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// Copyright 2012 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//      http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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 * @fileoverview An adaptor from a Result to a Deferred.
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 *
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 * TODO (vbhasin): cancel() support.
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 * TODO (vbhasin): See if we can make this a static.
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 * TODO (gboyer, vbhasin): Rename to "Adapter" once this graduates; this is the
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 * proper programmer spelling.
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 */
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goog.provide('goog.result.DeferredAdaptor');
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goog.require('goog.async.Deferred');
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goog.require('goog.result');
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goog.require('goog.result.Result');
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/**
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 * An adaptor from Result to a Deferred, for use with existing Deferred chains.
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 *
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 * @param {!goog.result.Result} result A result.
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 * @constructor
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 * @extends {goog.async.Deferred}
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 * @final
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 * @deprecated Use {@link goog.Promise} instead - http://go/promisemigration
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 */
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goog.result.DeferredAdaptor = function(result) {
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  goog.result.DeferredAdaptor.base(this, 'constructor');
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  goog.result.wait(result, function(result) {
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    if (this.hasFired()) {
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      return;
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    }
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    if (result.getState() == goog.result.Result.State.SUCCESS) {
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      this.callback(result.getValue());
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    } else if (result.getState() == goog.result.Result.State.ERROR) {
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      if (result.getError() instanceof goog.result.Result.CancelError) {
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        this.cancel();
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      } else {
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        this.errback(result.getError());
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      }
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    }
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  }, this);
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};
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goog.inherits(goog.result.DeferredAdaptor, goog.async.Deferred);
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