Java tutorial
/* * Copyright (C) 2011 4th Line GmbH, Switzerland * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.fourthline.konto.client.currency; import com.google.gwt.activity.shared.AbstractActivity; import com.google.web.bindery.event.shared.EventBus; import com.google.gwt.place.shared.PlaceController; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.AcceptsOneWidget; import org.fourthline.konto.client.currency.event.CurrencyPairModified; import org.fourthline.konto.client.currency.event.MonetaryUnitModified; import org.fourthline.konto.client.currency.view.CurrencyView; import org.fourthline.konto.client.ledger.event.AccountSelectionModeChange; import org.seamless.gwt.notify.client.Message; import org.seamless.gwt.notify.client.ServerFailureNotifyEvent; import org.seamless.gwt.notify.client.NotifyEvent; import org.fourthline.konto.client.service.CurrencyServiceAsync; import org.fourthline.konto.client.settings.GlobalSettings; import org.fourthline.konto.client.settings.event.GlobalSettingsRefreshedEvent; import org.fourthline.konto.shared.entity.CurrencyPair; import org.fourthline.konto.shared.entity.MonetaryUnit; import org.fourthline.konto.shared.entity.settings.GlobalOption; import javax.inject.Inject; import java.util.ArrayList; import java.util.List; import java.util.logging.Level; /** * @author Christian Bauer */ public class CurrencyActivity extends AbstractActivity implements CurrencyView.Presenter, GlobalSettingsRefreshedEvent.Handler, MonetaryUnitModified.Handler, CurrencyPairModified.Handler { class InitMonetaryUnitsCallback implements AsyncCallback<List<MonetaryUnit>> { protected Long editMonetaryUnitId; InitMonetaryUnitsCallback(Long editMonetaryUnitId) { this.editMonetaryUnitId = editMonetaryUnitId; } @Override public void onFailure(Throwable caught) { bus.fireEvent(new ServerFailureNotifyEvent(caught)); } @Override public void onSuccess(List<MonetaryUnit> result) { monetaryUnits = result; view.reset(); view.setMonetaryUnits(result); boolean edit = false; if (editMonetaryUnitId != null) { for (MonetaryUnit monetaryUnit : result) { if (monetaryUnit.getId().equals(editMonetaryUnitId)) { monetaryUnitSelected(monetaryUnit); edit = true; break; } } } if (!edit) { unitPresenter.startWith(null); } } } final CurrencyView view; final PlaceController placeController; final EventBus bus; final CurrencyServiceAsync service; final MonetaryUnitPresenter unitPresenter; final CurrencyPairPresenter currencyPairPresenter; Long monetaryUnitId; List<MonetaryUnit> monetaryUnits; MonetaryUnit selectedUnit; List<MonetaryUnit> exchangeUnits; MonetaryUnit exchangeUnit; List<CurrencyPair> currencyPairs; @Inject public CurrencyActivity(CurrencyView view, MonetaryUnitPresenter unitPresenter, CurrencyPairPresenter currencyPairPresenter, PlaceController placeController, EventBus bus, CurrencyServiceAsync service, GlobalSettings globalSettings) { this.view = view; this.unitPresenter = unitPresenter; this.currencyPairPresenter = currencyPairPresenter; this.placeController = placeController; this.bus = bus; this.service = service; onSettingsRefreshed(globalSettings); } public CurrencyActivity init(CurrencyPlace place) { this.monetaryUnitId = place.getMonetaryUnitId(); return this; } @Override public void start(AcceptsOneWidget containerWidget, com.google.gwt.event.shared.EventBus activityBus) { view.setPresenter(this); containerWidget.setWidget(view.asWidget()); activityBus.addHandler(GlobalSettingsRefreshedEvent.TYPE, this); activityBus.addHandler(MonetaryUnitModified.TYPE, this); activityBus.addHandler(CurrencyPairModified.TYPE, this); bus.fireEvent(new AccountSelectionModeChange()); service.getMonetaryUnits(new InitMonetaryUnitsCallback(monetaryUnitId)); } @Override public void onSettingsRefreshed(GlobalSettings