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src/FDM/JSBSim/math/FGParameterValue.h

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+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+  Header: FGParameterValue.h
+  Author: Bertrand Coconnier
+  Date started: December 09 2018
+
+  --------- Copyright (C) 2018  B. Coconnier (bcoconni@users.sf.net) -----------
+
+  This program 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 2 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 Lesser General Public License for more
+  details.
+
+  You should have received a copy of the GNU Lesser General Public License along
+  with this program; if not, write to the Free Software Foundation, Inc., 59
+  Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+  Further information about the GNU Lesser General Public License can also be
+  found on the world wide web at http://www.gnu.org.
+
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  SENTRY
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+#ifndef FGPARAMETERVALUE_H
+#define FGPARAMETERVALUE_H
+
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  INCLUDES
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+#include <stdexcept>
+
+#include "math/FGRealValue.h"
+#include "math/FGPropertyValue.h"
+#include "input_output/FGXMLElement.h"
+
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  FORWARD DECLARATIONS
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+namespace JSBSim {
+
+class FGPropertyManager;
+
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  CLASS DOCUMENTATION
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+/** Represents a either a real value or a property value
+    @author Bertrand Coconnier
+*/
+
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+  DECLARATION: FGParameterValue
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+class FGParameterValue : public FGParameter
+{
+public:
+  FGParameterValue(Element* el, FGPropertyManager* pm) {
+    string value = el->GetDataLine();
+
+    if (el->GetNumDataLines() != 1 || value.empty()) {
+      cerr << el->ReadFrom()
+           << "The element <" << el->GetName()
+           << "> must either contain a value number or a property name."
+           << endl;
+      throw invalid_argument("FGParameterValue: Illegal argument defining: " + el->GetName());
+    }
+
+    Construct(value, pm);
+  }
+
+  FGParameterValue(const std::string& value, FGPropertyManager* pm) {
+    Construct(value, pm);
+  }
+
+  double GetValue(void) const override { return param->GetValue(); }
+  bool IsConstant(void) const override { return param->IsConstant(); }
+
+  std::string GetName(void) const override {
+    FGPropertyValue* v = dynamic_cast<FGPropertyValue*>(param.ptr());
+    if (v)
+      return v->GetNameWithSign();
+    else
+      return to_string(param->GetValue());
+  }
+
+  bool IsLateBound(void) const {
+    FGPropertyValue* v = dynamic_cast<FGPropertyValue*>(param.ptr());
+    return v != nullptr && v->IsLateBound();
+  }
+private:
+  FGParameter_ptr param;
+
+  void Construct(const std::string& value, FGPropertyManager* pm) {
+    if (is_number(value)) {
+      param = new FGRealValue(atof(value.c_str()));
+    } else {
+      // "value" must be a property if execution passes to here.
+      param = new FGPropertyValue(value, pm);
+    }
+  }
+};
+
+typedef SGSharedPtr<FGParameterValue> FGParameterValue_ptr;
+
+} // namespace JSBSim
+
+#endif