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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 "IDBIndexBackendImpl.h"
#if ENABLE(INDEXED_DATABASE)
#include "IDBCallbacks.h"
#include "IDBCursorBackendImpl.h"
#include "IDBDatabaseBackendImpl.h"
#include "IDBDatabaseException.h"
#include "IDBKey.h"
#include "IDBKeyRange.h"
#include "IDBObjectStoreBackendImpl.h"
#include "SQLiteDatabase.h"
#include "SQLiteStatement.h"
namespace WebCore {
IDBIndexBackendImpl::IDBIndexBackendImpl(IDBObjectStoreBackendImpl* objectStore, int64_t id, const String& name, const String& keyPath, bool unique)
: m_objectStore(objectStore)
, m_id(id)
, m_name(name)
, m_keyPath(keyPath)
, m_unique(unique)
{
}
IDBIndexBackendImpl::~IDBIndexBackendImpl()
{
}
String IDBIndexBackendImpl::storeName()
{
return m_objectStore->name();
}
static void openCursorInternal(SQLiteDatabase& database, IDBIndexBackendImpl* index, IDBKeyRange* range, unsigned short untypedDirection, bool objectCursor, IDBCallbacks* callbacks)
{
// Several files depend on this order of selects.
String sql = String("SELECT IndexData.id, IndexData.keyString, IndexData.keyDate, IndexData.keyNumber, ")
+ (objectCursor ? "ObjectStoreData.value " : "ObjectStoreData.keyString, ObjectStoreData.keyDate, ObjectStoreData.keyNumber ")
+ "FROM IndexData INNER JOIN ObjectStoreData ON IndexData.objectStoreDataId = ObjectStoreData.id WHERE ";
bool leftBound = range && (range->flags() & IDBKeyRange::LEFT_BOUND || range->flags() == IDBKeyRange::SINGLE);
bool rightBound = range && (range->flags() & IDBKeyRange::RIGHT_BOUND || range->flags() == IDBKeyRange::SINGLE);
if (leftBound)
sql += range->left()->leftCursorWhereFragment(range->leftWhereClauseComparisonOperator(), "IndexData.");
if (rightBound)
sql += range->right()->rightCursorWhereFragment(range->rightWhereClauseComparisonOperator(), "IndexData.");
sql += "IndexData.indexId = ? ORDER BY ";
IDBCursor::Direction direction = static_cast<IDBCursor::Direction>(untypedDirection);
if (direction == IDBCursor::NEXT || direction == IDBCursor::NEXT_NO_DUPLICATE)
sql += "IndexData.keyString, IndexData.keyDate, IndexData.keyNumber, IndexData.id";
else
sql += "IndexData.keyString DESC, IndexData.keyDate DESC, IndexData.keyNumber DESC, IndexData.id DESC";
OwnPtr<SQLiteStatement> query = adoptPtr(new SQLiteStatement(database, sql));
bool ok = query->prepare() == SQLResultOk;
ASSERT_UNUSED(ok, ok); // FIXME: Better error handling?
int indexColumn = 1;
if (leftBound)
indexColumn += range->left()->bind(*query, indexColumn);
if (rightBound)
indexColumn += range->right()->bind(*query, indexColumn);
query->bindInt64(indexColumn, index->id());
if (query->step() != SQLResultRow) {
callbacks->onSuccess();
return;
}
RefPtr<IDBCursorBackendInterface> cursor = IDBCursorBackendImpl::create(index, range, direction, query.release(), objectCursor);
callbacks->onSuccess(cursor.release());
}
void IDBIndexBackendImpl::openObjectCursor(PassRefPtr<IDBKeyRange> keyRange, unsigned short direction, PassRefPtr<IDBCallbacks> callbacks)
{
openCursorInternal(sqliteDatabase(), this, keyRange.get(), direction, true, callbacks.get());
}
void IDBIndexBackendImpl::openCursor(PassRefPtr<IDBKeyRange> keyRange, unsigned short direction, PassRefPtr<IDBCallbacks> callbacks)
{
openCursorInternal(sqliteDatabase(), this, keyRange.get(), direction, false, callbacks.get());
}
static void getInternal(SQLiteDatabase& database, int64 id, IDBKey* key, bool getObject, IDBCallbacks* callbacks)
{
String sql = String("SELECT ")
+ (getObject ? "ObjectStoreData.value " : "ObjectStoreData.keyString, ObjectStoreData.keyDate, ObjectStoreData.keyNumber ")
+ "FROM IndexData INNER JOIN ObjectStoreData ON IndexData.objectStoreDataId = ObjectStoreData.id "
+ "WHERE IndexData.indexId = ? AND " + key->whereSyntax("IndexData.")
+ "ORDER BY IndexData.id LIMIT 1"; // Order by insertion order when all else fails.
SQLiteStatement query(database, sql);
bool ok = query.prepare() == SQLResultOk;
ASSERT_UNUSED(ok, ok); // FIXME: Better error handling?
query.bindInt64(1, id);
key->bind(query, 2);
if (query.step() != SQLResultRow) {
callbacks->onError(IDBDatabaseError::create(IDBDatabaseException::NOT_FOUND_ERR, "Key does not exist in the index."));
return;
}
if (getObject)
callbacks->onSuccess(SerializedScriptValue::createFromWire(query.getColumnText(0)));
else
callbacks->onSuccess(IDBKey::fromQuery(query, 0));
ASSERT(query.step() != SQLResultRow);
}
void IDBIndexBackendImpl::getObject(PassRefPtr<IDBKey> key, PassRefPtr<IDBCallbacks> callbacks)
{
getInternal(sqliteDatabase(), m_id, key.get(), true, callbacks.get());
}
void IDBIndexBackendImpl::get(PassRefPtr<IDBKey> key, PassRefPtr<IDBCallbacks> callbacks)
{
getInternal(sqliteDatabase(), m_id, key.get(), false, callbacks.get());
}
static String whereClause(IDBKey* key)
{
return "WHERE indexId = ? AND " + key->whereSyntax();
}
static void bindWhereClause(SQLiteStatement& query, int64_t id, IDBKey* key)
{
query.bindInt64(1, id);
key->bind(query, 2);
}
bool IDBIndexBackendImpl::addingKeyAllowed(IDBKey* key)
{
if (!m_unique)
return true;
SQLiteStatement query(sqliteDatabase(), "SELECT id FROM IndexData " + whereClause(key));
bool ok = query.prepare() == SQLResultOk;
ASSERT_UNUSED(ok, ok); // FIXME: Better error handling?
bindWhereClause(query, m_id, key);
bool existingValue = query.step() == SQLResultRow;
return !existingValue;
}
SQLiteDatabase& IDBIndexBackendImpl::sqliteDatabase() const
{
return m_objectStore->database()->sqliteDatabase();
}
} // namespace WebCore
#endif // ENABLE(INDEXED_DATABASE)
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