcLabelsIn(nsIRDFNode* node,
1.236 + nsISimpleEnumerator** labels) {
1.237 + return mInner->ArcLabelsIn(node, labels);
1.238 + }
1.239 +
1.240 + NS_IMETHOD ArcLabelsOut(nsIRDFResource* source,
1.241 + nsISimpleEnumerator** labels) {
1.242 + return mInner->ArcLabelsOut(source, labels);
1.243 + }
1.244 +
1.245 + NS_IMETHOD GetAllResources(nsISimpleEnumerator** aResult) {
1.246 + return mInner->GetAllResources(aResult);
1.247 + }
1.248 +
1.249 + NS_IMETHOD GetAllCmds(nsIRDFResource* source,
1.250 + nsISimpleEnumerator/*<nsIRDFResource>*/** commands) {
1.251 + return mInner->GetAllCmds(source, commands);
1.252 + }
1.253 +
1.254 + NS_IMETHOD IsCommandEnabled(nsISupportsArray/*<nsIRDFResource>*/* aSources,
1.255 + nsIRDFResource* aCommand,
1.256 + nsISupportsArray/*<nsIRDFResource>*/* aArguments,
1.257 + bool* aResult) {
1.258 + return mInner->IsCommandEnabled(aSources, aCommand, aArguments, aResult);
1.259 + }
1.260 +
1.261 + NS_IMETHOD DoCommand(nsISupportsArray/*<nsIRDFResource>*/* aSources,
1.262 + nsIRDFResource* aCommand,
1.263 + nsISupportsArray/*<nsIRDFResource>*/* aArguments) {
1.264 + // XXX Uh oh, this could cause problems wrt. the "dirty" flag
1.265 + // if it changes the in-memory store's internal state.
1.266 + return mInner->DoCommand(aSources, aCommand, aArguments);
1.267 + }
1.268 +
1.269 + NS_IMETHOD BeginUpdateBatch() {
1.270 + return mInner->BeginUpdateBatch();
1.271 + }
1.272 +
1.273 + NS_IMETHOD EndUpdateBatch() {
1.274 + return mInner->EndUpdateBatch();
1.275 + }
1.276 +
1.277 + // nsIRDFRemoteDataSource interface
1.278 + NS_DECL_NSIRDFREMOTEDATASOURCE
1.279 +
1.280 + // nsIRDFXMLSink interface
1.281 + NS_DECL_NSIRDFXMLSINK
1.282 +
1.283 + // nsIRDFXMLSource interface
1.284 + NS_DECL_NSIRDFXMLSOURCE
1.285 +
1.286 + // nsIRequestObserver
1.287 + NS_DECL_NSIREQUESTOBSERVER
1.288 +
1.289 + // nsIStreamListener
1.290 + NS_DECL_NSISTREAMLISTENER
1.291 +
1.292 + // nsIInterfaceRequestor
1.293 + NS_DECL_NSIINTERFACEREQUESTOR
1.294 +
1.295 + // nsIChannelEventSink
1.296 + NS_DECL_NSICHANNELEVENTSINK
1.297 +
1.298 + // rdfIDataSource
1.299 + NS_IMETHOD VisitAllSubjects(rdfITripleVisitor *aVisitor) {
1.300 + nsresult rv;
1.301 + nsCOMPtr<rdfIDataSource> rdfds = do_QueryInterface(mInner, &rv);
1.302 + if (NS_FAILED(rv)) return rv;
1.303 + return rdfds->VisitAllSubjects(aVisitor);
1.304 + }
1.305 +
1.306 + NS_IMETHOD VisitAllTriples(rdfITripleVisitor *aVisitor) {
1.307 + nsresult rv;
1.308 + nsCOMPtr<rdfIDataSource> rdfds = do_QueryInterface(mInner, &rv);
1.309 + if (NS_FAILED(rv)) return rv;
1.310 + return rdfds->VisitAllTriples(aVisitor);
1.311 + }
1.312 +
1.313 + // Implementation methods
1.314 + bool
1.315 + MakeQName(nsIRDFResource* aResource,
1.316 + nsString& property,
1.317 + nsString& nameSpacePrefix,
1.318 + nsString& nameSpaceURI);
1.319 +
1.320 + nsresult
1.321 + SerializeAssertion(nsIOutputStream* aStream,
1.322 + nsIRDFResource* aResource,
1.323 + nsIRDFResource* aProperty,
1.324 + nsIRDFNode* aValue);
1.325 +
1.326 + nsresult
1.327 + SerializeProperty(nsIOutputStream* aStream,
1.328 + nsIRDFResource* aResource,
1.329 + nsIRDFResource* aProperty);
1.330 +
1.331 + bool
1.332 + IsContainerProperty(nsIRDFResource* aProperty);
1.333 +
1.334 + nsresult
1.335 + SerializeDescription(nsIOutputStream* aStream,
1.336 + nsIRDFResource* aResource);
1.337 +
1.338 + nsresult
1.339 + SerializeMember(nsIOutputStream* aStream,
1.340 + nsIRDFResource* aContainer,
1.341 + nsIRDFNode* aMember);
1.342 +
1.343 + nsresult
1.344 + SerializeContainer(nsIOutputStream* aStream,
1.345 + nsIRDFResource* aContainer);
1.346 +
1.347 + nsresult
1.348 + SerializePrologue(nsIOutputStream* aStream);
1.349 +
1.350 + nsresult
1.351 + SerializeEpilogue(nsIOutputStream* aStream);
1.352 +
1.353 + bool
1.354 + IsA(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType);
1.355 +
1.356 +protected:
1.357 + nsresult
1.358 + BlockingParse(nsIURI* aURL, nsIStreamListener* aConsumer);
1.359 +};
1.360 +
1.361 +int32_t RDFXMLDataSourceImpl::gRefCnt = 0;
