qt/widgets/datasource/explorer/DataSetItem.cpp

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/*  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

    This file is part of the TerraLib - a Framework for building GIS enabled applications.

    TerraLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License,
    or (at your option) any later version.

    TerraLib is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TerraLib. See COPYING. If not, write to
    TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file terralib/qt/widgets/datasource/explorer/DataSetItem.cpp

  \brief A class that represents a dataset in a TreeModel.
*/

// TerraLib
#include "../../../../core/translator/Translator.h"
#include "../../../../dataaccess/Enums.h"
#include "../../../../dataaccess/dataset/DataSetType.h"
#include "../../../../dataaccess/datasource/DataSource.h"
#include "../../../../dataaccess/datasource/DataSourceCatalog.h"
#include "../../../../dataaccess/utils/Utils.h"
#include "../../datasource/explorer/DataSetGroupItem.h"
#include "../../Exception.h"
#include "ConstraintsItem.h"
#include "DataSetItem.h"
#include "IndexGroupItem.h"
#include "PropertyGroupItem.h"

// STL
#include <memory>

// Qt
#include <QMenu>
#include <QWidget>

te::qt::widgets::DataSetItem::DataSetItem(const std::string& name, te::da::DataSource* ds, AbstractDataSourceTreeItem* parent)
  : AbstractDataSourceTreeItem(parent),
  m_datasource(ds),
  m_checked(false),
  m_name(name)
{
}

te::qt::widgets::DataSetItem::~DataSetItem() = default;

int te::qt::widgets::DataSetItem::columnCount() const
{
  return 1;
}

QVariant te::qt::widgets::DataSetItem::data(int /*column*/, int role) const
{
  if(role == Qt::DisplayRole)
  {
    return QVariant((m_name).c_str());
  }

  if(role == Qt::CheckStateRole)
    return QVariant(m_checked ? Qt::Checked : Qt::Unchecked);

  return QVariant();
}

QMenu* te::qt::widgets::DataSetItem::getMenu(QWidget* parent) const
{
  QMenu* m = new QMenu(parent);

  QAction* aOpenDataSet = m->addAction(tr("&Open dataset"));

  connect(aOpenDataSet, SIGNAL(triggered()), this, SLOT(openDataSet()));

  return m;
}

bool te::qt::widgets::DataSetItem::canFetchMore() const
{
  if(!children().empty())
    return false;

  return hasChildren();
}

Qt::ItemFlags te::qt::widgets::DataSetItem::flags() const
{
  return Qt::ItemIsUserCheckable;
}

void te::qt::widgets::DataSetItem::fetchMore()
{
  if(!m_dataset.get())
    m_dataset.reset(m_datasource->getDataSetType(m_name).release());

  if (!m_dataset.get())
    return;

  if(m_dataset->size() != 0)
    new PropertyGroupItem(this);

  if ((m_dataset->getNumberOfCheckConstraints() != 0) ||
      (m_dataset->getNumberOfUniqueKeys() != 0) ||
      (m_dataset->getPrimaryKey() != nullptr))
    new ConstraintsItem(this);

  if(m_dataset->getNumberOfIndexes() != 0)
    new IndexGroupItem(this);
}

bool te::qt::widgets::DataSetItem::hasChildren() const
{
  if(m_datasource == nullptr)
    return false;

  return true;  // assume at least one property will exist! otherwise we need to use catalog loader!
}

bool te::qt::widgets::DataSetItem::setData(const QVariant& value, int role)
{
  if(role == Qt::CheckStateRole)
  {
    m_checked = value.toBool();

    DataSetGroupItem* p = dynamic_cast<DataSetGroupItem*>(parent());

    p->checkState();

    return true;
  }

  return false;
}

const te::da::DataSetTypePtr& te::qt::widgets::DataSetItem::getDataSet()
{
  if (!m_dataset.get())
    m_dataset.reset(m_datasource->getDataSetType(m_name).release());

  return m_dataset;
}

std::string te::qt::widgets::DataSetItem::getGeomPropertyName()
{
  if(!m_dataset.get())
    m_dataset.reset(m_datasource->getDataSetType(m_name).release());

  te::dt::Property* geomProp = te::da::GetFirstSpatialProperty(m_dataset.get());
  if (geomProp)
    return geomProp->getName();

  return "";
}

te::da::DataSource* te::qt::widgets::DataSetItem::getDataSource() const
{
  return m_datasource;
}

bool te::qt::widgets::DataSetItem::isChecked() const
{
  return m_checked;
}