Implement resolve classpath command

vscode-extensions/commons-vscode/src/classpath.ts

@@ -0,0 +1,31 @@
+'use strict';
+
+
+import * as VSCode from 'vscode';
+import { LanguageClient, RequestType } from 'vscode-languageclient';
+
+export function registerClasspathService(client : LanguageClient) : void {
+    let classpathRequest = new RequestType<ClasspathParams, ClasspathResponse, void, void>("sts/classpath");
+
+    client.onRequest(classpathRequest, async (params: ClasspathParams) => {
+        return await executeClasspathCommand(params.resourceUri);
+    });
+}
+
+async function executeClasspathCommand(resourceUri : string) : Promise<ClasspathResponse> {
+    return <ClasspathResponse> (await VSCode.commands.executeCommand("java.execute.workspaceCommand", "sts.java.resolveClasspath", resourceUri));
+}
+
+interface ClasspathResponse {
+    entries: ClasspathEntry[],
+    defaultOutputFolder : string
+}
+
+interface ClasspathParams {
+    resourceUri: string
+}
+
+interface ClasspathEntry {
+    kind : string,
+    path : string
+}