diff --git a/src/vs/base/common/map.ts b/src/vs/base/common/map.ts
index 19f4ce01c1d01b696ba92b03df5f6842be5e15d4..57eee9c0f10090ae6471ce6fa697611093fb89e8 100644
--- a/src/vs/base/common/map.ts
+++ b/src/vs/base/common/map.ts
@@ -5,6 +5,7 @@
 
 import { URI } from 'vs/base/common/uri';
 import { CharCode } from 'vs/base/common/charCode';
+import { compareIgnoreCase } from 'vs/base/common/strings';
 
 /**
  * @deprecated ES6: use `[...SetOrMap.values()]`
@@ -55,8 +56,8 @@ export function setToString<K>(set: Set<K>): string {
 	return `Set(${set.size}) {${entries.join(', ')}}`;
 }
 
-export interface IKeyIterator {
-	reset(key: string): this;
+export interface IKeyIterator<K> {
+	reset(key: K): this;
 	next(): this;
 
 	hasNext(): boolean;
@@ -64,7 +65,7 @@ export interface IKeyIterator {
 	value(): string;
 }
 
-export class StringIterator implements IKeyIterator {
+export class StringIterator implements IKeyIterator<string> {
 
 	private _value: string = '';
 	private _pos: number = 0;
@@ -95,7 +96,7 @@ export class StringIterator implements IKeyIterator {
 	}
 }
 
-export class PathIterator implements IKeyIterator {
+export class PathIterator implements IKeyIterator<string> {
 
 	private _value!: string;
 	private _from!: number;
@@ -162,33 +163,116 @@ export class PathIterator implements IKeyIterator {
 	}
 }
 
-class TernarySearchTreeNode<E> {
+const enum UriIteratorState {
+	Scheme = 1, Authority = 2, Path = 3, Query = 4, Fragment = 5
+}
+
+export class UriIterator implements IKeyIterator<URI> {
+
+	private _pathIterator = new PathIterator(false);
+	private _value!: URI;
+	private _states: UriIteratorState[] = [];
+	private _stateIdx: number = 0;
+
+	reset(key: URI): this {
+		this._value = key;
+		this._states = [];
+		if (this._value.scheme) {
+			this._states.push(UriIteratorState.Scheme);
+		}
+		if (this._value.authority) {
+			this._states.push(UriIteratorState.Authority);
+		}
+		if (this._value.path) {
+			this._states.push(UriIteratorState.Path);
+			this._pathIterator.reset(key.path);
+		}
+		if (this._value.query) {
+			this._states.push(UriIteratorState.Query);
+		}
+		if (this._value.fragment) {
+			this._states.push(UriIteratorState.Fragment);
+		}
+		this._stateIdx = 0;
+		return this;
+	}
+
+	next(): this {
+		if (this._states[this._stateIdx] === UriIteratorState.Path && this._pathIterator.hasNext()) {
+			this._pathIterator.next();
+		} else {
+			this._stateIdx += 1;
+		}
+		return this;
+	}
+
+	hasNext(): boolean {
+		return (this._states[this._stateIdx] === UriIteratorState.Path && this._pathIterator.hasNext())
+			|| this._stateIdx < this._states.length - 1;
+	}
+
+	cmp(a: string): number {
+		if (this._states[this._stateIdx] === UriIteratorState.Scheme) {
+			return compareIgnoreCase(a, this._value.scheme);
+		} else if (this._states[this._stateIdx] === UriIteratorState.Authority) {
+			return compareIgnoreCase(a, this._value.authority);
+		} else if (this._states[this._stateIdx] === UriIteratorState.Path) {
+			return this._pathIterator.cmp(a);
+		} else if (this._states[this._stateIdx] === UriIteratorState.Query) {
+			return compareIgnoreCase(a, this._value.scheme);
+		} else if (this._states[this._stateIdx] === UriIteratorState.Fragment) {
+			return compareIgnoreCase(a, this._value.fragment);
+		}
+		throw new Error();
+	}
+
+	value(): string {
+		if (this._states[this._stateIdx] === UriIteratorState.Scheme) {
+			return this._value.scheme;
+		} else if (this._states[this._stateIdx] === UriIteratorState.Authority) {
+			return this._value.authority;
+		} else if (this._states[this._stateIdx] === UriIteratorState.Path) {
+			return this._pathIterator.value();
+		} else if (this._states[this._stateIdx] === UriIteratorState.Query) {
+			return this._value.query;
+		} else if (this._states[this._stateIdx] === UriIteratorState.Fragment) {
+			return this._value.fragment;
+		}
+		throw new Error();
+	}
+}
+
+class TernarySearchTreeNode<K, V> {
 	segment!: string;
-	value: E | undefined;
-	key!: string;
-	left: TernarySearchTreeNode<E> | undefined;
-	mid: TernarySearchTreeNode<E> | undefined;
-	right: TernarySearchTreeNode<E> | undefined;
+	value: V | undefined;
+	key!: K;
+	left: TernarySearchTreeNode<K, V> | undefined;
+	mid: TernarySearchTreeNode<K, V> | undefined;
+	right: TernarySearchTreeNode<K, V> | undefined;
 
