diff options
Diffstat (limited to 'rdf/base/nsRDFContainerUtils.cpp')
| -rw-r--r-- | rdf/base/nsRDFContainerUtils.cpp | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/rdf/base/nsRDFContainerUtils.cpp b/rdf/base/nsRDFContainerUtils.cpp new file mode 100644 index 0000000000..299722d4be --- /dev/null +++ b/rdf/base/nsRDFContainerUtils.cpp @@ -0,0 +1,515 @@ +/* -*- 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/. */ + +/* + + Implementation for the RDF container utils. + + */ + + +#include "nsCOMPtr.h" +#include "nsIServiceManager.h" +#include "nsIRDFContainer.h" +#include "nsIRDFContainerUtils.h" +#include "nsIRDFService.h" +#include "nsRDFCID.h" +#include "nsString.h" +#include "nsXPIDLString.h" +#include "plstr.h" +#include "prprf.h" +#include "rdf.h" +#include "rdfutil.h" + +class RDFContainerUtilsImpl : public nsIRDFContainerUtils +{ +public: + // nsISupports interface + NS_DECL_ISUPPORTS + + // nsIRDFContainerUtils interface + NS_DECL_NSIRDFCONTAINERUTILS + +private: + friend nsresult NS_NewRDFContainerUtils(nsIRDFContainerUtils** aResult); + + RDFContainerUtilsImpl(); + virtual ~RDFContainerUtilsImpl(); + + nsresult MakeContainer(nsIRDFDataSource* aDataSource, + nsIRDFResource* aResource, + nsIRDFResource* aType, + nsIRDFContainer** aResult); + + bool IsA(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType); + + // pseudo constants + static int32_t gRefCnt; + static nsIRDFService* gRDFService; + static nsIRDFResource* kRDF_instanceOf; + static nsIRDFResource* kRDF_nextVal; + static nsIRDFResource* kRDF_Bag; + static nsIRDFResource* kRDF_Seq; + static nsIRDFResource* kRDF_Alt; + static nsIRDFLiteral* kOne; + static const char kRDFNameSpaceURI[]; +}; + +int32_t RDFContainerUtilsImpl::gRefCnt = 0; +nsIRDFService* RDFContainerUtilsImpl::gRDFService; +nsIRDFResource* RDFContainerUtilsImpl::kRDF_instanceOf; +nsIRDFResource* RDFContainerUtilsImpl::kRDF_nextVal; +nsIRDFResource* RDFContainerUtilsImpl::kRDF_Bag; +nsIRDFResource* RDFContainerUtilsImpl::kRDF_Seq; +nsIRDFResource* RDFContainerUtilsImpl::kRDF_Alt; +nsIRDFLiteral* RDFContainerUtilsImpl::kOne; +const char RDFContainerUtilsImpl::kRDFNameSpaceURI[] = RDF_NAMESPACE_URI; + +//////////////////////////////////////////////////////////////////////// +// nsISupports interface + +NS_IMPL_ISUPPORTS(RDFContainerUtilsImpl, nsIRDFContainerUtils) + +//////////////////////////////////////////////////////////////////////// +// nsIRDFContainerUtils interface + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsOrdinalProperty(nsIRDFResource *aProperty, bool *_retval) +{ + NS_PRECONDITION(aProperty != nullptr, "null ptr"); + if (! aProperty) + return NS_ERROR_NULL_POINTER; + + nsresult rv; + + const char *propertyStr; + rv = aProperty->GetValueConst( &propertyStr ); + if (NS_FAILED(rv)) return rv; + + if (PL_strncmp(propertyStr, kRDFNameSpaceURI, sizeof(kRDFNameSpaceURI) - 1) != 0) { + *_retval = false; + return NS_OK; + } + + const char* s = propertyStr; + s += sizeof(kRDFNameSpaceURI) - 1; + if (*s != '_') { + *_retval = false; + return NS_OK; + } + + ++s; + while (*s) { + if (*s < '0' || *s > '9') { + *_retval = false; + return NS_OK; + } + + ++s; + } + + *_retval = true; + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::IndexToOrdinalResource(int32_t aIndex, nsIRDFResource **aOrdinal) +{ + NS_PRECONDITION(aIndex > 0, "illegal value"); + if (aIndex <= 0) + return NS_ERROR_ILLEGAL_VALUE; + + nsAutoCString uri(kRDFNameSpaceURI); + uri.Append('_'); + uri.AppendInt(aIndex); + + nsresult rv = gRDFService->GetResource(uri, aOrdinal); + NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get ordinal resource"); + if (NS_FAILED(rv)) return rv; + + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::OrdinalResourceToIndex(nsIRDFResource *aOrdinal, int32_t *aIndex) +{ + NS_PRECONDITION(aOrdinal != nullptr, "null ptr"); + if (! aOrdinal) + return NS_ERROR_NULL_POINTER; + + const char *ordinalStr; + if (NS_FAILED(aOrdinal->GetValueConst( &ordinalStr ))) + return NS_ERROR_FAILURE; + + const char* s = ordinalStr; + if (PL_strncmp(s, kRDFNameSpaceURI, sizeof(kRDFNameSpaceURI) - 1) != 0) { + NS_ERROR("not an ordinal"); + return NS_ERROR_UNEXPECTED; + } + + s += sizeof(kRDFNameSpaceURI) - 1; + if (*s != '_') { + NS_ERROR("not an ordinal"); + return NS_ERROR_UNEXPECTED; + } + + int32_t