Cache event types and changed method names

src/ol/object.js

@@ -67,6 +67,24 @@ ol.Object.create = function(arg) {
 };
 
 
+/**
+ * @private
+ * @type {Object.<string, string>}
+ */
+ol.Object.changedEventTypeCache_ = {};
+
+
+/**
+ * @param {string} key Key.
+ * @private
+ * @return {string} Changed name.
+ */
+ol.Object.getChangedEventType_ = function(key) {
+  return ol.Object.changedEventTypeCache_[key] ||
+      (ol.Object.changedEventTypeCache_[key] = key.toLowerCase() + '_changed');
+};
+
+
 /**
  * @private
  * @type {Object.<string, string>}
@@ -85,6 +103,24 @@ ol.Object.getGetterName_ = function(key) {
 };
 
 
+/**
+ * @private
+ * @type {Object.<string, string>}
+ */
+ol.Object.changedMethodNameCache_ = {};
+
+
+/**
+ * @param {string} key String.
+ * @private
+ * @return {string} Changed method name.
+ */
+ol.Object.getChangedMethodName_ = function(key) {
+  return ol.Object.changedMethodNameCache_[key] ||
+      (ol.Object.changedMethodNameCache_[key] = key + '_changed');
+};
+
+
 /**
  * @private
  * @type {Object.<string, string>}
@@ -133,7 +169,7 @@ ol.Object.prototype.bindTo =
     function(key, target, opt_targetKey, opt_noNotify) {
   var targetKey = goog.isDef(opt_targetKey) ? opt_targetKey : key;
   this.unbind(key);
-  var eventType = targetKey.toLowerCase() + '_changed';
+  var eventType = ol.Object.getChangedEventType_(targetKey);
   var listeners = ol.Object.getListeners(this);
   listeners[key] = goog.events.listen(target, eventType, function() {
     this.notifyInternal_(key);
@@ -197,13 +233,13 @@ ol.Object.prototype.notify = function(key) {
  * @private
  */
 ol.Object.prototype.notifyInternal_ = function(key) {
-  var changedMethodName = key + '_changed';
+  var changedMethodName = ol.Object.getChangedMethodName_(key);
   if (this[changedMethodName]) {
     this[changedMethodName]();
   } else {
     this.changed(key);
   }
-  var eventType = key.toLowerCase() + '_changed';
+  var eventType = ol.Object.getChangedEventType_(key);
   this.dispatchEvent(eventType);
 };
 

src/ol/object_test.js

@@ -454,3 +454,29 @@ function testCreateWithOptions() {
   var obj = new ol.Object({k: 1});
   assertEquals(1, obj.get('k'));
 }
+
+
+function testEventTypeCaseSensitivity() {
+  var obj = new ol.Object();
+  var lowercaseChangedMethodCalled = false;
+  obj.k_changed = function() {
+    lowercaseChangedMethodCalled = true;
+  };
+  var uppercaseChangedMethodCalled = false;
+  obj.K_changed = function() {
+    uppercaseChangedMethodCalled = true;
+  };
+  var lowercaseEventDispatched = false;
+  goog.events.listen(obj, 'k_changed', function() {
+    lowercaseEventDispatched = true;
+  });
+  var uppercaseEventDispatched = false;
+  goog.events.listen(obj, 'K_changed', function() {
+    uppercaseEventDispatched = true;
+  });
+  obj.set('K', 1);
+  assertTrue(lowercaseEventDispatched);
+  assertFalse(uppercaseEventDispatched);
+  assertFalse(lowercaseChangedMethodCalled);
+  assertTrue(uppercaseChangedMethodCalled);
+}