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-// Copyright 2009 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 Useful compiler idioms.
- *
- * @author johnlenz@google.com (John Lenz)
- */
-
-goog.provide('goog.reflect');
-
-
-/**
- * Syntax for object literal casts.
- * @see http://go/jscompiler-renaming
- * @see https://goo.gl/CRs09P
- *
- * Use this if you have an object literal whose keys need to have the same names
- * as the properties of some class even after they are renamed by the compiler.
- *
- * @param {!Function} type Type to cast to.
- * @param {Object} object Object literal to cast.
- * @return {Object} The object literal.
- */
-goog.reflect.object = function(type, object) {
- return object;
-};
-
-/**
- * Syntax for renaming property strings.
- * @see http://go/jscompiler-renaming
- * @see https://goo.gl/CRs09P
- *
- * Use this if you have an need to access a property as a string, but want
- * to also have the property renamed by the compiler. In contrast to
- * goog.reflect.object, this method takes an instance of an object.
- *
- * Properties must be simple names (not qualified names).
- *
- * @param {string} prop Name of the property
- * @param {!Object} object Instance of the object whose type will be used
- * for renaming
- * @return {string} The renamed property.
- */
-goog.reflect.objectProperty = function(prop, object) {
- return prop;
-};
-
-/**
- * To assert to the compiler that an operation is needed when it would
- * otherwise be stripped. For example:
- * <code>
- * // Force a layout
- * goog.reflect.sinkValue(dialog.offsetHeight);
- * </code>
- * @param {T} x
- * @return {T}
- * @template T
- */
-goog.reflect.sinkValue = function(x) {
- goog.reflect.sinkValue[' '](x);
- return x;
-};
-
-
-/**
- * The compiler should optimize this function away iff no one ever uses
- * goog.reflect.sinkValue.
- */
-goog.reflect.sinkValue[' '] = goog.nullFunction;
-
-
-/**
- * Check if a property can be accessed without throwing an exception.
- * @param {Object} obj The owner of the property.
- * @param {string} prop The property name.
- * @return {boolean} Whether the property is accessible. Will also return true
- * if obj is null.
- */
-goog.reflect.canAccessProperty = function(obj, prop) {
- /** @preserveTry */
- try {
- goog.reflect.sinkValue(obj[prop]);
- return true;
- } catch (e) {
- }
- return false;
-};
-
-
-/**
- * Retrieves a value from a cache given a key. The compiler provides special
- * consideration for this call such that it is generally considered side-effect
- * free. However, if the {@code opt_keyFn} or {@code valueFn} have side-effects
- * then the entire call is considered to have side-effects.
- *
- * Conventionally storing the value on the cache would be considered a
- * side-effect and preclude unused calls from being pruned, ie. even if
- * the value was never used, it would still always be stored in the cache.
- *
- * Providing a side-effect free {@code valueFn} and {@code opt_keyFn}
- * allows unused calls to {@code goog.cache} to be pruned.
- *
- * @param {!Object<K, V>} cacheObj The object that contains the cached values.
- * @param {?} key The key to lookup in the cache. If it is not string or number
- * then a {@code opt_keyFn} should be provided. The key is also used as the
- * parameter to the {@code valueFn}.
- * @param {!function(?):V} valueFn The value provider to use to calculate the
- * value to store in the cache. This function should be side-effect free
- * to take advantage of the optimization.
- * @param {function(?):K=} opt_keyFn The key provider to determine the cache
- * map key. This should be used if the given key is not a string or number.
- * If not provided then the given key is used. This function should be
- * side-effect free to take advantage of the optimization.
- * @return {V} The cached or calculated value.
- * @template K
- * @template V
- */
-goog.reflect.cache = function(cacheObj, key, valueFn, opt_keyFn) {
- var storedKey = opt_keyFn ? opt_keyFn(key) : key;
-
- if (Object.prototype.hasOwnProperty.call(cacheObj, storedKey)) {
- return cacheObj[storedKey];
- }
-
- return (cacheObj[storedKey] = valueFn(key));
-};