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+// Copyright 2006 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 Datastructure: Hash Map.
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ *
+ * This file contains an implementation of a Map structure. It implements a lot
+ * of the methods used in goog.structs so those functions work on hashes. This
+ * is best suited for complex key types. For simple keys such as numbers and
+ * strings consider using the lighter-weight utilities in goog.object.
+ */
+
+
+goog.provide('goog.structs.Map');
+
+goog.require('goog.iter.Iterator');
+goog.require('goog.iter.StopIteration');
+goog.require('goog.object');
+
+
+
+/**
+ * Class for Hash Map datastructure.
+ * @param {*=} opt_map Map or Object to initialize the map with.
+ * @param {...*} var_args If 2 or more arguments are present then they
+ *     will be used as key-value pairs.
+ * @constructor
+ * @template K, V
+ * @deprecated This type is misleading: use ES6 Map instead.
+ */
+goog.structs.Map = function(opt_map, var_args) {
+
+  /**
+   * Underlying JS object used to implement the map.
+   * @private {!Object}
+   */
+  this.map_ = {};
+
+  /**
+   * An array of keys. This is necessary for two reasons:
+   *   1. Iterating the keys using for (var key in this.map_) allocates an
+   *      object for every key in IE which is really bad for IE6 GC perf.
+   *   2. Without a side data structure, we would need to escape all the keys
+   *      as that would be the only way we could tell during iteration if the
+   *      key was an internal key or a property of the object.
+   *
+   * This array can contain deleted keys so it's necessary to check the map
+   * as well to see if the key is still in the map (this doesn't require a
+   * memory allocation in IE).
+   * @private {!Array<string>}
+   */
+  this.keys_ = [];
+
+  /**
+   * The number of key value pairs in the map.
+   * @private {number}
+   */
+  this.count_ = 0;
+
+  /**
+   * Version used to detect changes while iterating.
+   * @private {number}
+   */
+  this.version_ = 0;
+
+  var argLength = arguments.length;
+
+  if (argLength > 1) {
+    if (argLength % 2) {
+      throw Error('Uneven number of arguments');
+    }
+    for (var i = 0; i < argLength; i += 2) {
+      this.set(arguments[i], arguments[i + 1]);
+    }
+  } else if (opt_map) {
+    this.addAll(/** @type {Object} */ (opt_map));
+  }
+};
+
+
+/**
+ * @return {number} The number of key-value pairs in the map.
+ */
+goog.structs.Map.prototype.getCount = function() {
+  return this.count_;
+};
+
+
+/**
+ * Returns the values of the map.
+ * @return {!Array<V>} The values in the map.
+ */
+goog.structs.Map.prototype.getValues = function() {
+  this.cleanupKeysArray_();
+
+  var rv = [];
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    rv.push(this.map_[key]);
+  }
+  return rv;
+};
+
+
+/**
+ * Returns the keys of the map.
+ * @return {!Array<string>} Array of string values.
+ */
+goog.structs.Map.prototype.getKeys = function() {
+  this.cleanupKeysArray_();
+  return /** @type {!Array<string>} */ (this.keys_.concat());
+};
+
+
+/**
+ * Whether the map contains the given key.
+ * @param {*} key The key to check for.
+ * @return {boolean} Whether the map contains the key.
+ */
+goog.structs.Map.prototype.containsKey = function(key) {
+  return goog.structs.Map.hasKey_(this.map_, key);
+};
+
+
+/**
+ * Whether the map contains the given value. This is O(n).
+ * @param {V} val The value to check for.
+ * @return {boolean} Whether the map contains the value.
+ */
+goog.structs.Map.prototype.containsValue = function(val) {
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    if (goog.structs.Map.hasKey_(this.map_, key) && this.map_[key] == val) {
+      return true;
+    }
+  }
+  return false;
+};
+
+
+/**
+ * Whether this map is equal to the argument map.
+ * @param {goog.structs.Map} otherMap The map against which to test equality.
+ * @param {function(V, V): boolean=} opt_equalityFn Optional equality function
+ *     to test equality of values. If not specified, this will test whether
+ *     the values contained in each map are identical objects.
+ * @return {boolean} Whether the maps are equal.
