Proxy configurators

src/org/adblockplus/android/Utils.java

Index: src/org/adblockplus/android/Utils.java
diff --git a/src/org/adblockplus/android/Utils.java b/src/org/adblockplus/android/Utils.java
index 2a79ffdb476bac3e6482bee0715deab3cdcf8758..63a6fdb31683bf62a64ea793ae449687998db980 100644
--- a/src/org/adblockplus/android/Utils.java
+++ b/src/org/adblockplus/android/Utils.java
@@ -17,6 +17,9 @@
 
 package org.adblockplus.android;
 
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.adblockplus.android.configurators.NativeProxyConfigurator;
 import org.adblockplus.android.updater.UpdaterActivity;
 import org.adblockplus.libadblockplus.JsValue;
 import org.adblockplus.libadblockplus.Subscription;
@@ -30,11 +33,34 @@ import android.support.v4.app.NotificationCompat;
 
 public final class Utils
 {
+  private static final ReentrantLock LOCK = new ReentrantLock();
+  private static boolean nativeProxySupportChecked = false;
+  private static boolean nativeProxySupported = false;
+
   private Utils()
   {
     //
   }
 
+  public static boolean isNativeProxySupported(final Context context)
+  {
+    LOCK.lock();
+    try
+    {
+      if (!nativeProxySupportChecked)
+      {
+        nativeProxySupported = NativeProxyConfigurator.canUse(context);
+        nativeProxySupportChecked = true;
+      }
+
+      return nativeProxySupported;
+    }
+    finally
+    {
+      LOCK.unlock();
+    }
+  }
+
   public static String getTag(final Class<?> clazz)
   {
     return clazz.getSimpleName();