Added DefaultImage enum to GravatarUtils

WordPressUtils/src/main/java/org/wordpress/android/util/GravatarUtils.java

@@ -1,22 +1,55 @@
 package org.wordpress.android.util;
 
 public class GravatarUtils {
+
     /*
      * see https://en.gravatar.com/site/implement/images/
      */
+
+    public static enum DefaultImage {
+        MYSTERY_MAN,
+        STATUS_404,
+        IDENTICON,
+        MONSTER,
+        WAVATAR,
+        RETRO,
+        BLANK;
+
+        @Override
+        public String toString() {
+            switch (this) {
+                case MYSTERY_MAN:
+                    return "mm";
+                case STATUS_404:
+                    return "404";
+                case IDENTICON:
+                    return "identicon";
+                case MONSTER:
+                    return "monsterid";
+                case WAVATAR:
+                    return "wavatar";
+                case RETRO:
+                    return "retro";
+                default:
+                    return "blank";
+            }
+        }
+    }
+
     public static String gravatarFromEmail(final String email, int size) {
+        return gravatarFromEmail(email, size, DefaultImage.MYSTERY_MAN);
+    }
+    public static String gravatarFromEmail(final String email, int size, DefaultImage defaultImage) {
         return "http://gravatar.com/avatar/"
               + StringUtils.getMd5Hash(StringUtils.notNullStr(email))
-              + "?d=mm&size=" + Integer.toString(size);
+              + "?d=" + defaultImage.toString()
+              + "&size=" + Integer.toString(size);
     }
 
-    /*
-     * important: the 404 default means the request will 404 if there is no blavatar
-     * for the passed site - so the caller needs to trap the 404 to provide a default
-     */
-    public static String blavatarFromUrl(final String url, int size) {
+    public static String blavatarFromUrl(final String url, int size, DefaultImage defaultImage) {
         return "http://gravatar.com/blavatar/"
                 + StringUtils.getMd5Hash(UrlUtils.getDomainFromUrl(url))
-                + "?d=404&size=" + Integer.toString(size);
+                + "?d=" + defaultImage.toString()
+                + "&size=" + Integer.toString(size);
     }
 }