UpdateChecker class, runs on a seperate thread and every 30 minutes it

checks for an update for the plugin.

src/com/onarandombox/utils/UpdateChecker.java

@@ -0,0 +1,98 @@
+package com.onarandombox.utils;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+
+public class UpdateChecker {
+
+    public static final Logger log = Logger.getLogger("Minecraft");
+    
+    public Timer timer = new Timer(); // Create a new Timer.
+    
+    private String name; // Hold the Plugins Name.
+    private String cversion; // Hold the Plugins Current Version.
+    
+    
+    public UpdateChecker(String name, String version) {
+        this.name = name;
+        this.cversion = version;
+        
+        int delay = 0; // No Delay, fire the first check instantly.
+        int period = 1800; // Delay 30 Minutes
+
+        timer.scheduleAtFixedRate(new TimerTask() {
+            @Override
+            public void run() {
+                checkUpdate();
+            }
+        }, delay * 1000, period * 1000);
+    }
+
+    public void checkUpdate() {
+        try {
+            URL url = new URL("http://bukkit.onarandombox.com/multiverse/version.php?n=" + URLEncoder.encode(name, "UTF-8") + "&v=" + cversion);
+            URLConnection conn = url.openConnection();
+            conn.setReadTimeout(2000); // 2000 = 2 Seconds.
+            
+            int code = ((HttpURLConnection) conn).getResponseCode();
+            
+            if(code!=200){
+                return;
+            }
+            
+            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
+            String line;
+            String version = null;
+            
+            while ((line = rd.readLine()) != null) {
+                if (version == null) {
+                    version = line;
+                }
+            }
+            
+            if(version==null){
+                rd.close();
+                return;
+            }
+            
+            String v1 = normalisedVersion(version);
+            String v2 = normalisedVersion(cversion);
+
+            int compare = v1.compareTo(v2);
+
+            if(compare > 0){
+                    log.info("[" + name + "]" + " - Update Available (" + version + ")");
+            }
+            
+            rd.close();
+        } catch (Exception e) {
+            // No need to alert the user of any error here... it's not important.
+        }
+    }
+
+    /**
+     * Convert the given Version String to a Normalised Version String so we can compare it.
+     * @param version
+     * @return
+     */
+    public static String normalisedVersion(String version) {
+        return normalisedVersion(version, ".", 4);
+    }
+    public static String normalisedVersion(String version, String sep, int maxWidth) {
+        String[] split = Pattern.compile(sep, Pattern.LITERAL).split(version);
+        StringBuilder sb = new StringBuilder();
+        for (String s : split) {
+            sb.append(String.format("%" + maxWidth + 's', s));
+        }
+        return sb.toString();
+    }
+
+}