Converted remoting.Error from an enum to a class

remoting/webapp/crd/js/error.js

Index: remoting/webapp/crd/js/error.js
diff --git a/remoting/webapp/crd/js/error.js b/remoting/webapp/crd/js/error.js
index c1da1dc6298be5a583a5dbca3892196e5b342a08..4686d4ecfbdab3fad3ae79170f118c607bbe8cba 100644
--- a/remoting/webapp/crd/js/error.js
+++ b/remoting/webapp/crd/js/error.js
@@ -25,11 +25,38 @@ remoting.Error = function(tag, opt_message) {
 };
 
 /**
+ * Checks the type of an error.  This method is more typesafe than
+ * using ==.
+ * @param {remoting.Error.Tag} tag
+ * @return {boolean} True if this object has the specified tag.
+ */
+remoting.Error.prototype.hasTag = function(tag) {
+  return this.tag == tag;
+};
+
+
+/**
  * @return {boolean} True if this object represents an error
  *     condition.
  */
 remoting.Error.prototype.isError = function() {
-  return this.tag != remoting.Error.Tag.NONE;
+  return !this.hasTag(remoting.Error.Tag.NONE);
+};
+
+/**
+ * Convenience method for creating the second most common error type.
+ * @return {!remoting.Error}
+ */
+remoting.Error.none = function() {
+  return new remoting.Error(remoting.Error.Tag.NONE);
+};
+
+/**
+ * Convenience method for creating the most common error type.
+ * @return {!remoting.Error}
+ */
+remoting.Error.unexpected = function() {
+  return new remoting.Error(remoting.Error.Tag.UNEXPECTED);
 };
 
 /**
@@ -70,81 +97,6 @@ remoting.Error.Tag = {
 // Please don't add any more constants here; just call the
 // remoting.Error constructor directly
 
-/** @const */
-remoting.Error.NONE = new remoting.Error(remoting.Error.Tag.NONE);
-
-/** @const */
-remoting.Error.CANCELLED =
-  new remoting.Error(remoting.Error.Tag.CANCELLED);
-
-/** @const */
-remoting.Error.INVALID_ACCESS_CODE =
-  new remoting.Error(remoting.Error.Tag.INVALID_ACCESS_CODE);
-
-/** @const */
-remoting.Error.MISSING_PLUGIN =
-  new remoting.Error(remoting.Error.Tag.MISSING_PLUGIN);
-
-/** @const */
-remoting.Error.AUTHENTICATION_FAILED =
-  new remoting.Error(remoting.Error.Tag.AUTHENTICATION_FAILED);
-
-/** @const */
-remoting.Error.HOST_IS_OFFLINE =
-  new remoting.Error(remoting.Error.Tag.HOST_IS_OFFLINE);
-
-/** @const */
-remoting.Error.INCOMPATIBLE_PROTOCOL =
-  new remoting.Error(remoting.Error.Tag.INCOMPATIBLE_PROTOCOL);
-
-/** @const */
-remoting.Error.BAD_PLUGIN_VERSION =
-  new remoting.Error(remoting.Error.Tag.BAD_PLUGIN_VERSION);
-
-/** @const */
-remoting.Error.NETWORK_FAILURE =
-  new remoting.Error(remoting.Error.Tag.NETWORK_FAILURE);
-
-/** @const */
-remoting.Error.HOST_OVERLOAD =
-  new remoting.Error(remoting.Error.Tag.HOST_OVERLOAD);
-
-/** @const */
-remoting.Error.UNEXPECTED =
-  new remoting.Error(remoting.Error.Tag.UNEXPECTED);
-
-/** @const */
-remoting.Error.SERVICE_UNAVAILABLE =
-  new remoting.Error(remoting.Error.Tag.SERVICE_UNAVAILABLE);
-
-/** @const */
-remoting.Error.NOT_AUTHENTICATED =
-  new remoting.Error(remoting.Error.Tag.NOT_AUTHENTICATED);
-
-/** @const */
-remoting.Error.NOT_FOUND =
-  new remoting.Error(remoting.Error.Tag.NOT_FOUND);
-
-/** @const */
-remoting.Error.INVALID_HOST_DOMAIN =
-  new remoting.Error(remoting.Error.Tag.INVALID_HOST_DOMAIN);
-
-/** @const */
-remoting.Error.P2P_FAILURE =
-  new remoting.Error(remoting.Error.Tag.P2P_FAILURE);
-
-/** @const */
-remoting.Error.REGISTRATION_FAILED =
-  new remoting.Error(remoting.Error.Tag.REGISTRATION_FAILED);
-
-/** @const */
-remoting.Error.NOT_AUTHORIZED =
-  new remoting.Error(remoting.Error.Tag.NOT_AUTHORIZED);
-
-/** @const */
-remoting.Error.APP_NOT_AUTHORIZED =
-  new remoting.Error(remoting.Error.Tag.APP_NOT_AUTHORIZED);
-
 /**
  * @param {number} httpStatus An HTTP status code.
  * @return {!remoting.Error} The remoting.Error enum corresponding to the
@@ -152,20 +104,20 @@ remoting.Error.APP_NOT_AUTHORIZED =
  */
 remoting.Error.fromHttpStatus = function(httpStatus) {
   if (httpStatus == 0) {
-    return remoting.Error.NETWORK_FAILURE;
+    return new remoting.Error(remoting.Error.Tag.NETWORK_FAILURE);
   } else if (httpStatus >= 200 && httpStatus < 300) {
-    return remoting.Error.NONE;
+    return remoting.Error.none();
   } else if (httpStatus == 400 || httpStatus == 401) {
-    return remoting.Error.AUTHENTICATION_FAILED;
+    return new remoting.Error(remoting.Error.Tag.AUTHENTICATION_FAILED);
   } else if (httpStatus == 403) {
-    return remoting.Error.NOT_AUTHORIZED;
+    return new remoting.Error(remoting.Error.Tag.NOT_AUTHORIZED);
   } else if (httpStatus == 404) {
-    return remoting.Error.NOT_FOUND;
+    return new remoting.Error(remoting.Error.Tag.NOT_FOUND);
   } else if (httpStatus >= 500 && httpStatus < 600) {
-    return remoting.Error.SERVICE_UNAVAILABLE;
+    return new remoting.Error(remoting.Error.Tag.SERVICE_UNAVAILABLE);
   } else {
     console.warn('Unexpected HTTP error code: ' + httpStatus);
-    return remoting.Error.UNEXPECTED;
+    return remoting.Error.unexpected();
   }
 };
 
@@ -182,7 +134,7 @@ remoting.Error.handler = function(onError) {
       onError(/** @type {!remoting.Error} */ (error));
     } else {
       console.error('Unexpected error: %o', error);
-      onError(remoting.Error.UNEXPECTED);
+      onError(remoting.Error.unexpected());
     }
   };
 };