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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) {
+
+ 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.reflect.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));
+};