CarPresenter.java

/*
 * Copyright 2013 ArcBees Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.gwtplatform.carstore.client.application.cars.car;

import java.util.Arrays;
import java.util.List;

import javax.inject.Inject;

import com.google.gwt.user.client.Window;
import com.google.inject.assistedinject.Assisted;
import com.google.web.bindery.event.shared.EventBus;
import com.gwtplatform.carstore.client.application.cars.car.CarPresenter.MyView;
import com.gwtplatform.carstore.client.application.cars.car.navigation.NavigationTab;
import com.gwtplatform.carstore.client.application.cars.car.navigation.NavigationTabEvent;
import com.gwtplatform.carstore.client.application.cars.event.CarAddedEvent;
import com.gwtplatform.carstore.client.application.event.ActionBarEvent;
import com.gwtplatform.carstore.client.application.event.ChangeActionBarEvent;
import com.gwtplatform.carstore.client.application.event.ChangeActionBarEvent.ActionType;
import com.gwtplatform.carstore.client.application.event.DisplayMessageEvent;
import com.gwtplatform.carstore.client.application.event.GoBackEvent;
import com.gwtplatform.carstore.client.application.widget.message.Message;
import com.gwtplatform.carstore.client.application.widget.message.MessageStyle;
import com.gwtplatform.carstore.client.place.NameTokens;
import com.gwtplatform.carstore.client.resources.CarMessages;
import com.gwtplatform.carstore.client.util.AbstractRestCallback;
import com.gwtplatform.carstore.client.util.ErrorHandlerAsyncCallback;
import com.gwtplatform.carstore.shared.api.CarsResource;
import com.gwtplatform.carstore.shared.api.ManufacturersResource;
import com.gwtplatform.carstore.shared.dto.CarDto;
import com.gwtplatform.carstore.shared.dto.ManufacturerDto;
import com.gwtplatform.dispatch.rest.delegates.client.ResourceDelegate;
import com.gwtplatform.mvp.client.HasUiHandlers;
import com.gwtplatform.mvp.client.Presenter;
import com.gwtplatform.mvp.client.View;
import com.gwtplatform.mvp.client.proxy.PlaceManager;
import com.gwtplatform.mvp.client.proxy.ProxyPlace;
import com.gwtplatform.mvp.shared.proxy.PlaceRequest;

public class CarPresenter extends Presenter<MyView, CarPresenter.MyProxy>
        implements CarUiHandlers, NavigationTab, GoBackEvent.GoBackHandler, ActionBarEvent.ActionBarHandler {

    public interface MyView extends View, HasUiHandlers<CarUiHandlers> {
        void edit(CarDto carDto);

        void setAllowedManufacturers(List<ManufacturerDto> manufacturerDtos);

        void resetFields(CarDto carDto);

        void getCar();
    }

    public interface MyProxy extends ProxyPlace<CarPresenter> {
    }

    private final ResourceDelegate<CarsResource> carsDelegate;
    private final ResourceDelegate<ManufacturersResource> manufacturersDelegate;
    private final CarMessages messages;
    private final PlaceManager placeManager;
    private final CarProxyFactory carProxyFactory;

    private CarDto carDto;

    @Inject
    CarPresenter(
            EventBus eventBus,
            MyView view,
            ResourceDelegate<CarsResource> carsDelegate,
            ResourceDelegate<ManufacturersResource> manufacturersDelegate,
            PlaceManager placeManager,
            CarProxyFactory carProxyFactory,
            CarMessages messages,
            @Assisted MyProxy proxy,
            @Assisted CarDto carDto) {
        super(eventBus, view, proxy, RootCarPresenter.SLOT_CAR_CONTENT);

        this.carsDelegate = carsDelegate;
        this.manufacturersDelegate = manufacturersDelegate;
        this.messages = messages;
        this.placeManager = placeManager;
        this.carProxyFactory = carProxyFactory;
        this.carDto = carDto != null ? carDto : new CarDto();

        getView().setUiHandlers(this);
    }

    @Override
    public void onGoBack(GoBackEvent event) {
        placeManager.revealPlace(new PlaceRequest.Builder().nameToken(NameTokens.getCars()).build());
    }

    @Override
    public void onActionEvent(ActionBarEvent event) {
        if (event.isTheSameToken(NameTokens.NEW_CAR)) {
            if (event.getActionType() == ActionType.DONE) {
                getView().getCar();
            }
        } else if (event.isTheSameToken(carDto.getManufacturer().getName() + carDto.getModel())) {
            if (event.getActionType() == ActionType.UPDATE) {
                getView().getCar();
            } else if (event.getActionType() == ActionType.DELETE) {
                onDeleteCar();
            }
        }
    }

    @Override
    public void onCancel() {
        NavigationTabEvent.fireClose(this, this);
    }

    @Override
    public void onSave(final CarDto carDto) {
        carsDelegate
                .withCallback(new ErrorHandlerAsyncCallback<CarDto>(this) {
                    @Override
                    public void onSuccess(CarDto newCar) {
                        onCarSaved(carDto, newCar);
                    }
                })
                .saveOrCreate(carDto);
    }

    @Override
    public String getName() {
        if (carDto.getId() != null) {
            return carDto.getManufacturer().getName() + " " + carDto.getModel();
        } else {
            return "New car";
        }
    }

    @Override
    public String getToken() {
        return getProxy().getNameToken();
    }

    @Override
    public boolean isClosable() {
        return true;
    }

    @Override
    protected void onBind() {
        addRegisteredHandler(GoBackEvent.getType(), this);
        addRegisteredHandler(ActionBarEvent.getType(), this);
    }

    @Override
    protected void onReveal() {
        manufacturersDelegate
                .withCallback(
                        (AbstractRestCallback<List<ManufacturerDto>>) this::onGetManufacturerSuccess)
                .getManufacturers();

        Boolean createNew = placeManager.getCurrentPlaceRequest().matchesNameToken(NameTokens.NEW_CAR);
        List<ActionType> actions;
        if (createNew) {
            actions = Arrays.asList(ActionType.DONE);
            ChangeActionBarEvent.fire(this, actions, false);
        } else {
            actions = Arrays.asList(ActionType.DELETE, ActionType.UPDATE);
            ChangeActionBarEvent.fire(this, actions, false);
        }

        NavigationTabEvent.fireReveal(this, this);
    }

    private void onGetManufacturerSuccess(List<ManufacturerDto> manufacturerDtos) {
        getView().setAllowedManufacturers(manufacturerDtos);
        getView().edit(carDto);
    }

    private void onCarSaved(CarDto oldCar, CarDto newCar) {
        DisplayMessageEvent.fire(CarPresenter.this, new Message(messages.carSaved(), MessageStyle.SUCCESS));
        CarAddedEvent.fire(CarPresenter.this, newCar, oldCar.getId() == null);

        if (oldCar.getId() == null) {
            carDto = new CarDto();
            getView().resetFields(carDto);

            MyProxy proxy = carProxyFactory.create(newCar, newCar.getManufacturer().getName() + newCar.getModel());

            placeManager.revealPlace(new PlaceRequest.Builder().nameToken(proxy.getNameToken()).build());
        }
    }

    private void onDeleteCar() {
        Boolean confirm = Window.confirm("Are you sure you want to delete " + carDto.getModel() + "?");
        if (confirm) {
            carsDelegate
                    .withCallback(new ErrorHandlerAsyncCallback<Void>(this) {
                        @Override
                        public void onSuccess(Void nothing) {
                            NavigationTabEvent.fireClose(CarPresenter.this, CarPresenter.this);
                        }
                    })
                    .car(carDto.getId())
                    .delete();
        }
    }
}