data workspace extension batch 2 (#12208)

* work in progress

* load projects in view and test cases

* update scope

* make the sql proj menu available in workspace view

* add extension unit test

* address comments

* fix errors

extensions/data-workspace/src/common/workspaceTreeDataProvider.ts

@@ -0,0 +1,66 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import { IWorkspaceService, WorkspaceTreeItem as WorkspaceTreeItem } from './interfaces';
+import * as nls from 'vscode-nls';
+import { EOL } from 'os';
+const localize = nls.loadMessageBundle();
+
+/**
+ * Tree data provider for the workspace main view
+ */
+export class WorkspaceTreeDataProvider implements vscode.TreeDataProvider<WorkspaceTreeItem>{
+	constructor(private _workspaceService: IWorkspaceService) { }
+
+	private _onDidChangeTreeData: vscode.EventEmitter<void | WorkspaceTreeItem | null | undefined> | undefined = new vscode.EventEmitter<WorkspaceTreeItem | undefined | void>();
+	readonly onDidChangeTreeData?: vscode.Event<void | WorkspaceTreeItem | null | undefined> | undefined = this._onDidChangeTreeData?.event;
+
+	refresh(): void {
+		this._onDidChangeTreeData?.fire();
+	}
+
+	getTreeItem(element: WorkspaceTreeItem): vscode.TreeItem | Thenable<vscode.TreeItem> {
+		return element.treeDataProvider.getTreeItem(element.element);
+	}
+
+	async getChildren(element?: WorkspaceTreeItem | undefined): Promise<WorkspaceTreeItem[]> {
+		if (element) {
+			const items = await element.treeDataProvider.getChildren(element.element);
+			return items ? items.map(item => <WorkspaceTreeItem>{ treeDataProvider: element.treeDataProvider, element: item }) : [];
+		}
+		else {
+			// if the element is undefined return the project tree items
+			const projects = await this._workspaceService.getProjectsInWorkspace();
+			const unknownProjects: string[] = [];
+			const treeItems: WorkspaceTreeItem[] = [];
+			let project: string;
+			for (project of projects) {
+				const projectProvider = await this._workspaceService.getProjectProvider(project);
+				if (projectProvider === undefined) {
+					unknownProjects.push(project);
+					continue;
+				}
+				const treeDataProvider = await projectProvider.getProjectTreeDataProvider(project);
+				if (treeDataProvider.onDidChangeTreeData) {
+					treeDataProvider.onDidChangeTreeData((e: any) => {
+						this._onDidChangeTreeData?.fire(e);
+					});
+				}
+				const children = await treeDataProvider.getChildren(element);
+				children?.forEach(child => {
+					treeItems.push({
+						treeDataProvider: treeDataProvider,
+						element: child
+					});
+				});
+			}
+			if (unknownProjects.length > 0) {
+				vscode.window.showErrorMessage(localize('UnknownProjectsError', "No provider was found for the following projects: {0}", unknownProjects.join(EOL)));
+			}
+			return treeItems;
+		}
+	}
+}