+ */
+goog.structs.Map.prototype.equals = function(otherMap, opt_equalityFn) {
+  if (this === otherMap) {
+    return true;
+  }
+
+  if (this.count_ != otherMap.getCount()) {
+    return false;
+  }
+
+  var equalityFn = opt_equalityFn || goog.structs.Map.defaultEquals;
+
+  this.cleanupKeysArray_();
+  for (var key, i = 0; key = this.keys_[i]; i++) {
+    if (!equalityFn(this.get(key), otherMap.get(key))) {
+      return false;
+    }
+  }
+
+  return true;
+};
+
+
+/**
+ * Default equality test for values.
+ * @param {*} a The first value.
+ * @param {*} b The second value.
+ * @return {boolean} Whether a and b reference the same object.
+ */
+goog.structs.Map.defaultEquals = function(a, b) {
+  return a === b;
+};
+
+
+/**
+ * @return {boolean} Whether the map is empty.
+ */
+goog.structs.Map.prototype.isEmpty = function() {
+  return this.count_ == 0;
+};
+
+
+/**
+ * Removes all key-value pairs from the map.
+ */
+goog.structs.Map.prototype.clear = function() {
+  this.map_ = {};
+  this.keys_.length = 0;
+  this.count_ = 0;
+  this.version_ = 0;
+};
+
+
+/**
+ * Removes a key-value pair based on the key. This is O(logN) amortized due to
+ * updating the keys array whenever the count becomes half the size of the keys
+ * in the keys array.
+ * @param {*} key  The key to remove.
+ * @return {boolean} Whether object was removed.
+ */
+goog.structs.Map.prototype.remove = function(key) {
+  if (goog.structs.Map.hasKey_(this.map_, key)) {
+    delete this.map_[key];
+    this.count_--;
+    this.version_++;
+
+    // clean up the keys array if the threshold is hit
+    if (this.keys_.length > 2 * this.count_) {
+      this.cleanupKeysArray_();
+    }
+
+    return true;
+  }
+  return false;
+};
+
+
+/**
+ * Cleans up the temp keys array by removing entries that are no longer in the
+ * map.
+ * @private
+ */
+goog.structs.Map.prototype.cleanupKeysArray_ = function() {
+  if (this.count_ != this.keys_.length) {
+    // First remove keys that are no longer in the map.
+    var srcIndex = 0;
+    var destIndex = 0;
+    while (srcIndex < this.keys_.length) {
+      var key = this.keys_[srcIndex];
+      if (goog.structs.Map.hasKey_(this.map_, key)) {
+        this.keys_[destIndex++] = key;
+      }
+      srcIndex++;
+    }
+    this.keys_.length = destIndex;
+  }
+
+  if (this.count_ != this.keys_.length) {
+    // If the count still isn't correct, that means we have duplicates. This can
+    // happen when the same key is added and removed multiple times. Now we have
+    // to allocate one extra Object to remove the duplicates. This could have
+    // been done in the first pass, but in the common case, we can avoid
+    // allocating an extra object by only doing this when necessary.
+    var seen = {};
+    var srcIndex = 0;
+    var destIndex = 0;
+    while (srcIndex < this.keys_.length) {
+      var key = this.keys_[srcIndex];
+      if (!(goog.structs.Map.hasKey_(seen, key))) {
+        this.keys_[destIndex++] = key;
+        seen[key] = 1;
+      }
+      srcIndex++;
+    }
+    this.keys_.length = destIndex;
+  }
+};
+
+
+/**
+ * Returns the value for the given key.  If the key is not found and the default
+ * value is not given this will return {@code undefined}.
+ * @param {*} key The key to get the value for.
+ * @param {DEFAULT=} opt_val The value to return if no item is found for the
+ *     given key, defaults to undefined.
+ * @return {V|DEFAULT} The value for the given key.
+ * @template DEFAULT
+ */
+goog.structs.Map.prototype.get = function(key, opt_val) {
+  if (goog.structs.Map.hasKey_(this.map_, key)) {
+    return this.map_[key];
+  }
+  return opt_val;
+};
+
+
+/**
+ * Adds a key-value pair to the map.
+ * @param {*} key The key.
+ * @param {V} value The value to add.
+ * @return {*} Some subclasses return a value.
+ */
+goog.structs.Map.prototype.set = function(key, value) {
+  if (!(goog.structs.Map.hasKey_(this.map_, key))) {
+    this.count_++;
+    // TODO(johnlenz): This class lies, it claims to return an array of string
+    // keys, but instead returns the original object used.
+    this.keys_.push(/** @type {?} */ (key));
+    // Only change the version if we add a new key.