1.362 +nsIRDFService* RDFXMLDataSourceImpl::gRDFService;
1.363 +
1.364 +#ifdef PR_LOGGING
1.365 +PRLogModuleInfo* RDFXMLDataSourceImpl::gLog;
1.366 +#endif
1.367 +
1.368 +static const char kFileURIPrefix[] = "file:";
1.369 +static const char kResourceURIPrefix[] = "resource:";
1.370 +
1.371 +
1.372 +//----------------------------------------------------------------------
1.373 +
1.374 +nsresult
1.375 +NS_NewRDFXMLDataSource(nsIRDFDataSource** aResult)
1.376 +{
1.377 + NS_PRECONDITION(aResult != nullptr, "null ptr");
1.378 + if (! aResult)
1.379 + return NS_ERROR_NULL_POINTER;
1.380 +
1.381 + RDFXMLDataSourceImpl* datasource = new RDFXMLDataSourceImpl();
1.382 + if (! datasource)
1.383 + return NS_ERROR_OUT_OF_MEMORY;
1.384 +
1.385 + nsresult rv;
1.386 + rv = datasource->Init();
1.387 +
1.388 + if (NS_FAILED(rv)) {
1.389 + delete datasource;
1.390 + return rv;
1.391 + }
1.392 +
1.393 + NS_ADDREF(datasource);
1.394 + *aResult = datasource;
1.395 + return NS_OK;
1.396 +}
1.397 +
1.398 +
1.399 +RDFXMLDataSourceImpl::RDFXMLDataSourceImpl(void)
1.400 + : mIsWritable(true),
1.401 + mIsDirty(false),
1.402 + mLoadState(eLoadState_Unloaded)
1.403 +{
1.404 +#ifdef PR_LOGGING
1.405 + if (! gLog)
1.406 + gLog = PR_NewLogModule("nsRDFXMLDataSource");
1.407 +#endif
1.408 +}
1.409 +
1.410 +
1.411 +nsresult
1.412 +RDFXMLDataSourceImpl::Init()
1.413 +{
1.414 + nsresult rv;
1.415 + NS_DEFINE_CID(kRDFInMemoryDataSourceCID, NS_RDFINMEMORYDATASOURCE_CID);
1.416 + mInner = do_CreateInstance(kRDFInMemoryDataSourceCID, &rv);
1.417 + if (NS_FAILED(rv)) return rv;
1.418 +
1.419 + if (gRefCnt++ == 0) {
1.420 + NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
1.421 + rv = CallGetService(kRDFServiceCID, &gRDFService);
1.422 +
1.423 + NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get RDF service");
1.424 + if (NS_FAILED(rv)) return rv;
1.425 + }
1.426 +
1.427 + return NS_OK;
1.428 +}
1.429 +
1.430 +
1.431 +RDFXMLDataSourceImpl::~RDFXMLDataSourceImpl(void)
1.432 +{
1.433 + // Unregister first so that nobody else tries to get us.
1.434 + (void) gRDFService->UnregisterDataSource(this);
1.435 +
1.436 + // Now flush contents
1.437 + (void) Flush();
1.438 +
1.439 + // Release RDF/XML sink observers
1.440 + mObservers.Clear();
1.441 +
1.442 + if (--gRefCnt == 0)
1.443 + NS_IF_RELEASE(gRDFService);
1.444 +}
1.445 +
1.446 +NS_IMPL_CYCLE_COLLECTION_CLASS(RDFXMLDataSourceImpl)
1.447 +
1.448 +NS_IMPL_CYCLE_COLLECTION_UNLINK_0(RDFXMLDataSourceImpl)
1.449 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(RDFXMLDataSourceImpl)
1.450 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInner)
1.451 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
1.452 +
1.453 +NS_IMPL_CYCLE_COLLECTING_ADDREF(RDFXMLDataSourceImpl)
1.454 +NS_IMPL_CYCLE_COLLECTING_RELEASE(RDFXMLDataSourceImpl)
1.455 +
1.456 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(RDFXMLDataSourceImpl)
1.457 + NS_INTERFACE_MAP_ENTRY(nsIRDFDataSource)
1.458 + NS_INTERFACE_MAP_ENTRY(nsIRDFRemoteDataSource)
1.459 + NS_INTERFACE_MAP_ENTRY(nsIRDFXMLSink)
1.460 + NS_INTERFACE_MAP_ENTRY(nsIRDFXMLSource)
1.461 + NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
1.462 + NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
1.463 + NS_INTERFACE_MAP_ENTRY(rdfIDataSource)
1.464 + NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
1.465 + NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink)
1.466 + NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIRDFDataSource)
1.467 +NS_INTERFACE_MAP_END
1.468 +
1.469 +// nsIInterfaceRequestor
1.470 +NS_IMETHODIMP
1.471 +RDFXMLDataSourceImpl::GetInterface(const nsIID& aIID, void** aSink)
1.472 +{
1.473 + return QueryInterface(aIID, aSink);
1.474 +}
1.475 +
1.476 +nsresult
1.477 +RDFXMLDataSourceImpl::BlockingParse(nsIURI* aURL, nsIStreamListener* aConsumer)
1.478 +{
1.479 + nsresult rv;
1.480 +
1.481 + // XXX I really hate the way that we're spoon-feeding this stuff
1.482 + // to the parser: it seems like this is something that netlib
1.483 + // should be able to do by itself.
