1 files changed, 85 insertions, 0 deletions
diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/UpdateCheckManager.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/UpdateCheckManager.java
new file mode 100644
index 00000000..d6e650ba
--- /dev/null
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/UpdateCheckManager.java
@@ -0,0 +1,85 @@
+package at.asit.pdfover.gui.utils;
+
+import java.awt.Desktop;
+import java.net.URI;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.asit.pdfover.commons.Constants;
+import at.asit.pdfover.commons.Messages;
+import at.asit.pdfover.gui.bku.BKUHelper;
+import at.asit.pdfover.gui.controls.Dialog;
+import at.asit.pdfover.gui.controls.Dialog.BUTTONS;
+import at.asit.pdfover.gui.controls.Dialog.ICON;
+
+import org.apache.commons.httpclient.HttpClient;
+import org.apache.commons.httpclient.methods.GetMethod;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.program.Program;
+import org.eclipse.swt.widgets.Shell;
+
+public final class UpdateCheckManager {
+    static final Logger log = LoggerFactory.getLogger(UpdateCheckManager.class);
+    private static Thread updateCheckThread = null;
+    private static boolean needsCheck = false;
+
+    public static void checkNow(Shell shell) {
+        if (Constants.APP_VERSION == null)
+            return;
+
+        synchronized (UpdateCheckManager.class) {
+            if (updateCheckThread != null)
+                return;
+
+            needsCheck = true;
+            updateCheckThread = new Thread(() -> {
+                while (true) {
+                    synchronized (UpdateCheckManager.class) {
+                        if (!needsCheck) {
+                            UpdateCheckManager.updateCheckThread = null;
+                            return;
+                        }
+                        needsCheck = false;
+                    }
+                    HttpClient client = (HttpClient) BKUHelper.getHttpClient();
+                    GetMethod method = new GetMethod(Constants.CURRENT_RELEASE_URL);
+                    try {
+                        client.executeMethod(method);
+                        final String version = method.getResponseBodyAsString().trim();
+                        if (!VersionComparator.before(Constants.APP_VERSION, version))
+                            return;
+
+                        // wait 500ms before invoke the GUI message, because GUI had to be started from
+                        // main thread
+                        try { Thread.sleep(500); } catch (InterruptedException e1) { }
+                        // invoke GUI message in main thread
+                        shell.getDisplay().asyncExec(() -> {
+                            Dialog info = new Dialog(shell,
+                                    Messages.getString("version_check.UpdateTitle"),
+                                    String.format(Messages.getString("version_check.UpdateText"), version),
+                                    BUTTONS.OK_CANCEL, ICON.INFORMATION);
+
+                            if (info.open() == SWT.OK)
+                            {
+                                if (Desktop.isDesktopSupported()) {
+                                    try {
+                                        Desktop.getDesktop().browse(new URI(Constants.UPDATE_URL));
+                                    } catch (Exception e) {
+                                        log.error("Error opening update location ", e);
+                                    }
+                                } else {
+                                    log.info("SWT Desktop is not supported on this platform");
+                                    Program.launch(Constants.UPDATE_URL);
+                                }
+                            }
+                        });
+                    } catch (Exception e) {
+                        log.error("Error downloading update information: ", e);
+                    }
+                }
+            });
+            updateCheckThread.start();
+        }
+    }
+}