Exemplo n.º 1
0
  @Override
  public DevToolsState<S> reduce(DevToolsState<S> state, Action action) {
    if (!(action instanceof DevToolsAction)) {
      throw new IllegalArgumentException(
          "When using the Dev Tools, all actions must be wrapped as a DevToolsAction");
    }

    DevToolsAction devToolsAction = (DevToolsAction) action;

    switch (devToolsAction.getType()) {
      case DevToolsAction.INIT:
        final S initialState = appReducer.reduce(state.getCurrentAppState(), action);

        return new DevToolsState<>(
            Collections.singletonList(initialState), Collections.singletonList(action), 0);

      case DevToolsAction.PERFORM_ACTION:
        final boolean addToEnd = state.getCurrentPosition() == state.getComputedStates().size() - 1;

        return performAction(
            state,
            devToolsAction,
            addToEnd
                ? state.getComputedStates()
                : state.getComputedStates().subList(0, state.getCurrentPosition() + 1),
            addToEnd
                ? state.getStagedActions()
                : state.getStagedActions().subList(0, state.getCurrentPosition() + 1));

      case DevToolsAction.RESET:
        return new DevToolsState<>(
            Collections.singletonList(state.getCommittedState()),
            Collections.<Action>singletonList(devToolsAction),
            0);

      case DevToolsAction.SAVE:
        return new DevToolsState<>(
            Collections.singletonList(state.getCurrentAppState()),
            Collections.singletonList(action),
            0);

      case DevToolsAction.JUMP_TO_STATE:
        return new DevToolsState<>(
            state.getComputedStates(), state.getStagedActions(), devToolsAction.getPosition());

      case DevToolsAction.RECOMPUTE:
        return new DevToolsState<>(
            recomputeStates(state.getComputedStates(), state.getStagedActions()),
            state.getStagedActions(),
            state.getStagedActions().size() - 1);

      default:
        return state;
    }
  }
Exemplo n.º 2
0
  private List<S> recomputeStates(List<S> computedStates, List<Action> stagedActions) {
    List<S> recomputedStates = new ArrayList<>(computedStates.size());
    S currentState = computedStates.get(0);

    for (int i = 0; i < computedStates.size(); i++) {
      Action currentAction = stagedActions.get(i);
      currentState = appReducer.reduce(currentState, currentAction);
      recomputedStates.add(currentState);
    }

    return recomputedStates;
  }
Exemplo n.º 3
0
  private DevToolsState<S> performAction(
      DevToolsState<S> state,
      DevToolsAction devToolsAction,
      List<S> computedStates,
      List<Action> stagedActions) {
    List<S> newStates = new ArrayList<>(computedStates);
    List<Action> newActions = new ArrayList<>(stagedActions);

    newStates.add(appReducer.reduce(state.getCurrentAppState(), devToolsAction.getAppAction()));
    newActions.add(devToolsAction.getAppAction());

    return new DevToolsState<>(newStates, newActions, newStates.size() - 1);
  }