1.484 +
1.485 + nsCOMPtr<nsIChannel> channel;
1.486 + nsCOMPtr<nsIRequest> request;
1.487 +
1.488 + // Null LoadGroup ?
1.489 + rv = NS_NewChannel(getter_AddRefs(channel), aURL, nullptr);
1.490 + if (NS_FAILED(rv)) return rv;
1.491 + nsCOMPtr<nsIInputStream> in;
1.492 + rv = channel->Open(getter_AddRefs(in));
1.493 +
1.494 + // Report success if the file doesn't exist, but propagate other errors.
1.495 + if (rv == NS_ERROR_FILE_NOT_FOUND) return NS_OK;
1.496 + if (NS_FAILED(rv)) return rv;
1.497 +
1.498 + if (! in) {
1.499 + NS_ERROR("no input stream");
1.500 + return NS_ERROR_FAILURE;
1.501 + }
1.502 +
1.503 + // Wrap the channel's input stream in a buffered stream to ensure that
1.504 + // ReadSegments is implemented (which OnDataAvailable expects).
1.505 + nsCOMPtr<nsIInputStream> bufStream;
1.506 + rv = NS_NewBufferedInputStream(getter_AddRefs(bufStream), in,
1.507 + 4096 /* buffer size */);
1.508 + if (NS_FAILED(rv)) return rv;
1.509 +
1.510 + // Notify load observers
1.511 + int32_t i;
1.512 + for (i = mObservers.Count() - 1; i >= 0; --i) {
1.513 + // Make sure to hold a strong reference to the observer so
1.514 + // that it doesn't go away in this call if it removes itself
1.515 + // as an observer
1.516 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.517 +
1.518 + if (obs) {
1.519 + obs->OnBeginLoad(this);
1.520 + }
1.521 + }
1.522 +
1.523 + rv = aConsumer->OnStartRequest(channel, nullptr);
1.524 +
1.525 + uint64_t offset = 0;
1.526 + while (NS_SUCCEEDED(rv)) {
1.527 + // Skip ODA if the channel is canceled
1.528 + channel->GetStatus(&rv);
1.529 + if (NS_FAILED(rv))
1.530 + break;
1.531 +
1.532 + uint64_t avail;
1.533 + if (NS_FAILED(rv = bufStream->Available(&avail)))
1.534 + break; // error
1.535 +
1.536 + if (avail == 0)
1.537 + break; // eof
1.538 +
1.539 + if (avail > UINT32_MAX)
1.540 + avail = UINT32_MAX;
1.541 +
1.542 + rv = aConsumer->OnDataAvailable(channel, nullptr, bufStream, offset, (uint32_t)avail);
1.543 + if (NS_SUCCEEDED(rv))
1.544 + offset += avail;
1.545 + }
1.546 +
1.547 + if (NS_FAILED(rv))
1.548 + channel->Cancel(rv);
1.549 +
1.550 + channel->GetStatus(&rv);
1.551 + aConsumer->OnStopRequest(channel, nullptr, rv);
1.552 +
1.553 + // Notify load observers
1.554 + for (i = mObservers.Count() - 1; i >= 0; --i) {
1.555 + // Make sure to hold a strong reference to the observer so
1.556 + // that it doesn't go away in this call if it removes itself
1.557 + // as an observer
1.558 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.559 +
1.560 + if (obs) {
1.561 + if (NS_FAILED(rv))
1.562 + obs->OnError(this, rv, nullptr);
1.563 +
1.564 + obs->OnEndLoad(this);
1.565 + }
1.566 + }
1.567 +
1.568 + return rv;
1.569 +}
1.570 +
1.571 +NS_IMETHODIMP
1.572 +RDFXMLDataSourceImpl::GetLoaded(bool* _result)
1.573 +{
1.574 + *_result = (mLoadState == eLoadState_Loaded);
1.575 + return NS_OK;
1.576 +}
1.577 +
1.578 +NS_IMETHODIMP
1.579 +RDFXMLDataSourceImpl::Init(const char* uri)
1.580 +{
1.581 + NS_PRECONDITION(mInner != nullptr, "not initialized");
1.582 + if (! mInner)
1.583 + return NS_ERROR_OUT_OF_MEMORY;
1.584 +
1.585 + nsresult rv;
1.586 +
1.587 + rv = NS_NewURI(getter_AddRefs(mURL), nsDependentCString(uri));
1.588 + if (NS_FAILED(rv)) return rv;
1.589 +
1.590 + // XXX this is a hack: any "file:" URI is considered writable. All
1.591 + // others are considered read-only.