 	isEmpty(): boolean {
 		return !this.left && !this.mid && !this.right && !this.value;
 	}
 }
 
-export class TernarySearchTree<E> {
+export class TernarySearchTree<K, V> {
+
+	static forUris<E>(): TernarySearchTree<URI, E> {
+		return new TernarySearchTree<URI, E>(new UriIterator());
+	}
 
-	static forPaths<E>(): TernarySearchTree<E> {
-		return new TernarySearchTree<E>(new PathIterator());
+	static forPaths<E>(): TernarySearchTree<string, E> {
+		return new TernarySearchTree<string, E>(new PathIterator());
 	}
 
-	static forStrings<E>(): TernarySearchTree<E> {
-		return new TernarySearchTree<E>(new StringIterator());
+	static forStrings<E>(): TernarySearchTree<string, E> {
+		return new TernarySearchTree<string, E>(new StringIterator());
 	}
 
-	private _iter: IKeyIterator;
-	private _root: TernarySearchTreeNode<E> | undefined;
+	private _iter: IKeyIterator<K>;
+	private _root: TernarySearchTreeNode<K, V> | undefined;
 
-	constructor(segments: IKeyIterator) {
+	constructor(segments: IKeyIterator<K>) {
 		this._iter = segments;
 	}
 
@@ -196,12 +280,12 @@ export class TernarySearchTree<E> {
 		this._root = undefined;
 	}
 
-	set(key: string, element: E): E | undefined {
+	set(key: K, element: V): V | undefined {
 		const iter = this._iter.reset(key);
-		let node: TernarySearchTreeNode<E>;
+		let node: TernarySearchTreeNode<K, V>;
 
 		if (!this._root) {
-			this._root = new TernarySearchTreeNode<E>();
+			this._root = new TernarySearchTreeNode<K, V>();
 			this._root.segment = iter.value();
 		}
 
@@ -211,7 +295,7 @@ export class TernarySearchTree<E> {
 			if (val > 0) {
 				// left
 				if (!node.left) {
-					node.left = new TernarySearchTreeNode<E>();
+					node.left = new TernarySearchTreeNode<K, V>();
 					node.left.segment = iter.value();
 				}
 				node = node.left;
@@ -219,7 +303,7 @@ export class TernarySearchTree<E> {
 			} else if (val < 0) {
 				// right
 				if (!node.right) {
-					node.right = new TernarySearchTreeNode<E>();
+					node.right = new TernarySearchTreeNode<K, V>();
 					node.right.segment = iter.value();
 				}
 				node = node.right;
@@ -228,7 +312,7 @@ export class TernarySearchTree<E> {
 				// mid
 				iter.next();
 				if (!node.mid) {
-					node.mid = new TernarySearchTreeNode<E>();
+					node.mid = new TernarySearchTreeNode<K, V>();
 					node.mid.segment = iter.value();
 				}
 				node = node.mid;
@@ -242,7 +326,7 @@ export class TernarySearchTree<E> {
 		return oldElement;
 	}
 
