es.uem.geoparser.client.AppController.java Source code

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Here is the source code for es.uem.geoparser.client.AppController.java

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/* Copyright (c) 2012 Guillermo Santos 
 *
 * 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 es.uem.geoparser.client;

import java.util.ArrayList;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.HasWidgets;

import es.uem.geoparser.client.presenter.GeoRSSPresenter;
import es.uem.geoparser.client.presenter.Presenter;
import es.uem.geoparser.client.view.MapView;
import es.uem.geoparser.client.view.MapViewImpl;
import es.uem.geoparser.shared.NewMap;

/**
 * Controlador para escuchar eventos y tomar acciones relevantes.
 *  
 * @author Guillermo Santos (gsantosgo@yahoo.es)
 */
public class AppController implements Presenter, ValueChangeHandler<String> {
    private final HandlerManager eventBus;
    private final GeoRSSServiceAsync geoRSSService;
    private MapViewImpl<NewMap> mapView = null;
    private HasWidgets container;

    /**
     * Constructor Controlador 
     * 
     * @param geoRSSService Servicio GeoRSS
     * @param eventBus
     */
    public AppController(GeoRSSServiceAsync geoRSSService, HandlerManager eventBus) {
        super();
        this.geoRSSService = geoRSSService;
        this.eventBus = eventBus;
        bind();
    }

    private void bind() {
        History.addValueChangeHandler(this);
    }

    @Override
    public void onValueChange(ValueChangeEvent<String> event) {
        String token = event.getValue();

        if (token != null) {
            if (token.equals("display")) {
                GWT.runAsync(new RunAsyncCallback() {
                    public void onFailure(Throwable caught) {
                    }

                    public void onSuccess() {
                        // lazily initialize our views, and keep them around to be reused
                        //
                        if (mapView == null) {
                            mapView = new MapViewImpl<NewMap>();
                        }
                        new GeoRSSPresenter(geoRSSService, eventBus, mapView).go(container);
                    }
                });
            }
        }
    }

    @Override
    public void go(HasWidgets container) {
        this.container = container;

        if ("".equals(History.getToken())) {
            History.newItem("display");
        } else {
            History.fireCurrentHistoryState();
        }
    }
}