Java tutorial
/* * Copyright (c) 2016 Washington State Department of Transportation * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> * */ package gov.wa.wsdot.mobile.client.activities.ferries.schedules; import com.google.code.gwt.database.client.GenericRow; import com.google.code.gwt.database.client.service.DataServiceException; import com.google.code.gwt.database.client.service.ListCallback; import com.google.code.gwt.database.client.service.RowIdListCallback; import com.google.code.gwt.database.client.service.VoidCallback; import com.google.gwt.i18n.client.DateTimeFormat; import com.google.gwt.json.client.JSONArray; import com.google.gwt.jsonp.client.JsonpRequestBuilder; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.AcceptsOneWidget; import com.google.web.bindery.event.shared.EventBus; import com.googlecode.gwtphonegap.client.PhoneGap; import com.googlecode.gwtphonegap.client.notification.AlertCallback; import com.googlecode.mgwt.mvp.client.MGWTAbstractActivity; import com.googlecode.mgwt.ui.client.widget.panel.pull.PullArrowStandardHandler; import com.googlecode.mgwt.ui.client.widget.panel.pull.PullArrowStandardHandler.PullActionHandler; import gov.wa.wsdot.mobile.client.ClientFactory; import gov.wa.wsdot.mobile.client.activities.ferries.schedules.sailings.FerriesRouteSailingsPlace; import gov.wa.wsdot.mobile.client.event.ActionEvent; import gov.wa.wsdot.mobile.client.event.ActionNames; import gov.wa.wsdot.mobile.client.plugins.accessibility.Accessibility; import gov.wa.wsdot.mobile.client.plugins.analytics.Analytics; import gov.wa.wsdot.mobile.client.service.WSDOTContract.CachesColumns; import gov.wa.wsdot.mobile.client.service.WSDOTContract.FerriesSchedulesColumns; import gov.wa.wsdot.mobile.client.service.WSDOTDataService; import gov.wa.wsdot.mobile.client.service.WSDOTDataService.Tables; import gov.wa.wsdot.mobile.client.util.Consts; import gov.wa.wsdot.mobile.shared.CacheItem; import gov.wa.wsdot.mobile.shared.FerriesRouteFeed; import gov.wa.wsdot.mobile.shared.FerriesRouteItem; import java.util.ArrayList; import java.util.Date; import java.util.List; public class FerriesRouteSchedulesActivity extends MGWTAbstractActivity implements FerriesRouteSchedulesView.Presenter { private final ClientFactory clientFactory; private FerriesRouteSchedulesView view; private EventBus eventBus; private WSDOTDataService dbService; private PhoneGap phoneGap; private Analytics analytics; private Accessibility accessibility; private static boolean alertShowing = false; private static List<FerriesRouteItem> ferriesRouteItems = new ArrayList<FerriesRouteItem>(); private static List<Integer> starred = new ArrayList<Integer>(); private static DateTimeFormat dateFormat = DateTimeFormat.getFormat("MMMM d, yyyy h:mm a"); private static final String FERRIES_SCHEDULES_URL = Consts.HOST_URL + "/traveler/api/wsfschedule"; public FerriesRouteSchedulesActivity(ClientFactory clientFactory) { this.clientFactory = clientFactory; } @Override public void start(AcceptsOneWidget panel, final EventBus eventBus) { view = clientFactory.getFerriesRouteSchedulesView(); dbService = clientFactory.getDbService(); phoneGap = clientFactory.getPhoneGap(); analytics = clientFactory.getAnalytics(); accessibility = clientFactory.getAccessibility(); this.eventBus = eventBus; view.setPresenter(this); view.getPullHeader().setHTML("pull down"); PullArrowStandardHandler headerHandler = new PullArrowStandardHandler(view.getPullHeader(), view.getPullPanel()); headerHandler.setErrorText("Error"); headerHandler.setLoadingText("Loading"); headerHandler.setNormalText("pull down"); headerHandler.setPulledText("release to load"); headerHandler.setPullActionHandler(new PullActionHandler() { @Override public void onPullAction(final AsyncCallback<Void> callback) { new Timer() { @Override public void run() { createTopicsList(true); view.refresh(); callback.onSuccess(null); } }.schedule(1); } }); view.setHeaderPullHandler(headerHandler); createTopicsList(false); if (Consts.ANALYTICS_ENABLED) { analytics.trackScreen("/Ferries/Schedules"); } panel.setWidget(view); accessibility.postScreenChangeNotification(); } @Override public void onItemSelected(int index) { FerriesRouteItem item = ferriesRouteItems.get(index); if (Consts.ANALYTICS_ENABLED) { analytics.trackEvent("Ferries", "Schedules", item.getDescription()); } clientFactory.getPlaceController().goTo(new FerriesRouteSailingsPlace(Integer.toString(item.getRouteID()))); } private void createTopicsList(final boolean forceUpdate) { /** * Check the cache table for the last time data was downloaded. If we are within * the allowed time period, don't sync, otherwise get fresh data from the server. */ dbService.getCacheLastUpdated(Tables.FERRIES_SCHEDULES, new