1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rdf/base/src/nsRDFXMLSerializer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,1126 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=4 sw=4 et tw=80:
1.6 + *
1.7 + * This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#include "nsRDFXMLSerializer.h"
1.12 +
1.13 +#include "nsIAtom.h"
1.14 +#include "nsIOutputStream.h"
1.15 +#include "nsIRDFService.h"
1.16 +#include "nsIRDFContainerUtils.h"
1.17 +#include "nsIServiceManager.h"
1.18 +#include "nsString.h"
1.19 +#include "nsXPIDLString.h"
1.20 +#include "nsTArray.h"
1.21 +#include "rdf.h"
1.22 +#include "rdfutil.h"
1.23 +#include "mozilla/Attributes.h"
1.24 +
1.25 +#include "rdfIDataSource.h"
1.26 +
1.27 +int32_t nsRDFXMLSerializer::gRefCnt = 0;
1.28 +nsIRDFContainerUtils* nsRDFXMLSerializer::gRDFC;
1.29 +nsIRDFResource* nsRDFXMLSerializer::kRDF_instanceOf;
1.30 +nsIRDFResource* nsRDFXMLSerializer::kRDF_type;
1.31 +nsIRDFResource* nsRDFXMLSerializer::kRDF_nextVal;
1.32 +nsIRDFResource* nsRDFXMLSerializer::kRDF_Bag;
1.33 +nsIRDFResource* nsRDFXMLSerializer::kRDF_Seq;
1.34 +nsIRDFResource* nsRDFXMLSerializer::kRDF_Alt;
1.35 +
1.36 +static const char kRDFDescriptionOpen[] = " <RDF:Description";
1.37 +static const char kIDAttr[] = " RDF:ID=\"";
1.38 +static const char kAboutAttr[] = " RDF:about=\"";
1.39 +static const char kRDFDescriptionClose[] = " </RDF:Description>\n";
1.40 +static const char kRDFResource1[] = " RDF:resource=\"";
1.41 +static const char kRDFResource2[] = "\"/>\n";
1.42 +static const char kRDFParseTypeInteger[] = " NC:parseType=\"Integer\">";
1.43 +static const char kRDFParseTypeDate[] = " NC:parseType=\"Date\">";
1.44 +static const char kRDFUnknown[] = "><!-- unknown node type -->";
1.45 +
1.46 +nsresult
1.47 +nsRDFXMLSerializer::Create(nsISupports* aOuter, REFNSIID aIID, void** aResult)
1.48 +{
1.49 + if (aOuter)
1.50 + return NS_ERROR_NO_AGGREGATION;
1.51 +
1.52 + nsCOMPtr<nsIRDFXMLSerializer> result = new nsRDFXMLSerializer();
1.53 + if (! result)
1.54 + return NS_ERROR_OUT_OF_MEMORY;
1.55 + // The serializer object is here, addref gRefCnt so that the
1.56 + // destructor can safely release it.
1.57 + gRefCnt++;
1.58 +
1.59 + nsresult rv;
1.60 + rv = result->QueryInterface(aIID, aResult);
1.61 +
1.62 + if (NS_FAILED(rv)) return rv;
1.63 +
1.64 + if (gRefCnt == 1) do {
1.65 + nsCOMPtr<nsIRDFService> rdf = do_GetService("@mozilla.org/rdf/rdf-service;1", &rv);
1.66 + if (NS_FAILED(rv)) break;
1.67 +
1.68 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "instanceOf"),
1.69 + &kRDF_instanceOf);
1.70 + if (NS_FAILED(rv)) break;
1.71 +
1.72 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "type"),
1.73 + &kRDF_type);
1.74 + if (NS_FAILED(rv)) break;
1.75 +
1.76 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "nextVal"),
1.77 + &kRDF_nextVal);
1.78 + if (NS_FAILED(rv)) break;
1.79 +
1.80 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Bag"),
1.81 + &kRDF_Bag);
1.82 + if (NS_FAILED(rv)) break;
1.83 +
1.84 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Seq"),
1.85 + &kRDF_Seq);
1.86 + if (NS_FAILED(rv)) break;
1.87 +
1.88 + rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Alt"),
1.89 + &kRDF_Alt);
1.90 + if (NS_FAILED(rv)) break;
1.91 +
1.92 + rv = CallGetService("@mozilla.org/rdf/container-utils;1", &gRDFC);
1.93 + if (NS_FAILED(rv)) break;
1.94 + } while (0);
1.95 +
1.96 + return rv;
1.97 +}
1.98 +
1.99 +nsRDFXMLSerializer::nsRDFXMLSerializer()
1.100 +{
1.101 + MOZ_COUNT_CTOR(nsRDFXMLSerializer);
1.102 +}
1.103 +
1.104 +nsRDFXMLSerializer::~nsRDFXMLSerializer()
1.105 +{
1.106 + MOZ_COUNT_DTOR(nsRDFXMLSerializer);
1.107 +
1.108 + if (--gRefCnt == 0) {
1.109 + NS_IF_RELEASE(kRDF_Bag);
1.110 + NS_IF_RELEASE(kRDF_Seq);
1.111 + NS_IF_RELEASE(kRDF_Alt);
1.112 + NS_IF_RELEASE(kRDF_instanceOf);
1.113 + NS_IF_RELEASE(kRDF_type);
1.114 + NS_IF_RELEASE(kRDF_nextVal);
1.115 + NS_IF_RELEASE(gRDFC);
1.116 + }
1.117 +}
1.118 +
1.119 +NS_IMPL_ISUPPORTS(nsRDFXMLSerializer, nsIRDFXMLSerializer, nsIRDFXMLSource)
1.120 +
1.121 +NS_IMETHODIMP
1.122 +nsRDFXMLSerializer::Init(nsIRDFDataSource* aDataSource)
1.123 +{
1.124 + if (! aDataSource)
1.125 + return NS_ERROR_NULL_POINTER;
1.126 +
1.127 + mDataSource = aDataSource;
1.128 + mDataSource->GetURI(getter_Copies(mBaseURLSpec));
1.129 +
1.130 + // Add the ``RDF'' prefix, by default.
