The Tor Browser: rdf/base/src/nsRDFService.cpp@b8a032363ba2 (annotated)

rdf/base/src/nsRDFService.cpp@b8a032363ba2 (annotated)

rdf/base/src/nsRDFService.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

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

 /* -*- 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/.
  *
  *
  * This Original Code has been modified by IBM Corporation.
  * Modifications made by IBM described herein are
  * Copyright (c) International Business Machines
  * Corporation, 2000
  *
  * Modifications to Mozilla code or documentation
  * identified per MPL Section 3.3
  *
  * Date         Modified by     Description of modification
  * 03/27/2000   IBM Corp.       Added PR_CALLBACK for Optlink
  *                               use in OS2
  */
 /*
   This file provides the implementation for the RDF service manager.
   TO DO
   -----
 ) Implement the CreateDataBase() methods.
 ) Cache date and int literals.
  */
 #include "nsRDFService.h"
 #include "nsCOMPtr.h"
 #include "nsAutoPtr.h"
 #include "nsMemory.h"
 #include "nsIAtom.h"
 #include "nsIComponentManager.h"
 #include "nsIRDFDataSource.h"
 #include "nsIRDFNode.h"
 #include "nsIRDFRemoteDataSource.h"
 #include "nsIServiceManager.h"
 #include "nsIFactory.h"
 #include "nsRDFCID.h"
 #include "nsString.h"
 #include "nsXPIDLString.h"
 #include "nsNetUtil.h"
 #include "pldhash.h"
 #include "plhash.h"
 #include "plstr.h"
 #include "prlog.h"
 #include "prprf.h"
 #include "prmem.h"
 #include "rdf.h"
 #include "nsCRT.h"
 #include "nsCRTGlue.h"
 #include "mozilla/HashFunctions.h"
 using namespace mozilla;
 ////////////////////////////////////////////////////////////////////////
 static NS_DEFINE_CID(kRDFXMLDataSourceCID,    NS_RDFXMLDATASOURCE_CID);
 static NS_DEFINE_CID(kRDFDefaultResourceCID,  NS_RDFDEFAULTRESOURCE_CID);
 static NS_DEFINE_IID(kIRDFLiteralIID,         NS_IRDFLITERAL_IID);
 static NS_DEFINE_IID(kIRDFDateIID,         NS_IRDFDATE_IID);
 static NS_DEFINE_IID(kIRDFIntIID,         NS_IRDFINT_IID);
 static NS_DEFINE_IID(kIRDFNodeIID,            NS_IRDFNODE_IID);
 static NS_DEFINE_IID(kISupportsIID,           NS_ISUPPORTS_IID);
 #ifdef PR_LOGGING
 static PRLogModuleInfo* gLog = nullptr;
 #endif
 class BlobImpl;
 // These functions are copied from nsprpub/lib/ds/plhash.c, with one
 // change to free the key in DataSourceFreeEntry.
 // XXX sigh, why were DefaultAllocTable et. al. declared static, anyway?
 static void *
 DataSourceAllocTable(void *pool, size_t size)
 {
     return PR_MALLOC(size);
 }
 static void
 DataSourceFreeTable(void *pool, void *item)
 {
     PR_Free(item);
 }
 static PLHashEntry *
 DataSourceAllocEntry(void *pool, const void *key)
 {
     return PR_NEW(PLHashEntry);
 }
 static void
 DataSourceFreeEntry(void *pool, PLHashEntry *he, unsigned flag)
 {
     if (flag == HT_FREE_ENTRY) {
         PL_strfree((char*) he->key);
         PR_Free(he);
     }
 }
 static PLHashAllocOps dataSourceHashAllocOps = {
     DataSourceAllocTable, DataSourceFreeTable,
     DataSourceAllocEntry, DataSourceFreeEntry
 };
 //----------------------------------------------------------------------
 //
 // For the mResources hashtable.
 //
 struct ResourceHashEntry : public PLDHashEntryHdr {
     const char *mKey;
     nsIRDFResource *mResource;
     static PLDHashNumber
     HashKey(PLDHashTable *table, const void *key)
     {
         return HashString(static_cast<const char *>(key));
     }
     static bool
     MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                const void *key)
     {
         const ResourceHashEntry *entry =
             static_cast<const ResourceHashEntry *>(hdr);
         return 0 == nsCRT::strcmp(static_cast<const char *>(key),
                                   entry->mKey);
     }
 };
 static const PLDHashTableOps gResourceTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
     ResourceHashEntry::HashKey,
     ResourceHashEntry::MatchEntry,
     PL_DHashMoveEntryStub,
     PL_DHashClearEntryStub,
     PL_DHashFinalizeStub,
     nullptr
 };
 // ----------------------------------------------------------------------
 //
 // For the mLiterals hashtable.
 //
 struct LiteralHashEntry : public PLDHashEntryHdr {
     nsIRDFLiteral *mLiteral;
     const char16_t *mKey;
     static PLDHashNumber
     HashKey(PLDHashTable *table, const void *key)
     {
         return HashString(static_cast<const char16_t *>(key));
     }
     static bool
     MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                const void *key)
     {
         const LiteralHashEntry *entry =
             static_cast<const LiteralHashEntry *>(hdr);
         return 0 == nsCRT::strcmp(static_cast<const char16_t *>(key),
                                   entry->mKey);
     }
 };
 static const PLDHashTableOps gLiteralTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
     LiteralHashEntry::HashKey,
     LiteralHashEntry::MatchEntry,
     PL_DHashMoveEntryStub,
     PL_DHashClearEntryStub,
     PL_DHashFinalizeStub,
     nullptr
 };
 // ----------------------------------------------------------------------
 //
 // For the mInts hashtable.
