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Viewing file:     disposables.js (6.51 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.SerialDisposable = exports.CompositeDisposable = exports.Disposable = void 0;

var _js_utils = require("../utils/js_utils");

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

/**
 * Provides a set of static methods for creating Disposables.
 * @param {Function} action Action to run during the first call to dispose.
 * The action is guaranteed to be run at most once.
 */
var Disposable =
/*#__PURE__*/
function () {
  function Disposable(action) {
    _classCallCheck(this, Disposable);

    this.isDisposed = false;
    this.action = (0, _js_utils.isFunction)(action) ? action : _js_utils.noop;
  }
  /**
   * Validates whether the given object is a disposable
   * @param {Object} Object to test whether it has a dispose method
   * @returns {Boolean} true if a disposable object, else false.
   */


  _createClass(Disposable, [{
    key: "dispose",

    /** Performs the task of cleaning up resources. */
    value: function dispose() {
      if (!this.isDisposed) {
        this.action();
        this.isDisposed = true;
      }
    }
  }], [{
    key: "isDisposable",
    value: function isDisposable(d) {
      return d && (0, _js_utils.isFunction)(d.dispose);
    }
  }, {
    key: "_fixup",
    value: function _fixup(result) {
      return Disposable.isDisposable(result) ? result : Disposable.empty;
    }
    /**
     * Creates a disposable object that invokes the specified action when disposed.
     * @param {Function} dispose Action to run during the first call to dispose.
     * The action is guaranteed to be run at most once.
     * @return {Disposable} The disposable object that runs the given action upon disposal.
     */

  }, {
    key: "create",
    value: function create(action) {
      return new Disposable(action);
    }
  }]);

  return Disposable;
}();
/**
 * Gets the disposable that does nothing when disposed.
 */


exports.Disposable = Disposable;
Disposable.empty = {
  dispose: _js_utils.noop
};
/**
 * Represents a group of disposable resources that are disposed together.
 * @constructor
 */

var CompositeDisposable =
/*#__PURE__*/
function () {
  function CompositeDisposable() {
    _classCallCheck(this, CompositeDisposable);

    this.isDisposed = false;

    for (var _len = arguments.length, disposables = new Array(_len), _key = 0; _key < _len; _key++) {
      disposables[_key] = arguments[_key];
    }

    this.disposables = disposables;
  }
  /**
   * Adds a disposable to the CompositeDisposable or disposes the disposable if the CompositeDisposable is disposed.
   * @param {Any} item Disposable to add.
   */


  _createClass(CompositeDisposable, [{
    key: "add",
    value: function add(item) {
      if (this.isDisposed) {
        item.dispose();
      } else {
        this.disposables.push(item);
      }
    }
    /**
     * Removes and disposes the first occurrence of a disposable from the CompositeDisposable.
     * @param {Any} item Disposable to remove.
     * @returns {Boolean} true if found; false otherwise.
     */

  }, {
    key: "remove",
    value: function remove(item) {
      var shouldDispose = false;

      if (!this.isDisposed) {
        var idx = this.disposables.indexOf(item);

        if (idx !== -1) {
          shouldDispose = true;
          this.disposables.splice(idx, 1);
          item.dispose();
        }
      }

      return shouldDispose;
    }
    /**
     *  Disposes all disposables in the group and removes them from the group but
     *  does not dispose the CompositeDisposable.
     */

  }, {
    key: "clear",
    value: function clear() {
      if (!this.isDisposed) {
        var len = this.disposables.length;
        var currentDisposables = new Array(len);

        for (var i = 0; i < len; i++) {
          currentDisposables[i] = this.disposables[i];
        }

        this.disposables = [];

        for (var _i = 0; _i < len; _i++) {
          currentDisposables[_i].dispose();
        }
      }
    }
    /**
     *  Disposes all disposables in the group and removes them from the group.
     */

  }, {
    key: "dispose",
    value: function dispose() {
      if (!this.isDisposed) {
        this.isDisposed = true;
        var len = this.disposables.length;
        var currentDisposables = new Array(len);

        for (var i = 0; i < len; i++) {
          currentDisposables[i] = this.disposables[i];
        }

        this.disposables = [];

        for (var _i2 = 0; _i2 < len; _i2++) {
          currentDisposables[_i2].dispose();
        }
      }
    }
  }]);

  return CompositeDisposable;
}();
/**
 * Represents a disposable resource whose underlying disposable resource can
 * be replaced by another disposable resource, causing automatic disposal of
 * the previous underlying disposable resource.
 */


exports.CompositeDisposable = CompositeDisposable;

var SerialDisposable =
/*#__PURE__*/
function () {
  function SerialDisposable() {
    _classCallCheck(this, SerialDisposable);

    this.isDisposed = false;
  }
  /**
   * Gets the underlying disposable.
   * @returns {Any} the underlying disposable.
   */


  _createClass(SerialDisposable, [{
    key: "getDisposable",
    value: function getDisposable() {
      return this.current;
    }
  }, {
    key: "setDisposable",
    value: function setDisposable(value) {
      var shouldDispose = this.isDisposed;

      if (!shouldDispose) {
        var old = this.current;
        this.current = value;

        if (old) {
          old.dispose();
        }
      }

      if (shouldDispose && value) {
        value.dispose();
      }
    }
    /** Performs the task of cleaning up resources. */

  }, {
    key: "dispose",
    value: function dispose() {
      if (!this.isDisposed) {
        this.isDisposed = true;
        var old = this.current;
        this.current = undefined;

        if (old) {
          old.dispose();
        }
      }
    }
  }]);

  return SerialDisposable;
}();

exports.SerialDisposable = SerialDisposable;