-	get(key: string): E | undefined {
+	get(key: K): V | undefined {
 		const iter = this._iter.reset(key);
 		let node = this._root;
 		while (node) {
@@ -264,10 +348,10 @@ export class TernarySearchTree<E> {
 		return node ? node.value : undefined;
 	}
 
-	delete(key: string): void {
+	delete(key: K): void {
 
 		const iter = this._iter.reset(key);
-		const stack: [-1 | 0 | 1, TernarySearchTreeNode<E>][] = [];
+		const stack: [-1 | 0 | 1, TernarySearchTreeNode<K, V>][] = [];
 		let node = this._root;
 
 		// find and unset node
@@ -305,10 +389,10 @@ export class TernarySearchTree<E> {
 		}
 	}
 
-	findSubstr(key: string): E | undefined {
+	findSubstr(key: K): V | undefined {
 		const iter = this._iter.reset(key);
 		let node = this._root;
-		let candidate: E | undefined = undefined;
+		let candidate: V | undefined = undefined;
 		while (node) {
 			const val = iter.cmp(node.segment);
 			if (val > 0) {
@@ -329,7 +413,7 @@ export class TernarySearchTree<E> {
 		return node && node.value || candidate;
 	}
 
-	findSuperstr(key: string): Iterator<E> | undefined {
+	findSuperstr(key: K): Iterator<V> | undefined {
 		const iter = this._iter.reset(key);
 		let node = this._root;
 		while (node) {
@@ -356,11 +440,11 @@ export class TernarySearchTree<E> {
 		return undefined;
 	}
 
-	private _nodeIterator(node: TernarySearchTreeNode<E>): Iterator<E> {
-		let res: { done: false; value: E; };
+	private _nodeIterator(node: TernarySearchTreeNode<K, V>): Iterator<V> {
+		let res: { done: false; value: V; };
 		let idx: number;
-		let data: E[];
-		const next = (): IteratorResult<E> => {
+		let data: V[];
+		const next = (): IteratorResult<V> => {
 			if (!data) {
 				// lazy till first invocation
 				data = [];
@@ -381,11 +465,11 @@ export class TernarySearchTree<E> {
 		return { next };
 	}
 
-	forEach(callback: (value: E, index: string) => any) {
+	forEach(callback: (value: V, index: K) => any) {
 		this._forEach(this._root, callback);
 	}
 
-	private _forEach(node: TernarySearchTreeNode<E> | undefined, callback: (value: E, index: string) => any) {
+	private _forEach(node: TernarySearchTreeNode<K, V> | undefined, callback: (value: V, index: K) => any) {
 		if (node) {
 			// left
 			this._forEach(node.left, callback);
diff --git a/src/vs/base/common/resources.ts b/src/vs/base/common/resources.ts
index acd7ae00bfce0b932b0b25f99d9653daa12b1954..abee7da4ee0a5db5c0f376a47647878fa10eab5c 100644
--- a/src/vs/base/common/resources.ts
+++ b/src/vs/base/common/resources.ts
@@ -336,7 +336,7 @@ export namespace DataUri {
 export class ResourceGlobMatcher {
 
 	private readonly globalExpression: ParsedExpression;
-	private readonly expressionsByRoot: TernarySearchTree<{ root: URI, expression: ParsedExpression }> = TernarySearchTree.forPaths<{ root: URI, expression: ParsedExpression }>();
+	private readonly expressionsByRoot: TernarySearchTree<string, { root: URI, expression: ParsedExpression }> = TernarySearchTree.forPaths<{ root: URI, expression: ParsedExpression }>();
 
 	constructor(
 		globalExpression: IExpression,
diff --git a/src/vs/base/node/id.ts b/src/vs/base/node/id.ts
index c2faa20632fefd8bb9207b662b5442a18bcee3a1..2799ffc718da5a192675dde4cd08fbd7f6eb449f 100644
--- a/src/vs/base/node/id.ts
+++ b/src/vs/base/node/id.ts
@@ -21,7 +21,7 @@ import { getMac } from 'vs/base/node/macAddress';
 // Sun xVM VirtualBox	08-00-27
 export const virtualMachineHint: { value(): number } = new class {
 