 //
 struct IntHashEntry : public PLDHashEntryHdr {
     nsIRDFInt *mInt;
     int32_t    mKey;
     static PLDHashNumber
     HashKey(PLDHashTable *table, const void *key)
     {
         return PLDHashNumber(*static_cast<const int32_t *>(key));
     }
     static bool
     MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                const void *key)
     {
         const IntHashEntry *entry =
             static_cast<const IntHashEntry *>(hdr);
         return *static_cast<const int32_t *>(key) == entry->mKey;
     }
 };
 static const PLDHashTableOps gIntTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
     IntHashEntry::HashKey,
     IntHashEntry::MatchEntry,
     PL_DHashMoveEntryStub,
     PL_DHashClearEntryStub,
     PL_DHashFinalizeStub,
     nullptr
 };
 // ----------------------------------------------------------------------
 //
 // For the mDates hashtable.
 //
 struct DateHashEntry : public PLDHashEntryHdr {
     nsIRDFDate *mDate;
     PRTime      mKey;
     static PLDHashNumber
     HashKey(PLDHashTable *table, const void *key)
     {
         // xor the low 32 bits with the high 32 bits.
         PRTime t = *static_cast<const PRTime *>(key);
         int32_t h32 = int32_t(t >> 32);
         int32_t l32 = int32_t(0xffffffff & t);
         return PLDHashNumber(l32 ^ h32);
     }
     static bool
     MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                const void *key)
     {
         const DateHashEntry *entry =
             static_cast<const DateHashEntry *>(hdr);
         return *static_cast<const PRTime *>(key) == entry->mKey;
     }
 };
 static const PLDHashTableOps gDateTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
     DateHashEntry::HashKey,
     DateHashEntry::MatchEntry,
     PL_DHashMoveEntryStub,
     PL_DHashClearEntryStub,
     PL_DHashFinalizeStub,
     nullptr
 };
 class BlobImpl : public nsIRDFBlob
 {
 public:
     struct Data {
         int32_t  mLength;
         uint8_t *mBytes;
     };
     BlobImpl(const uint8_t *aBytes, int32_t aLength)
     {
         mData.mLength = aLength;
         mData.mBytes = new uint8_t[aLength];
         memcpy(mData.mBytes, aBytes, aLength);
         NS_ADDREF(RDFServiceImpl::gRDFService);
         RDFServiceImpl::gRDFService->RegisterBlob(this);
     }
     virtual ~BlobImpl()
     {
         RDFServiceImpl::gRDFService->UnregisterBlob(this);
         // Use NS_RELEASE2() here, because we want to decrease the
         // refcount, but not null out the gRDFService pointer (which is
         // what a vanilla NS_RELEASE() would do).
         nsrefcnt refcnt;
         NS_RELEASE2(RDFServiceImpl::gRDFService, refcnt);
         delete[] mData.mBytes;
     }
     NS_DECL_ISUPPORTS
     NS_DECL_NSIRDFNODE
     NS_DECL_NSIRDFBLOB
     Data mData;
 };
 NS_IMPL_ISUPPORTS(BlobImpl, nsIRDFNode, nsIRDFBlob)
 NS_IMETHODIMP
 BlobImpl::EqualsNode(nsIRDFNode *aNode, bool *aEquals)
 {
     nsCOMPtr<nsIRDFBlob> blob = do_QueryInterface(aNode);
     if (blob) {
         int32_t length;
         blob->GetLength(&length);
         if (length == mData.mLength) {
             const uint8_t *bytes;
             blob->GetValue(&bytes);
             if (0 == memcmp(bytes, mData.mBytes, length)) {
                 *aEquals = true;
                 return NS_OK;
             }
         }
     }
     *aEquals = false;
     return NS_OK;
 }
 NS_IMETHODIMP
 BlobImpl::GetValue(const uint8_t **aResult)
 {
     *aResult = mData.mBytes;
     return NS_OK;
 }
 NS_IMETHODIMP
 BlobImpl::GetLength(int32_t *aResult)
 {
     *aResult = mData.mLength;
     return NS_OK;
 }
 // ----------------------------------------------------------------------
 //
 // For the mBlobs hashtable.
 //
 struct BlobHashEntry : public PLDHashEntryHdr {
     BlobImpl *mBlob;
     static PLDHashNumber
     HashKey(PLDHashTable *table, const void *key)
     {
         const BlobImpl::Data *data =
             static_cast<const BlobImpl::Data *>(key);
         return HashBytes(data->mBytes, data->mLength);
     }
     static bool
     MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                const void *key)
     {
         const BlobHashEntry *entry =
             static_cast<const BlobHashEntry *>(hdr);
         const BlobImpl::Data *left = &entry->mBlob->mData;
         const BlobImpl::Data *right =
             static_cast<const BlobImpl::Data *>(key);
         return (left->mLength == right->mLength)
             && 0 == memcmp(left->mBytes, right->mBytes, right->mLength);
     }
 };
 static const PLDHashTableOps gBlobTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
     BlobHashEntry::HashKey,
     BlobHashEntry::MatchEntry,
     PL_DHashMoveEntryStub,
     PL_DHashClearEntryStub,
     PL_DHashFinalizeStub,
     nullptr
 };
 ////////////////////////////////////////////////////////////////////////
 // LiteralImpl
 //
 //   Currently, all literals are implemented exactly the same way;
 //   i.e., there is are no resource factories to allow you to generate
 //   customer resources. I doubt that makes sense, anyway.
 //
 class LiteralImpl : public nsIRDFLiteral {
 public:
     static nsresult
     Create(const char16_t* aValue, nsIRDFLiteral** aResult);
     // nsISupports
     NS_DECL_THREADSAFE_ISUPPORTS
     // nsIRDFNode
     NS_DECL_NSIRDFNODE
     // nsIRDFLiteral
     NS_DECL_NSIRDFLITERAL
 protected:
     LiteralImpl(const char16_t* s);
     virtual ~LiteralImpl();
     const char16_t* GetValue() const {
         size_t objectSize = ((sizeof(LiteralImpl) + sizeof(char16_t) - 1) / sizeof(char16_t)) * sizeof(char16_t);
         return reinterpret_cast<const char16_t*>(reinterpret_cast<const unsigned char*>(this) + objectSize);
     }
 };
 nsresult
 LiteralImpl::Create(const char16_t* aValue, nsIRDFLiteral** aResult)
 {
     // Goofy math to get alignment right. Copied from nsSharedString.h.
