Add new experimental IDBObjectStore.getKey(query) API

third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.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 96 matching lines @@
     if (!keyRange) {
         exceptionState.throwDOMException(DataError, IDBDatabase::noKeyOrKeyRangeErrorMessage);
         return nullptr;
     }
     if (!backendDB()) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::databaseClosedErrorMessage);
         return nullptr;
     }
 
     IDBRequest* request = IDBRequest::create(scriptState, IDBAny::create(this), m_transaction.get());
-    backendDB()->get(m_transaction->id(), id(), IDBIndexMetadata::InvalidId, keyRange, false, WebIDBCallbacksImpl::create(request).release());
+    backendDB()->get(m_transaction->id(), id(), IDBIndexMetadata::InvalidId, keyRange, false /* keyOnly */, WebIDBCallbacksImpl::create(request).release());
     return request;
 }
 
+IDBRequest* IDBObjectStore::getKey(ScriptState* scriptState, const ScriptValue& key, ExceptionState& exceptionState)
+{
+    IDB_TRACE("IDBObjectStore::getKey");
+    if (isDeleted()) {
+        exceptionState.throwDOMException(InvalidStateError, IDBDatabase::objectStoreDeletedErrorMessage);
+        return nullptr;
+    }
+    if (m_transaction->isFinished() || m_transaction->isFinishing()) {
+        exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionFinishedErrorMessage);
+        return nullptr;
+    }
+    if (!m_transaction->isActive()) {
+        exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionInactiveErrorMessage);
+        return nullptr;
+    }
+    IDBKeyRange* keyRange = IDBKeyRange::fromScriptValue(scriptState->getExecutionContext(), key, exceptionState);
+    if (exceptionState.hadException())
+        return nullptr;
+    if (!keyRange) {
+        exceptionState.throwDOMException(DataError, IDBDatabase::noKeyOrKeyRangeErrorMessage);
+        return nullptr;
+    }
+    if (!backendDB()) {
+        exceptionState.throwDOMException(InvalidStateError, IDBDatabase::databaseClosedErrorMessage);
+        return nullptr;
+    }
+
+    IDBRequest* request = IDBRequest::create(scriptState, IDBAny::create(this), m_transaction.get());
+    backendDB()->get(m_transaction->id(), id(), IDBIndexMetadata::InvalidId, keyRange, true /* keyOnly */, WebIDBCallbacksImpl::create(request).release());
+    return request;
+}
+
 IDBRequest* IDBObjectStore::getAll(ScriptState* scriptState, const ScriptValue& keyRange, ExceptionState& exceptionState)
 {
     return getAll(scriptState, keyRange, std::numeric_limits<uint32_t>::max(), exceptionState);
 }
 
 IDBRequest* IDBObjectStore::getAll(ScriptState* scriptState, const ScriptValue& keyRange, unsigned long maxCount, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBObjectStore::getAll");
     if (!maxCount)
         maxCount = std::numeric_limits<uint32_t>::max();
@@ skipping 628 matching lines @@
     }
     return IDBIndexMetadata::InvalidId;
 }
 
 WebIDBDatabase* IDBObjectStore::backendDB() const
 {
     return m_transaction->backendDB();
 }
 
 } // namespace blink