1.131 + nsCOMPtr<nsIAtom> prefix;
1.132 +
1.133 + prefix = do_GetAtom("RDF");
1.134 + AddNameSpace(prefix, NS_LITERAL_STRING("http://www.w3.org/1999/02/22-rdf-syntax-ns#"));
1.135 +
1.136 + prefix = do_GetAtom("NC");
1.137 + AddNameSpace(prefix, NS_LITERAL_STRING("http://home.netscape.com/NC-rdf#"));
1.138 +
1.139 + mPrefixID = 0;
1.140 +
1.141 + return NS_OK;
1.142 +}
1.143 +
1.144 +NS_IMETHODIMP
1.145 +nsRDFXMLSerializer::AddNameSpace(nsIAtom* aPrefix, const nsAString& aURI)
1.146 +{
1.147 + nsCOMPtr<nsIAtom> prefix = aPrefix;
1.148 + if (!prefix) {
1.149 + // Make up a prefix, we don't want default namespaces, so
1.150 + // that we can use QNames for elements and attributes alike.
1.151 + prefix = EnsureNewPrefix();
1.152 + }
1.153 + mNameSpaces.Put(aURI, prefix);
1.154 + return NS_OK;
1.155 +}
1.156 +
1.157 +static nsresult
1.158 +rdf_BlockingWrite(nsIOutputStream* stream, const char* buf, uint32_t size)
1.159 +{
1.160 + uint32_t written = 0;
1.161 + uint32_t remaining = size;
1.162 + while (remaining > 0) {
1.163 + nsresult rv;
1.164 + uint32_t cb;
1.165 +
1.166 + if (NS_FAILED(rv = stream->Write(buf + written, remaining, &cb)))
1.167 + return rv;
1.168 +
1.169 + written += cb;
1.170 + remaining -= cb;
1.171 + }
1.172 + return NS_OK;
1.173 +}
1.174 +
1.175 +static nsresult
1.176 +rdf_BlockingWrite(nsIOutputStream* stream, const nsCSubstring& s)
1.177 +{
1.178 + return rdf_BlockingWrite(stream, s.BeginReading(), s.Length());
1.179 +}
1.180 +
1.181 +static nsresult
1.182 +rdf_BlockingWrite(nsIOutputStream* stream, const nsAString& s)
1.183 +{
1.184 + NS_ConvertUTF16toUTF8 utf8(s);
1.185 + return rdf_BlockingWrite(stream, utf8.get(), utf8.Length());
1.186 +}
1.187 +
1.188 +already_AddRefed<nsIAtom>
1.189 +nsRDFXMLSerializer::EnsureNewPrefix()
1.190 +{
1.191 + nsAutoString qname;
1.192 + nsCOMPtr<nsIAtom> prefix;
1.193 + bool isNewPrefix;
1.194 + do {
1.195 + isNewPrefix = true;
1.196 + qname.AssignLiteral("NS");
1.197 + qname.AppendInt(++mPrefixID, 10);
1.198 + prefix = do_GetAtom(qname);
1.199 + nsNameSpaceMap::const_iterator iter = mNameSpaces.first();
1.200 + while (iter != mNameSpaces.last() && isNewPrefix) {
1.201 + isNewPrefix = (iter->mPrefix != prefix);
1.202 + ++iter;
1.203 + }
1.204 + } while (!isNewPrefix);
1.205 + return prefix.forget();
1.206 +}
1.207 +
1.208 +// This converts a property resource (like
1.209 +// "http://www.w3.org/TR/WD-rdf-syntax#Description") into a QName
1.210 +// ("RDF:Description"), and registers the namespace, if it's made up.
1.211 +
1.212 +nsresult
1.213 +nsRDFXMLSerializer::RegisterQName(nsIRDFResource* aResource)
1.214 +{
1.215 + nsAutoCString uri, qname;
1.216 + aResource->GetValueUTF8(uri);
1.217 +
1.218 + nsNameSpaceMap::const_iterator iter = mNameSpaces.GetNameSpaceOf(uri);
1.219 + if (iter != mNameSpaces.last()) {
1.220 + NS_ENSURE_TRUE(iter->mPrefix, NS_ERROR_UNEXPECTED);
1.221 + iter->mPrefix->ToUTF8String(qname);
1.222 + qname.Append(':');
1.223 + qname += StringTail(uri, uri.Length() - iter->mURI.Length());
1.224 + mQNames.Put(aResource, qname);
1.225 + return NS_OK;
1.226 + }
1.227 +
1.228 + // Okay, so we don't have it in our map. Try to make one up. This
1.229 + // is very bogus.
1.230 + int32_t i = uri.RFindChar('#'); // first try a '#'
1.231 + if (i == -1) {
1.232 + i = uri.RFindChar('/');
1.233 + if (i == -1) {
1.234 + // Okay, just punt and assume there is _no_ namespace on
1.235 + // this thing...
1.236 + mQNames.Put(aResource, uri);
1.237 + return NS_OK;
1.238 + }
1.239 + }
1.240 +
1.241 + // Take whatever is to the right of the '#' or '/' and call it the
1.242 + // local name, make up a prefix.
1.243 + nsCOMPtr<nsIAtom> prefix = EnsureNewPrefix();
1.244 + mNameSpaces.Put(StringHead(uri, i+1), prefix);
1.245 + prefix->ToUTF8String(qname);
1.246 + qname.Append(':');
1.247 + qname += StringTail(uri, uri.Length() - (i + 1));
1.248 +
1.249 + mQNames.Put(aResource, qname);
1.250 + return NS_OK;
1.251 +}
1.252 +
1.253 +nsresult
1.254 +nsRDFXMLSerializer::GetQName(nsIRDFResource* aResource, nsCString& aQName)
1.255 +{
1.256 + return mQNames.Get(aResource, &aQName) ? NS_OK : NS_ERROR_UNEXPECTED;
1.257 +}
1.258 +
1.259 +bool
1.260 +nsRDFXMLSerializer::IsContainerProperty(nsIRDFResource* aProperty)
1.261 +{
1.262 + // Return `true' if the property is an internal property related
1.263 + // to being a container.
1.264 + if (aProperty == kRDF_instanceOf)
1.265 + return true;
1.266 +
1.267 + if (aProperty == kRDF_nextVal)
1.268 + return true;
1.269 +
1.270 + bool isOrdinal = false;
1.271 + gRDFC->IsOrdinalProperty(aProperty, &isOrdinal);
1.272 + if (isOrdinal)
1.273 + return true;
1.274 +
1.275 + return false;
1.276 +}
1.277 +
1.278 +
1.279 +// convert '&', '<', and '>' into "&", "<", and ">", respectively.