     size_t objectSize = ((sizeof(LiteralImpl) + sizeof(char16_t) - 1) / sizeof(char16_t)) * sizeof(char16_t);
     size_t stringLen = nsCharTraits<char16_t>::length(aValue);
     size_t stringSize = (stringLen + 1) * sizeof(char16_t);
     void* objectPtr = operator new(objectSize + stringSize);
     if (! objectPtr)
         return NS_ERROR_NULL_POINTER;
     char16_t* buf = reinterpret_cast<char16_t*>(static_cast<unsigned char*>(objectPtr) + objectSize);
     nsCharTraits<char16_t>::copy(buf, aValue, stringLen + 1);
     NS_ADDREF(*aResult = new (objectPtr) LiteralImpl(buf));
     return NS_OK;
 }
 LiteralImpl::LiteralImpl(const char16_t* s)
 {
     RDFServiceImpl::gRDFService->RegisterLiteral(this);
     NS_ADDREF(RDFServiceImpl::gRDFService);
 }
 LiteralImpl::~LiteralImpl()
 {
     RDFServiceImpl::gRDFService->UnregisterLiteral(this);
     // Use NS_RELEASE2() here, because we want to decrease the
     // refcount, but not null out the gRDFService pointer (which is
     // what a vanilla NS_RELEASE() would do).
     nsrefcnt refcnt;
     NS_RELEASE2(RDFServiceImpl::gRDFService, refcnt);
 }
 NS_IMPL_ADDREF(LiteralImpl)
 NS_IMPL_RELEASE(LiteralImpl)
 nsresult
 LiteralImpl::QueryInterface(REFNSIID iid, void** result)
 {
     if (! result)
         return NS_ERROR_NULL_POINTER;
     *result = nullptr;
     if (iid.Equals(kIRDFLiteralIID) ||
         iid.Equals(kIRDFNodeIID) ||
         iid.Equals(kISupportsIID)) {
         *result = static_cast<nsIRDFLiteral*>(this);
         AddRef();
         return NS_OK;
     }
     return NS_NOINTERFACE;
 }
 NS_IMETHODIMP
 LiteralImpl::EqualsNode(nsIRDFNode* aNode, bool* aResult)
 {
     nsresult rv;
     nsIRDFLiteral* literal;
     rv = aNode->QueryInterface(kIRDFLiteralIID, (void**) &literal);
     if (NS_SUCCEEDED(rv)) {
         *aResult = (static_cast<nsIRDFLiteral*>(this) == literal);
         NS_RELEASE(literal);
         return NS_OK;
     }
     else if (rv == NS_NOINTERFACE) {
         *aResult = false;
         return NS_OK;
     }
     else {
         return rv;
     }
 }
 NS_IMETHODIMP
 LiteralImpl::GetValue(char16_t* *value)
 {
     NS_ASSERTION(value, "null ptr");
     if (! value)
         return NS_ERROR_NULL_POINTER;
     const char16_t *temp = GetValue();
     *value = temp? NS_strdup(temp) : 0;
     return NS_OK;
 }
 NS_IMETHODIMP
 LiteralImpl::GetValueConst(const char16_t** aValue)
 {
     *aValue = GetValue();
     return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////
 // DateImpl
 //
 class DateImpl : public nsIRDFDate {
 public:
     DateImpl(const PRTime s);
     virtual ~DateImpl();
     // nsISupports
     NS_DECL_ISUPPORTS
     // nsIRDFNode
     NS_DECL_NSIRDFNODE
     // nsIRDFDate
     NS_IMETHOD GetValue(PRTime *value);
 private:
     nsresult EqualsDate(nsIRDFDate* date, bool* result);
     PRTime mValue;
 };
 DateImpl::DateImpl(const PRTime s)
     : mValue(s)
 {
     RDFServiceImpl::gRDFService->RegisterDate(this);
     NS_ADDREF(RDFServiceImpl::gRDFService);
 }
 DateImpl::~DateImpl()
 {
     RDFServiceImpl::gRDFService->UnregisterDate(this);
     // Use NS_RELEASE2() here, because we want to decrease the
     // refcount, but not null out the gRDFService pointer (which is
     // what a vanilla NS_RELEASE() would do).
     nsrefcnt refcnt;
     NS_RELEASE2(RDFServiceImpl::gRDFService, refcnt);
 }
 NS_IMPL_ADDREF(DateImpl)
 NS_IMPL_RELEASE(DateImpl)
 nsresult
 DateImpl::QueryInterface(REFNSIID iid, void** result)
 {
     if (! result)
         return NS_ERROR_NULL_POINTER;
     *result = nullptr;
     if (iid.Equals(kIRDFDateIID) ||
         iid.Equals(kIRDFNodeIID) ||
         iid.Equals(kISupportsIID)) {
         *result = static_cast<nsIRDFDate*>(this);
         AddRef();
         return NS_OK;
     }
     return NS_NOINTERFACE;
 }
 NS_IMETHODIMP
 DateImpl::EqualsNode(nsIRDFNode* node, bool* result)
 {
     nsresult rv;
     nsIRDFDate* date;
     if (NS_SUCCEEDED(node->QueryInterface(kIRDFDateIID, (void**) &date))) {
         rv = EqualsDate(date, result);
         NS_RELEASE(date);
     }
     else {
         *result = false;
         rv = NS_OK;
     }
     return rv;
 }
 NS_IMETHODIMP
 DateImpl::GetValue(PRTime *value)
 {
     NS_ASSERTION(value, "null ptr");
     if (! value)
         return NS_ERROR_NULL_POINTER;
     *value = mValue;
     return NS_OK;
 }
 nsresult
 DateImpl::EqualsDate(nsIRDFDate* date, bool* result)
 {
     NS_ASSERTION(date && result, "null ptr");
     if (!date || !result)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     PRTime p;
     if (NS_FAILED(rv = date->GetValue(&p)))
         return rv;
     *result = p == mValue;
     return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////
 // IntImpl
 //
 class IntImpl : public nsIRDFInt {
 public:
     IntImpl(int32_t s);
     virtual ~IntImpl();
     // nsISupports
     NS_DECL_ISUPPORTS
     // nsIRDFNode
     NS_DECL_NSIRDFNODE
     // nsIRDFInt
     NS_IMETHOD GetValue(int32_t *value);
 private:
     nsresult EqualsInt(nsIRDFInt* value, bool* result);
     int32_t mValue;
 };
 IntImpl::IntImpl(int32_t s)
     : mValue(s)
 {
     RDFServiceImpl::gRDFService->RegisterInt(this);
     NS_ADDREF(RDFServiceImpl::gRDFService);
 }
 IntImpl::~IntImpl()
 {
     RDFServiceImpl::gRDFService->UnregisterInt(this);
     // Use NS_RELEASE2() here, because we want to decrease the
     // refcount, but not null out the gRDFService pointer (which is
     // what a vanilla NS_RELEASE() would do).