idx = 0; + + ++s; + while (*s) { + if (*s < '0' || *s > '9') { + NS_ERROR("not an ordinal"); + return NS_ERROR_UNEXPECTED; + } + + idx *= 10; + idx += (*s - '0'); + + ++s; + } + + *aIndex = idx; + return NS_OK; +} + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsContainer(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, bool *_retval) +{ + NS_PRECONDITION(aDataSource != nullptr, "null ptr"); + if (! aDataSource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aResource != nullptr, "null ptr"); + if (! aResource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(_retval != nullptr, "null ptr"); + if (! _retval) + return NS_ERROR_NULL_POINTER; + + if (IsA(aDataSource, aResource, kRDF_Seq) || + IsA(aDataSource, aResource, kRDF_Bag) || + IsA(aDataSource, aResource, kRDF_Alt)) { + *_retval = true; + } + else { + *_retval = false; + } + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsEmpty(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, bool* _retval) +{ + if (! aDataSource) + return NS_ERROR_NULL_POINTER; + + nsresult rv; + + // By default, say that we're an empty container. Even if we're not + // really even a container. + *_retval = true; + + nsCOMPtr<nsIRDFNode> nextValNode; + rv = aDataSource->GetTarget(aResource, kRDF_nextVal, true, getter_AddRefs(nextValNode)); + if (NS_FAILED(rv)) return rv; + + if (rv == NS_RDF_NO_VALUE) + return NS_OK; + + nsCOMPtr<nsIRDFLiteral> nextValLiteral; + rv = nextValNode->QueryInterface(NS_GET_IID(nsIRDFLiteral), getter_AddRefs(nextValLiteral)); + if (NS_FAILED(rv)) return rv; + + if (nextValLiteral.get() != kOne) + *_retval = false; + + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsBag(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, bool *_retval) +{ + NS_PRECONDITION(aDataSource != nullptr, "null ptr"); + if (! aDataSource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aResource != nullptr, "null ptr"); + if (! aResource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(_retval != nullptr, "null ptr"); + if (! _retval) + return NS_ERROR_NULL_POINTER; + + *_retval = IsA(aDataSource, aResource, kRDF_Bag); + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsSeq(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, bool *_retval) +{ + NS_PRECONDITION(aDataSource != nullptr, "null ptr"); + if (! aDataSource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aResource != nullptr, "null ptr"); + if (! aResource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(_retval != nullptr, "null ptr"); + if (! _retval) + return NS_ERROR_NULL_POINTER; + + *_retval = IsA(aDataSource, aResource, kRDF_Seq); + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::IsAlt(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, bool *_retval) +{ + NS_PRECONDITION(aDataSource != nullptr, "null ptr"); + if (! aDataSource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aResource != nullptr, "null ptr"); + if (! aResource) + return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(_retval != nullptr, "null ptr"); + if (! _retval) + return NS_ERROR_NULL_POINTER; + + *_retval = IsA(aDataSource, aResource, kRDF_Alt); + return NS_OK; +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::MakeBag(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, nsIRDFContainer **_retval) +{ + return MakeContainer(aDataSource, aResource, kRDF_Bag, _retval); +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::MakeSeq(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, nsIRDFContainer **_retval) +{ + return MakeContainer(aDataSource, aResource, kRDF_Seq, _retval); +} + + +NS_IMETHODIMP +RDFContainerUtilsImpl::MakeAlt(nsIRDFDataSource *aDataSource, nsIRDFResource *aResource, nsIRDFContainer **_retval) +{ + return MakeContainer(aDataSource, aResource, kRDF_Alt, _retval); +} + + + +//////////////////////////////////////////////////////////////////////// + + +RDFContainerUtilsImpl::RDFContainerUtilsImpl() +{ + if (gRefCnt++ == 0) { + nsresult rv; + + NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID); + rv = CallGetService(kRDFServiceCID, &gRDFService); + + NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get RDF service"); + if (NS_SUCCEEDED(rv)) { + gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "instanceOf"), + &kRDF_instanceOf); + gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "nextVal"), + &kRDF_nextVal); + gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Bag"), + &kRDF_Bag); + gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Seq"), + &kRDF_Seq); + gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Alt"), + &kRDF_Alt); + gRDFService->GetLiteral(u"1", &kOne); + } + } +} + + +RDFContainerUtilsImpl::~RDFContainerUtilsImpl() +{ +#ifdef DEBUG_REFS + --gInstanceCount; + fprintf(stdout, "%d - RDF: RDFContainerUtilsImpl\n", gInstanceCount); +#endif + + if (--gRefCnt == 0) { + NS_IF_RELEASE(gRDFService); + NS_IF_RELEASE(kRDF_instanceOf); + NS_IF_RELEASE(kRDF_nextVal); + NS_IF_RELEASE(kRDF_Bag); + NS_IF_RELEASE(kRDF_Seq); + NS_IF_RELEASE(kRDF_Alt); + NS_IF_RELEASE(kOne); + } +} + + + +nsresult +NS_NewRDFContainerUtils(nsIRDFContainerUtils** aResult) +{ + NS_PRECONDITION(aResult != nullptr, "null ptr"); + if (! aResult) + return NS_ERROR_NULL_POINTER; + + RDFContainerUtilsImpl* result = + new RDFContainerUtilsImpl(); + + if (! result) + return NS_ERROR_OUT_OF_MEMORY; + + NS_ADDREF(result); + *aResult = result; + return NS_OK; +} + + +nsresult +RDFContainerUtilsImpl::MakeContainer(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType, nsIRDFContainer** aResult) +{ + NS_PRECONDITION(aDataSource != nullptr, "null ptr"); + if (! aDataSource) return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aResource != nullptr, "null ptr"); + if (! aResource) return NS_ERROR_NULL_POINTER; + + NS_PRECONDITION(aType != nullptr, "null ptr"); + if (! aType) return NS_ERROR_NULL_POINTER; + + if (aResult) *aResult = nullptr; + + nsresult rv; + + // Check to see if somebody has already turned it into a container; if so + // don't try to do it again. + bool isContainer; + rv = IsContainer(aDataSource, aResource, &isContainer); + if (NS_FAILED(rv)) return rv; + + if (!isContainer) + { + rv = aDataSource->Assert(aResource, kRDF_instanceOf, aType, true); + if (NS_FAILED(rv)) return rv; + + rv = aDataSource->Assert(aResource, kRDF_nextVal, kOne, true); + if (NS_FAILED(rv)) return rv; + } + + if (aResult) { + rv = NS_NewRDFContainer(aResult); + if (NS_FAILED(rv)) return rv; + + rv = (*aResult)->Init(aDataSource, aResource); + if (NS_FAILED(rv)) return rv; + } + + return NS_OK; +} + +bool +RDFContainerUtilsImpl::IsA(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType) +{ + if (!aDataSource || !aResource || !aType) { + NS_WARNING("Unexpected null argument"); + return false; + } + + nsresult rv; + + bool result; + rv = aDataSource->HasAssertion(aResource, kRDF_instanceOf, aType, true, &result); + if (NS_FAILED(rv)) + return false; + + return result; +} + +NS_IMETHODIMP +RDFContainerUtilsImpl::IndexOf(nsIRDFDataSource* aDataSource, nsIRDFResource* aContainer, nsIRDFNode* aElement, int32_t* aIndex) +{ + if (!aDataSource || !aContainer) + return NS_ERROR_NULL_POINTER; + + // Assume we can't find it. + *aIndex = -1; + + // If the resource is null, bail quietly + if (! aElement) + return NS_OK; + + // We'll assume that fan-out is much higher than fan-in, so grovel + // through the inbound arcs, look for an ordinal resource, and + // decode it. + nsCOMPtr<nsISimpleEnumerator> arcsIn; + aDataSource->ArcLabelsIn(aElement, getter_AddRefs(arcsIn)); + if (! arcsIn) + return NS_OK; + + while (1) { + bool hasMoreArcs = false; + arcsIn->HasMoreElements(&hasMoreArcs); + if (! hasMoreArcs) + break; + + nsCOMPtr<nsISupports> isupports; + arcsIn->GetNext(getter_AddRefs(isupports)); + if (! isupports) + break; + + nsCOMPtr<nsIRDFResource> property = + do_QueryInterface(isupports); + + if (! property) + continue; + + bool isOrdinal; + IsOrdinalProperty(property, &isOrdinal); + if (! isOrdinal) + continue; + + nsCOMPtr<nsISimpleEnumerator> sources; + aDataSource->GetSources(property, aElement, true, getter_AddRefs(sources)); + if (! sources) + continue; + + while (1) { + bool hasMoreSources = false; + sources->HasMoreElements(&hasMoreSources); + if (! hasMoreSources) + break; + + nsCOMPtr<nsISupports> isupports2; + sources->GetNext(getter_AddRefs(isupports2)); + if (! isupports2) + break; + + nsCOMPtr<nsIRDFResource> source = + do_QueryInterface(isupports2); + + if (source == aContainer) + // Found it. + return OrdinalResourceToIndex(property, aIndex); + } + } + + return NS_OK; +} |