/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { DataSource } from '@angular/cdk/collections';
import { BehaviorSubject, merge } from 'rxjs';
import { map, take } from 'rxjs/operators';
/**
 * Tree flattener to convert a normal type of node to node with children & level information.
 * Transform nested nodes of type `T` to flattened nodes of type `F`.
 *
 * For example, the input data of type `T` is nested, and contains its children data:
 *   SomeNode: {
 *     key: 'Fruits',
 *     children: [
 *       NodeOne: {
 *         key: 'Apple',
 *       },
 *       NodeTwo: {
 *        key: 'Pear',
 *      }
 *    ]
 *  }
 *  After flattener flatten the tree, the structure will become
 *  SomeNode: {
 *    key: 'Fruits',
 *    expandable: true,
 *    level: 1
 *  },
 *  NodeOne: {
 *    key: 'Apple',
 *    expandable: false,
 *    level: 2
 *  },
 *  NodeTwo: {
 *   key: 'Pear',
 *   expandable: false,
 *   level: 2
 * }
 * and the output flattened type is `F` with additional information.
 */
export class MatTreeFlattener {
    constructor(transformFunction, getLevel, isExpandable, getChildren) {
        this.transformFunction = transformFunction;
        this.getLevel = getLevel;
        this.isExpandable = isExpandable;
        this.getChildren = getChildren;
    }
    _flattenNode(node, level, resultNodes, parentMap) {
        const flatNode = this.transformFunction(node, level);
        resultNodes.push(flatNode);
        if (this.isExpandable(flatNode)) {
            const childrenNodes = this.getChildren(node);
            if (childrenNodes) {
                if (Array.isArray(childrenNodes)) {
                    this._flattenChildren(childrenNodes, level, resultNodes, parentMap);
                }
                else {
                    childrenNodes.pipe(take(1)).subscribe(children => {
                        this._flattenChildren(children, level, resultNodes, parentMap);
                    });
                }
            }
        }
        return resultNodes;
    }
    _flattenChildren(children, level, resultNodes, parentMap) {
        children.forEach((child, index) => {
            let childParentMap = parentMap.slice();
            childParentMap.push(index != children.length - 1);
            this._flattenNode(child, level + 1, resultNodes, childParentMap);
        });
    }
    /**
     * Flatten a list of node type T to flattened version of node F.
     * Please note that type T may be nested, and the length of `structuredData` may be different
     * from that of returned list `F[]`.
     */
    flattenNodes(structuredData) {
        let resultNodes = [];
        structuredData.forEach(node => this._flattenNode(node, 0, resultNodes, []));
        return resultNodes;
    }
    /**
     * Expand flattened node with current expansion status.
     * The returned list may have different length.
     */
    expandFlattenedNodes(nodes, treeControl) {
        let results = [];
        let currentExpand = [];
        currentExpand[0] = true;
        nodes.forEach(node => {
            let expand = true;
            for (let i = 0; i <= this.getLevel(node); i++) {
                expand = expand && currentExpand[i];
            }
            if (expand) {
                results.push(node);
            }
            if (this.isExpandable(node)) {
                currentExpand[this.getLevel(node) + 1] = treeControl.isExpanded(node);
            }
        });
        return results;
    }
}
/**
 * Data source for flat tree.
 * The data source need to handle expansion/collapsion of the tree node and change the data feed
 * to `MatTree`.
 * The nested tree nodes of type `T` are flattened through `MatTreeFlattener`, and converted
 * to type `F` for `MatTree` to consume.
 */
export class MatTreeFlatDataSource extends DataSource {
    constructor(_treeControl, _treeFlattener, initialData) {
        super();
        this._treeControl = _treeControl;
        this._treeFlattener = _treeFlattener;
        this._flattenedData = new BehaviorSubject([]);
        this._expandedData = new BehaviorSubject([]);
        this._data = new BehaviorSubject([]);
        if (initialData) {
            // Assign the data through the constructor to ensure that all of the logic is executed.
