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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* The `DominatorTreeLazyChildren` is a placeholder that represents a future
* subtree in an existing `DominatorTreeNode` tree that is currently being
* incrementally fetched from the `HeapAnalysesWorker`.
*
* @param {NodeId} parentNodeId
* @param {Number} siblingIndex
*/
function DominatorTreeLazyChildren(parentNodeId, siblingIndex) {
this._parentNodeId = parentNodeId;
this._siblingIndex = siblingIndex;
}
/**
* Generate a unique key for this `DominatorTreeLazyChildren` instance. This can
* be used as the key in a hash table or as the `key` property for a React
* component, for example.
*
* @returns {String}
*/
DominatorTreeLazyChildren.prototype.key = function () {
return `dominator-tree-lazy-children-${this._parentNodeId}-${this._siblingIndex}`;
};
/**
* Return true if this is a placeholder for the first child of its
* parent. Return false if it is a placeholder for loading more of its parent's
* children.
*
* @returns {Boolean}
*/
DominatorTreeLazyChildren.prototype.isFirstChild = function () {
return this._siblingIndex === 0;
};
/**
* Get this subtree's parent node's identifier.
*
* @returns {NodeId}
*/
DominatorTreeLazyChildren.prototype.parentNodeId = function () {
return this._parentNodeId;
};
/**
* Get this subtree's index in its parent's children array.
*
* @returns {Number}
*/
DominatorTreeLazyChildren.prototype.siblingIndex = function () {
return this._siblingIndex;
};
module.exports = DominatorTreeLazyChildren;
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