1 | /*
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2 | * Reaction.hpp
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3 | *
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4 | * Created on: Oct 13, 2011
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5 | * Author: heber
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6 | */
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7 |
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8 | #ifndef REACTION_HPP_
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9 | #define REACTION_HPP_
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10 |
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11 | // include config.h
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12 | #ifdef HAVE_CONFIG_H
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13 | #include <config.h>
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14 | #endif
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15 |
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16 |
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17 | #include "Actions/Action.hpp"
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18 |
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19 | namespace MoleCuilder {
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20 |
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21 | /**
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22 | * A Reaction is an Action with a return value that is set during the call and may be
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23 | * inspected afterwards.
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24 | *
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25 | * This class can be used in the same way as any other Action, but has some special methods
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26 | * for inspecting the result of the calculation.
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27 | */
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28 | template<typename T>
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29 | class Reaction : public Action
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30 | {
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31 | public:
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32 | Reaction(const ActionTrait &_trait);
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33 | virtual ~Reaction();
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34 |
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35 | /**
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36 | * Reimplemented call method for Action Base class.
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37 | * Resets the result and then redoes the calculation. Can be used to retrigger calculations
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38 | * from menu Items or other places.
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39 | */
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40 | virtual bool canUndo();
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41 |
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42 | virtual bool shouldUndo();
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43 |
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44 | virtual void outputAsCLI(std::ostream &ost) const;
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45 | virtual void outputAsPython(std::ostream &ost, const std::string &prefix) const;
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46 |
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47 | /**
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48 | * Does the actual calculation and returns the result.
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49 | * When the calculation has been done before it is not redone, but the previous cached result is returned.
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50 | * Call reset to delete the cached value.
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51 | */
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52 | virtual T operator()();
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53 |
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54 | /**
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55 | * Check if a cached result is available.
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56 | */
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57 | virtual bool hasResult() const;
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58 |
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59 | /**
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60 | * Get the cached result.
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61 | * Fails if there is no cached result.
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62 | */
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63 | virtual T getResult() const;
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64 |
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65 | /**
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66 | * Delete a previously calculated result from the cache.
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67 | */
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68 | virtual void reset();
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69 |
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70 | protected:
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71 | virtual Dialog *fillDialog(Dialog *dialog)=0;
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72 |
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73 | protected:
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74 | //!> result of the calculation
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75 | T* result;
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76 |
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77 | /**
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78 | * Pure virtual method for implementation of the actual calculation procedure.
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79 | */
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80 | virtual T* doCalc()=0;
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81 | private:
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82 | virtual ActionState::ptr performCall();
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83 | virtual ActionState::ptr performUndo(ActionState::ptr);
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84 | virtual ActionState::ptr performRedo(ActionState::ptr);
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85 |
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86 | //!> states whether result is done or not (i.e. \a result contains valid result
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87 | bool done;
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88 | };
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89 |
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90 | }
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91 |
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92 | #endif /* REACTION_HPP_ */
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