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+// Copyright 2005 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 Implements the disposable interface. The dispose method is used
+ * to clean up references and resources.
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+
+goog.provide('goog.Disposable');
+/** @suppress {extraProvide} */
+goog.provide('goog.dispose');
+/** @suppress {extraProvide} */
+goog.provide('goog.disposeAll');
+
+goog.require('goog.disposable.IDisposable');
+
+
+
+/**
+ * Class that provides the basic implementation for disposable objects. If your
+ * class holds one or more references to COM objects, DOM nodes, or other
+ * disposable objects, it should extend this class or implement the disposable
+ * interface (defined in goog.disposable.IDisposable).
+ * @constructor
+ * @implements {goog.disposable.IDisposable}
+ */
+goog.Disposable = function() {
+ if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
+ if (goog.Disposable.INCLUDE_STACK_ON_CREATION) {
+ this.creationStack = new Error().stack;
+ }
+ goog.Disposable.instances_[goog.getUid(this)] = this;
+ }
+ // Support sealing
+ this.disposed_ = this.disposed_;
+ this.onDisposeCallbacks_ = this.onDisposeCallbacks_;
+};
+
+
+/**
+ * @enum {number} Different monitoring modes for Disposable.
+ */
+goog.Disposable.MonitoringMode = {
+ /**
+ * No monitoring.
+ */
+ OFF: 0,
+ /**
+ * Creating and disposing the goog.Disposable instances is monitored. All
+ * disposable objects need to call the {@code goog.Disposable} base
+ * constructor. The PERMANENT mode must be switched on before creating any
+ * goog.Disposable instances.
+ */
+ PERMANENT: 1,
+ /**
+ * INTERACTIVE mode can be switched on and off on the fly without producing
+ * errors. It also doesn't warn if the disposable objects don't call the
+ * {@code goog.Disposable} base constructor.
+ */
+ INTERACTIVE: 2
+};
+
+
+/**
+ * @define {number} The monitoring mode of the goog.Disposable
+ * instances. Default is OFF. Switching on the monitoring is only
+ * recommended for debugging because it has a significant impact on
+ * performance and memory usage. If switched off, the monitoring code
+ * compiles down to 0 bytes.
+ */
+goog.define('goog.Disposable.MONITORING_MODE', 0);
+
+
+/**
+ * @define {boolean} Whether to attach creation stack to each created disposable
+ * instance; This is only relevant for when MonitoringMode != OFF.
+ */
+goog.define('goog.Disposable.INCLUDE_STACK_ON_CREATION', true);
+
+
+/**
+ * Maps the unique ID of every undisposed {@code goog.Disposable} object to
+ * the object itself.
+ * @type {!Object<number, !goog.Disposable>}
+ * @private
+ */
+goog.Disposable.instances_ = {};
+
+
+/**
+ * @return {!Array<!goog.Disposable>} All {@code goog.Disposable} objects that
+ * haven't been disposed of.
+ */
+goog.Disposable.getUndisposedObjects = function() {
+ var ret = [];
+ for (var id in goog.Disposable.instances_) {
+ if (goog.Disposable.instances_.hasOwnProperty(id)) {
+ ret.push(goog.Disposable.instances_[Number(id)]);
+ }
+ }
+ return ret;
+};
+
+
+/**
+ * Clears the registry of undisposed objects but doesn't dispose of them.
+ */
+goog.Disposable.clearUndisposedObjects = function() {
+ goog.Disposable.instances_ = {};
+};
+
+
+/**
+ * Whether the object has been disposed of.
+ * @type {boolean}
+ * @private
+ */
+goog.Disposable.prototype.disposed_ = false;
+
+
+/**
+ * Callbacks to invoke when this object is disposed.
+ * @type {Array<!Function>}
+ * @private
+ */
+goog.Disposable.prototype.onDisposeCallbacks_;
+
+
+/**
+ * If monitoring the goog.Disposable instances is enabled, stores the creation
+ * stack trace of the Disposable instance.
+ * @const {string}
+ */
+goog.Disposable.prototype.creationStack;
+
+
+/**
+ * @return {boolean} Whether the object has been disposed of.
+ * @override
+ */
+goog.Disposable.prototype.isDisposed = function() {
+ return this.disposed_;
+};
+
+
+/**
+ * @return {boolean} Whether the object has been disposed of.
+ * @deprecated Use {@link #isDisposed} instead.
+ */
+goog.Disposable.prototype.getDisposed = goog.Disposable.prototype.isDisposed;
+
+
+/**
+ * Disposes of the object. If the object hasn't already been disposed of, calls
+ * {@link #disposeInternal}. Classes that extend {@code goog.Disposable} should
+ * override {@link #disposeInternal} in order to delete references to COM
+ * objects, DOM nodes, and other disposable objects. Reentrant.
