Issue 4399 - Add WebView inheritor with ad blocking

libadblockplus-android/src/org/adblockplus/android/Utils.java

Index: libadblockplus-android/src/org/adblockplus/android/Utils.java
diff --git a/libadblockplus-android/src/org/adblockplus/android/Utils.java b/libadblockplus-android/src/org/adblockplus/android/Utils.java
index 47b7c663c5adb7458de98766d84eacf463d4af0e..1554ae90c9948ec56a213b207f77ae9ad8b3da6f 100644
--- a/libadblockplus-android/src/org/adblockplus/android/Utils.java
+++ b/libadblockplus-android/src/org/adblockplus/android/Utils.java
@@ -18,11 +18,17 @@
 package org.adblockplus.android;
 
 import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.List;
 
 import org.adblockplus.libadblockplus.JsValue;
 import org.adblockplus.libadblockplus.Subscription;
 import org.apache.commons.lang.StringUtils;
+import org.json.JSONArray;
 
 import android.app.Notification;
 import android.app.NotificationManager;
@@ -80,4 +86,66 @@ public final class Utils
       // Ignored for now
     }
   }
+
+  public static String stringListToJsonArray(List<String> list)
+  {
+    JSONArray array = new JSONArray();
+
+    if (list != null)
+    {
+      for (String eachString : list)
+      {
+        if (eachString != null)
+        {
+          array.put(eachString);
+        }
+      }
+    }
+
+    return array.toString();
+  }
+
+  /**
+   * Extract domain from URL
+   * @param url valid URL (with scheme)
+   * @return domain
+   * @throws URISyntaxException
+   */
+  public static String getDomain(String url) throws URISyntaxException
+  {
+    URI uri = new URI(url);
+    String domain = uri.getHost();
+    if (domain == null)
+      throw new URISyntaxException(url, "Invalid url");
+    return domain.startsWith("www.") ? domain.substring(4) : domain;
+  }
+
+  public static String readAssetAsString(Context context, String filename) throws IOException
+  {
+    BufferedReader in = null;
+    try {
+      StringBuilder buf = new StringBuilder();
+      InputStream is = context.getAssets().open(filename);
+      in = new BufferedReader(new InputStreamReader(is));
+
+      String str;
+      boolean isFirst = true;
+      while ( (str = in.readLine()) != null ) {
+        if (isFirst)
+          isFirst = false;
+        else
+          buf.append('\n');
+        buf.append(str);
+      }
+      return buf.toString();
+    } finally {
+      if (in != null) {
+        try {
+          in.close();
+        } catch (IOException e) {
+          // ignored
+        }
+      }
+    }
+  }
 }