Added an Update Checker, closes #559

src/main/java/com/gmail/nossr50/util/UpdateCheck.java

@@ -0,0 +1,62 @@
+package com.gmail.nossr50.util;
+
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.net.UnknownHostException;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import com.gmail.nossr50.mcMMO;
+import com.gmail.nossr50.config.Config;
+
+public class UpdateCheck {
+    private UpdateCheck() {}
+
+    public static boolean updateAvailable() throws Exception {
+        String checkType = "release";
+        if (Config.getInstance().getPreferBeta()) {
+            checkType = "latest";
+        }
+        String version = mcMMO.p.getDescription().getVersion();
+        URL url = new URL("http://api.bukget.org/api2/bukkit/plugin/mcmmo/"+checkType);
+        InputStreamReader isr;
+        try {
+            isr = new InputStreamReader(url.openStream());
+        } catch (UnknownHostException e) {
+            return false;
+        }
+
+        String newVersion;
+        try {
+            JSONParser jp = new JSONParser();
+            Object o = jp.parse(isr);
+
+            if (!(o instanceof JSONObject)) {
+                isr.close();
+                return false;
+            }
+
+            JSONObject jo = (JSONObject) o;
+            jo = (JSONObject) jo.get("versions");
+            newVersion = (String) jo.get("version");
+
+            String[] oldTokens = version.replaceAll("(?i)(-)(.+?)(-)", "").split("[.]|[b]");
+            String[] newTokens = newVersion.replaceAll("(?i)(-)(.+?)(-)", "").split("[.]|[b]");
+
+            for (int i = 0; i < 4; i++) {
+                Integer newVer = Integer.parseInt(newTokens[i]);
+                Integer oldVer = Integer.parseInt(oldTokens[i]);
+                if (oldVer < newVer) {
+                    isr.close();
+                    return true;
+                }
+            }
+            return false;
+        } catch (ParseException e) {
+            isr.close();
+            return false;
+        }
+    }
+}