     nsrefcnt refcnt;
     NS_RELEASE2(RDFServiceImpl::gRDFService, refcnt);
 }
 NS_IMPL_ADDREF(IntImpl)
 NS_IMPL_RELEASE(IntImpl)
 nsresult
 IntImpl::QueryInterface(REFNSIID iid, void** result)
 {
     if (! result)
         return NS_ERROR_NULL_POINTER;
     *result = nullptr;
     if (iid.Equals(kIRDFIntIID) ||
         iid.Equals(kIRDFNodeIID) ||
         iid.Equals(kISupportsIID)) {
         *result = static_cast<nsIRDFInt*>(this);
         AddRef();
         return NS_OK;
     }
     return NS_NOINTERFACE;
 }
 NS_IMETHODIMP
 IntImpl::EqualsNode(nsIRDFNode* node, bool* result)
 {
     nsresult rv;
     nsIRDFInt* intValue;
     if (NS_SUCCEEDED(node->QueryInterface(kIRDFIntIID, (void**) &intValue))) {
         rv = EqualsInt(intValue, result);
         NS_RELEASE(intValue);
     }
     else {
         *result = false;
         rv = NS_OK;
     }
     return rv;
 }
 NS_IMETHODIMP
 IntImpl::GetValue(int32_t *value)
 {
     NS_ASSERTION(value, "null ptr");
     if (! value)
         return NS_ERROR_NULL_POINTER;
     *value = mValue;
     return NS_OK;
 }
 nsresult
 IntImpl::EqualsInt(nsIRDFInt* intValue, bool* result)
 {
     NS_ASSERTION(intValue && result, "null ptr");
     if (!intValue || !result)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     int32_t p;
     if (NS_FAILED(rv = intValue->GetValue(&p)))
         return rv;
     *result = (p == mValue);
     return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////
 // RDFServiceImpl
 RDFServiceImpl*
 RDFServiceImpl::gRDFService;
 RDFServiceImpl::RDFServiceImpl()
     :  mNamedDataSources(nullptr)
 {
     mResources.ops = nullptr;
     mLiterals.ops = nullptr;
     mInts.ops = nullptr;
     mDates.ops = nullptr;
     mBlobs.ops = nullptr;
     gRDFService = this;
 }
 nsresult
 RDFServiceImpl::Init()
 {
     nsresult rv;
     mNamedDataSources = PL_NewHashTable(23,
                                         PL_HashString,
                                         PL_CompareStrings,
                                         PL_CompareValues,
                                         &dataSourceHashAllocOps, nullptr);
     if (! mNamedDataSources)
         return NS_ERROR_OUT_OF_MEMORY;
     PL_DHashTableInit(&mResources, &gResourceTableOps, nullptr,
                       sizeof(ResourceHashEntry), PL_DHASH_MIN_SIZE);
     PL_DHashTableInit(&mLiterals, &gLiteralTableOps, nullptr,
                       sizeof(LiteralHashEntry), PL_DHASH_MIN_SIZE);
     PL_DHashTableInit(&mInts, &gIntTableOps, nullptr,
                       sizeof(IntHashEntry), PL_DHASH_MIN_SIZE);
     PL_DHashTableInit(&mDates, &gDateTableOps, nullptr,
                       sizeof(DateHashEntry), PL_DHASH_MIN_SIZE);
     PL_DHashTableInit(&mBlobs, &gBlobTableOps, nullptr,
                       sizeof(BlobHashEntry), PL_DHASH_MIN_SIZE);
     mDefaultResourceFactory = do_GetClassObject(kRDFDefaultResourceCID, &rv);
     NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get default resource factory");
     if (NS_FAILED(rv)) return rv;
 #ifdef PR_LOGGING
     if (! gLog)
         gLog = PR_NewLogModule("nsRDFService");
 #endif
     return NS_OK;
 }
 RDFServiceImpl::~RDFServiceImpl()
 {
     if (mNamedDataSources) {
         PL_HashTableDestroy(mNamedDataSources);
         mNamedDataSources = nullptr;
     }
     if (mResources.ops)
         PL_DHashTableFinish(&mResources);
     if (mLiterals.ops)
         PL_DHashTableFinish(&mLiterals);
     if (mInts.ops)
         PL_DHashTableFinish(&mInts);
     if (mDates.ops)
         PL_DHashTableFinish(&mDates);
     if (mBlobs.ops)
         PL_DHashTableFinish(&mBlobs);
     gRDFService = nullptr;
 }
 // static
 nsresult
 RDFServiceImpl::CreateSingleton(nsISupports* aOuter,
                                 const nsIID& aIID, void **aResult)
 {
     NS_ENSURE_NO_AGGREGATION(aOuter);
     if (gRDFService) {
         NS_ERROR("Trying to create RDF serviec twice.");
         return gRDFService->QueryInterface(aIID, aResult);
     }
     nsRefPtr<RDFServiceImpl> serv = new RDFServiceImpl();
     if (!serv)
         return NS_ERROR_OUT_OF_MEMORY;
     nsresult rv = serv->Init();
     if (NS_FAILED(rv))
         return rv;
     return serv->QueryInterface(aIID, aResult);
 }
 NS_IMPL_ISUPPORTS(RDFServiceImpl, nsIRDFService, nsISupportsWeakReference)
 // Per RFC2396.