1.592 + if ((PL_strncmp(uri, kFileURIPrefix, sizeof(kFileURIPrefix) - 1) != 0) &&
1.593 + (PL_strncmp(uri, kResourceURIPrefix, sizeof(kResourceURIPrefix) - 1) != 0)) {
1.594 + mIsWritable = false;
1.595 + }
1.596 +
1.597 + rv = gRDFService->RegisterDataSource(this, false);
1.598 + if (NS_FAILED(rv)) return rv;
1.599 +
1.600 + return NS_OK;
1.601 +}
1.602 +
1.603 +
1.604 +NS_IMETHODIMP
1.605 +RDFXMLDataSourceImpl::GetURI(char* *aURI)
1.606 +{
1.607 + *aURI = nullptr;
1.608 + if (!mURL) {
1.609 + return NS_OK;
1.610 + }
1.611 +
1.612 + nsAutoCString spec;
1.613 + mURL->GetSpec(spec);
1.614 + *aURI = ToNewCString(spec);
1.615 + if (!*aURI) {
1.616 + return NS_ERROR_OUT_OF_MEMORY;
1.617 + }
1.618 +
1.619 + return NS_OK;
1.620 +}
1.621 +
1.622 +NS_IMETHODIMP
1.623 +RDFXMLDataSourceImpl::Assert(nsIRDFResource* aSource,
1.624 + nsIRDFResource* aProperty,
1.625 + nsIRDFNode* aTarget,
1.626 + bool aTruthValue)
1.627 +{
1.628 + // We don't accept assertions unless we're writable (except in the
1.629 + // case that we're actually _reading_ the datasource in).
1.630 + nsresult rv;
1.631 +
1.632 + if (IsLoading()) {
1.633 + bool hasAssertion = false;
1.634 +
1.635 + nsCOMPtr<nsIRDFPurgeableDataSource> gcable = do_QueryInterface(mInner);
1.636 + if (gcable) {
1.637 + rv = gcable->Mark(aSource, aProperty, aTarget, aTruthValue, &hasAssertion);
1.638 + if (NS_FAILED(rv)) return rv;
1.639 + }
1.640 +
1.641 + rv = NS_RDF_ASSERTION_ACCEPTED;
1.642 +
1.643 + if (! hasAssertion) {
1.644 + rv = mInner->Assert(aSource, aProperty, aTarget, aTruthValue);
1.645 +
1.646 + if (NS_SUCCEEDED(rv) && gcable) {
1.647 + // Now mark the new assertion, so it doesn't get
1.648 + // removed when we sweep. Ignore rv, because we want
1.649 + // to return what mInner->Assert() gave us.
1.650 + bool didMark;
1.651 + (void) gcable->Mark(aSource, aProperty, aTarget, aTruthValue, &didMark);
1.652 + }
1.653 +
1.654 + if (NS_FAILED(rv)) return rv;
1.655 + }
1.656 +
1.657 + return rv;
1.658 + }
1.659 + else if (mIsWritable) {
1.660 + rv = mInner->Assert(aSource, aProperty, aTarget, aTruthValue);
1.661 +
1.662 + if (rv == NS_RDF_ASSERTION_ACCEPTED)
1.663 + mIsDirty = true;
1.664 +
1.665 + return rv;
1.666 + }
1.667 + else {
1.668 + return NS_RDF_ASSERTION_REJECTED;
1.669 + }
1.670 +}
1.671 +
1.672 +
1.673 +NS_IMETHODIMP
1.674 +RDFXMLDataSourceImpl::Unassert(nsIRDFResource* source,
1.675 + nsIRDFResource* property,
1.676 + nsIRDFNode* target)
1.677 +{
1.678 + // We don't accept assertions unless we're writable (except in the
1.679 + // case that we're actually _reading_ the datasource in).