+    this.version_++;
+  }
+  this.map_[key] = value;
+};
+
+
+/**
+ * Adds multiple key-value pairs from another goog.structs.Map or Object.
+ * @param {Object} map  Object containing the data to add.
+ */
+goog.structs.Map.prototype.addAll = function(map) {
+  var keys, values;
+  if (map instanceof goog.structs.Map) {
+    keys = map.getKeys();
+    values = map.getValues();
+  } else {
+    keys = goog.object.getKeys(map);
+    values = goog.object.getValues(map);
+  }
+  // we could use goog.array.forEach here but I don't want to introduce that
+  // dependency just for this.
+  for (var i = 0; i < keys.length; i++) {
+    this.set(keys[i], values[i]);
+  }
+};
+
+
+/**
+ * Calls the given function on each entry in the map.
+ * @param {function(this:T, V, K, goog.structs.Map<K,V>)} f
+ * @param {T=} opt_obj The value of "this" inside f.
+ * @template T
+ */
+goog.structs.Map.prototype.forEach = function(f, opt_obj) {
+  var keys = this.getKeys();
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    var value = this.get(key);
+    f.call(opt_obj, value, key, this);
+  }
+};
+
+
+/**
+ * Clones a map and returns a new map.
+ * @return {!goog.structs.Map} A new map with the same key-value pairs.
+ */
+goog.structs.Map.prototype.clone = function() {
+  return new goog.structs.Map(this);
+};
+
+
+/**
+ * Returns a new map in which all the keys and values are interchanged
+ * (keys become values and values become keys). If multiple keys map to the
+ * same value, the chosen transposed value is implementation-dependent.
+ *
+ * It acts very similarly to {goog.object.transpose(Object)}.
+ *
+ * @return {!goog.structs.Map} The transposed map.
+ */
+goog.structs.Map.prototype.transpose = function() {
+  var transposed = new goog.structs.Map();
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    var value = this.map_[key];
+    transposed.set(value, key);
+  }
+
+  return transposed;
+};
+
+
+/**
+ * @return {!Object} Object representation of the map.
+ */
+goog.structs.Map.prototype.toObject = function() {
+  this.cleanupKeysArray_();
+  var obj = {};
+  for (var i = 0; i < this.keys_.length; i++) {
+    var key = this.keys_[i];
+    obj[key] = this.map_[key];
+  }
+  return obj;
+};
+
+
+/**
+ * Returns an iterator that iterates over the keys in the map.  Removal of keys
+ * while iterating might have undesired side effects.
+ * @return {!goog.iter.Iterator} An iterator over the keys in the map.
+ */
+goog.structs.Map.prototype.getKeyIterator = function() {
+  return this.__iterator__(true);
+};
+
+
+/**
+ * Returns an iterator that iterates over the values in the map.  Removal of
+ * keys while iterating might have undesired side effects.
+ * @return {!goog.iter.Iterator} An iterator over the values in the map.
+ */
+goog.structs.Map.prototype.getValueIterator = function() {
+  return this.__iterator__(false);
+};
+
+
+/**
+ * Returns an iterator that iterates over the values or the keys in the map.
+ * This throws an exception if the map was mutated since the iterator was
+ * created.
+ * @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} An iterator over the values or keys in the map.
+ */
+goog.structs.Map.prototype.__iterator__ = function(opt_keys) {
+  // Clean up keys to minimize the risk of iterating over dead keys.
+  this.cleanupKeysArray_();
+
+  var i = 0;
+  var version = this.version_;
+  var selfObj = this;
+
+  var newIter = new goog.iter.Iterator;
+  newIter.next = function() {
+    if (version != selfObj.version_) {
+      throw Error('The map has changed since the iterator was created');
+    }
+    if (i >= selfObj.keys_.length) {
+      throw goog.iter.StopIteration;
+    }
+    var key = selfObj.keys_[i++];
+    return opt_keys ? key : selfObj.map_[key];
+  };
+  return newIter;
+};
+
+
+/**
+ * Safe way to test for hasOwnProperty.  It even allows testing for
+ * 'hasOwnProperty'.
+ * @param {Object} obj The object to test for presence of the given key.
+ * @param {*} key The key to check for.
+ * @return {boolean} Whether the object has the key.
+ * @private
+ */
+goog.structs.Map.hasKey_ = function(obj, key) {
+  return Object.prototype.hasOwnProperty.call(obj, key);
+};