 static const uint8_t
 kLegalSchemeChars[] = {
           //        ASCII    Bits     Ordered  Hex
           //                 01234567 76543210
 x00, // 00-07
 x00, // 08-0F
 x00, // 10-17
 x00, // 18-1F
 x00, // 20-27   !"#$%&' 00000000 00000000
 x28, // 28-2F  ()*+,-./ 00010100 00101000 0x28
 xff, // 30-37  01234567 11111111 11111111 0xFF
 x03, // 38-3F  89:;<=>? 11000000 00000011 0x03
 xfe, // 40-47  @ABCDEFG 01111111 11111110 0xFE
 xff, // 48-4F  HIJKLMNO 11111111 11111111 0xFF
 xff, // 50-57  PQRSTUVW 11111111 11111111 0xFF
 x87, // 58-5F  XYZ[\]^_ 11100001 10000111 0x87
 xfe, // 60-67  `abcdefg 01111111 11111110 0xFE
 xff, // 68-6F  hijklmno 11111111 11111111 0xFF
 xff, // 70-77  pqrstuvw 11111111 11111111 0xFF
 x07, // 78-7F  xyz{|}~  11100000 00000111 0x07
 x00, 0x00, 0x00, 0x00, // >= 80
 x00, 0x00, 0x00, 0x00,
 x00, 0x00, 0x00, 0x00,
 x00, 0x00, 0x00, 0x00
 };
 static inline bool
 IsLegalSchemeCharacter(const char aChar)
 {
     uint8_t mask = kLegalSchemeChars[aChar >> 3];
     uint8_t bit = 1u << (aChar & 0x7);
     return bool((mask & bit) != 0);
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetResource(const nsACString& aURI, nsIRDFResource** aResource)
 {
     // Sanity checks
     NS_PRECONDITION(aResource != nullptr, "null ptr");
     NS_PRECONDITION(!aURI.IsEmpty(), "URI is empty");
     if (! aResource)
         return NS_ERROR_NULL_POINTER;
     if (aURI.IsEmpty())
         return NS_ERROR_INVALID_ARG;
     const nsAFlatCString& flatURI = PromiseFlatCString(aURI);
     PR_LOG(gLog, PR_LOG_DEBUG, ("rdfserv get-resource %s", flatURI.get()));
     // First, check the cache to see if we've already created and
     // registered this thing.
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mResources, flatURI.get(), PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         ResourceHashEntry *entry = static_cast<ResourceHashEntry *>(hdr);
         NS_ADDREF(*aResource = entry->mResource);
         return NS_OK;
     }
     // Nope. So go to the repository to create it.
     // Compute the scheme of the URI. Scan forward until we either:
     //
     // 1. Reach the end of the string
     // 2. Encounter a non-alpha character
     // 3. Encouter a colon.
     //
     // If we encounter a colon _before_ encountering a non-alpha
     // character, then assume it's the scheme.
     //
     // XXX Although it's really not correct, we'll allow underscore
     // characters ('_'), too.
     nsACString::const_iterator p, end;
     aURI.BeginReading(p);
     aURI.EndReading(end);
     while (p != end && IsLegalSchemeCharacter(*p))
         ++p;
     nsresult rv;
     nsCOMPtr<nsIFactory> factory;
     nsACString::const_iterator begin;
     aURI.BeginReading(begin);
     if (*p == ':') {
         // There _was_ a scheme. First see if it's the same scheme
         // that we just tried to use...
         if (mLastFactory && mLastURIPrefix.Equals(Substring(begin, p)))
             factory = mLastFactory;
         else {
             // Try to find a factory using the component manager.
             nsACString::const_iterator begin;
             aURI.BeginReading(begin);
             nsAutoCString contractID;
             contractID = NS_LITERAL_CSTRING(NS_RDF_RESOURCE_FACTORY_CONTRACTID_PREFIX) +
                          Substring(begin, p);
             factory = do_GetClassObject(contractID.get());
             if (factory) {
                 // Store the factory in our one-element cache.
                 if (p != begin) {
                     mLastFactory = factory;
                     mLastURIPrefix = Substring(begin, p);
                 }
             }
         }
     }
     if (! factory) {
         // fall through to using the "default" resource factory if either:
         //
         // 1. The URI didn't have a scheme, or
         // 2. There was no resource factory registered for the scheme.
         factory = mDefaultResourceFactory;
         // Store the factory in our one-element cache.
         if (p != begin) {
             mLastFactory = factory;
             mLastURIPrefix = Substring(begin, p);
         }
     }
     nsIRDFResource *result;
     rv = factory->CreateInstance(nullptr, NS_GET_IID(nsIRDFResource), (void**) &result);
     if (NS_FAILED(rv)) return rv;
     // Now initialize it with its URI. At this point, the resource
     // implementation should register itself with the RDF service.
     rv = result->Init(flatURI.get());
     if (NS_FAILED(rv)) {
         NS_ERROR("unable to initialize resource");
         NS_RELEASE(result);
         return rv;
     }
     *aResource = result; // already refcounted from repository
     return rv;
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetUnicodeResource(const nsAString& aURI, nsIRDFResource** aResource)
 {
     return GetResource(NS_ConvertUTF16toUTF8(aURI), aResource);
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetAnonymousResource(nsIRDFResource** aResult)
 {
 static uint32_t gCounter = 0;
 static char gChars[] = "0123456789abcdef"
                        "ghijklmnopqrstuv"
                        "wxyzABCDEFGHIJKL"
                        "MNOPQRSTUVWXYZ.+";
 static int32_t kMask  = 0x003f;
 static int32_t kShift = 6;
     if (! gCounter) {
         // Start it at a semi-unique value, just to minimize the
         // chance that we get into a situation where
         //
         // 1. An anonymous resource gets serialized out in a graph
         // 2. Reboot
         // 3. The same anonymous resource gets requested, and refers
         //    to something completely different.