1.280 +static const char amp[] = "&";
1.281 +static const char lt[] = "<";
1.282 +static const char gt[] = ">";
1.283 +static const char quot[] = """;
1.284 +
1.285 +static void
1.286 +rdf_EscapeAmpersandsAndAngleBrackets(nsCString& s)
1.287 +{
1.288 + uint32_t newLength, origLength;
1.289 + newLength = origLength = s.Length();
1.290 +
1.291 + // Compute the length of the result string.
1.292 + const char* start = s.BeginReading();
1.293 + const char* end = s.EndReading();
1.294 + const char* c = start;
1.295 + while (c != end) {
1.296 + switch (*c) {
1.297 + case '&' :
1.298 + newLength += sizeof(amp) - 2;
1.299 + break;
1.300 + case '<':
1.301 + case '>':
1.302 + newLength += sizeof(gt) - 2;
1.303 + break;
1.304 + default:
1.305 + break;
1.306 + }
1.307 + ++c;
1.308 + }
1.309 + if (newLength == origLength) {
1.310 + // nothing to escape
1.311 + return;
1.312 + }
1.313 +
1.314 + // escape the chars from the end back to the front.
1.315 + s.SetLength(newLength);
1.316 +
1.317 + // Buffer might have changed, get the pointers again
1.318 + start = s.BeginReading(); // begin of string
1.319 + c = start + origLength - 1; // last char in original string
1.320 + char* w = s.EndWriting() - 1; // last char in grown buffer
1.321 + while (c >= start) {
1.322 + switch (*c) {
1.323 + case '&' :
1.324 + w -= 4;
1.325 + nsCharTraits<char>::copy(w, amp, sizeof(amp) - 1);
1.326 + break;
1.327 + case '<':
1.328 + w -= 3;
1.329 + nsCharTraits<char>::copy(w, lt, sizeof(lt) - 1);
1.330 + break;
1.331 + case '>':
1.332 + w -= 3;
1.333 + nsCharTraits<char>::copy(w, gt, sizeof(gt) - 1);
1.334 + break;
1.335 + default:
1.336 + *w = *c;
1.337 + }
1.338 + --w;
1.339 + --c;
1.340 + }
1.341 +}
1.342 +
1.343 +// convert '"' to """
1.344 +static void
1.345 +rdf_EscapeQuotes(nsCString& s)
1.346 +{
1.347 + int32_t i = 0;
1.348 + while ((i = s.FindChar('"', i)) != -1) {
1.349 + s.Replace(i, 1, quot, sizeof(quot) - 1);
1.350 + i += sizeof(quot) - 2;
1.351 + }
1.352 +}
1.353 +
1.354 +static void
1.355 +rdf_EscapeAttributeValue(nsCString& s)
1.356 +{
1.357 + rdf_EscapeAmpersandsAndAngleBrackets(s);
1.358 + rdf_EscapeQuotes(s);
1.359 +}
1.360 +
1.361 +
1.362 +nsresult
1.363 +nsRDFXMLSerializer::SerializeInlineAssertion(nsIOutputStream* aStream,
1.364 + nsIRDFResource* aResource,
1.365 + nsIRDFResource* aProperty,
1.366 + nsIRDFLiteral* aValue)
1.367 +{
1.368 + nsresult rv;
1.369 + nsCString qname;
1.370 + rv = GetQName(aProperty, qname);
1.371 + NS_ENSURE_SUCCESS(rv, rv);
1.372 +
1.373 + rv = rdf_BlockingWrite(aStream,
1.374 + NS_LITERAL_CSTRING("\n "));
1.375 + if (NS_FAILED(rv)) return rv;
1.376 +
1.377 + const char16_t* value;
1.378 + aValue->GetValueConst(&value);
1.379 + NS_ConvertUTF16toUTF8 s(value);
1.380 +
1.381 + rdf_EscapeAttributeValue(s);
1.382 +
1.383 + rv = rdf_BlockingWrite(aStream, qname);
1.384 + if (NS_FAILED(rv)) return rv;
1.385 + rv = rdf_BlockingWrite(aStream, "=\"", 2);
1.386 + if (NS_FAILED(rv)) return rv;
1.387 + s.Append('"');
1.388 + return rdf_BlockingWrite(aStream, s);
1.389 +}
1.390 +
1.391 +nsresult
1.392 +nsRDFXMLSerializer::SerializeChildAssertion(nsIOutputStream* aStream,
1.393 + nsIRDFResource* aResource,
1.394 + nsIRDFResource* aProperty,
1.395 + nsIRDFNode* aValue)
1.396 +{
1.397 + nsCString qname;
1.398 + nsresult rv = GetQName(aProperty, qname);
1.399 + NS_ENSURE_SUCCESS(rv, rv);
1.400 +
1.401 + rv = rdf_BlockingWrite(aStream, " <", 5);
1.402 + if (NS_FAILED(rv)) return rv;
1.403 + rv = rdf_BlockingWrite(aStream, qname);
1.404 + if (NS_FAILED(rv)) return rv;
1.405 +
1.406 + nsCOMPtr<nsIRDFResource> resource;
1.407 + nsCOMPtr<nsIRDFLiteral> literal;
1.408 + nsCOMPtr<nsIRDFInt> number;
1.409 + nsCOMPtr<nsIRDFDate> date;
1.410 +
1.411 + if ((resource = do_QueryInterface(aValue)) != nullptr) {
1.412 + nsAutoCString uri;
1.413 + resource->GetValueUTF8(uri);
1.414 +
1.415 + rdf_MakeRelativeRef(mBaseURLSpec, uri);
1.416 + rdf_EscapeAttributeValue(uri);
1.417 +
1.418 + rv = rdf_BlockingWrite(aStream, kRDFResource1,
1.419 + sizeof(kRDFResource1) - 1);
1.420 + if (NS_FAILED(rv)) return rv;
1.421 + rv = rdf_BlockingWrite(aStream, uri);
1.422 + if (NS_FAILED(rv)) return rv;
1.423 + rv = rdf_BlockingWrite(aStream, kRDFResource2,
1.424 + sizeof(kRDFResource2) - 1);
1.425 + if (NS_FAILED(rv)) return rv;
1.426 +
1.427 + goto no_close_tag;
1.428 + }
1.429 + else if ((literal = do_QueryInterface(aValue)) != nullptr) {
1.430 + const char16_t *value;
1.431 + literal->GetValueConst(&value);
1.432 + NS_ConvertUTF16toUTF8 s(value);
1.433 +
