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// Copyright 2011 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 Interface for storing, retieving and scanning data using some
* persistence mechanism.
*
*/
goog.provide('goog.storage.mechanism.IterableMechanism');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.iter');
goog.require('goog.iter.Iterator');
goog.require('goog.storage.mechanism.Mechanism');
/**
* Interface for all iterable storage mechanisms.
*
* @constructor
* @extends {goog.storage.mechanism.Mechanism}
*/
goog.storage.mechanism.IterableMechanism = function() {
goog.base(this);
};
goog.inherits(goog.storage.mechanism.IterableMechanism,
goog.storage.mechanism.Mechanism);
/**
* Get the number of stored key-value pairs.
*
* Could be overridden in a subclass, as the default implementation is not very
* efficient - it iterates over all keys.
*
* @return {number} Number of stored elements.
*/
goog.storage.mechanism.IterableMechanism.prototype.getCount = function() {
var count = 0;
goog.iter.forEach(this.__iterator__(true), function(key) {
goog.asserts.assertString(key);
count++;
});
return count;
};
/**
* Returns an iterator that iterates over the elements in the storage. Will
* throw goog.iter.StopIteration after the last element.
*
* @param {boolean=} opt_keys True to iterate over the keys. False to iterate
* over the values. The default value is false.
* @return {!goog.iter.Iterator} The iterator.
*/
goog.storage.mechanism.IterableMechanism.prototype.__iterator__ =
goog.abstractMethod;
/**
* Remove all key-value pairs.
*
* Could be overridden in a subclass, as the default implementation is not very
* efficient - it iterates over all keys.
*/
goog.storage.mechanism.IterableMechanism.prototype.clear = function() {
var keys = goog.iter.toArray(this.__iterator__(true));
var selfObj = this;
goog.array.forEach(keys, function(key) {
selfObj.remove(key);
});
};
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