1.680 + nsresult rv;
1.681 +
1.682 + if (IsLoading() || mIsWritable) {
1.683 + rv = mInner->Unassert(source, property, target);
1.684 + if (!IsLoading() && rv == NS_RDF_ASSERTION_ACCEPTED)
1.685 + mIsDirty = true;
1.686 + }
1.687 + else {
1.688 + rv = NS_RDF_ASSERTION_REJECTED;
1.689 + }
1.690 +
1.691 + return rv;
1.692 +}
1.693 +
1.694 +NS_IMETHODIMP
1.695 +RDFXMLDataSourceImpl::Change(nsIRDFResource* aSource,
1.696 + nsIRDFResource* aProperty,
1.697 + nsIRDFNode* aOldTarget,
1.698 + nsIRDFNode* aNewTarget)
1.699 +{
1.700 + nsresult rv;
1.701 +
1.702 + if (IsLoading() || mIsWritable) {
1.703 + rv = mInner->Change(aSource, aProperty, aOldTarget, aNewTarget);
1.704 +
1.705 + if (!IsLoading() && rv == NS_RDF_ASSERTION_ACCEPTED)
1.706 + mIsDirty = true;
1.707 + }
1.708 + else {
1.709 + rv = NS_RDF_ASSERTION_REJECTED;
1.710 + }
1.711 +
1.712 + return rv;
1.713 +}
1.714 +
1.715 +NS_IMETHODIMP
1.716 +RDFXMLDataSourceImpl::Move(nsIRDFResource* aOldSource,
1.717 + nsIRDFResource* aNewSource,
1.718 + nsIRDFResource* aProperty,
1.719 + nsIRDFNode* aTarget)
1.720 +{
1.721 + nsresult rv;
1.722 +
1.723 + if (IsLoading() || mIsWritable) {
1.724 + rv = mInner->Move(aOldSource, aNewSource, aProperty, aTarget);
1.725 + if (!IsLoading() && rv == NS_RDF_ASSERTION_ACCEPTED)
1.726 + mIsDirty = true;
1.727 + }
1.728 + else {
1.729 + rv = NS_RDF_ASSERTION_REJECTED;
1.730 + }
1.731 +
1.732 + return rv;
1.733 +}
1.734 +
1.735 +
1.736 +nsresult
1.737 +RDFXMLDataSourceImpl::rdfXMLFlush(nsIURI *aURI)
1.738 +{
1.739 +
1.740 + nsresult rv;
1.741 +
1.742 + {
1.743 + // Quick and dirty check to see if we're in XPCOM shutdown. If
1.744 + // we are, we're screwed: it's too late to serialize because
1.745 + // many of the services that we'll need to acquire to properly
1.746 + // write the file will be unaquirable.
1.747 + NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
1.748 + nsCOMPtr<nsIRDFService> dummy = do_GetService(kRDFServiceCID, &rv);
1.749 + if (NS_FAILED(rv)) {
1.750 + NS_WARNING("unable to Flush() dirty datasource during XPCOM shutdown");
1.751 + return rv;
1.752 + }
1.753 + }
1.754 +
1.755 + // Is it a file? If so, we can write to it. Some day, it'd be nice
1.756 + // if we didn't care what kind of stream this was...
1.757 + nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(aURI);
1.758 +
1.759 + if (fileURL) {
1.760 + nsCOMPtr<nsIFile> file;
1.761 + fileURL->GetFile(getter_AddRefs(file));
1.762 + if (file) {
1.763 + // get a safe output stream, so we don't clobber the datasource file unless
1.764 + // all the writes succeeded.
1.765 + nsCOMPtr<nsIOutputStream> out;
1.766 + rv = NS_NewSafeLocalFileOutputStream(getter_AddRefs(out),
1.767 + file,
1.768 + PR_WRONLY | PR_CREATE_FILE,
1.769 + /*octal*/ 0666,
1.770 + 0);
1.771 + if (NS_FAILED(rv)) return rv;
1.772 +
1.773 + nsCOMPtr<nsIOutputStream> bufferedOut;
1.774 + rv = NS_NewBufferedOutputStream(getter_AddRefs(bufferedOut), out, 4096);
1.775 + if (NS_FAILED(rv)) return rv;
1.776 +
1.777 + rv = Serialize(bufferedOut);
1.778 + if (NS_FAILED(rv)) return rv;
1.779 +
1.780 + // All went ok. Maybe except for problems in Write(), but the stream detects
1.781 + // that for us
1.782 + nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(bufferedOut, &rv);
1.783 + if (NS_FAILED(rv)) return rv;
1.784 +
1.785 + rv = safeStream->Finish();
1.786 + if (NS_FAILED(rv)) {
1.787 + NS_WARNING("failed to save datasource file! possible dataloss");
1.788 + return rv;
1.789 + }
1.790 + }
1.791 + }
1.792 +
1.793 + return NS_OK;
1.794 +}
1.795 +
1.796 +
1.797 +NS_IMETHODIMP
1.798 +RDFXMLDataSourceImpl::FlushTo(const char *aURI)
1.799 +{
1.800 + NS_PRECONDITION(aURI != nullptr, "not initialized");
1.801 + if (!aURI)
1.802 + return NS_ERROR_NULL_POINTER;
1.803 +
1.804 + // XXX this is a hack: any "file:" URI is considered writable. All
1.805 + // others are considered read-only.
