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