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#ifndef _KEY_VALUE_OBSERVER_H_
#define _KEY_VALUE_OBSERVER_H_
#include "ientity.h"
#include <memory>
class INamespace;
namespace entity {
/**
* greebo: This class observers a single EntityKeyValue and catches
* any values that refer to a name in the attached namespace.
*
* During an EntityKeyValue's lifetime, the value might be changed
* to another entity's name. This case needs to be detected and an
* observer relationship needs to be established between the KeyValue
* and the Namespace, which is what this class takes care of.
*/
class KeyValueObserver :
public KeyObserver
{
private:
EntityKeyValue& _keyValue;
// The namespace we're supposed to notify
INamespace* _namespace;
// Is TRUE while the EntityKeyValue is an active NameObserver
bool _observing;
// This is needed to de-register the value on change again
std::string _observedValue;
public:
KeyValueObserver(EntityKeyValue& keyValue, INamespace* ns);
~KeyValueObserver();
// This gets called when the observed KeyValue changes.
void onKeyValueChanged(const std::string& newValue);
};
typedef std::shared_ptr<KeyValueObserver> KeyValueObserverPtr;
} // namespace entity
#endif /* _KEY_VALUE_OBSERVER_H_ */
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