IndexedDB: Replace 0 with nullptr where appropriate

Source/modules/indexeddb/IDBDatabase.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 171 matching lines @@
     else
         result.setUnsignedLongLong(m_metadata.intVersion);
 }
 
 IDBObjectStore* IDBDatabase::createObjectStore(const String& name, const IDBKeyPath& keyPath, bool autoIncrement, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBDatabase::createObjectStore");
     Platform::current()->histogramEnumeration("WebCore.IndexedDB.FrontEndAPICalls", IDBCreateObjectStoreCall, IDBMethodsMax);
     if (!m_versionChangeTransaction) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::notVersionChangeTransactionErrorMessage);
-        return 0;
+        return nullptr;
     }
     if (m_versionChangeTransaction->isFinished() || m_versionChangeTransaction->isFinishing()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionFinishedErrorMessage);
-        return 0;
+        return nullptr;
     }
     if (!m_versionChangeTransaction->isActive()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionInactiveErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     if (containsObjectStore(name)) {
         exceptionState.throwDOMException(ConstraintError, "An object store with the specified name already exists.");
-        return 0;
+        return nullptr;
     }
 
     if (!keyPath.isNull() && !keyPath.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "The keyPath option is not a valid key path.");
-        return 0;
+        return nullptr;
     }
 
     if (autoIncrement && ((keyPath.type() == IDBKeyPath::StringType && keyPath.string().isEmpty()) || keyPath.type() == IDBKeyPath::ArrayType)) {
         exceptionState.throwDOMException(InvalidAccessError, "The autoIncrement option was set but the keyPath option was empty or an array.");
-        return 0;
+        return nullptr;
     }
 
     if (!m_backend) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::databaseClosedErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     int64_t objectStoreId = m_metadata.maxObjectStoreId + 1;
     m_backend->createObjectStore(m_versionChangeTransaction->id(), objectStoreId, name, keyPath, autoIncrement);
 
     IDBObjectStoreMetadata metadata(name, objectStoreId, keyPath, autoIncrement, WebIDBDatabase::minimumIndexId);
     IDBObjectStore* objectStore = IDBObjectStore::create(metadata, m_versionChangeTransaction.get());
     m_metadata.objectStores.set(metadata.id, metadata);
     ++m_metadata.maxObjectStoreId;
 
@@ skipping 48 matching lines @@
     } else if (storeNames.isDOMStringList()) {
         const Vector<String>& list = *storeNames.getAsDOMStringList();
         for (const String& name : list)
             scope.add(name);
     } else {
         ASSERT_NOT_REACHED();
     }
 
     if (scope.isEmpty()) {
         exceptionState.throwDOMException(InvalidAccessError, "The storeNames parameter was empty.");
-        return 0;
+        return nullptr;
     }
 
     WebIDBTransactionMode mode = IDBTransaction::stringToMode(modeString, exceptionState);
     if (exceptionState.hadException())
-        return 0;
+        return nullptr;
 
     if (m_versionChangeTransaction) {
         exceptionState.throwDOMException(InvalidStateError, "A version change transaction is running.");
-        return 0;
+        return nullptr;
     }
 
     if (m_closePending) {
         exceptionState.throwDOMException(InvalidStateError, "The database connection is closing.");
-        return 0;
+        return nullptr;
     }
 
     Vector<int64_t> objectStoreIds;
     for (const String& name : scope) {
         int64_t objectStoreId = findObjectStoreId(name);
         if (objectStoreId == IDBObjectStoreMetadata::InvalidId) {
             exceptionState.throwDOMException(NotFoundError, "One of the specified object stores was not found.");
-            return 0;
+            return nullptr;
         }
         objectStoreIds.append(objectStoreId);
     }
 
     if (!m_backend) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::databaseClosedErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     int64_t transactionId = nextTransactionId();
     m_backend->createTransaction(transactionId, WebIDBDatabaseCallbacksImpl::create(m_databaseCallbacks).leakPtr(), objectStoreIds, mode);
 
     return IDBTransaction::create(scriptState, transactionId, scope, mode, this);
 }
 
 void IDBDatabase::forceClose()
 {
@@ skipping 119 matching lines @@
 {
     return EventTargetNames::IDBDatabase;
 }
 
 ExecutionContext* IDBDatabase::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 } // namespace blink