         // 4. The serialization is read back in.
         gCounter = uint32_t(PR_Now());
     }
     nsresult rv;
     nsAutoCString s;
     do {
         // Ugh, this is a really sloppy way to do this; I copied the
         // implementation from the days when it lived outside the RDF
         // service. Now that it's a member we can be more cleverer.
         s.Truncate();
         s.Append("rdf:#$");
         uint32_t id = ++gCounter;
         while (id) {
             char ch = gChars[(id & kMask)];
             s.Append(ch);
             id >>= kShift;
         }
         nsIRDFResource* resource;
         rv = GetResource(s, &resource);
         if (NS_FAILED(rv)) return rv;
         // XXX an ugly but effective way to make sure that this
         // resource is really unique in the world.
         resource->AddRef();
         nsrefcnt refcnt = resource->Release();
         if (refcnt == 1) {
             *aResult = resource;
             break;
         }
         NS_RELEASE(resource);
     } while (1);
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetLiteral(const char16_t* aValue, nsIRDFLiteral** aLiteral)
 {
     NS_PRECONDITION(aValue != nullptr, "null ptr");
     if (! aValue)
         return NS_ERROR_NULL_POINTER;
     NS_PRECONDITION(aLiteral != nullptr, "null ptr");
     if (! aLiteral)
         return NS_ERROR_NULL_POINTER;
     // See if we have one already cached
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mLiterals, aValue, PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         LiteralHashEntry *entry = static_cast<LiteralHashEntry *>(hdr);
         NS_ADDREF(*aLiteral = entry->mLiteral);
         return NS_OK;
     }
     // Nope. Create a new one
     return LiteralImpl::Create(aValue, aLiteral);
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetDateLiteral(PRTime aTime, nsIRDFDate** aResult)
 {
     // See if we have one already cached
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mDates, &aTime, PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         DateHashEntry *entry = static_cast<DateHashEntry *>(hdr);
         NS_ADDREF(*aResult = entry->mDate);
         return NS_OK;
     }
     DateImpl* result = new DateImpl(aTime);
     if (! result)
         return NS_ERROR_OUT_OF_MEMORY;
     NS_ADDREF(*aResult = result);
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetIntLiteral(int32_t aInt, nsIRDFInt** aResult)
 {
     // See if we have one already cached
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mInts, &aInt, PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         IntHashEntry *entry = static_cast<IntHashEntry *>(hdr);
         NS_ADDREF(*aResult = entry->mInt);
         return NS_OK;
     }
     IntImpl* result = new IntImpl(aInt);
     if (! result)
         return NS_ERROR_OUT_OF_MEMORY;
     NS_ADDREF(*aResult = result);
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetBlobLiteral(const uint8_t *aBytes, int32_t aLength,
                                nsIRDFBlob **aResult)
 {
     BlobImpl::Data key = { aLength, const_cast<uint8_t *>(aBytes) };
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mBlobs, &key, PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         BlobHashEntry *entry = static_cast<BlobHashEntry *>(hdr);
         NS_ADDREF(*aResult = entry->mBlob);
         return NS_OK;
     }
     BlobImpl *result = new BlobImpl(aBytes, aLength);
     if (! result)
         return NS_ERROR_OUT_OF_MEMORY;
     NS_ADDREF(*aResult = result);
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::IsAnonymousResource(nsIRDFResource* aResource, bool* _result)
 {
     NS_PRECONDITION(aResource != nullptr, "null ptr");
     if (! aResource)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     const char* uri;
     rv = aResource->GetValueConst(&uri);
     if (NS_FAILED(rv)) return rv;
     if ((uri[0] == 'r') &&
         (uri[1] == 'd') &&
         (uri[2] == 'f') &&
         (uri[3] == ':') &&
         (uri[4] == '#') &&
         (uri[5] == '$')) {
         *_result = true;
     }
     else {
         *_result = false;
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::RegisterResource(nsIRDFResource* aResource, bool aReplace)
 {
     NS_PRECONDITION(aResource != nullptr, "null ptr");
     if (! aResource)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     const char* uri;
     rv = aResource->GetValueConst(&uri);
     NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get URI from resource");
     if (NS_FAILED(rv)) return rv;
     NS_ASSERTION(uri != nullptr, "resource has no URI");
     if (! uri)
         return NS_ERROR_NULL_POINTER;
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mResources, uri, PL_DHASH_LOOKUP);
     if (PL_DHASH_ENTRY_IS_BUSY(hdr)) {
         if (!aReplace) {
             NS_WARNING("resource already registered, and replace not specified");
             return NS_ERROR_FAILURE;    // already registered
         }
         // N.B., we do _not_ release the original resource because we
         // only ever held a weak reference to it. We simply replace
         // it.
         PR_LOG(gLog, PR_LOG_DEBUG,
                ("rdfserv   replace-resource [%p] <-- [%p] %s",
                 static_cast<ResourceHashEntry *>(hdr)->mResource,
                 aResource, (const char*) uri));
     }
     else {
         hdr = PL_DHashTableOperate(&mResources, uri, PL_DHASH_ADD);
         if (! hdr)
             return NS_ERROR_OUT_OF_MEMORY;
         PR_LOG(gLog, PR_LOG_DEBUG,
                ("rdfserv   register-resource [%p] %s",
                 aResource, (const char*) uri));
     }
     // N.B., we only hold a weak reference to the resource: that way,
     // the resource can be destroyed when the last refcount goes
     // away. The single addref that the CreateResource() call made
     // will be owned by the callee.
     ResourceHashEntry *entry = static_cast<ResourceHashEntry *>(hdr);
     entry->mResource = aResource;
     entry->mKey = uri;
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::UnregisterResource(nsIRDFResource* aResource)
 {
     NS_PRECONDITION(aResource != nullptr, "null ptr");
     if (! aResource)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     const char* uri;
     rv = aResource->GetValueConst(&uri);
     if (NS_FAILED(rv)) return rv;
     NS_ASSERTION(uri != nullptr, "resource has no URI");
     if (! uri)
         return NS_ERROR_UNEXPECTED;
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv unregister-resource [%p] %s",
             aResource, (const char*) uri));
 #ifdef DEBUG
     if (PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mResources, uri, PL_DHASH_LOOKUP)))
         NS_WARNING("resource was never registered");
 #endif
     PL_DHashTableOperate(&mResources, uri, PL_DHASH_REMOVE);
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::RegisterDataSource(nsIRDFDataSource* aDataSource, bool aReplace)
 {
     NS_PRECONDITION(aDataSource != nullptr, "null ptr");
     if (! aDataSource)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     nsXPIDLCString uri;
     rv = aDataSource->GetURI(getter_Copies(uri));
     if (NS_FAILED(rv)) return rv;
     PLHashEntry** hep =
         PL_HashTableRawLookup(mNamedDataSources, (*mNamedDataSources->keyHash)(uri), uri);
     if (*hep) {
         if (! aReplace)
             return NS_ERROR_FAILURE; // already registered
         // N.B., we only hold a weak reference to the datasource, so
         // just replace the old with the new and don't touch any
         // refcounts.
