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-// Copyright 2012 The Closure Library Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-/**
- * @fileoverview Experimental observer-observable API. This is
- * intended as super lightweight replacement of
- * goog.events.EventTarget when w3c event model bubble/capture
- * behavior is not required.
- *
- * This is similar to {@code goog.pubsub.PubSub} but with different
- * intent and naming so that it is more discoverable. The API is
- * tighter while allowing for more flexibility offered by the
- * interface {@code Observable}.
- *
- * WARNING: This is still highly experimental. Please contact author
- * before using this.
- *
- */
-
-goog.provide('goog.labs.observe.Observable');
-
-goog.require('goog.disposable.IDisposable');
-
-
-
-/**
- * Interface for an observable object.
- * @interface
- * @extends {goog.disposable.IDisposable}
- */
-goog.labs.observe.Observable = function() {};
-
-
-/**
- * Registers an observer on the observable.
- *
- * Note that no guarantee is provided on order of execution of the
- * observers. For a single notification, one Notice object is reused
- * across all invoked observers.
- *
- * Note that if an observation with the same observer is already
- * registered, it will not be registered again. Comparison is done via
- * observer's {@code equals} method.
- *
- * @param {!goog.labs.observe.Observer} observer The observer to add.
- * @return {boolean} Whether the observer was successfully added.
- */
-goog.labs.observe.Observable.prototype.observe = function(observer) {};
-
-
-/**
- * Unregisters an observer from the observable. The parameter must be
- * the same as those passed to {@code observe} method. Comparison is
- * done via observer's {@code equals} method.
- * @param {!goog.labs.observe.Observer} observer The observer to remove.
- * @return {boolean} Whether the observer is removed.
- */
-goog.labs.observe.Observable.prototype.unobserve = function(observer) {};
-
-
-/**
- * Notifies observers by invoking them. Optionally, a data object may be
- * given to be passed to each observer.
- * @param {*=} opt_data An optional data object.
- */
-goog.labs.observe.Observable.prototype.notify = function(opt_data) {};