+ *
+ * @return {void} Nothing.
+ * @override
+ */
+goog.Disposable.prototype.dispose = function() {
+ if (!this.disposed_) {
+ // Set disposed_ to true first, in case during the chain of disposal this
+ // gets disposed recursively.
+ this.disposed_ = true;
+ this.disposeInternal();
+ if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {
+ var uid = goog.getUid(this);
+ if (goog.Disposable.MONITORING_MODE ==
+ goog.Disposable.MonitoringMode.PERMANENT &&
+ !goog.Disposable.instances_.hasOwnProperty(uid)) {
+ throw Error(
+ this + ' did not call the goog.Disposable base ' +
+ 'constructor or was disposed of after a clearUndisposedObjects ' +
+ 'call');
+ }
+ delete goog.Disposable.instances_[uid];
+ }
+ }
+};
+
+
+/**
+ * Associates a disposable object with this object so that they will be disposed
+ * together.
+ * @param {goog.disposable.IDisposable} disposable that will be disposed when
+ * this object is disposed.
+ */
+goog.Disposable.prototype.registerDisposable = function(disposable) {
+ this.addOnDisposeCallback(goog.partial(goog.dispose, disposable));
+};
+
+
+/**
+ * Invokes a callback function when this object is disposed. Callbacks are
+ * invoked in the order in which they were added. If a callback is added to
+ * an already disposed Disposable, it will be called immediately.
+ * @param {function(this:T):?} callback The callback function.
+ * @param {T=} opt_scope An optional scope to call the callback in.
+ * @template T
+ */
+goog.Disposable.prototype.addOnDisposeCallback = function(callback, opt_scope) {
+ if (this.disposed_) {
+ callback.call(opt_scope);
+ return;
+ }
+ if (!this.onDisposeCallbacks_) {
+ this.onDisposeCallbacks_ = [];
+ }
+
+ this.onDisposeCallbacks_.push(
+ goog.isDef(opt_scope) ? goog.bind(callback, opt_scope) : callback);
+};
+
+
+/**
+ * Deletes or nulls out any references to COM objects, DOM nodes, or other
+ * disposable objects. Classes that extend {@code goog.Disposable} should
+ * override this method.
+ * Not reentrant. To avoid calling it twice, it must only be called from the
+ * subclass' {@code disposeInternal} method. Everywhere else the public
+ * {@code dispose} method must be used.
+ * For example:
+ * <pre>
+ * mypackage.MyClass = function() {
+ * mypackage.MyClass.base(this, 'constructor');
+ * // Constructor logic specific to MyClass.
+ * ...
+ * };
+ * goog.inherits(mypackage.MyClass, goog.Disposable);
+ *
+ * mypackage.MyClass.prototype.disposeInternal = function() {
+ * // Dispose logic specific to MyClass.
+ * ...
+ * // Call superclass's disposeInternal at the end of the subclass's, like
+ * // in C++, to avoid hard-to-catch issues.
+ * mypackage.MyClass.base(this, 'disposeInternal');
+ * };
+ * </pre>
+ * @protected
+ */
+goog.Disposable.prototype.disposeInternal = function() {
+ if (this.onDisposeCallbacks_) {
+ while (this.onDisposeCallbacks_.length) {
+ this.onDisposeCallbacks_.shift()();
+ }
+ }
+};
+
+
+/**
+ * Returns True if we can verify the object is disposed.
+ * Calls {@code isDisposed} on the argument if it supports it. If obj
+ * is not an object with an isDisposed() method, return false.
+ * @param {*} obj The object to investigate.
+ * @return {boolean} True if we can verify the object is disposed.
+ */
+goog.Disposable.isDisposed = function(obj) {
+ if (obj && typeof obj.isDisposed == 'function') {
+ return obj.isDisposed();
+ }
+ return false;
+};
+
+
+/**
+ * Calls {@code dispose} on the argument if it supports it. If obj is not an
+ * object with a dispose() method, this is a no-op.
+ * @param {*} obj The object to dispose of.
+ */
+goog.dispose = function(obj) {
+ if (obj && typeof obj.dispose == 'function') {
+ obj.dispose();
+ }
+};
+
+
+/**
+ * Calls {@code dispose} on each member of the list that supports it. (If the
+ * member is an ArrayLike, then {@code goog.disposeAll()} will be called
+ * recursively on each of its members.) If the member is not an object with a
+ * {@code dispose()} method, then it is ignored.
+ * @param {...*} var_args The list.
+ */
+goog.disposeAll = function(var_args) {
+ for (var i = 0, len = arguments.length; i < len; ++i) {
+ var disposable = arguments[i];
+ if (goog.isArrayLike(disposable)) {
+ goog.disposeAll.apply(null, disposable);
+ } else {
+ goog.dispose(disposable);
+ }
+ }
+};