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// Copyright 2007 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 Callback object that counts matches.
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 *
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 * @author [email protected] (Robby Walker)
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 */
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goog.provide('goog.dom.pattern.callback.Counter');
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/**
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 * Callback class for counting matches.
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 * @constructor
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 * @final
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 */
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goog.dom.pattern.callback.Counter = function() {
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  /**
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   * The count of objects matched so far.
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   *
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   * @type {number}
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   */
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  this.count = 0;
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  /**
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   * The callback function.  Suitable as a callback for
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   * {@link goog.dom.pattern.Matcher}.
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   * @private {Function}
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   */
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  this.callback_ = null;
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};
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/**
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 * Get a bound callback function that is suitable as a callback for
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 * {@link goog.dom.pattern.Matcher}.
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 *
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 * @return {!Function} A callback function.
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 */
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goog.dom.pattern.callback.Counter.prototype.getCallback = function() {
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  if (!this.callback_) {
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    this.callback_ = goog.bind(function() {
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      this.count++;
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      return false;
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    }, this);
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  }
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  return this.callback_;
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};
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/**
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 * Reset the counter.
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 */
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goog.dom.pattern.callback.Counter.prototype.reset = function() {
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  this.count = 0;
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};
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