NS_IMETHODIMP
nsRDFXMLSerializer::Serialize(nsIOutputStream* aStream)
{
nsresult rv;
NS_TIMELINE_START_TIMER("rdf/xml-ser");
rv = CollectNamespaces();
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsISimpleEnumerator> resources;
rv = mDataSource->GetAllResources(getter_AddRefs(resources));
if (NS_FAILED(rv)) return rv;
rv = SerializePrologue(aStream);
if (NS_FAILED(rv))
return rv;
while (1) {
PRBool hasMore = PR_FALSE;
resources->HasMoreElements(&hasMore);
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
resources->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(isupports);
if (! resource)
continue;
if (IsA(mDataSource, resource, kRDF_Bag) ||
IsA(mDataSource, resource, kRDF_Seq) ||
IsA(mDataSource, resource, kRDF_Alt)) {
rv = SerializeContainer(aStream, resource);
}
else {
rv = SerializeDescription(aStream, resource);
}
if (NS_FAILED(rv))
break;
}
rv = SerializeEpilogue(aStream);
NS_TIMELINE_STOP_TIMER("rdf/xml-ser");
NS_TIMELINE_MARK("rdf/xml-ser");
return rv;
}
nsresult
nsRDFXMLSerializer::SerializeContainer(nsIOutputStream* aStream,
nsIRDFResource* aContainer)
{
nsresult rv;
nsAutoCString tag;
// Decide if it's a sequence, bag, or alternation, and print the
// appropriate tag-open sequence
if (IsA(mDataSource, aContainer, kRDF_Bag)) {
tag.AssignLiteral("RDF:Bag");
}
else if (IsA(mDataSource, aContainer, kRDF_Seq)) {
tag.AssignLiteral("RDF:Seq");
}
else if (IsA(mDataSource, aContainer, kRDF_Alt)) {
tag.AssignLiteral("RDF:Alt");
}
else {
NS_ASSERTION(false, "huh? this is _not_ a container.");
return NS_ERROR_UNEXPECTED;
}
rv = rdf_BlockingWrite(aStream, " <", 3);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, tag);
if (NS_FAILED(rv)) return rv;
// Unfortunately, we always need to print out the identity of the
// resource, even if was constructed "anonymously". We need to do
// this because we never really know who else might be referring
// to it...
nsAutoCString uri;
if (NS_SUCCEEDED(aContainer->GetValueUTF8(uri))) {
rdf_MakeRelativeRef(mBaseURLSpec, uri);
rdf_EscapeAttributeValue(uri);
if (uri.First() == '#') {
// Okay, it's actually identified as an element in the
// current document, not trying to decorate some absolute
// URI. We can use the 'ID=' attribute...
uri.Cut(0, 1); // chop the '#'
rv = rdf_BlockingWrite(aStream, kIDAttr, sizeof(kIDAttr) - 1);
if (NS_FAILED(rv)) return rv;
}
else {
// We need to cheat and spit out an illegal 'about=' on
// the sequence.
rv = rdf_BlockingWrite(aStream, kAboutAttr,
sizeof(kAboutAttr) - 1);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, "\"", 1);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, ">\n", 2);
if (NS_FAILED(rv)) return rv;
// First iterate through each of the ordinal elements (the RDF/XML
// syntax doesn't allow us to place properties on RDF container
// elements).
nsCOMPtr<nsISimpleEnumerator> elements;
rv = NS_NewContainerEnumerator(mDataSource, aContainer, getter_AddRefs(elements));
if (NS_SUCCEEDED(rv)) {
while (1) {
bool hasMore;
rv = elements->HasMoreElements(&hasMore);
if (NS_FAILED(rv)) break;
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
elements->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFNode> element = do_QueryInterface(isupports);
NS_ASSERTION(element != nullptr, "not an nsIRDFNode");
if (! element)
continue;
SerializeMember(aStream, aContainer, element);
}
}
// close the container tag
rv = rdf_BlockingWrite(aStream, " </", 4);
if (NS_FAILED(rv)) return rv;
tag.Append(">\n", 2);
rv = rdf_BlockingWrite(aStream, tag);
if (NS_FAILED(rv)) return rv;
// Now, we iterate through _all_ of the arcs, in case someone has
// applied properties to the bag itself. These'll be placed in a
// separate RDF:Description element.
nsCOMPtr<nsISimpleEnumerator> arcs;
mDataSource->ArcLabelsOut(aContainer, getter_AddRefs(arcs));
bool wroteDescription = false;
while (! wroteDescription) {
bool hasMore = false;
rv = arcs->HasMoreElements(&hasMore);
if (NS_FAILED(rv)) break;
if (! hasMore)
break;
nsIRDFResource* property;
rv = arcs->GetNext((nsISupports**) &property);
if (NS_FAILED(rv)) break;
// If it's a membership property, then output a "LI"
// tag. Otherwise, output a property.
if (! IsContainerProperty(property)) {
rv = SerializeDescription(aStream, aContainer);
wroteDescription = true;
}
NS_RELEASE(property);
if (NS_FAILED(rv))
break;
}
return NS_OK;
}
