Bug 730626 - Implement resetting. r=nalexander, a=blocking-fennec

mobile/android/base/sync/ExtendedJSONObject.java

@@ -131,6 +131,30 @@ public class ExtendedJSONObject {
     return (String) this.get(key);
   }
 
+  /**
+   * Return an Integer if the value for this key is an Integer, Long, or String
+   * that can be parsed as a base 10 Integer.
+   * Passes through null.
+   *
+   * @throws NumberFormatException
+   */
+  public Integer getIntegerSafely(String key) throws NumberFormatException {
+    Object val = this.object.get(key);
+    if (val == null) {
+      return null;
+    }
+    if (val instanceof Integer) {
+      return (Integer) val;
+    }
+    if (val instanceof Long) {
+      return new Integer(((Long) val).intValue());
+    }
+    if (val instanceof String) {
+      return Integer.parseInt((String) val, 10);
+    }
+    throw new NumberFormatException("Expecting Integer, got " + val.getClass());
+  }
+
   /**
    * Return a server timestamp value as milliseconds since epoch.
    * @param key