-	private _virtualMachineOUIs?: TernarySearchTree<boolean>;
+	private _virtualMachineOUIs?: TernarySearchTree<string, boolean>;
 	private _value?: number;
 
 	private _isVirtualMachineMacAdress(mac: string): boolean {
diff --git a/src/vs/base/test/common/map.test.ts b/src/vs/base/test/common/map.test.ts
index 4ce9fbd7d1e461c7cd48136626b59bdfd618ff44..5a5c35dbd86ca229586a136d2b1ee6963a4533fe 100644
--- a/src/vs/base/test/common/map.test.ts
+++ b/src/vs/base/test/common/map.test.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { ResourceMap, TernarySearchTree, PathIterator, StringIterator, LinkedMap, Touch, LRUCache } from 'vs/base/common/map';
+import { ResourceMap, TernarySearchTree, PathIterator, StringIterator, LinkedMap, Touch, LRUCache, UriIterator } from 'vs/base/common/map';
 import * as assert from 'assert';
 import { URI } from 'vs/base/common/uri';
 
@@ -312,7 +312,64 @@ suite('Map', () => {
 		assert.equal(iter.hasNext(), false);
 	});
 
-	function assertTernarySearchTree<E>(trie: TernarySearchTree<E>, ...elements: [string, E][]) {
+	test('URIIterator', function () {
+		const iter = new UriIterator();
+		iter.reset(URI.parse('file:///usr/bin/file.txt'));
+
+		assert.equal(iter.value(), 'file');
+		assert.equal(iter.cmp('FILE'), 0);
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		assert.equal(iter.value(), 'usr');
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		assert.equal(iter.value(), 'bin');
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		assert.equal(iter.value(), 'file.txt');
+		assert.equal(iter.hasNext(), false);
+
+
+		iter.reset(URI.parse('file://share/usr/bin/file.txt?foo'));
+
+		// scheme
+		assert.equal(iter.value(), 'file');
+		assert.equal(iter.cmp('FILE'), 0);
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		// authority
+		assert.equal(iter.value(), 'share');
+		assert.equal(iter.cmp('SHARe'), 0);
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		// path
+		assert.equal(iter.value(), 'usr');
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		// path
+		assert.equal(iter.value(), 'bin');
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		// path
+		assert.equal(iter.value(), 'file.txt');
+		assert.equal(iter.hasNext(), true);
+		iter.next();
+
+		// query
+		assert.equal(iter.value(), 'foo');
+		assert.equal(iter.cmp('z') > 0, true);
+		assert.equal(iter.cmp('a') < 0, true);
+		assert.equal(iter.hasNext(), false);
+	});
+
+	function assertTernarySearchTree<E>(trie: TernarySearchTree<string, E>, ...elements: [string, E][]) {
 		const map = new Map<string, E>();
 		for (const [key, value] of elements) {
 			map.set(key, value);
@@ -378,7 +435,7 @@ suite('Map', () => {
 	});
 
 	test('TernarySearchTree - basics', function () {
-		let trie = new TernarySearchTree<number>(new StringIterator());
+		let trie = new TernarySearchTree<string, number>(new StringIterator());
 
 		trie.set('foo', 1);
 		trie.set('bar', 2);
@@ -408,7 +465,7 @@ suite('Map', () => {
 	});
 
 	test('TernarySearchTree - delete & cleanup', function () {
-		let trie = new TernarySearchTree<number>(new StringIterator());
+		let trie = new TernarySearchTree<string, number>(new StringIterator());
 		trie.set('foo', 1);
 		trie.set('foobar', 2);
 		trie.set('bar', 3);
@@ -418,7 +475,7 @@ suite('Map', () => {
 	});
 
 	test('TernarySearchTree (PathSegments) - basics', function () {
-		let trie = new TernarySearchTree<number>(new PathIterator());
+		let trie = new TernarySearchTree<string, number>(new PathIterator());
 
 		trie.set('/user/foo/bar', 1);
 		trie.set('/user/foo', 2);
@@ -442,7 +499,7 @@ suite('Map', () => {
 
