Office hierarchy view as tree

src/app/organization/offices/office-tree-service.service.ts

@@ -0,0 +1,81 @@
+/** Angular Imports */
+import { Injectable } from '@angular/core';
+
+/** rxjs Imports */
+import { BehaviorSubject } from 'rxjs';
+
+/** Custom Components */
+import { OfficeNode } from './office-node.model';
+
+/**
+ * Office tree service.
+ */
+@Injectable({
+  providedIn: 'root'
+})
+export class OfficeTreeService {
+
+  /** Office data. */
+  officesData: any;
+  /** Offices tree data behavior subject to represent offices tree nodes. */
+  treeDataChange = new BehaviorSubject<OfficeNode[]>([]);
+
+  /**
+   * Gets the offices tree nodes.
+   */
+  get treeData(): OfficeNode[] { return this.treeDataChange.value; }
+
+  constructor() {  }
+
+  /**
+   * Builds the offices tree and emits the value.
+   * @param {any} officesData Offices data.
+   */
+  initialize(officesData: any) {
+    const treeData = this.buildOfficeTree(officesData);
+    this.treeDataChange.next(treeData);
+  }
+
+  /**
+   * Builds and returns the offices tree.
+   * @param {any} officeData Offices data.
+   * @returns {OfficeNode} Offices tree nodes.
+   */
+  buildOfficeTree(officesData: any): OfficeNode[] {
+    const officeTree: OfficeNode[] = [];
+
+    // Header nodes
+    const mainOffice = officesData.find((office: any) => office.hierarchy === '.');
+    officeTree.push(new OfficeNode(mainOffice.name, mainOffice.id));
+
+    // Sort by parent id (so that child nodes can be added properly)
+    officesData.sort((officeOne: any, officeTwo: any) => {
+      if (!officeOne.parentId) {
+        officeOne.parentId = 0;
+      }
+      return officeOne.parentId - officeTwo.parentId;
+    });
+
+    const offices: OfficeNode[] = [];
+
+    // Add offices to any array where index for each is denoted by its id
+    for (const office of officesData) {
+      offices[office.id] =
+        new OfficeNode(office.name, office.id, office.parentId, office.hierarchy, office.externalId, office.parentName, office.openingDate);
+    }
+
+    // Construct offices tree by adding all nodes belonging to headers (with parent id = 0),
+    // and rest as children to respective parent nodes.
+    for (const office of officesData) {
+      if (office.hierarchy !== '.') {
+        if (office.parentId === 1) {
+          officeTree[0].children.push(offices[office.id]);
+        } else {
+          offices[office.parentId].children.push(offices[office.id]);
+        }
+      }
+    }
+    return officeTree;
+  }
+
+}