1.434 + rdf_EscapeAmpersandsAndAngleBrackets(s);
1.435 +
1.436 + rv = rdf_BlockingWrite(aStream, ">", 1);
1.437 + if (NS_FAILED(rv)) return rv;
1.438 + rv = rdf_BlockingWrite(aStream, s);
1.439 + if (NS_FAILED(rv)) return rv;
1.440 + }
1.441 + else if ((number = do_QueryInterface(aValue)) != nullptr) {
1.442 + int32_t value;
1.443 + number->GetValue(&value);
1.444 +
1.445 + nsAutoCString n;
1.446 + n.AppendInt(value);
1.447 +
1.448 + rv = rdf_BlockingWrite(aStream, kRDFParseTypeInteger,
1.449 + sizeof(kRDFParseTypeInteger) - 1);
1.450 + if (NS_FAILED(rv)) return rv;
1.451 + rv = rdf_BlockingWrite(aStream, n);
1.452 + if (NS_FAILED(rv)) return rv;
1.453 + }
1.454 + else if ((date = do_QueryInterface(aValue)) != nullptr) {
1.455 + PRTime value;
1.456 + date->GetValue(&value);
1.457 +
1.458 + nsAutoCString s;
1.459 + rdf_FormatDate(value, s);
1.460 +
1.461 + rv = rdf_BlockingWrite(aStream, kRDFParseTypeDate,
1.462 + sizeof(kRDFParseTypeDate) - 1);
1.463 + if (NS_FAILED(rv)) return rv;
1.464 + rv = rdf_BlockingWrite(aStream, s);
1.465 + if (NS_FAILED(rv)) return rv;
1.466 + }
1.467 + else {
1.468 + // XXX it doesn't support nsIRDFResource _or_ nsIRDFLiteral???
1.469 + // We should serialize nsIRDFInt, nsIRDFDate, etc...
1.470 + NS_WARNING("unknown RDF node type");
1.471 +
1.472 + rv = rdf_BlockingWrite(aStream, kRDFUnknown, sizeof(kRDFUnknown) - 1);
1.473 + if (NS_FAILED(rv)) return rv;
1.474 + }
1.475 +
1.476 + rv = rdf_BlockingWrite(aStream, "</", 2);
1.477 + if (NS_FAILED(rv)) return rv;
1.478 + rv = rdf_BlockingWrite(aStream, qname);
1.479 + if (NS_FAILED(rv)) return rv;
1.480 + return rdf_BlockingWrite(aStream, ">\n", 2);
1.481 +
1.482 + no_close_tag:
1.483 + return NS_OK;
1.484 +}
1.485 +
1.486 +nsresult
1.487 +nsRDFXMLSerializer::SerializeProperty(nsIOutputStream* aStream,
1.488 + nsIRDFResource* aResource,
1.489 + nsIRDFResource* aProperty,
1.490 + bool aInline,
1.491 + int32_t* aSkipped)
1.492 +{
1.493 + nsresult rv = NS_OK;
1.494 +
1.495 + int32_t skipped = 0;
1.496 +
1.497 + nsCOMPtr<nsISimpleEnumerator> assertions;
1.498 + mDataSource->GetTargets(aResource, aProperty, true, getter_AddRefs(assertions));
1.499 + if (! assertions)
1.500 + return NS_ERROR_FAILURE;
1.501 +
1.502 + // Serializing the assertion inline is ok as long as the property has
1.503 + // only one target value, and it is a literal that doesn't include line
1.504 + // breaks.
1.505 + bool needsChild = false;
1.506 +
1.507 + while (1) {
1.508 + bool hasMore = false;
1.509 + assertions->HasMoreElements(&hasMore);
1.510 + if (! hasMore)
1.511 + break;
1.512 +
1.513 + nsCOMPtr<nsISupports> isupports;
1.514 + assertions->GetNext(getter_AddRefs(isupports));
1.515 + nsCOMPtr<nsIRDFLiteral> literal = do_QueryInterface(isupports);
1.516 + needsChild |= (!literal);
1.517 +
1.518 + if (!needsChild) {
1.519 + assertions->HasMoreElements(&needsChild);
1.520 + if (!needsChild) {
1.521 + const char16_t* literalVal = nullptr;
1.522 + literal->GetValueConst(&literalVal);
1.523 + if (literalVal) {
1.524 + for (; *literalVal; literalVal++) {
1.525 + if (*literalVal == char16_t('\n') ||
1.526 + *literalVal == char16_t('\r')) {
1.527 + needsChild = true;
1.528 + break;
1.529 + }
1.530 + }
1.531 + }
1.532 + }
1.533 + }
1.534 +
1.535 + if (aInline && !needsChild) {
1.536 + rv = SerializeInlineAssertion(aStream, aResource, aProperty, literal);
1.537 + }
1.538 + else if (!aInline && needsChild) {
1.539 + nsCOMPtr<nsIRDFNode> value = do_QueryInterface(isupports);
1.540 + rv = SerializeChildAssertion(aStream, aResource, aProperty, value);
1.541 + }
1.542 + else {
1.543 + ++skipped;
1.544 + rv = NS_OK;
1.545 + }
1.546 +
1.547 + if (NS_FAILED(rv))
1.548 + break;
1.549 + }
1.550 +
1.551 + *aSkipped += skipped;
1.552 + return rv;
1.553 +}
1.554 +
1.555 +
1.556 +nsresult
1.557 +nsRDFXMLSerializer::SerializeDescription(nsIOutputStream* aStream,
1.558 + nsIRDFResource* aResource)
1.559 +{
1.560 + nsresult rv;
1.561 +
1.562 + bool isTypedNode = false;
1.563 + nsCString typeQName;
1.564 +
1.565 + nsCOMPtr<nsIRDFNode> typeNode;
1.566 + mDataSource->GetTarget(aResource, kRDF_type, true, getter_AddRefs(typeNode));
1.567 + if (typeNode) {
1.568 + nsCOMPtr<nsIRDFResource> type = do_QueryInterface(typeNode, &rv);
1.569 + if (type) {
1.570 + // Try to get a namespace prefix. If none is available,
1.571 + // just treat the description as if it weren't a typed node
1.572 + // after all and emit rdf:type as a normal property. This
1.573 + // seems preferable to using a bogus (invented) prefix.