1.806 + if ((PL_strncmp(aURI, kFileURIPrefix, sizeof(kFileURIPrefix) - 1) != 0) &&
1.807 + (PL_strncmp(aURI, kResourceURIPrefix, sizeof(kResourceURIPrefix) - 1) != 0))
1.808 + {
1.809 + return NS_ERROR_ILLEGAL_VALUE;
1.810 + }
1.811 +
1.812 + nsCOMPtr<nsIURI> url;
1.813 + nsresult rv = NS_NewURI(getter_AddRefs(url), aURI);
1.814 + if (NS_FAILED(rv))
1.815 + return rv;
1.816 + rv = rdfXMLFlush(url);
1.817 + return rv;
1.818 +}
1.819 +
1.820 +
1.821 +NS_IMETHODIMP
1.822 +RDFXMLDataSourceImpl::Flush(void)
1.823 +{
1.824 + if (!mIsWritable || !mIsDirty)
1.825 + return NS_OK;
1.826 +
1.827 + // while it is not fatal if mURL is not set,
1.828 + // indicate failure since we can't flush back to an unknown origin
1.829 + if (! mURL)
1.830 + return NS_ERROR_NOT_INITIALIZED;
1.831 +
1.832 +#ifdef PR_LOGGING
1.833 + nsAutoCString spec;
1.834 + mURL->GetSpec(spec);
1.835 + PR_LOG(gLog, PR_LOG_NOTICE,
1.836 + ("rdfxml[%p] flush(%s)", this, spec.get()));
1.837 +#endif
1.838 +
1.839 + nsresult rv;
1.840 + if (NS_SUCCEEDED(rv = rdfXMLFlush(mURL)))
1.841 + {
1.842 + mIsDirty = false;
1.843 + }
1.844 + return rv;
1.845 +}
1.846 +
1.847 +
1.848 +//----------------------------------------------------------------------
1.849 +//
1.850 +// nsIRDFXMLDataSource methods
1.851 +//
1.852 +
1.853 +NS_IMETHODIMP
1.854 +RDFXMLDataSourceImpl::GetReadOnly(bool* aIsReadOnly)
1.855 +{
1.856 + *aIsReadOnly = !mIsWritable;
1.857 + return NS_OK;
1.858 +}
1.859 +
1.860 +
1.861 +NS_IMETHODIMP
1.862 +RDFXMLDataSourceImpl::SetReadOnly(bool aIsReadOnly)
1.863 +{
1.864 + if (mIsWritable && aIsReadOnly)
1.865 + mIsWritable = false;
1.866 +
1.867 + return NS_OK;
1.868 +}
1.869 +
1.870 +// nsIChannelEventSink
1.871 +
1.872 +// This code is copied from nsSameOriginChecker::OnChannelRedirect. See
1.873 +// bug 475940 on providing this code in a shared location.
1.874 +NS_IMETHODIMP
1.875 +RDFXMLDataSourceImpl::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
1.876 + nsIChannel *aNewChannel,
1.877 + uint32_t aFlags,
1.878 + nsIAsyncVerifyRedirectCallback *cb)
1.879 +{
1.880 + NS_PRECONDITION(aNewChannel, "Redirecting to null channel?");
1.881 +
1.882 + nsresult rv;
1.883 + nsCOMPtr<nsIScriptSecurityManager> secMan =
1.884 + do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
1.885 + NS_ENSURE_SUCCESS(rv, rv);
1.886 +
1.887 + nsCOMPtr<nsIPrincipal> oldPrincipal;
1.888 + secMan->GetChannelPrincipal(aOldChannel, getter_AddRefs(oldPrincipal));
1.889 +
1.890 + nsCOMPtr<nsIURI> newURI;
1.891 + aNewChannel->GetURI(getter_AddRefs(newURI));
1.892 + nsCOMPtr<nsIURI> newOriginalURI;
1.893 + aNewChannel->GetOriginalURI(getter_AddRefs(newOriginalURI));
1.894 +
1.895 + NS_ENSURE_STATE(oldPrincipal && newURI && newOriginalURI);
1.896 +
1.897 + rv = oldPrincipal->CheckMayLoad(newURI, false, false);
1.898 + if (NS_SUCCEEDED(rv) && newOriginalURI != newURI) {
1.899 + rv = oldPrincipal->CheckMayLoad(newOriginalURI, false, false);
1.900 + }
1.901 +
1.902 + if (NS_FAILED(rv))
1.903 + return rv;
1.904 +
1.905 + cb->OnRedirectVerifyCallback(NS_OK);
1.906 + return NS_OK;
1.907 +}
1.908 +
1.909 +NS_IMETHODIMP
1.910 +RDFXMLDataSourceImpl::Refresh(bool aBlocking)
1.911 +{
1.912 +#ifdef PR_LOGGING
1.913 + nsAutoCString spec;
1.914 + if (mURL) {
1.915 + mURL->GetSpec(spec);
1.916 + }
1.917 + PR_LOG(gLog, PR_LOG_NOTICE,
1.918 + ("rdfxml[%p] refresh(%s) %sblocking", this, spec.get(), (aBlocking ? "" : "non")));
1.919 +#endif
1.920 +
1.921 + // If an asynchronous load is already pending, then just let it do
1.922 + // the honors.
1.923 + if (IsLoading()) {
1.924 + PR_LOG(gLog, PR_LOG_NOTICE,
1.925 + ("rdfxml[%p] refresh(%s) a load was pending", this, spec.get()));
1.926 +
1.927 + if (aBlocking) {
1.928 + NS_WARNING("blocking load requested when async load pending");
1.929 + return NS_ERROR_FAILURE;
1.930 + }
1.931 + else {
1.932 + return NS_OK;
1.933 + }
1.934 + }
1.935 +
1.936 + if (! mURL)
1.937 + return NS_ERROR_FAILURE;
1.938 + nsCOMPtr<nsIRDFXMLParser> parser = do_CreateInstance("@mozilla.org/rdf/xml-parser;1");
1.939 + if (! parser)
1.940 + return NS_ERROR_FAILURE;
1.941 +
1.942 + nsresult rv = parser->ParseAsync(this, mURL, getter_AddRefs(mListener));
1.943 + if (NS_FAILED(rv)) return rv;
1.944 +
1.945 + if (aBlocking) {
1.946 + rv = BlockingParse(mURL, this);
1.947 +
1.948 + mListener = nullptr; // release the parser
1.949 +
1.950 + if (NS_FAILED(rv)) return rv;
1.951 + }
1.952 + else {
1.953 + // Null LoadGroup ?
