-\f
-////////////////////////////////////////////////////////////////////////
-// Conditions.
-////////////////////////////////////////////////////////////////////////
-
-
-/**
- * An encoded condition.
- *
- * This class encodes a single condition of some sort, possibly
- * connected with properties.
- *
- * This class should migrate to somewhere more general.
- */
-class FGCondition
-{
-public:
- FGCondition ();
- virtual ~FGCondition ();
- virtual bool test () const = 0;
-};
-
-
-/**
- * Condition for a single property.
- *
- * This condition is true only if the property returns a boolean
- * true value.
- */
-class FGPropertyCondition : public FGCondition
-{
-public:
- FGPropertyCondition (const string &propname);
- virtual ~FGPropertyCondition ();
- virtual bool test () const { return _node->getBoolValue(); }
-private:
- const SGPropertyNode * _node;
-};
-
-
-/**
- * Condition for a 'not' operator.
- *
- * This condition is true only if the child condition is false.
- */
-class FGNotCondition : public FGCondition
-{
-public:
- // transfer pointer ownership
- FGNotCondition (FGCondition * condition);
- virtual ~FGNotCondition ();
- virtual bool test () const;
-private:
- FGCondition * _condition;
-};
-
-
-/**
- * Condition for an 'and' group.
- *
- * This condition is true only if all of the conditions
- * in the group are true.
- */
-class FGAndCondition : public FGCondition
-{
-public:
- FGAndCondition ();
- virtual ~FGAndCondition ();
- virtual bool test () const;
- // transfer pointer ownership
- virtual void addCondition (FGCondition * condition);
-private:
- vector<FGCondition *> _conditions;
-};
-
-
-/**
- * Condition for an 'or' group.
- *
- * This condition is true if at least one of the conditions in the
- * group is true.
- */
-class FGOrCondition : public FGCondition
-{