1.574 + isTypedNode = NS_SUCCEEDED(GetQName(type, typeQName));
1.575 + }
1.576 + }
1.577 +
1.578 + nsAutoCString uri;
1.579 + rv = aResource->GetValueUTF8(uri);
1.580 + if (NS_FAILED(rv)) return rv;
1.581 +
1.582 + rdf_MakeRelativeRef(mBaseURLSpec, uri);
1.583 + rdf_EscapeAttributeValue(uri);
1.584 +
1.585 + // Emit an open tag and the subject
1.586 + if (isTypedNode) {
1.587 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_STRING(" <"));
1.588 + if (NS_FAILED(rv)) return rv;
1.589 + // Watch out for the default namespace!
1.590 + rv = rdf_BlockingWrite(aStream, typeQName);
1.591 + if (NS_FAILED(rv)) return rv;
1.592 + }
1.593 + else {
1.594 + rv = rdf_BlockingWrite(aStream, kRDFDescriptionOpen,
1.595 + sizeof(kRDFDescriptionOpen) - 1);
1.596 + if (NS_FAILED(rv)) return rv;
1.597 + }
1.598 + if (uri[0] == char16_t('#')) {
1.599 + uri.Cut(0, 1);
1.600 + rv = rdf_BlockingWrite(aStream, kIDAttr, sizeof(kIDAttr) - 1);
1.601 + }
1.602 + else {
1.603 + rv = rdf_BlockingWrite(aStream, kAboutAttr, sizeof(kAboutAttr) - 1);
1.604 + }
1.605 + if (NS_FAILED(rv)) return rv;
1.606 +
1.607 + uri.Append('"');
1.608 + rv = rdf_BlockingWrite(aStream, uri);
1.609 + if (NS_FAILED(rv)) return rv;
1.610 +
1.611 + // Any value that's a literal we can write out as an inline
1.612 + // attribute on the RDF:Description
1.613 + nsAutoTArray<nsIRDFResource*, 8> visited;
1.614 + int32_t skipped = 0;
1.615 +
1.616 + nsCOMPtr<nsISimpleEnumerator> arcs;
1.617 + mDataSource->ArcLabelsOut(aResource, getter_AddRefs(arcs));
1.618 +
1.619 + if (arcs) {
1.620 + // Don't re-serialize rdf:type later on
1.621 + if (isTypedNode)
1.622 + visited.AppendElement(kRDF_type);
1.623 +
1.624 + while (1) {
1.625 + bool hasMore = false;
1.626 + arcs->HasMoreElements(&hasMore);
1.627 + if (! hasMore)
1.628 + break;
1.629 +
1.630 + nsCOMPtr<nsISupports> isupports;
1.631 + arcs->GetNext(getter_AddRefs(isupports));
1.632 +
1.633 + nsCOMPtr<nsIRDFResource> property = do_QueryInterface(isupports);
1.634 + if (! property)
1.635 + continue;
1.636 +
1.637 + // Ignore properties that pertain to containers; we may be
1.638 + // called from SerializeContainer() if the container resource
1.639 + // has been assigned non-container properties.
1.640 + if (IsContainerProperty(property))
1.641 + continue;
1.642 +
1.643 + // Only serialize values for the property once.
1.644 + if (visited.Contains(property.get()))
1.645 + continue;
1.646 +
1.647 + visited.AppendElement(property.get());
1.648 +
1.649 + SerializeProperty(aStream, aResource, property, true, &skipped);
1.650 + }
1.651 + }
1.652 +
1.653 + if (skipped) {
1.654 + // Close the RDF:Description tag.
1.655 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(">\n"));
1.656 + if (NS_FAILED(rv)) return rv;
1.657 +
1.658 + // Now write out resources (which might have their own
1.659 + // substructure) as children.
1.660 + mDataSource->ArcLabelsOut(aResource, getter_AddRefs(arcs));
1.661 +
1.662 + if (arcs) {
1.663 + // Forget that we've visited anything
1.664 + visited.Clear();
1.665 + // ... except for rdf:type
1.666 + if (isTypedNode)
1.667 + visited.AppendElement(kRDF_type);
1.668 +
1.669 + while (1) {
1.670 + bool hasMore = false;
1.671 + arcs->HasMoreElements(&hasMore);
1.672 + if (! hasMore)
1.673 + break;
1.674 +
1.675 + nsCOMPtr<nsISupports> isupports;
1.676 + arcs->GetNext(getter_AddRefs(isupports));
1.677 +
1.678 + nsCOMPtr<nsIRDFResource> property = do_QueryInterface(isupports);
1.679 + if (! property)
1.680 + continue;
1.681 +
1.682 + // Ignore properties that pertain to containers; we may be
1.683 + // called from SerializeContainer() if the container
1.684 + // resource has been assigned non-container properties.
1.685 + if (IsContainerProperty(property))
1.686 + continue;
1.687 +
1.688 + // have we already seen this property? If so, don't write it
1.689 + // out again; serialize property will write each instance.
1.690 + if (visited.Contains(property.get()))
1.691 + continue;
1.692 +
1.693 + visited.AppendElement(property.get());
1.694 +
1.695 + SerializeProperty(aStream, aResource, property, false, &skipped);
1.696 + }
1.697 + }
1.698 +
1.699 + // Emit a proper close-tag.
1.700 + if (isTypedNode) {
1.701 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(" </"));
1.702 + if (NS_FAILED(rv)) return rv;
1.703 + // Watch out for the default namespace!
1.704 + rdf_BlockingWrite(aStream, typeQName);
1.705 + if (NS_FAILED(rv)) return rv;
1.706 + rdf_BlockingWrite(aStream, ">\n", 2);
1.707 + if (NS_FAILED(rv)) return rv;
1.708 + }
1.709 + else {
1.710 + rv = rdf_BlockingWrite(aStream, kRDFDescriptionClose,
1.711 + sizeof(kRDFDescriptionClose) - 1);
1.712 + if (NS_FAILED(rv)) return rv;
1.713 + }
1.714 + }
1.715 + else {
1.716 + // If we saw _no_ child properties, then we can don't need a
1.717 + // close-tag.
