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rdfTriplesSerializer.cpp
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rdfTriplesSerializer.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.
*
* The Initial Developer of the Original Code is
* Axel Hecht.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Axel Hecht <axel@pike.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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"
class TriplesVisitor : public rdfITripleVisitor
{
public:
TriplesVisitor(nsIOutputStream* aOut) : mOut(aOut) {}
NS_DECL_RDFITRIPLEVISITOR
NS_DECL_ISUPPORTS
protected:
nsresult writeResource(nsIRDFResource* aResource);
nsIOutputStream* mOut;
};
NS_IMPL_ISUPPORTS1(TriplesVisitor, rdfITripleVisitor)
nsresult
TriplesVisitor::writeResource(nsIRDFResource *aResource)
{
nsCString res;
PRUint32 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, PRBool 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;
PRUint32 wroteCount;
if (res) {
rv = writeResource(res);
} else if ((lit = do_QueryInterface(aObject)) != nsnull) {
const PRUnichar *value;
lit->GetValueConst(&value);
nsCAutoString object;
object.AppendLiteral("\"");
AppendUTF16toUTF8(value, object);
object.AppendLiteral("\" ");
PRUint32 writeCount = object.Length();
rv = mOut->Write(object.get(), writeCount, &wroteCount);
NS_ENSURE_TRUE(writeCount == wroteCount, NS_ERROR_FAILURE);
} else if ((intLit = do_QueryInterface(aObject)) != nsnull) {
PRInt32 value;
intLit->GetValue(&value);
nsPrintfCString
object(128,
"\"%i\"^^<http://www.w3.org/2001/XMLSchema#integer> ",
value);
PRUint32 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 : public rdfISerializer
{
public:
NS_DECL_ISUPPORTS
NS_DECL_RDFISERIALIZER
rdfTriplesSerializer();
private:
~rdfTriplesSerializer();
};
nsresult
NS_NewTriplesSerializer(rdfISerializer** aResult)
{
NS_PRECONDITION(aResult != nsnull, "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_ISUPPORTS1(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);
}