1.954 + rv = NS_OpenURI(this, nullptr, mURL, nullptr, nullptr, this);
1.955 + if (NS_FAILED(rv)) return rv;
1.956 +
1.957 + // So we don't try to issue two asynchronous loads at once.
1.958 + mLoadState = eLoadState_Pending;
1.959 + }
1.960 +
1.961 + return NS_OK;
1.962 +}
1.963 +
1.964 +NS_IMETHODIMP
1.965 +RDFXMLDataSourceImpl::BeginLoad(void)
1.966 +{
1.967 +#ifdef PR_LOGGING
1.968 + nsAutoCString spec;
1.969 + if (mURL) {
1.970 + mURL->GetSpec(spec);
1.971 + }
1.972 + PR_LOG(gLog, PR_LOG_NOTICE,
1.973 + ("rdfxml[%p] begin-load(%s)", this, spec.get()));
1.974 +#endif
1.975 +
1.976 + mLoadState = eLoadState_Loading;
1.977 + for (int32_t i = mObservers.Count() - 1; i >= 0; --i) {
1.978 + // Make sure to hold a strong reference to the observer so
1.979 + // that it doesn't go away in this call if it removes itself
1.980 + // as an observer
1.981 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.982 +
1.983 + if (obs) {
1.984 + obs->OnBeginLoad(this);
1.985 + }
1.986 + }
1.987 + return NS_OK;
1.988 +}
1.989 +
1.990 +NS_IMETHODIMP
1.991 +RDFXMLDataSourceImpl::Interrupt(void)
1.992 +{
1.993 +#ifdef PR_LOGGING
1.994 + nsAutoCString spec;
1.995 + if (mURL) {
1.996 + mURL->GetSpec(spec);
1.997 + }
1.998 + PR_LOG(gLog, PR_LOG_NOTICE,
1.999 + ("rdfxml[%p] interrupt(%s)", this, spec.get()));
1.1000 +#endif
1.1001 +
1.1002 + for (int32_t i = mObservers.Count() - 1; i >= 0; --i) {
1.1003 + // Make sure to hold a strong reference to the observer so
1.1004 + // that it doesn't go away in this call if it removes itself
1.1005 + // as an observer
1.1006 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.1007 +
1.1008 + if (obs) {
1.1009 + obs->OnInterrupt(this);
1.1010 + }
1.1011 + }
1.1012 + return NS_OK;
1.1013 +}
1.1014 +
1.1015 +NS_IMETHODIMP
1.1016 +RDFXMLDataSourceImpl::Resume(void)
1.1017 +{
1.1018 +#ifdef PR_LOGGING
1.1019 + nsAutoCString spec;
1.1020 + if (mURL) {
1.1021 + mURL->GetSpec(spec);
1.1022 + }
1.1023 + PR_LOG(gLog, PR_LOG_NOTICE,
1.1024 + ("rdfxml[%p] resume(%s)", this, spec.get()));
1.1025 +#endif
1.1026 +
1.1027 + for (int32_t i = mObservers.Count() - 1; i >= 0; --i) {
1.1028 + // Make sure to hold a strong reference to the observer so
1.1029 + // that it doesn't go away in this call if it removes itself
1.1030 + // as an observer
1.1031 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.1032 +
1.1033 + if (obs) {
1.1034 + obs->OnResume(this);
1.1035 + }
1.1036 + }
1.1037 + return NS_OK;
1.1038 +}
1.1039 +
1.1040 +NS_IMETHODIMP
1.1041 +RDFXMLDataSourceImpl::EndLoad(void)
1.1042 +{
1.1043 +#ifdef PR_LOGGING
1.1044 + nsAutoCString spec;
1.1045 + if (mURL) {
1.1046 + mURL->GetSpec(spec);
1.1047 + }
1.1048 + PR_LOG(gLog, PR_LOG_NOTICE,
1.1049 + ("rdfxml[%p] end-load(%s)", this, spec.get()));
1.1050 +#endif
1.1051 +
1.1052 + mLoadState = eLoadState_Loaded;
1.1053 +
1.1054 + // Clear out any unmarked assertions from the datasource.
