The Tor Browser: rdf/base/src/rdfTriplesSerializer.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsIOutputStream.h"

     7 #include "nsReadableUtils.h"

     8 #include "nsCRT.h"

     9 #include "nsCOMPtr.h"

    10 #include "nsString.h"

    11 #include "nsPrintfCString.h"

    12 #include "nsIBufferedStreams.h"

    13 #include "nsNetCID.h"

    14 #include "nsComponentManagerUtils.h"

    16 #include "rdfISerializer.h"

    17 #include "rdfIDataSource.h"

    18 #include "rdfITripleVisitor.h"

    20 #include "nsIRDFResource.h"

    21 #include "nsIRDFLiteral.h"

    22 #include "mozilla/Attributes.h"

    24 class TriplesVisitor MOZ_FINAL : public rdfITripleVisitor

    25 {

    26 public:

    27     TriplesVisitor(nsIOutputStream* aOut) : mOut(aOut) {}

    28     NS_DECL_RDFITRIPLEVISITOR

    29     NS_DECL_ISUPPORTS

    30 protected:

    31     nsresult writeResource(nsIRDFResource* aResource);

    32     nsIOutputStream* mOut;

    33 };

    35 NS_IMPL_ISUPPORTS(TriplesVisitor, rdfITripleVisitor)

    37 nsresult

    38 TriplesVisitor::writeResource(nsIRDFResource *aResource)

    39 {

    40     nsCString res;

    41     uint32_t writeCount, wroteCount;

    42     mOut->Write("<", 1, &wroteCount);

    43     NS_ENSURE_TRUE(wroteCount == 1, NS_ERROR_FAILURE);

    44     nsresult rv = aResource->GetValueUTF8(res);

    45     NS_ENSURE_SUCCESS(rv, rv);

    46     writeCount = res.Length();

    47     mOut->Write(res.get(), writeCount, &wroteCount);

    48     NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);

    49     mOut->Write("> ", 2, &wroteCount);

    50     NS_ENSURE_TRUE(wroteCount == 2, NS_ERROR_FAILURE);

    51     return NS_OK;

    52 }

    54 NS_IMETHODIMP

    55 TriplesVisitor::Visit(nsIRDFNode *aSubject, nsIRDFResource *aPredicate,

    56                       nsIRDFNode *aObject, bool aTruthValue)

    57 {

    58     nsCOMPtr<nsIRDFResource> subjectRes = do_QueryInterface(aSubject);

    59     nsresult rv = NS_OK;

    60     if (subjectRes) {

    61         rv = writeResource(subjectRes);

    62     }

    63     if (NS_FAILED(rv)) {

    64         return rv;

    65     }

    66     rv = writeResource(aPredicate);

    67     if (NS_FAILED(rv)) {

    68         return rv;

    69     }

    70     nsCOMPtr<nsIRDFResource> res = do_QueryInterface(aObject);

    71     nsCOMPtr<nsIRDFLiteral> lit;

    72     nsCOMPtr<nsIRDFInt> intLit;

    73     uint32_t wroteCount;

    74     if (res) {

    75         rv = writeResource(res);

    76     } else if ((lit = do_QueryInterface(aObject)) != nullptr) {

    77         const char16_t *value;

    78         lit->GetValueConst(&value);

    79         nsAutoCString object;

    80         object.AppendLiteral("\"");

    81         AppendUTF16toUTF8(value, object);

    82         object.AppendLiteral("\" ");

    83         uint32_t writeCount = object.Length();

    84         rv = mOut->Write(object.get(), writeCount, &wroteCount);

    85         NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);

    86     } else if ((intLit = do_QueryInterface(aObject)) != nullptr) {

    87         int32_t value;

    88         intLit->GetValue(&value);

    89         nsPrintfCString

    90             object("\"%i\"^^<http://www.w3.org/2001/XMLSchema#integer> ",

    91                    value);

    92         uint32_t writeCount = object.Length();

    93         rv = mOut->Write(object.get(), writeCount, &wroteCount);

    94         NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);

    95     }

    96     NS_ENSURE_SUCCESS(rv, rv);

    97     return mOut->Write(".\n", 2, &wroteCount);

    98 }

   100 class rdfTriplesSerializer MOZ_FINAL : public rdfISerializer

   101 {

   102 public:

   103   NS_DECL_ISUPPORTS

   104   NS_DECL_RDFISERIALIZER

   106   rdfTriplesSerializer();

   108 private:

   109   ~rdfTriplesSerializer();

   111 };

   113 nsresult

   114 NS_NewTriplesSerializer(rdfISerializer** aResult)

   115 {

   116     NS_PRECONDITION(aResult != nullptr, "null ptr");

   117     if (! aResult)

   118         return NS_ERROR_NULL_POINTER;

   120     *aResult = new rdfTriplesSerializer();

   121     if (! *aResult)

   122         return NS_ERROR_OUT_OF_MEMORY;

   123     NS_ADDREF(*aResult);

   124     return NS_OK;

   125 }

   127 NS_IMPL_ISUPPORTS(rdfTriplesSerializer, rdfISerializer)

   129 rdfTriplesSerializer::rdfTriplesSerializer()

   130 {

   131 }

   133 rdfTriplesSerializer::~rdfTriplesSerializer()

   134 {

   135 }

   137 NS_IMETHODIMP

   138 rdfTriplesSerializer::Serialize(rdfIDataSource *aDataSource,

   139                                 nsIOutputStream *aOut)

   140 {

   141     nsresult rv;

   142     nsCOMPtr<nsIBufferedOutputStream> bufout =

   143         do_CreateInstance(NS_BUFFEREDOUTPUTSTREAM_CONTRACTID, &rv);

   144     NS_ENSURE_SUCCESS(rv, rv);

   145     rv = bufout->Init(aOut, 1024);

   146     NS_ENSURE_SUCCESS(rv, rv);

   147     nsCOMPtr<rdfITripleVisitor> tv = new TriplesVisitor(bufout);

   148     NS_ENSURE_TRUE(tv, NS_ERROR_OUT_OF_MEMORY);

   149     return aDataSource->VisitAllTriples(tv);

   150 }

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