LibrePCB

/*
 * LibrePCB - Professional EDA for everyone!
 * Copyright (C) 2013 LibrePCB Developers, see AUTHORS.md for contributors.
 * https://librepcb.org/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*******************************************************************************
 *  Includes
 ******************************************************************************/
#include "attributeprovider.h"

#include <QtCore>

/*******************************************************************************
 *  Namespace
 ******************************************************************************/
namespace librepcb {

/*******************************************************************************
 *  Public Methods
 ******************************************************************************/

QString AttributeProvider::getAttributeValue(const QString& key) const
    noexcept {
  QVector<const AttributeProvider*> backtrace;  // for endless loop detection
  return getAttributeValue(key, backtrace);
}

/*******************************************************************************
 *  Private Methods
 ******************************************************************************/

QString AttributeProvider::getAttributeValue(
    const QString& key, QVector<const AttributeProvider*>& backtrace) const
    noexcept {
  // priority 1: user defined attributes of this object
  QString value = getUserDefinedAttributeValue(key);
  if (!value.isEmpty()) return value;

  // priority 2: built-in attributes of this object
  value = getBuiltInAttributeValue(key);
  if (!value.isEmpty()) return value;

  // priority 3: attributes from all parent objects in specific order
  backtrace.append(this);
  foreach (const AttributeProvider* parent, getAttributeProviderParents()) {
    if (parent &&
        (!backtrace.contains(parent))) {  // break possible endless loop
      value = parent->getAttributeValue(key, backtrace);
      if (!value.isEmpty()) return value;
    }
  }

  // attribute not set...
  return QString();
}

/*******************************************************************************
 *  End of File
 ******************************************************************************/

}  // namespace librepcb