Java tutorial
/* * Copyright 2008 Google 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.google.gwt.gdata.sample.hellogdata.client; import com.google.gwt.accounts.client.AuthSubStatus; import com.google.gwt.accounts.client.User; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.gdata.client.GData; import com.google.gwt.gdata.client.GDataSystemPackage; import com.google.gwt.gdata.client.atom.Text; import com.google.gwt.gdata.client.finance.FinanceService; import com.google.gwt.gdata.client.finance.PortfolioData; import com.google.gwt.gdata.client.finance.PortfolioEntry; import com.google.gwt.gdata.client.finance.PortfolioEntryCallback; import com.google.gwt.gdata.client.impl.CallErrorException; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.Label; /** * The following example demonstrates how to create a portfolio. */ public class FinanceCreatePortfolioDemo extends GDataDemo { /** * This method is used by the main sample app to obtain * information on this sample and a sample instance. * * @return An instance of this demo. */ public static GDataDemoInfo init() { return new GDataDemoInfo() { @Override public GDataDemo createInstance() { return new FinanceCreatePortfolioDemo(); } @Override public String getDescription() { return "<p>This sample demonstrates how to create and insert " + "a new portfolio. The portfolio feed post URL " + "(http://finance.google.com/finance/feeds/default/portfolios) " + "is used to insert a new portfolio entry for the authenticated " + "user.</p>"; } @Override public String getName() { return "Finance - Creating a portfolio"; } }; } private FinanceService service; private FlexTable mainPanel; private final String scope = "http://finance.google.com/finance/feeds/"; /** * Setup the Finance service and create the main content panel. * If the user is not logged on to Finance display a message, * otherwise start the demo by creating a portfolio. */ private FinanceCreatePortfolioDemo() { mainPanel = new FlexTable(); initWidget(mainPanel); if (!GData.isLoaded(GDataSystemPackage.FINANCE)) { showStatus("Loading the GData Finance package...", false); GData.loadGDataApi(GDATA_API_KEY, new Runnable() { public void run() { startDemo(); } }, GDataSystemPackage.FINANCE); } else { startDemo(); } } /** * Create a portfolio by inserting a portfolio entry into * a portfolio feed. * Set the portfolio's title to an arbitrary string. Here * we prefix the title with 'GWT-Finance-Client' so that * we can identify which portfolios were created by this demo. * The new portfolio is created with currency code set to USD. * On success and failure, display a status message. * * @param portfolioFeedUri The uri of the portfolio feed into which * to insert the portfolio entry */ private void createPortfolio(String portfolioFeedUri) { showStatus("Creating portfolio...", false); PortfolioEntry entry = PortfolioEntry.newInstance(); entry.setTitle(Text.newInstance()); entry.getTitle().setText("GWT-Finance-Client - inserted portfolio"); PortfolioData data = PortfolioData.newInstance(); data.setCurrencyCode("USD"); entry.setPortfolioData(data); service.insertEntry(portfolioFeedUri, entry, new PortfolioEntryCallback() { public void onFailure(CallErrorException caught) { showStatus("An error occurred while creating a portfolio: " + caught.getMessage(), true); } public void onSuccess(PortfolioEntry result) { showStatus("Created a portfolio.", false); } }); } /** * Displays a status message to the user. * * @param message The message to display. * @param isError Indicates whether the status is an error status. */ private void showStatus(String message, boolean isError) { mainPanel.clear(); mainPanel.insertRow(0); mainPanel.addCell(0); Label msg = new Label(message); if (isError) { msg.setStylePrimaryName("hm-error"); } mainPanel.setWidget(0, 0, msg); } /** * Starts this demo. */ private void startDemo() { service = FinanceService.newInstance("HelloGData_Finance_CreatePortfolioDemo_v2.0"); if (User.getStatus(scope) == AuthSubStatus.LOGGED_IN) { Button startButton = new Button("Create a portfolio"); startButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { createPortfolio("http://finance.google.com/finance/feeds/default/portfolios"); } }); mainPanel.setWidget(0, 0, startButton); } else { showStatus("You are not logged on to Google Finance.", true); } } }