1.718 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(" />\n"));
1.719 + if (NS_FAILED(rv)) return rv;
1.720 + }
1.721 +
1.722 + return NS_OK;
1.723 +}
1.724 +
1.725 +nsresult
1.726 +nsRDFXMLSerializer::SerializeMember(nsIOutputStream* aStream,
1.727 + nsIRDFResource* aContainer,
1.728 + nsIRDFNode* aMember)
1.729 +{
1.730 + // If it's a resource, then output a "<RDF:li RDF:resource=... />"
1.731 + // tag, because we'll be dumping the resource separately. (We
1.732 + // iterate thru all the resources in the datasource,
1.733 + // remember?) Otherwise, output the literal value.
1.734 +
1.735 + nsCOMPtr<nsIRDFResource> resource;
1.736 + nsCOMPtr<nsIRDFLiteral> literal;
1.737 + nsCOMPtr<nsIRDFInt> number;
1.738 + nsCOMPtr<nsIRDFDate> date;
1.739 +
1.740 +static const char kRDFLIOpen[] = " <RDF:li";
1.741 + nsresult rv = rdf_BlockingWrite(aStream, kRDFLIOpen,
1.742 + sizeof(kRDFLIOpen) - 1);
1.743 + if (NS_FAILED(rv)) return rv;
1.744 +
1.745 + if ((resource = do_QueryInterface(aMember)) != nullptr) {
1.746 + nsAutoCString uri;
1.747 + resource->GetValueUTF8(uri);
1.748 +
1.749 + rdf_MakeRelativeRef(mBaseURLSpec, uri);
1.750 + rdf_EscapeAttributeValue(uri);
1.751 +
1.752 + rv = rdf_BlockingWrite(aStream, kRDFResource1,
1.753 + sizeof(kRDFResource1) - 1);
1.754 + if (NS_FAILED(rv)) return rv;
1.755 + rv = rdf_BlockingWrite(aStream, uri);
1.756 + if (NS_FAILED(rv)) return rv;
1.757 + rv = rdf_BlockingWrite(aStream, kRDFResource2,
1.758 + sizeof(kRDFResource2) - 1);
1.759 + if (NS_FAILED(rv)) return rv;
1.760 +
1.761 + goto no_close_tag;
1.762 + }
1.763 + else if ((literal = do_QueryInterface(aMember)) != nullptr) {
1.764 + const char16_t *value;
1.765 + literal->GetValueConst(&value);
1.766 +static const char kRDFLIOpenGT[] = ">";
1.767 + // close the '<RDF:LI' before adding the literal
1.768 + rv = rdf_BlockingWrite(aStream, kRDFLIOpenGT,
1.769 + sizeof(kRDFLIOpenGT) - 1);
1.770 + if (NS_FAILED(rv)) return rv;
1.771 +
1.772 + NS_ConvertUTF16toUTF8 s(value);
1.773 + rdf_EscapeAmpersandsAndAngleBrackets(s);
1.774 +
1.775 + rv = rdf_BlockingWrite(aStream, s);
1.776 + if (NS_FAILED(rv)) return rv;
1.777 + }
1.778 + else if ((number = do_QueryInterface(aMember)) != nullptr) {
1.779 + int32_t value;
1.780 + number->GetValue(&value);
1.781 +
1.782 + nsAutoCString n;
1.783 + n.AppendInt(value);
1.784 +
1.785 + rv = rdf_BlockingWrite(aStream, kRDFParseTypeInteger,
1.786 + sizeof(kRDFParseTypeInteger) - 1);
1.787 + if (NS_FAILED(rv)) return rv;
1.788 + rv = rdf_BlockingWrite(aStream, n);
1.789 + if (NS_FAILED(rv)) return rv;
1.790 + }
1.791 + else if ((date = do_QueryInterface(aMember)) != nullptr) {
1.792 + PRTime value;
1.793 + date->GetValue(&value);
1.794 +
1.795 + nsAutoCString s;
1.796 + rdf_FormatDate(value, s);
1.797 +
1.798 + rv = rdf_BlockingWrite(aStream, kRDFParseTypeDate,
1.799 + sizeof(kRDFParseTypeDate) - 1);
1.800 + if (NS_FAILED(rv)) return rv;
1.801 + rv = rdf_BlockingWrite(aStream, s);
1.802 + if (NS_FAILED(rv)) return rv;
1.803 + }
1.804 + else {
1.805 + // XXX it doesn't support nsIRDFResource _or_ nsIRDFLiteral???
1.806 + // We should serialize nsIRDFInt, nsIRDFDate, etc...
1.807 + NS_WARNING("unknown RDF node type");
1.808 +
1.809 + rv = rdf_BlockingWrite(aStream, kRDFUnknown, sizeof(kRDFUnknown) - 1);
1.810 + if (NS_FAILED(rv)) return rv;
1.811 + }
1.812 +
1.813 + {
1.814 +static const char kRDFLIClose[] = "</RDF:li>\n";
1.815 + rv = rdf_BlockingWrite(aStream, kRDFLIClose, sizeof(kRDFLIClose) - 1);
1.816 + if (NS_FAILED(rv)) return rv;
1.817 + }
1.818 +
1.819 + no_close_tag:
1.820 + return NS_OK;
1.821 +}
1.822 +
1.823 +
1.824 +nsresult
1.825 +nsRDFXMLSerializer::SerializeContainer(nsIOutputStream* aStream,
1.826 + nsIRDFResource* aContainer)
1.827 +{
1.828 + nsresult rv;
1.829 + nsAutoCString tag;
1.830 +
1.831 + // Decide if it's a sequence, bag, or alternation, and print the
1.832 + // appropriate tag-open sequence
1.833 +
1.834 + if (IsA(mDataSource, aContainer, kRDF_Bag)) {
1.835 + tag.AssignLiteral("RDF:Bag");
1.836 + }
1.837 + else if (IsA(mDataSource, aContainer, kRDF_Seq)) {
1.838 + tag.AssignLiteral("RDF:Seq");
1.839 + }
1.840 + else if (IsA(mDataSource, aContainer, kRDF_Alt)) {
1.841 + tag.AssignLiteral("RDF:Alt");
1.842 + }
1.843 + else {
1.844 + NS_ASSERTION(false, "huh? this is _not_ a container.");
1.845 + return NS_ERROR_UNEXPECTED;
1.846 + }
1.847 +
1.848 + rv = rdf_BlockingWrite(aStream, " <", 3);
1.849 + if (NS_FAILED(rv)) return rv;
1.850 + rv = rdf_BlockingWrite(aStream, tag);
1.851 + if (NS_FAILED(rv)) return rv;
1.852 +
1.853 +
1.854 + // Unfortunately, we always need to print out the identity of the
1.855 + // resource, even if was constructed "anonymously". We need to do
1.856 + // this because we never really know who else might be referring
1.857 + // to it...
