98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
// Copyright 2011 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 Wraps an iterable storage mechanism and creates artificial
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* namespaces using a prefix in the global namespace.
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*
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*/
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goog.provide('goog.storage.mechanism.PrefixedMechanism');
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goog.require('goog.iter.Iterator');
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goog.require('goog.storage.mechanism.IterableMechanism');
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/**
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* Wraps an iterable storage mechanism and creates artificial namespaces.
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*
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* @param {!goog.storage.mechanism.IterableMechanism} mechanism Underlying
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* iterable storage mechanism.
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* @param {string} prefix Prefix for creating an artificial namespace.
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* @constructor
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* @extends {goog.storage.mechanism.IterableMechanism}
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*/
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goog.storage.mechanism.PrefixedMechanism = function(mechanism, prefix) {
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goog.base(this);
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this.mechanism_ = mechanism;
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this.prefix_ = prefix + '::';
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};
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goog.inherits(goog.storage.mechanism.PrefixedMechanism,
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goog.storage.mechanism.IterableMechanism);
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/**
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* The mechanism to be prefixed.
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*
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* @type {goog.storage.mechanism.IterableMechanism}
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* @private
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*/
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goog.storage.mechanism.PrefixedMechanism.prototype.mechanism_ = null;
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/**
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* The prefix for creating artificial namespaces.
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*
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* @type {string}
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* @private
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*/
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goog.storage.mechanism.PrefixedMechanism.prototype.prefix_ = '';
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/** @override */
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goog.storage.mechanism.PrefixedMechanism.prototype.set = function(key, value) {
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this.mechanism_.set(this.prefix_ + key, value);
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};
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/** @override */
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goog.storage.mechanism.PrefixedMechanism.prototype.get = function(key) {
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return this.mechanism_.get(this.prefix_ + key);
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};
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/** @override */
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goog.storage.mechanism.PrefixedMechanism.prototype.remove = function(key) {
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this.mechanism_.remove(this.prefix_ + key);
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};
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/** @override */
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goog.storage.mechanism.PrefixedMechanism.prototype.__iterator__ = function(
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opt_keys) {
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var subIter = this.mechanism_.__iterator__(true);
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var selfObj = this;
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var newIter = new goog.iter.Iterator();
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newIter.next = function() {
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var key = /** @type {string} */ (subIter.next());
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while (key.substr(0, selfObj.prefix_.length) != selfObj.prefix_) {
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key = /** @type {string} */ (subIter.next());
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}
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return opt_keys ? key.substr(selfObj.prefix_.length) :
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selfObj.mechanism_.get(key);
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};
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return newIter;
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};
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