 	test('TernarySearchTree (PathSegments) - lookup', function () {
 
-		const map = new TernarySearchTree<number>(new PathIterator());
+		const map = new TernarySearchTree<string, number>(new PathIterator());
 		map.set('/user/foo/bar', 1);
 		map.set('/user/foo', 2);
 		map.set('/user/foo/flip/flop', 3);
@@ -456,7 +513,7 @@ suite('Map', () => {
 
 	test('TernarySearchTree (PathSegments) - superstr', function () {
 
-		const map = new TernarySearchTree<number>(new PathIterator());
+		const map = new TernarySearchTree<string, number>(new PathIterator());
 		map.set('/user/foo/bar', 1);
 		map.set('/user/foo', 2);
 		map.set('/user/foo/flip/flop', 3);
diff --git a/src/vs/platform/configuration/test/common/testConfigurationService.ts b/src/vs/platform/configuration/test/common/testConfigurationService.ts
index 01b942cf531cdd6c2f5f6814f096aeb7e409e345..c8e4cfd5ddef801d5bac7de15f0f5a87811522ad 100644
--- a/src/vs/platform/configuration/test/common/testConfigurationService.ts
+++ b/src/vs/platform/configuration/test/common/testConfigurationService.ts
@@ -18,7 +18,7 @@ export class TestConfigurationService implements IConfigurationService {
 		this.configuration = configuration || Object.create(null);
 	}
 
-	private configurationByRoot: TernarySearchTree<any> = TernarySearchTree.forPaths<any>();
+	private configurationByRoot: TernarySearchTree<string, any> = TernarySearchTree.forPaths<any>();
 
 	public reloadConfiguration<T>(): Promise<T> {
 		return Promise.resolve(this.getValue());
diff --git a/src/vs/platform/files/common/fileService.ts b/src/vs/platform/files/common/fileService.ts
index 5ab93b98fd43a005af00b7ced80c57f9dc171a66..748fb25f2b963849c67e897d96c583f728f804ce 100644
--- a/src/vs/platform/files/common/fileService.ts
+++ b/src/vs/platform/files/common/fileService.ts
@@ -182,7 +182,7 @@ export class FileService extends Disposable implements IFileService {
 
 		const stat = await provider.stat(resource);
 
-		let trie: TernarySearchTree<boolean> | undefined;
+		let trie: TernarySearchTree<string, boolean> | undefined;
 
 		return this.toFileStat(provider, resource, stat, undefined, !!resolveMetadata, (stat, siblings) => {
 
diff --git a/src/vs/platform/workspace/common/workspace.ts b/src/vs/platform/workspace/common/workspace.ts
index b10c023d005b946e9273504722f8ce8eca616af9..e26297f34451c51d4c3a4c2b03827c4c14de48f1 100644
--- a/src/vs/platform/workspace/common/workspace.ts
+++ b/src/vs/platform/workspace/common/workspace.ts
@@ -144,7 +144,7 @@ export interface IWorkspaceFolder extends IWorkspaceFolderData {
 
 export class Workspace implements IWorkspace {
 
-	private _foldersMap: TernarySearchTree<WorkspaceFolder> = TernarySearchTree.forPaths<WorkspaceFolder>();
+	private _foldersMap: TernarySearchTree<string, WorkspaceFolder> = TernarySearchTree.forPaths<WorkspaceFolder>();
 	private _folders!: WorkspaceFolder[];
 
 	constructor(
diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
index 904c5afd8c8e6d54d336c8e3b9873c792a167b4b..741a5b73800642d5bd66da1007566a69c7e3c0e5 100644
--- a/src/vs/workbench/api/common/extHostExtensionService.ts
+++ b/src/vs/workbench/api/common/extHostExtensionService.ts
@@ -90,7 +90,7 @@ export abstract class AbstractExtHostExtensionService implements ExtHostExtensio
 	private readonly _storage: ExtHostStorage;
 	private readonly _storagePath: IExtensionStoragePaths;
 	private readonly _activator: ExtensionsActivator;
-	private _extensionPathIndex: Promise<TernarySearchTree<IExtensionDescription>> | null;
+	private _extensionPathIndex: Promise<TernarySearchTree<string, IExtensionDescription>> | null;
 
 	private readonly _resolvers: { [authorityPrefix: string]: vscode.RemoteAuthorityResolver; };
 