         PR_LOG(gLog, PR_LOG_NOTICE,
                ("rdfserv    replace-datasource [%p] <-- [%p] %s",
                 (*hep)->value, aDataSource, (const char*) uri));
         (*hep)->value = aDataSource;
     }
     else {
         const char* key = PL_strdup(uri);
         if (! key)
             return NS_ERROR_OUT_OF_MEMORY;
         PL_HashTableAdd(mNamedDataSources, key, aDataSource);
         PR_LOG(gLog, PR_LOG_NOTICE,
                ("rdfserv   register-datasource [%p] %s",
                 aDataSource, (const char*) uri));
         // N.B., we only hold a weak reference to the datasource, so don't
         // addref.
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::UnregisterDataSource(nsIRDFDataSource* aDataSource)
 {
     NS_PRECONDITION(aDataSource != nullptr, "null ptr");
     if (! aDataSource)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     nsXPIDLCString uri;
     rv = aDataSource->GetURI(getter_Copies(uri));
     if (NS_FAILED(rv)) return rv;
     //NS_ASSERTION(uri != nullptr, "datasource has no URI");
     if (! uri)
         return NS_ERROR_UNEXPECTED;
     PLHashEntry** hep =
         PL_HashTableRawLookup(mNamedDataSources, (*mNamedDataSources->keyHash)(uri), uri);
     // It may well be that this datasource was never registered. If
     // so, don't unregister it.
     if (! *hep || ((*hep)->value != aDataSource))
         return NS_OK;
     // N.B., we only held a weak reference to the datasource, so we
     // don't release here.
     PL_HashTableRawRemove(mNamedDataSources, hep, *hep);
     PR_LOG(gLog, PR_LOG_NOTICE,
            ("rdfserv unregister-datasource [%p] %s",
             aDataSource, (const char*) uri));
     return NS_OK;
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetDataSource(const char* aURI, nsIRDFDataSource** aDataSource)
 {
     // Use the other GetDataSource and ask for a non-blocking Refresh.
     // If you wanted it loaded synchronously, then you should've tried to do it
     // yourself, or used GetDataSourceBlocking.
     return GetDataSource( aURI, false, aDataSource );
 }
 NS_IMETHODIMP
 RDFServiceImpl::GetDataSourceBlocking(const char* aURI, nsIRDFDataSource** aDataSource)
 {
     // Use GetDataSource and ask for a blocking Refresh.
     return GetDataSource( aURI, true, aDataSource );
 }
 nsresult
 RDFServiceImpl::GetDataSource(const char* aURI, bool aBlock, nsIRDFDataSource** aDataSource)
 {
     NS_PRECONDITION(aURI != nullptr, "null ptr");
     if (! aURI)
         return NS_ERROR_NULL_POINTER;
     nsresult rv;
     // Attempt to canonify the URI before we look for it in the
     // cache. We won't bother doing this on `rdf:' URIs to avoid
     // useless (and expensive) protocol handler lookups.
     nsAutoCString spec(aURI);
     if (!StringBeginsWith(spec, NS_LITERAL_CSTRING("rdf:"))) {
         nsCOMPtr<nsIURI> uri;
         NS_NewURI(getter_AddRefs(uri), spec);
         if (uri)
             uri->GetSpec(spec);
     }
     // First, check the cache to see if we already have this
     // datasource loaded and initialized.
     {
         nsIRDFDataSource* cached =
             static_cast<nsIRDFDataSource*>(PL_HashTableLookup(mNamedDataSources, spec.get()));
         if (cached) {
             NS_ADDREF(cached);
             *aDataSource = cached;
             return NS_OK;
         }
     }
     // Nope. So go to the repository to try to create it.
     nsCOMPtr<nsIRDFDataSource> ds;
     if (StringBeginsWith(spec, NS_LITERAL_CSTRING("rdf:"))) {
         // It's a built-in data source. Convert it to a contract ID.
         nsAutoCString contractID(
                 NS_LITERAL_CSTRING(NS_RDF_DATASOURCE_CONTRACTID_PREFIX) +
                 Substring(spec, 4, spec.Length() - 4));
         // Strip params to get ``base'' contractID for data source.
         int32_t p = contractID.FindChar(char16_t('&'));
         if (p >= 0)
             contractID.Truncate(p);
         ds = do_GetService(contractID.get(), &rv);
         if (NS_FAILED(rv)) return rv;
         nsCOMPtr<nsIRDFRemoteDataSource> remote = do_QueryInterface(ds);
         if (remote) {
             rv = remote->Init(spec.get());
             if (NS_FAILED(rv)) return rv;
         }
     }
     else {
         // Try to load this as an RDF/XML data source
         ds = do_CreateInstance(kRDFXMLDataSourceCID, &rv);
         if (NS_FAILED(rv)) return rv;
         nsCOMPtr<nsIRDFRemoteDataSource> remote(do_QueryInterface(ds));
         NS_ASSERTION(remote, "not a remote RDF/XML data source!");
         if (! remote) return NS_ERROR_UNEXPECTED;
         rv = remote->Init(spec.get());
         if (NS_FAILED(rv)) return rv;
         rv = remote->Refresh(aBlock);
         if (NS_FAILED(rv)) return rv;
     }
     *aDataSource = ds;
     NS_ADDREF(*aDataSource);
     return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////
 nsresult
 RDFServiceImpl::RegisterLiteral(nsIRDFLiteral* aLiteral)
 {
     const char16_t* value;
     aLiteral->GetValueConst(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mLiterals,
                                                              value,
                                                              PL_DHASH_LOOKUP)),
                  "literal already registered");
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mLiterals, value, PL_DHASH_ADD);
     if (! hdr)
         return NS_ERROR_OUT_OF_MEMORY;
     LiteralHashEntry *entry = static_cast<LiteralHashEntry *>(hdr);
     // N.B., we only hold a weak reference to the literal: that
     // way, the literal can be destroyed when the last refcount
     // goes away. The single addref that the CreateLiteral() call
     // made will be owned by the callee.
