Java tutorial
/*! * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * 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 Lesser General Public License for more details. * * Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved. */ package org.pentaho.mantle.client.commands; import com.google.gwt.core.client.GWT; import com.google.gwt.http.client.Request; import com.google.gwt.http.client.RequestBuilder; import com.google.gwt.http.client.RequestCallback; import com.google.gwt.http.client.RequestException; import com.google.gwt.http.client.Response; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.Label; import com.google.gwt.xml.client.Document; import com.google.gwt.xml.client.Element; import com.google.gwt.xml.client.NodeList; import com.google.gwt.xml.client.XMLParser; import org.pentaho.gwt.widgets.client.dialogs.MessageDialogBox; import org.pentaho.gwt.widgets.client.dialogs.PromptDialogBox; import org.pentaho.mantle.client.messages.Messages; public class CheckForSoftwareUpdatesCommand extends AbstractCommand { public CheckForSoftwareUpdatesCommand() { } protected void performOperation() { performOperation(true); } protected void performOperation(boolean feedback) { final String url = GWT.getHostPageBaseURL() + "api/version/softwareUpdates"; //$NON-NLS-1$ RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url); requestBuilder.setHeader("If-Modified-Since", "01 Jan 1970 00:00:00 GMT"); requestBuilder.setHeader("accept", "text/plain"); try { requestBuilder.sendRequest(null, new RequestCallback() { public void onError(Request request, Throwable exception) { MessageDialogBox dialogBox = new MessageDialogBox(Messages.getString("softwareUpdates"), //$NON-NLS-1$ Messages.getString("noUpdatesAvailable"), false, false, true); //$NON-NLS-1$ dialogBox.center(); } public void onResponseReceived(Request request, Response response) { Document doc = XMLParser.parse(response.getText()); NodeList updates = doc.getElementsByTagName("update"); //$NON-NLS-1$ if (updates.getLength() > 0) { FlexTable updateTable = new FlexTable(); updateTable.setStyleName("backgroundContentTable"); //$NON-NLS-1$ updateTable.setWidget(0, 0, new Label(Messages.getString("version"))); //$NON-NLS-1$ updateTable.setWidget(0, 1, new Label(Messages.getString("type"))); //$NON-NLS-1$ updateTable.setWidget(0, 2, new Label(Messages.getString("os"))); //$NON-NLS-1$ updateTable.setWidget(0, 3, new Label(Messages.getString("link"))); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(0, 0, "backgroundContentHeaderTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(0, 1, "backgroundContentHeaderTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(0, 2, "backgroundContentHeaderTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(0, 3, "backgroundContentHeaderTableCellRight"); //$NON-NLS-1$ for (int i = 0; i < updates.getLength(); i++) { Element updateElement = (Element) updates.item(i); String version = updateElement.getAttribute("version"); //$NON-NLS-1$ String type = updateElement.getAttribute("type"); //$NON-NLS-1$ String os = updateElement.getAttribute("os"); //$NON-NLS-1$ // String title = updateElement.getAttribute("title"); String downloadURL = updateElement.getElementsByTagName("downloadurl").item(0) //$NON-NLS-1$ .toString(); downloadURL = downloadURL.substring(downloadURL.indexOf("http"), //$NON-NLS-1$ downloadURL.indexOf("]")); //$NON-NLS-1$ updateTable.setWidget(i + 1, 0, new Label(version)); updateTable.setWidget(i + 1, 1, new Label(type)); updateTable.setWidget(i + 1, 2, new Label(os)); updateTable.setWidget(i + 1, 3, new HTML("<A HREF=\"" + downloadURL + "\" target=\"_blank\" title=\"" + downloadURL + "\">" + Messages.getString("download") + "</A>")); //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ updateTable.getCellFormatter().setStyleName(i + 1, 0, "backgroundContentTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 1, "backgroundContentTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 2, "backgroundContentTableCell"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 3, "backgroundContentTableCellRight"); //$NON-NLS-1$ if (i == updates.getLength() - 1) { // last updateTable.getCellFormatter().setStyleName(i + 1, 0, "backgroundContentTableCellBottom"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 1, "backgroundContentTableCellBottom"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 2, "backgroundContentTableCellBottom"); //$NON-NLS-1$ updateTable.getCellFormatter().setStyleName(i + 1, 3, "backgroundContentTableCellBottomRight"); //$NON-NLS-1$ } } PromptDialogBox versionPromptDialog = new PromptDialogBox( Messages.getString("softwareUpdateAvailable"), Messages.getString("ok"), null, //$NON-NLS-1$//$NON-NLS-2$ false, true, updateTable); versionPromptDialog.center(); } else { MessageDialogBox dialogBox = new MessageDialogBox(Messages.getString("softwareUpdates"), //$NON-NLS-1$ Messages.getString("noUpdatesAvailable"), false, false, true); //$NON-NLS-1$ dialogBox.center(); } } }); } catch (RequestException e) { Window.alert(e.getMessage()); // showError(e); } } }