diff -r 000000000000 -r 6474c204b198 rdf/base/src/rdfTriplesSerializer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rdf/base/src/rdfTriplesSerializer.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIOutputStream.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsPrintfCString.h"
+#include "nsIBufferedStreams.h"
+#include "nsNetCID.h"
+#include "nsComponentManagerUtils.h"
+
+#include "rdfISerializer.h"
+#include "rdfIDataSource.h"
+#include "rdfITripleVisitor.h"
+
+#include "nsIRDFResource.h"
+#include "nsIRDFLiteral.h"
+#include "mozilla/Attributes.h"
+
+class TriplesVisitor MOZ_FINAL : public rdfITripleVisitor
+{
+public:
+    TriplesVisitor(nsIOutputStream* aOut) : mOut(aOut) {}
+    NS_DECL_RDFITRIPLEVISITOR
+    NS_DECL_ISUPPORTS
+protected:
+    nsresult writeResource(nsIRDFResource* aResource);
+    nsIOutputStream* mOut;
+};
+
+NS_IMPL_ISUPPORTS(TriplesVisitor, rdfITripleVisitor)
+
+nsresult
+TriplesVisitor::writeResource(nsIRDFResource *aResource)
+{
+    nsCString res;
+    uint32_t writeCount, wroteCount;
+    mOut->Write("<", 1, &wroteCount);
+    NS_ENSURE_TRUE(wroteCount == 1, NS_ERROR_FAILURE);
+    nsresult rv = aResource->GetValueUTF8(res);
+    NS_ENSURE_SUCCESS(rv, rv);
+    writeCount = res.Length();
+    mOut->Write(res.get(), writeCount, &wroteCount);
+    NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);
+    mOut->Write("> ", 2, &wroteCount);
+    NS_ENSURE_TRUE(wroteCount == 2, NS_ERROR_FAILURE);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+TriplesVisitor::Visit(nsIRDFNode *aSubject, nsIRDFResource *aPredicate,
+                      nsIRDFNode *aObject, bool aTruthValue)
+{
+    nsCOMPtr<nsIRDFResource> subjectRes = do_QueryInterface(aSubject);
+    nsresult rv = NS_OK;
+    if (subjectRes) {
+        rv = writeResource(subjectRes);
+    }
+    if (NS_FAILED(rv)) {
+        return rv;
+    }
+    rv = writeResource(aPredicate);
+    if (NS_FAILED(rv)) {
+        return rv;
+    }
+    nsCOMPtr<nsIRDFResource> res = do_QueryInterface(aObject);
+    nsCOMPtr<nsIRDFLiteral> lit;
+    nsCOMPtr<nsIRDFInt> intLit;
+    uint32_t wroteCount;
+    if (res) {
+        rv = writeResource(res);
+    } else if ((lit = do_QueryInterface(aObject)) != nullptr) {
+        const char16_t *value;
+        lit->GetValueConst(&value);
+        nsAutoCString object;
+        object.AppendLiteral("\"");
+        AppendUTF16toUTF8(value, object);
+        object.AppendLiteral("\" ");
+        uint32_t writeCount = object.Length();
+        rv = mOut->Write(object.get(), writeCount, &wroteCount);
+        NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);
+    } else if ((intLit = do_QueryInterface(aObject)) != nullptr) {
+        int32_t value;
+        intLit->GetValue(&value);
+        nsPrintfCString
+            object("\"%i\"^^<http://www.w3.org/2001/XMLSchema#integer> ",
+                   value);
+        uint32_t writeCount = object.Length();
+        rv = mOut->Write(object.get(), writeCount, &wroteCount);
+        NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);
+    }
+    NS_ENSURE_SUCCESS(rv, rv);
+    return mOut->Write(".\n", 2, &wroteCount);
+}
+
+class rdfTriplesSerializer MOZ_FINAL : public rdfISerializer
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_RDFISERIALIZER
+
+  rdfTriplesSerializer();
+
+private:
+  ~rdfTriplesSerializer();
+
+};
+
+nsresult
+NS_NewTriplesSerializer(rdfISerializer** aResult)
+{
+    NS_PRECONDITION(aResult != nullptr, "null ptr");
+    if (! aResult)
+        return NS_ERROR_NULL_POINTER;
+
+    *aResult = new rdfTriplesSerializer();
+    if (! *aResult)
+        return NS_ERROR_OUT_OF_MEMORY;
+    NS_ADDREF(*aResult);
+    return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(rdfTriplesSerializer, rdfISerializer)
+
+rdfTriplesSerializer::rdfTriplesSerializer()
+{
+}
+
+rdfTriplesSerializer::~rdfTriplesSerializer()
+{
+}
+
+NS_IMETHODIMP
+rdfTriplesSerializer::Serialize(rdfIDataSource *aDataSource,
+                                nsIOutputStream *aOut)
+{
+    nsresult rv;
+    nsCOMPtr<nsIBufferedOutputStream> bufout = 
+        do_CreateInstance(NS_BUFFEREDOUTPUTSTREAM_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = bufout->Init(aOut, 1024);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr<rdfITripleVisitor> tv = new TriplesVisitor(bufout);
+    NS_ENSURE_TRUE(tv, NS_ERROR_OUT_OF_MEMORY);
+    return aDataSource->VisitAllTriples(tv);
+}