1.1055 + nsCOMPtr<nsIRDFPurgeableDataSource> gcable = do_QueryInterface(mInner);
1.1056 + if (gcable) {
1.1057 + gcable->Sweep();
1.1058 + }
1.1059 +
1.1060 + // Notify load observers
1.1061 + for (int32_t i = mObservers.Count() - 1; i >= 0; --i) {
1.1062 + // Make sure to hold a strong reference to the observer so
1.1063 + // that it doesn't go away in this call if it removes itself
1.1064 + // as an observer
1.1065 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.1066 +
1.1067 + if (obs) {
1.1068 + obs->OnEndLoad(this);
1.1069 + }
1.1070 + }
1.1071 + return NS_OK;
1.1072 +}
1.1073 +
1.1074 +NS_IMETHODIMP
1.1075 +RDFXMLDataSourceImpl::AddNameSpace(nsIAtom* aPrefix, const nsString& aURI)
1.1076 +{
1.1077 + mNameSpaces.Put(aURI, aPrefix);
1.1078 + return NS_OK;
1.1079 +}
1.1080 +
1.1081 +
1.1082 +NS_IMETHODIMP
1.1083 +RDFXMLDataSourceImpl::AddXMLSinkObserver(nsIRDFXMLSinkObserver* aObserver)
1.1084 +{
1.1085 + if (! aObserver)
1.1086 + return NS_ERROR_NULL_POINTER;
1.1087 +
1.1088 + mObservers.AppendObject(aObserver);
1.1089 + return NS_OK;
1.1090 +}
1.1091 +
1.1092 +NS_IMETHODIMP
1.1093 +RDFXMLDataSourceImpl::RemoveXMLSinkObserver(nsIRDFXMLSinkObserver* aObserver)
1.1094 +{
1.1095 + if (! aObserver)
1.1096 + return NS_ERROR_NULL_POINTER;
1.1097 +
1.1098 + mObservers.RemoveObject(aObserver);
1.1099 +
1.1100 + return NS_OK;
1.1101 +}
1.1102 +
1.1103 +
1.1104 +//----------------------------------------------------------------------
1.1105 +//
1.1106 +// nsIRequestObserver
1.1107 +//
1.1108 +
1.1109 +NS_IMETHODIMP
1.1110 +RDFXMLDataSourceImpl::OnStartRequest(nsIRequest *request, nsISupports *ctxt)
1.1111 +{
1.1112 + return mListener->OnStartRequest(request, ctxt);
1.1113 +}
1.1114 +
1.1115 +NS_IMETHODIMP
1.1116 +RDFXMLDataSourceImpl::OnStopRequest(nsIRequest *request,
1.1117 + nsISupports *ctxt,
1.1118 + nsresult status)
1.1119 +{
1.1120 + if (NS_FAILED(status)) {
1.1121 + for (int32_t i = mObservers.Count() - 1; i >= 0; --i) {
1.1122 + // Make sure to hold a strong reference to the observer so
1.1123 + // that it doesn't go away in this call if it removes
1.1124 + // itself as an observer
1.1125 + nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];
1.1126 +
1.1127 + if (obs) {
1.1128 + obs->OnError(this, status, nullptr);
1.1129 + }
1.1130 + }
1.1131 + }
1.1132 +
1.1133 + nsresult rv;
1.1134 + rv = mListener->OnStopRequest(request, ctxt, status);
1.1135 +
1.1136 + mListener = nullptr; // release the parser
1.1137 +
1.1138 + return rv;
1.1139 +}
1.1140 +
1.1141 +//----------------------------------------------------------------------
1.1142 +//
1.1143 +// nsIStreamListener
1.1144 +//
1.1145 +
1.1146 +NS_IMETHODIMP
1.1147 +RDFXMLDataSourceImpl::OnDataAvailable(nsIRequest *request,
1.1148 + nsISupports *ctxt,
1.1149 + nsIInputStream *inStr,
1.1150 + uint64_t sourceOffset,
1.1151 + uint32_t count)
1.1152 +{
1.1153 + return mListener->OnDataAvailable(request, ctxt, inStr, sourceOffset, count);
1.1154 +}
1.1155 +
1.1156 +//----------------------------------------------------------------------
1.1157 +//
1.1158 +// nsIRDFXMLSource
1.1159 +//
1.1160 +
1.1161 +NS_IMETHODIMP
1.1162 +RDFXMLDataSourceImpl::Serialize(nsIOutputStream* aStream)
1.1163 +{
1.1164 + nsresult rv;
1.1165 + nsCOMPtr<nsIRDFXMLSerializer> serializer
1.1166 + = do_CreateInstance("@mozilla.org/rdf/xml-serializer;1", &rv);
1.1167 +
1.1168 + if (! serializer)
1.1169 + return rv;
1.1170 +
1.1171 + rv = serializer->Init(this);
1.1172 + if (NS_FAILED(rv)) return rv;
1.1173 +
1.1174 + // Add any namespace information that we picked up when reading
1.1175 + // the RDF/XML
1.1176 + nsNameSpaceMap::const_iterator last = mNameSpaces.last();
1.1177 + for (nsNameSpaceMap::const_iterator iter = mNameSpaces.first();
1.1178 + iter != last; ++iter) {
1.1179 + // We might wanna change nsIRDFXMLSerializer to nsACString and
1.1180 + // use a heap allocated buffer here in the future.
1.1181 + NS_ConvertUTF8toUTF16 uri(iter->mURI);
1.1182 + serializer->AddNameSpace(iter->mPrefix, uri);
1.1183 + }
1.1184 +
1.1185 + // Serialize!
1.1186 + nsCOMPtr<nsIRDFXMLSource> source = do_QueryInterface(serializer);
1.1187 + if (! source)
1.1188 + return NS_ERROR_FAILURE;
1.1189 +
1.1190 + return source->Serialize(aStream);
1.1191 +}
