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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "../../Include/Rocket/Controls/DataQuery.h"
#include "../../Include/Rocket/Controls/DataSource.h"
#include <algorithm>
namespace Rocket {
namespace Controls {
class DataQuerySort
{
public:
DataQuerySort(const Rocket::Core::StringList& _order_parameters)
{
order_parameters = _order_parameters;
}
bool operator()(const Rocket::Core::StringList& ROCKET_UNUSED_PARAMETER(left), const Rocket::Core::StringList& ROCKET_UNUSED_PARAMETER(right))
{
ROCKET_UNUSED(left);
ROCKET_UNUSED(right);
return false;
}
private:
Rocket::Core::StringList order_parameters;
};
DataQuery::DataQuery(DataSource* data_source, const Rocket::Core::String& table, const Rocket::Core::String& _fields, int offset, int limit, const Rocket::Core::String& order)
{
ExecuteQuery(data_source, table, _fields, offset, limit, order);
}
DataQuery::DataQuery()
{
data_source = NULL;
table = "";
offset = -1;
limit = -1;
}
DataQuery::~DataQuery()
{
}
void DataQuery::ExecuteQuery(DataSource* _data_source, const Rocket::Core::String& _table, const Rocket::Core::String& _fields, int _offset, int _limit, const Rocket::Core::String& order)
{
data_source = _data_source;
table = _table;
offset = _offset;
limit = _limit;
// Set up the field list and field index cache.
Rocket::Core::StringUtilities::ExpandString(fields, _fields);
for (size_t i = 0; i < fields.size(); i++)
{
field_indices[fields[i]] = i;
}
// Initialise the row pointer.
current_row = -1;
// If limit is -1, then we fetch to the end of the data source.
if (limit == -1)
{
limit = data_source->GetNumRows(table) - offset;
}
if (!order.Empty())
{
// Fetch the rows from offset to limit.
rows.resize(limit);
for (int i = 0; i < limit; i++)
{
data_source->GetRow(rows[i], table, offset + i, fields);
}
// Now sort the rows, based on the ordering requirements.
Rocket::Core::StringList order_parameters;
Rocket::Core::StringUtilities::ExpandString(order_parameters, order);
sort(rows.begin(), rows.end(), DataQuerySort(order_parameters));
}
}
bool DataQuery::NextRow()
{
current_row++;
if (current_row >= limit)
{
return false;
}
LoadRow();
return true;
}
bool DataQuery::IsFieldSet(const Rocket::Core::String& field) const
{
FieldIndices::const_iterator itr = field_indices.find(field);
if (itr == field_indices.end() || (*itr).second >= (int)rows[current_row].size())
{
return false;
}
return true;
}
void DataQuery::LoadRow()
{
ROCKET_ASSERT(current_row <= (int)rows.size());
if (current_row >= (int)rows.size())
{
rows.push_back(Rocket::Core::StringList());
data_source->GetRow(rows[current_row], table, offset + current_row, fields);
}
}
}
}
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