1.858 +
1.859 + nsAutoCString uri;
1.860 + if (NS_SUCCEEDED(aContainer->GetValueUTF8(uri))) {
1.861 + rdf_MakeRelativeRef(mBaseURLSpec, uri);
1.862 +
1.863 + rdf_EscapeAttributeValue(uri);
1.864 +
1.865 + if (uri.First() == '#') {
1.866 + // Okay, it's actually identified as an element in the
1.867 + // current document, not trying to decorate some absolute
1.868 + // URI. We can use the 'ID=' attribute...
1.869 +
1.870 + uri.Cut(0, 1); // chop the '#'
1.871 + rv = rdf_BlockingWrite(aStream, kIDAttr, sizeof(kIDAttr) - 1);
1.872 + if (NS_FAILED(rv)) return rv;
1.873 + }
1.874 + else {
1.875 + // We need to cheat and spit out an illegal 'about=' on
1.876 + // the sequence.
1.877 + rv = rdf_BlockingWrite(aStream, kAboutAttr,
1.878 + sizeof(kAboutAttr) - 1);
1.879 + if (NS_FAILED(rv)) return rv;
1.880 + }
1.881 +
1.882 + rv = rdf_BlockingWrite(aStream, uri);
1.883 + if (NS_FAILED(rv)) return rv;
1.884 + rv = rdf_BlockingWrite(aStream, "\"", 1);
1.885 + if (NS_FAILED(rv)) return rv;
1.886 + }
1.887 +
1.888 + rv = rdf_BlockingWrite(aStream, ">\n", 2);
1.889 + if (NS_FAILED(rv)) return rv;
1.890 +
1.891 + // First iterate through each of the ordinal elements (the RDF/XML
1.892 + // syntax doesn't allow us to place properties on RDF container
1.893 + // elements).
1.894 + nsCOMPtr<nsISimpleEnumerator> elements;
1.895 + rv = NS_NewContainerEnumerator(mDataSource, aContainer, getter_AddRefs(elements));
1.896 +
1.897 + if (NS_SUCCEEDED(rv)) {
1.898 + while (1) {
1.899 + bool hasMore;
1.900 + rv = elements->HasMoreElements(&hasMore);
1.901 + if (NS_FAILED(rv)) break;
1.902 +
1.903 + if (! hasMore)
1.904 + break;
1.905 +
1.906 + nsCOMPtr<nsISupports> isupports;
1.907 + elements->GetNext(getter_AddRefs(isupports));
1.908 +
1.909 + nsCOMPtr<nsIRDFNode> element = do_QueryInterface(isupports);
1.910 + NS_ASSERTION(element != nullptr, "not an nsIRDFNode");
1.911 + if (! element)
1.912 + continue;
1.913 +
1.914 + SerializeMember(aStream, aContainer, element);
1.915 + }
1.916 + }
1.917 +
1.918 + // close the container tag
1.919 + rv = rdf_BlockingWrite(aStream, " </", 4);
1.920 + if (NS_FAILED(rv)) return rv;
1.921 + tag.Append(">\n", 2);
1.922 + rv = rdf_BlockingWrite(aStream, tag);
1.923 + if (NS_FAILED(rv)) return rv;
1.924 +
1.925 + // Now, we iterate through _all_ of the arcs, in case someone has
1.926 + // applied properties to the bag itself. These'll be placed in a
1.927 + // separate RDF:Description element.
1.928 + nsCOMPtr<nsISimpleEnumerator> arcs;
1.929 + mDataSource->ArcLabelsOut(aContainer, getter_AddRefs(arcs));
1.930 +
1.931 + bool wroteDescription = false;
1.932 + while (! wroteDescription) {
1.933 + bool hasMore = false;
1.934 + rv = arcs->HasMoreElements(&hasMore);
1.935 + if (NS_FAILED(rv)) break;
1.936 +
1.937 + if (! hasMore)
1.938 + break;
1.939 +
1.940 + nsIRDFResource* property;
1.941 + rv = arcs->GetNext((nsISupports**) &property);
1.942 + if (NS_FAILED(rv)) break;
1.943 +
1.944 + // If it's a membership property, then output a "LI"
1.945 + // tag. Otherwise, output a property.