@@ -236,7 +236,7 @@ export abstract class AbstractExtHostExtensionService implements ExtHostExtensio
 	}
 
 	// create trie to enable fast 'filename -> extension id' look up
-	public getExtensionPathIndex(): Promise<TernarySearchTree<IExtensionDescription>> {
+	public getExtensionPathIndex(): Promise<TernarySearchTree<string, IExtensionDescription>> {
 		if (!this._extensionPathIndex) {
 			const tree = TernarySearchTree.forPaths<IExtensionDescription>();
 			const extensions = this._registry.getAllExtensionDescriptions().map(ext => {
@@ -792,6 +792,6 @@ export interface IExtHostExtensionService extends AbstractExtHostExtensionServic
 	deactivateAll(): Promise<void>;
 	getExtensionExports(extensionId: ExtensionIdentifier): IExtensionAPI | null | undefined;
 	getExtensionRegistry(): Promise<ExtensionDescriptionRegistry>;
-	getExtensionPathIndex(): Promise<TernarySearchTree<IExtensionDescription>>;
+	getExtensionPathIndex(): Promise<TernarySearchTree<string, IExtensionDescription>>;
 	registerRemoteAuthorityResolver(authorityPrefix: string, resolver: vscode.RemoteAuthorityResolver): vscode.Disposable;
 }
diff --git a/src/vs/workbench/api/common/extHostRequireInterceptor.ts b/src/vs/workbench/api/common/extHostRequireInterceptor.ts
index c06e86c83051c9a92fe0ba7cb34fc0be71fbe3fa..97839338566cff584a4e2c08814cef658d43f464 100644
--- a/src/vs/workbench/api/common/extHostRequireInterceptor.ts
+++ b/src/vs/workbench/api/common/extHostRequireInterceptor.ts
@@ -91,7 +91,7 @@ class VSCodeNodeModuleFactory implements INodeModuleFactory {
 
 	constructor(
 		private readonly _apiFactory: IExtensionApiFactory,
-		private readonly _extensionPaths: TernarySearchTree<IExtensionDescription>,
+		private readonly _extensionPaths: TernarySearchTree<string, IExtensionDescription>,
 		private readonly _extensionRegistry: ExtensionDescriptionRegistry,
 		private readonly _configProvider: ExtHostConfigProvider,
 		private readonly _logService: ILogService,
@@ -230,7 +230,7 @@ class OpenNodeModuleFactory implements INodeModuleFactory {
 	private _mainThreadTelemetry: MainThreadTelemetryShape;
 
 	constructor(
-		private readonly _extensionPaths: TernarySearchTree<IExtensionDescription>,
+		private readonly _extensionPaths: TernarySearchTree<string, IExtensionDescription>,
 		private readonly _appUriScheme: string,
 		@IExtHostRpcService rpcService: IExtHostRpcService,
 	) {
diff --git a/src/vs/workbench/contrib/search/common/searchModel.ts b/src/vs/workbench/contrib/search/common/searchModel.ts
index ca24d175027d403a71aff3a898927ff47858a171..4a7837976ca21b595365756cd34ced1e39da5f2a 100644
--- a/src/vs/workbench/contrib/search/common/searchModel.ts
+++ b/src/vs/workbench/contrib/search/common/searchModel.ts
@@ -696,7 +696,7 @@ export class SearchResult extends Disposable {
 
 	private _folderMatches: FolderMatchWithResource[] = [];
 	private _otherFilesMatch: FolderMatch | null = null;
-	private _folderMatchesMap: TernarySearchTree<FolderMatchWithResource> = TernarySearchTree.forPaths<FolderMatchWithResource>();
+	private _folderMatchesMap: TernarySearchTree<string, FolderMatchWithResource> = TernarySearchTree.forPaths<FolderMatchWithResource>();
 	private _showHighlights: boolean = false;
 	private _query: ITextQuery | null = null;