gs) { view.setDateFormat(gs.getValue(GlobalOption.OPT_DATE_FORMAT)); currencyPairPresenter.onSettingsRefreshed(gs); } @Override public void monetaryUnitSelected(MonetaryUnit selected) { this.selectedUnit = selected; unitPresenter.startWith(selectedUnit); refreshExchangeUnits(); refreshCurrencyPairs(); } @Override public void exchangeMonetaryUnitSelected(int index) { exchangeUnit = exchangeUnits.get(index); refreshCurrencyPairs(); } @Override public void currencyPairSelected(CurrencyPair pair) { currencyPairPresenter.startWith(selectedUnit, exchangeUnit, pair); } @Override public void onMonetaryUnitModified(MonetaryUnitModified event) { service.getMonetaryUnits( new InitMonetaryUnitsCallback(event.getUnit() != null ? event.getUnit().getId() : null)); } @Override public void onCurrencyPairModified(CurrencyPairModified event) { refreshCurrencyPairs(); } @Override public void downloadAll() { showDownloadBusyMessage(); service.download(null, new AsyncCallback<String>() { @Override public void onFailure(Throwable caught) { bus.fireEvent(new ServerFailureNotifyEvent(caught)); } @Override public void onSuccess(String result) { if (result == null) { showDownloadCompleteMessage(); } else { showDownloadFailedMessage(result); } refreshCurrencyPairs(); } }); } @Override public void download() { CurrencyPair selectedPair = getSelectedPair(); if (selectedPair == null) return; showDownloadBusyMessage(); service.download(selectedPair, new AsyncCallback<String>() { @Override public void onFailure(Throwable caught) { bus.fireEvent(new ServerFailureNotifyEvent(caught)); } @Override public void onSuccess(String result) { if (result == null) { showDownloadCompleteMessage(); } else { showDownloadFailedMessage(result); } refreshCurrencyPairs(); } }); } @Override public void removeAll() { CurrencyPair selectedPair = getSelectedPair(); if (selectedPair == null) return; service.removeAll(selectedPair, new AsyncCallback<Void>() { @Override public void onFailure(Throwable caught) { bus.fireEvent(new ServerFailureNotifyEvent(caught)); } @Override public void onSuccess(Void result) { bus.fireEvent(new NotifyEvent(new Message(Level.INFO, "Exchange rates deleted", "All exchange rates have been permanently removed."))); refreshCurrencyPairs(); } }); } protected CurrencyPair getSelectedPair() { if (selectedUnit == null || exchangeUnit == null) return null; return new CurrencyPair(selectedUnit, exchangeUnit); } protected void refreshExchangeUnits() { List<MonetaryUnit> list = new ArrayList(); for (MonetaryUnit monetaryUnit : monetaryUnits) { if (!monetaryUnit.equals(selectedUnit)) { list.add(monetaryUnit); } } exchangeUnits = list; // Take the first one, we assume this is what thew view shows as "selected" exchangeUnit = exchangeUnits.size() > 0 ? exchangeUnits.get(0) : null; view.setExchangeMonetaryUnits(selectedUnit, exchangeUnits); } protected void refreshCurrencyPairs() { if (selectedUnit == null || exchangeUnit == null) return; currencyPairPresenter.startWith(selectedUnit, exchangeUnit, null); service.getCurrencyPairs(selectedUnit, exchangeUnit, new AsyncCallback<List<CurrencyPair>>() { @Override public void onFailure(Throwable caught) { bus.fireEvent(new ServerFailureNotifyEvent(caught)); } @Override public void onSuccess(List<CurrencyPair> result) { currencyPairs = result; view.setCurrencyPairs(selectedUnit, result); } }); } protected void showDownloadBusyMessage() { bus.fireEvent(new NotifyEvent(new Message(true, Level.INFO, "Downloading exchange rates", "Please wait until download is complete..."))); } protected void showDownloadFailedMessage(String msg) { bus.fireEvent(new NotifyEvent(new Message(Level.WARNING, "Downloading exchange rates failed", msg))); } protected void showDownloadCompleteMessage() { bus.fireEvent(new NotifyEvent( new Message(Level.INFO, "Download complete", "Exchange rates have been downloaded."))); } }