Implement hashCode for ol.style.Circle

src/ol/style/fillstyle.js

@@ -1,5 +1,9 @@
 goog.provide('ol.style.Fill');
 
+goog.require('goog.string');
+goog.require('ol.color');
+goog.require('ol.structs.IHashable');
+
 
 
 /**
@@ -8,6 +12,7 @@ goog.provide('ol.style.Fill');
  *
  * @constructor
  * @param {olx.style.FillOptions=} opt_options Options.
+ * @implements {ol.structs.IHashable}
  * @api
  */
 ol.style.Fill = function(opt_options) {
@@ -40,3 +45,16 @@ ol.style.Fill.prototype.getColor = function() {
 ol.style.Fill.prototype.setColor = function(color) {
   this.color_ = color;
 };
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Fill.prototype.hashCode = function() {
+  var hash = 17;
+
+  hash = hash * 23 + (!goog.isNull(this.color_) ?
+      goog.string.hashCode(ol.color.asString(this.color_)) : 0);
+
+  return hash;
+};