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/*
* 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
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "IDBCursorBackendImpl.h"
#if ENABLE(INDEXED_DATABASE)
#include "CrossThreadTask.h"
#include "IDBCallbacks.h"
#include "IDBDatabaseBackendImpl.h"
#include "IDBDatabaseError.h"
#include "IDBDatabaseException.h"
#include "IDBIndexBackendImpl.h"
#include "IDBKeyRange.h"
#include "IDBObjectStoreBackendImpl.h"
#include "IDBRequest.h"
#include "IDBSQLiteDatabase.h"
#include "IDBTransactionBackendInterface.h"
#include "SQLiteDatabase.h"
#include "SQLiteStatement.h"
#include "SerializedScriptValue.h"
namespace WebCore {
IDBCursorBackendImpl::IDBCursorBackendImpl(IDBSQLiteDatabase* database, PassRefPtr<IDBKeyRange> keyRange, IDBCursor::Direction direction, PassOwnPtr<SQLiteStatement> query, bool isSerializedScriptValueCursor, IDBTransactionBackendInterface* transaction, IDBObjectStoreBackendInterface* objectStore)
: m_database(database)
, m_keyRange(keyRange)
, m_direction(direction)
, m_query(query)
, m_isSerializedScriptValueCursor(isSerializedScriptValueCursor)
, m_transaction(transaction)
, m_objectStore(objectStore)
{
loadCurrentRow();
}
IDBCursorBackendImpl::~IDBCursorBackendImpl()
{
}
unsigned short IDBCursorBackendImpl::direction() const
{
return m_direction;
}
PassRefPtr<IDBKey> IDBCursorBackendImpl::key() const
{
return m_currentKey;
}
PassRefPtr<IDBAny> IDBCursorBackendImpl::value() const
{
if (m_isSerializedScriptValueCursor)
return IDBAny::create(m_currentSerializedScriptValue.get());
return IDBAny::create(m_currentIDBKeyValue.get());
}
void IDBCursorBackendImpl::update(PassRefPtr<SerializedScriptValue> value, PassRefPtr<IDBCallbacks> callbacks, ExceptionCode& ec)
{
if (!m_query || m_currentId == InvalidId || !m_isSerializedScriptValueCursor) {
ec = IDBDatabaseException::NOT_ALLOWED_ERR;
return;
}
RefPtr<IDBKey> key = m_currentIDBKeyValue ? m_currentIDBKeyValue : m_currentKey;
m_objectStore->put(value, key.release(), IDBObjectStoreBackendInterface::CursorUpdate, callbacks, m_transaction.get(), ec);
}
void IDBCursorBackendImpl::continueFunction(PassRefPtr<IDBKey> prpKey, PassRefPtr<IDBCallbacks> prpCallbacks, ExceptionCode& ec)
{
RefPtr<IDBCursorBackendImpl> cursor = this;
RefPtr<IDBKey> key = prpKey;
RefPtr<IDBCallbacks> callbacks = prpCallbacks;
if (!m_transaction->scheduleTask(createCallbackTask(&IDBCursorBackendImpl::continueFunctionInternal, cursor, key, callbacks)))
ec = IDBDatabaseException::NOT_ALLOWED_ERR;
}
bool IDBCursorBackendImpl::currentRowExists()
{
String sql = m_currentIDBKeyValue ? "SELECT id FROM IndexData WHERE id = ?" : "SELECT id FROM ObjectStoreData WHERE id = ?";
SQLiteStatement statement(m_database->db(), sql);
bool ok = statement.prepare() == SQLResultOk;
ASSERT_UNUSED(ok, ok);
statement.bindInt64(1, m_currentId);
return statement.step() == SQLResultRow;
}
// IMPORTANT: If this ever 1) fires an 'error' event and 2) it's possible to fire another event afterwards,
// IDBRequest::hasPendingActivity() will need to be modified to handle this!!!
void IDBCursorBackendImpl::continueFunctionInternal(ScriptExecutionContext*, PassRefPtr<IDBCursorBackendImpl> prpCursor, PassRefPtr<IDBKey> prpKey, PassRefPtr<IDBCallbacks> callbacks)
{
RefPtr<IDBCursorBackendImpl> cursor = prpCursor;
RefPtr<IDBKey> key = prpKey;
while (true) {
if (!cursor->m_query || cursor->m_query->step() != SQLResultRow) {
cursor->m_query = 0;
cursor->m_currentId = InvalidId;
cursor->m_currentKey = 0;
cursor->m_currentSerializedScriptValue = 0;
cursor->m_currentIDBKeyValue = 0;
callbacks->onSuccess(SerializedScriptValue::nullValue());
return;
}
RefPtr<IDBKey> oldKey = cursor->m_currentKey;
cursor->loadCurrentRow();
// Skip if this entry has been deleted from the object store.
if (!cursor->currentRowExists())
continue;
// If a key was supplied, we must loop until we find that key (or hit the end).
if (key && !key->isEqual(cursor->m_currentKey.get()))
continue;
// If we don't have a uniqueness constraint, we can stop now.
if (cursor->m_direction == IDBCursor::NEXT || cursor->m_direction == IDBCursor::PREV)
break;
if (!cursor->m_currentKey->isEqual(oldKey.get()))
break;
}
callbacks->onSuccess(cursor.get());
}
void IDBCursorBackendImpl::deleteFunction(PassRefPtr<IDBCallbacks> prpCallbacks, ExceptionCode& ec)
{
if (!m_query || m_currentId == InvalidId || !m_isSerializedScriptValueCursor) {
ec = IDBDatabaseException::NOT_ALLOWED_ERR;
return;
}
RefPtr<IDBKey> key = m_currentIDBKeyValue ? m_currentIDBKeyValue : m_currentKey;
m_objectStore->deleteFunction(key.release(), prpCallbacks, m_transaction.get(), ec);
}
void IDBCursorBackendImpl::loadCurrentRow()
{
// The column numbers depend on the query in IDBObjectStoreBackendImpl::openCursorInternal or
// IDBIndexBackendImpl::openCursorInternal.
m_currentId = m_query->getColumnInt64(0);
m_currentKey = IDBKey::fromQuery(*m_query, 1);
if (m_isSerializedScriptValueCursor)
m_currentSerializedScriptValue = SerializedScriptValue::createFromWire(m_query->getColumnBlobAsString(4));
m_currentIDBKeyValue = IDBKey::fromQuery(*m_query, 5);
}
SQLiteDatabase& IDBCursorBackendImpl::database() const
{
return m_database->db();
}
} // namespace WebCore
#endif // ENABLE(INDEXED_DATABASE)
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