1.946 + if (! IsContainerProperty(property)) {
1.947 + rv = SerializeDescription(aStream, aContainer);
1.948 + wroteDescription = true;
1.949 + }
1.950 +
1.951 + NS_RELEASE(property);
1.952 + if (NS_FAILED(rv))
1.953 + break;
1.954 + }
1.955 +
1.956 + return NS_OK;
1.957 +}
1.958 +
1.959 +
1.960 +nsresult
1.961 +nsRDFXMLSerializer::SerializePrologue(nsIOutputStream* aStream)
1.962 +{
1.963 +static const char kXMLVersion[] = "<?xml version=\"1.0\"?>\n";
1.964 +
1.965 + nsresult rv;
1.966 + rv = rdf_BlockingWrite(aStream, kXMLVersion, sizeof(kXMLVersion) - 1);
1.967 + if (NS_FAILED(rv)) return rv;
1.968 +
1.969 + // global name space declarations
1.970 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("<RDF:RDF "));
1.971 + if (NS_FAILED(rv)) return rv;
1.972 +
1.973 + nsNameSpaceMap::const_iterator first = mNameSpaces.first();
1.974 + nsNameSpaceMap::const_iterator last = mNameSpaces.last();
1.975 + for (nsNameSpaceMap::const_iterator entry = first; entry != last; ++entry) {
1.976 + if (entry != first) {
1.977 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("\n "));
1.978 + if (NS_FAILED(rv)) return rv;
1.979 + }
1.980 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("xmlns"));
1.981 + if (NS_FAILED(rv)) return rv;
1.982 +
1.983 + if (entry->mPrefix) {
1.984 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(":"));
1.985 + if (NS_FAILED(rv)) return rv;
1.986 + nsAutoCString prefix;
1.987 + entry->mPrefix->ToUTF8String(prefix);
1.988 + rv = rdf_BlockingWrite(aStream, prefix);
1.989 + if (NS_FAILED(rv)) return rv;
1.990 + }
1.991 +
1.992 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("=\""));
1.993 + if (NS_FAILED(rv)) return rv;
1.994 + nsAutoCString uri(entry->mURI);
1.995 + rdf_EscapeAttributeValue(uri);
1.996 + rv = rdf_BlockingWrite(aStream, uri);
1.997 + if (NS_FAILED(rv)) return rv;
1.998 + rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("\""));
1.999 + if (NS_FAILED(rv)) return rv;
1.1000 + }
1.1001 +
1.1002 + return rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(">\n"));
1.1003 +}
1.1004 +
1.1005 +
1.1006 +nsresult
1.1007 +nsRDFXMLSerializer::SerializeEpilogue(nsIOutputStream* aStream)
1.1008 +{
1.1009 + return rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("</RDF:RDF>\n"));
1.1010 +}
1.1011 +
1.1012 +class QNameCollector MOZ_FINAL : public rdfITripleVisitor {
1.1013 +public:
1.1014 + NS_DECL_ISUPPORTS
1.1015 + NS_DECL_RDFITRIPLEVISITOR
1.1016 + QNameCollector(nsRDFXMLSerializer* aParent)
1.1017 + : mParent(aParent){}
1.1018 +private:
1.1019 + nsRDFXMLSerializer* mParent;
1.1020 +};
1.1021 +
1.1022 +NS_IMPL_ISUPPORTS(QNameCollector, rdfITripleVisitor)
1.1023 +nsresult
1.1024 +QNameCollector::Visit(nsIRDFNode* aSubject, nsIRDFResource* aPredicate,
1.1025 + nsIRDFNode* aObject, bool aTruthValue)
1.1026 +{
1.1027 + if (aPredicate == mParent->kRDF_type) {
1.1028 + // try to get a type QName for aObject, should be a resource
1.1029 + nsCOMPtr<nsIRDFResource> resType = do_QueryInterface(aObject);
1.1030 + if (!resType) {
1.1031 + // ignore error
1.1032 + return NS_OK;
1.1033 + }
1.1034 + if (mParent->mQNames.Get(resType, nullptr)) {
1.1035 + return NS_OK;
1.1036 + }
1.1037 + mParent->RegisterQName(resType);
1.1038 + return NS_OK;
1.1039 + }
1.1040 +
1.1041 + if (mParent->mQNames.Get(aPredicate, nullptr)) {
1.1042 + return NS_OK;
1.1043 + }
1.1044 + if (aPredicate == mParent->kRDF_instanceOf ||
1.1045 + aPredicate == mParent->kRDF_nextVal)
1.1046 + return NS_OK;
1.1047 + bool isOrdinal = false;
1.1048 + mParent->gRDFC->IsOrdinalProperty(aPredicate, &isOrdinal);
1.1049 + if (isOrdinal)
1.1050 + return NS_OK;
1.1051 +
1.1052 + mParent->RegisterQName(aPredicate);
1.1053 +
1.1054 + return NS_OK;
1.1055 +}
1.1056 +
1.1057 +nsresult
1.1058 +nsRDFXMLSerializer::CollectNamespaces()
1.1059 +{
1.1060 + // Iterate over all Triples to get namespaces for subject resource types
1.1061 + // and Predicates and cache all the QNames we want to use.
1.1062 + nsCOMPtr<rdfITripleVisitor> collector =
1.1063 + new QNameCollector(this);
1.1064 + nsCOMPtr<rdfIDataSource> ds = do_QueryInterface(mDataSource); // XXX API
1.1065 + NS_ENSURE_TRUE(collector && ds, NS_ERROR_FAILURE);
1.1066 + return ds->VisitAllTriples(collector);
1.1067 +}
1.1068 +
1.1069 +//----------------------------------------------------------------------
1.1070 +
1.1071 +NS_IMETHODIMP
1.1072 +nsRDFXMLSerializer::Serialize(nsIOutputStream* aStream)
1.1073 +{
1.1074 + nsresult rv;
1.1075 +
1.1076 + rv = CollectNamespaces();
1.1077 + if (NS_FAILED(rv)) return rv;
1.1078 +
1.1079 + nsCOMPtr<nsISimpleEnumerator> resources;
1.1080 + rv = mDataSource->GetAllResources(getter_AddRefs(resources));
1.1081 + if (NS_FAILED(rv)) return rv;
1.1082 +
1.1083 + rv = SerializePrologue(aStream);
1.1084 + if (NS_FAILED(rv))
1.1085 + return rv;
1.1086 +
1.1087 + while (1) {
1.1088 + bool hasMore = false;
1.1089 + resources->HasMoreElements(&hasMore);
1.1090 + if (! hasMore)
1.1091 + break;
1.1092 +
1.1093 + nsCOMPtr<nsISupports> isupports;
1.1094 + resources->GetNext(getter_AddRefs(isupports));
1.1095 +
1.1096 + nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(isupports);
1.1097 + if (! resource)
1.1098 + continue;
1.1099 +
1.1100 + if (IsA(mDataSource, resource, kRDF_Bag) ||
1.1101 + IsA(mDataSource, resource, kRDF_Seq) ||
1.1102 + IsA(mDataSource, resource, kRDF_Alt)) {
1.1103 + rv = SerializeContainer(aStream, resource);
1.1104 + }
1.1105 + else {
1.1106 + rv = SerializeDescription(aStream, resource);
1.1107 + }
1.1108 +
1.1109 + if (NS_FAILED(rv))
1.1110 + break;
1.1111 + }
1.1112 +
1.1113 + rv = SerializeEpilogue(aStream);
1.1114 +
1.1115 + return rv;
1.1116 +}
1.1117 +
1.1118 +
1.1119 +bool
1.1120 +nsRDFXMLSerializer::IsA(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType)
1.1121 +{
1.1122 + nsresult rv;
1.1123 +
1.1124 + bool result;
1.1125 + rv = aDataSource->HasAssertion(aResource, kRDF_instanceOf, aType, true, &result);
1.1126 + if (NS_FAILED(rv)) return false;
1.1127 +
1.1128 + return result;
1.1129 +}