     entry->mLiteral = aLiteral;
     entry->mKey = value;
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv   register-literal [%p] %s",
             aLiteral, (const char16_t*) value));
     return NS_OK;
 }
 nsresult
 RDFServiceImpl::UnregisterLiteral(nsIRDFLiteral* aLiteral)
 {
     const char16_t* value;
     aLiteral->GetValueConst(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(PL_DHashTableOperate(&mLiterals,
                                                              value,
                                                              PL_DHASH_LOOKUP)),
                  "literal was never registered");
     PL_DHashTableOperate(&mLiterals, value, PL_DHASH_REMOVE);
     // N.B. that we _don't_ release the literal: we only held a weak
     // reference to it in the hashtable.
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv unregister-literal [%p] %s",
             aLiteral, (const char16_t*) value));
     return NS_OK;
 }
 //----------------------------------------------------------------------
 nsresult
 RDFServiceImpl::RegisterInt(nsIRDFInt* aInt)
 {
     int32_t value;
     aInt->GetValue(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mInts,
                                                              &value,
                                                              PL_DHASH_LOOKUP)),
                  "int already registered");
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mInts, &value, PL_DHASH_ADD);
     if (! hdr)
         return NS_ERROR_OUT_OF_MEMORY;
     IntHashEntry *entry = static_cast<IntHashEntry *>(hdr);
     // N.B., we only hold a weak reference to the literal: that
     // way, the literal can be destroyed when the last refcount
     // goes away. The single addref that the CreateInt() call
     // made will be owned by the callee.
     entry->mInt = aInt;
     entry->mKey = value;
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv   register-int [%p] %d",
             aInt, value));
     return NS_OK;
 }
 nsresult
 RDFServiceImpl::UnregisterInt(nsIRDFInt* aInt)
 {
     int32_t value;
     aInt->GetValue(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(PL_DHashTableOperate(&mInts,
                                                              &value,
                                                              PL_DHASH_LOOKUP)),
                  "int was never registered");
     PL_DHashTableOperate(&mInts, &value, PL_DHASH_REMOVE);
     // N.B. that we _don't_ release the literal: we only held a weak
     // reference to it in the hashtable.
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv unregister-int [%p] %d",
             aInt, value));
     return NS_OK;
 }
 //----------------------------------------------------------------------
 nsresult
 RDFServiceImpl::RegisterDate(nsIRDFDate* aDate)
 {
     PRTime value;
     aDate->GetValue(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mDates,
                                                              &value,
                                                              PL_DHASH_LOOKUP)),
                  "date already registered");
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mDates, &value, PL_DHASH_ADD);
     if (! hdr)
         return NS_ERROR_OUT_OF_MEMORY;
     DateHashEntry *entry = static_cast<DateHashEntry *>(hdr);
     // N.B., we only hold a weak reference to the literal: that
     // way, the literal can be destroyed when the last refcount
     // goes away. The single addref that the CreateDate() call
     // made will be owned by the callee.
     entry->mDate = aDate;
     entry->mKey = value;
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv   register-date [%p] %ld",
             aDate, value));
     return NS_OK;
 }
 nsresult
 RDFServiceImpl::UnregisterDate(nsIRDFDate* aDate)
 {
     PRTime value;
     aDate->GetValue(&value);
     NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(PL_DHashTableOperate(&mDates,
                                                              &value,
                                                              PL_DHASH_LOOKUP)),
                  "date was never registered");
     PL_DHashTableOperate(&mDates, &value, PL_DHASH_REMOVE);
     // N.B. that we _don't_ release the literal: we only held a weak
     // reference to it in the hashtable.
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv unregister-date [%p] %ld",
             aDate, value));
     return NS_OK;
 }
 nsresult
 RDFServiceImpl::RegisterBlob(BlobImpl *aBlob)
 {
     NS_ASSERTION(PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mBlobs,
                                                              &aBlob->mData,
                                                              PL_DHASH_LOOKUP)),
                  "blob already registered");
     PLDHashEntryHdr *hdr =
         PL_DHashTableOperate(&mBlobs, &aBlob->mData, PL_DHASH_ADD);
     if (! hdr)
         return NS_ERROR_OUT_OF_MEMORY;
     BlobHashEntry *entry = static_cast<BlobHashEntry *>(hdr);
     // N.B., we only hold a weak reference to the literal: that
     // way, the literal can be destroyed when the last refcount
     // goes away. The single addref that the CreateInt() call
     // made will be owned by the callee.
     entry->mBlob = aBlob;
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv   register-blob [%p] %s",
             aBlob, aBlob->mData.mBytes));
     return NS_OK;
 }
 nsresult
 RDFServiceImpl::UnregisterBlob(BlobImpl *aBlob)
 {
     NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(PL_DHashTableOperate(&mBlobs,
                                                              &aBlob->mData,
                                                              PL_DHASH_LOOKUP)),
                  "blob was never registered");
     PL_DHashTableOperate(&mBlobs, &aBlob->mData, PL_DHASH_REMOVE);
      // N.B. that we _don't_ release the literal: we only held a weak
      // reference to it in the hashtable.
     PR_LOG(gLog, PR_LOG_DEBUG,
            ("rdfserv unregister-blob [%p] %s",
             aBlob, aBlob->mData.mBytes));
     return NS_OK;
 }

The Tor Browser / annotate

rdf/base/src/nsRDFService.cpp@b8a032363ba2 (annotated)

rdf/base/src/nsRDFService.cpp