            this.data = initialData;
        }
    }
    get data() { return this._data.value; }
    set data(value) {
        this._data.next(value);
        this._flattenedData.next(this._treeFlattener.flattenNodes(this.data));
        this._treeControl.dataNodes = this._flattenedData.value;
    }
    connect(collectionViewer) {
        return merge(collectionViewer.viewChange, this._treeControl.expansionModel.changed, this._flattenedData).pipe(map(() => {
            this._expandedData.next(this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl));
            return this._expandedData.value;
        }));
    }
    disconnect() {
        // no op
    }
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {CollectionViewer, DataSource} from '@angular/cdk/collections';\nimport {FlatTreeControl, TreeControl} from '@angular/cdk/tree';\nimport {BehaviorSubject, merge, Observable} from 'rxjs';\nimport {map, take} from 'rxjs/operators';\n\n/**\n * Tree flattener to convert a normal type of node to node with children & level information.\n * Transform nested nodes of type `T` to flattened nodes of type `F`.\n *\n * For example, the input data of type `T` is nested, and contains its children data:\n *   SomeNode: {\n *     key: 'Fruits',\n *     children: [\n *       NodeOne: {\n *         key: 'Apple',\n *       },\n *       NodeTwo: {\n *        key: 'Pear',\n *      }\n *    ]\n *  }\n *  After flattener flatten the tree, the structure will become\n *  SomeNode: {\n *    key: 'Fruits',\n *    expandable: true,\n *    level: 1\n *  },\n *  NodeOne: {\n *    key: 'Apple',\n *    expandable: false,\n *    level: 2\n *  },\n *  NodeTwo: {\n *   key: 'Pear',\n *   expandable: false,\n *   level: 2\n * }\n * and the output flattened type is `F` with additional information.\n */\nexport class MatTreeFlattener<T, F, K = F> {\n\n  constructor(public transformFunction: (node: T, level: number) => F,\n              public getLevel: (node: F) => number,\n              public isExpandable: (node: F) => boolean,\n              public getChildren: (node: T) =>\n                  Observable<T[]> | T[] | undefined | null) {}\n\n  _flattenNode(node: T, level: number,\n               resultNodes: F[], parentMap: boolean[]): F[] {\n    const flatNode = this.transformFunction(node, level);\n    resultNodes.push(flatNode);\n\n    if (this.isExpandable(flatNode)) {\n      const childrenNodes = this.getChildren(node);\n      if (childrenNodes) {\n        if (Array.isArray(childrenNodes)) {\n          this._flattenChildren(childrenNodes, level, resultNodes, parentMap);\n        } else {\n          childrenNodes.pipe(take(1)).subscribe(children => {\n            this._flattenChildren(children, level, resultNodes, parentMap);\n          });\n        }\n      }\n    }\n    return resultNodes;\n  }\n\n  _flattenChildren(children: T[], level: number,\n                   resultNodes: F[], parentMap: boolean[]): void {\n    children.forEach((child, index) => {\n      let childParentMap: boolean[] = parentMap.slice();\n      childParentMap.push(index != children.length - 1);\n      this._flattenNode(child, level + 1, resultNodes, childParentMap);\n    });\n  }\n\n  /**\n   * Flatten a list of node type T to flattened version of node F.\n   * Please note that type T may be nested, and the length of `structuredData` may be different\n   * from that of returned list `F[]`.\n   */\n  flattenNodes(structuredData: T[]): F[] {\n    let resultNodes: F[] = [];\n    structuredData.forEach(node => this._flattenNode(node, 0, resultNodes, []));\n    return resultNodes;\n  }\n\n  /**\n   * Expand flattened node with current expansion status.\n   * The returned list may have different length.\n   */\n  expandFlattenedNodes(nodes: F[], treeControl: TreeControl<F, K>): F[] {\n    let results: F[] = [];\n    let currentExpand: boolean[] = [];\n    currentExpand[0] = true;\n\n    nodes.forEach(node => {\n      let expand = true;\n      for (let i = 0; i <= this.getLevel(node); i++) {\n        expand = expand && currentExpand[i];\n      }\n      if (expand) {\n        results.push(node);\n      }\n      if (this.isExpandable(node)) {\n        currentExpand[this.getLevel(node) + 1] = treeControl.isExpanded(node);\n      }\n    });\n    return results;\n  }\n}\n\n\n/**\n * Data source for flat tree.\n * The data source need to handle expansion/collapsion of the tree node and change the data feed\n * to `MatTree`.\n * The nested tree nodes of type `T` are flattened through `MatTreeFlattener`, and converted\n * to type `F` for `MatTree` to consume.\n */\nexport class MatTreeFlatDataSource<T, F, K = F> extends DataSource<F> {\n  private readonly _flattenedData = new BehaviorSubject<F[]>([]);\n  private readonly _expandedData = new BehaviorSubject<F[]>([]);\n\n  get data() { return this._data.value; }\n  set data(value: T[]) {\n    this._data.next(value);\n    this._flattenedData.next(this._treeFlattener.flattenNodes(this.data));\n    this._treeControl.dataNodes = this._flattenedData.value;\n  }\n  private readonly _data = new BehaviorSubject<T[]>([]);\n\n  constructor(private _treeControl: FlatTreeControl<F, K>,\n              private _treeFlattener: MatTreeFlattener<T, F, K>,\n              initialData?: T[]) {\n    super();\n\n    if (initialData) {\n      // Assign the data through the constructor to ensure that all of the logic is executed.\n      this.data = initialData;\n    }\n  }\n\n  connect(collectionViewer: CollectionViewer): Observable<F[]> {\n    return merge(\n      collectionViewer.viewChange,\n      this._treeControl.expansionModel.changed,\n      this._flattenedData\n    ).pipe(map(() => {\n      this._expandedData.next(\n        this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl));\n      return this._expandedData.value;\n    }));\n  }\n\n  disconnect() {\n    // no op\n  }\n}\n"]}