ListCallback<GenericRow>() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<GenericRow> result) { boolean shouldUpdate = true; if (!result.isEmpty()) { double now = System.currentTimeMillis(); double lastUpdated = result.get(0).getDouble(CachesColumns.CACHE_LAST_UPDATED); shouldUpdate = (Math.abs(now - lastUpdated) > (15 * 60000)); // Refresh every 15 minutes. } view.showProgressIndicator(); if (shouldUpdate || forceUpdate) { /** * Check the ferry schedules table for any starred entries. If we find some, * save them to a list so we can re-star those after we flush the database. */ dbService.getStarredFerriesSchedules(new ListCallback<GenericRow>() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<GenericRow> result) { starred.clear(); if (!result.isEmpty()) { for (GenericRow row : result) { starred.add(row.getInt(FerriesSchedulesColumns.FERRIES_SCHEDULE_ID)); } } JsonpRequestBuilder jsonp = new JsonpRequestBuilder(); // Set timeout for 30 seconds (30000 milliseconds) jsonp.setTimeout(30000); jsonp.requestObject(FERRIES_SCHEDULES_URL, new AsyncCallback<FerriesRouteFeed>() { @Override public void onFailure(Throwable caught) { view.hideProgressIndicator(); if (!alertShowing) { alertShowing = true; phoneGap.getNotification().alert("Can't load data. Check your connection.", new AlertCallback() { @Override public void onOkButtonClicked() { alertShowing = false; } }, "Connection Error"); } } @Override public void onSuccess(FerriesRouteFeed result) { if (result.getRoutes() != null) { ferriesRouteItems.clear(); FerriesRouteItem item; int numRoutes = result.getRoutes().length(); for (int i = 0; i < numRoutes; i++) { item = new FerriesRouteItem(); item.setRouteID(result.getRoutes().get(i).getRouteID()); item.setDescription(result.getRoutes().get(i).getDescription()); item.setCrossingTime(result.getRoutes().get(i).getCrossingTime()); item.setScheduleDate( new JSONArray(result.getRoutes().get(i).getDate()).toString()); item.setRouteAlert( new JSONArray(result.getRoutes().get(i).getRouteAlert()) .toString()); item.setCacheDate(dateFormat.format(new Date(Long.parseLong( result.getRoutes().get(i).getCacheDate().substring(6, 19))))); if (starred.contains(result.getRoutes().get(i).getRouteID())) { item.setIsStarred(1); } ferriesRouteItems.add(item); } // Purge existing border wait times covered by incoming data dbService.deleteFerriesSchedules(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { // Bulk insert all the new ferries schedules dbService.insertFerriesSchedules(ferriesRouteItems, new RowIdListCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<Integer> rowIds) { // Update the cache table with the time we did the update List<CacheItem> cacheItems = new ArrayList<CacheItem>(); cacheItems .add(new CacheItem(Tables.FERRIES_SCHEDULES, System.currentTimeMillis())); dbService.updateCachesTable(cacheItems, new VoidCallback() { @Override public void onFailure( DataServiceException error) { } @Override public void onSuccess() { dbService.getFerriesSchedules( new ListCallback<GenericRow>() { @Override public void onFailure( DataServiceException error) { } @Override public void onSuccess( List<GenericRow> result) { getFerriesSchedules( result); } }); } }); } }); } }); } } }); } }); } else { dbService.getFerriesSchedules(new ListCallback<GenericRow>() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<GenericRow> result) { getFerriesSchedules(result); } }); } } }); } /** * Get the latest ferries route schedules from the database. * * @param result */ private void getFerriesSchedules(List<GenericRow> result) { ferriesRouteItems.clear(); FerriesRouteItem item; int numResults = result.size(); for (int i = 0; i < numResults; i++) { item = new FerriesRouteItem(); item.setRouteID(result.get(i).getInt(FerriesSchedulesColumns.FERRIES_SCHEDULE_ID)); item.setDescription(result.get(i).getString(FerriesSchedulesColumns.FERRIES_SCHEDULE_TITLE)); item.setCrossingTime(result.get(i).getString(FerriesSchedulesColumns.FERRIES_SCHEDULE_CROSSING_TIME)); item.setScheduleDate(result.get(i).getString(FerriesSchedulesColumns.FERRIES_SCHEDULE_DATE)); item.setRouteAlert(result.get(i).getString(FerriesSchedulesColumns.FERRIES_SCHEDULE_ALERT)); item.setCacheDate(result.get(i).getString(FerriesSchedulesColumns.FERRIES_SCHEDULE_UPDATED)); item.setIsStarred(result.get(i).getInt(FerriesSchedulesColumns.FERRIES_SCHEDULE_IS_STARRED)); ferriesRouteItems.add(item); } view.hideProgressIndicator(); view.render(ferriesRouteItems); view.refresh(); accessibility.postScreenChangeNotification(); } @Override public void onStop() { view.setPresenter(null); } @Override public void onBackButtonPressed() { ActionEvent.fire(eventBus, ActionNames.BACK); } }