SDK implementations based on file_system rather than java_io

pkg/analyzer/lib/src/dart/sdk/sdk.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library analyzer.src.generated.sdk_io;
+library analyzer.src.generated.sdk2;
 
 import 'dart:collection';
-import 'dart:io';
+import 'dart:io' as io;
 
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/java_engine_io.dart';
-import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/idl.dart' show PackageBundle;
 import 'package:analyzer/src/summary/summary_sdk.dart';
 import 'package:path/path.dart' as pathos;
+import 'package:yaml/yaml.dart';
 
 /**
  * An abstract implementation of a Dart SDK in which the available libraries are
  * stored in a library map. Subclasses are responsible for populating the
  * library map.
  */
 abstract class AbstractDartSdk implements DartSdk {
   /**
+   * The resource provider used to access the file system.
+   */
+  ResourceProvider resourceProvider;
+
+  /**
    * A mapping from Dart library URI's to the library represented by that URI.
    */
   LibraryMap libraryMap = new LibraryMap();
 
   /**
    * The [AnalysisOptions] to use to create the [context].
    */
   AnalysisOptions _analysisOptions;
 
   /**
@@ skipping 57 matching lines @@
    * Specify whether SDK summary should be used.
    */
   void set useSummary(bool use) {
     if (_analysisContext != null) {
       throw new StateError(
           'The "useSummary" flag cannot be changed after context creation.');
     }
     _useSummary = use;
   }
 
-  /**
-   * Add the extensions from one or more sdk extension files to this sdk. The
-   * [extensions] should be a table mapping the names of extensions to the paths
-   * where those extensions can be found.
-   */
-  void addExtensions(Map<String, String> extensions) {
-    extensions.forEach((String uri, String path) {
-      String shortName = uri.substring(uri.indexOf(':') + 1);
-      SdkLibraryImpl library = new SdkLibraryImpl(shortName);
-      library.path = path;
-      libraryMap.setLibrary(uri, library);
-    });
-  }
-
   @override
   Source fromFileUri(Uri uri) {
-    JavaFile file = new JavaFile.fromUri(uri);
+    File file = resourceProvider.getFile(uri.toFilePath(windows: false));
 
     String path = _getPath(file);
     if (path == null) {
       return null;
     }
     try {
-      return new FileBasedSource(file, parseUriWithException(path));
+      return file.createSource(parseUriWithException(path));
     } on URISyntaxException catch (exception, stackTrace) {
       AnalysisEngine.instance.logger.logInformation(
           "Failed to create URI: $path",
           new CaughtException(exception, stackTrace));
     }
     return null;
   }
 
-  String getRelativePathFromFile(JavaFile file);
+  String getRelativePathFromFile(File file);
 
   @override
   SdkLibrary getSdkLibrary(String dartUri) => libraryMap.getLibrary(dartUri);
 
   /**
    * Return the [PackageBundle] for this SDK, if it exists, or `null` otherwise.
    * This method should not be used outside of `analyzer` and `analyzer_cli`
    * packages.
    */
   PackageBundle getSummarySdkBundle(bool strongMode);
 
-  FileBasedSource internalMapDartUri(String dartUri) {
+  Source internalMapDartUri(String dartUri) {
     // TODO(brianwilkerson) Figure out how to unify the implementations in the
     // two subclasses.
     String libraryName;
     String relativePath;
     int index = dartUri.indexOf('/');
     if (index >= 0) {
       libraryName = dartUri.substring(0, index);
       relativePath = dartUri.substring(index + 1);
     } else {
       libraryName = dartUri;
       relativePath = "";
     }
     SdkLibrary library = getSdkLibrary(libraryName);
     if (library == null) {
       return null;
     }
     String srcPath;
     if (relativePath.isEmpty) {
       srcPath = library.path;
     } else {
       String libraryPath = library.path;
-      int index = libraryPath.lastIndexOf(JavaFile.separator);
+      int index = libraryPath.lastIndexOf(pathos.separator);

[scheglov, 2016/08/03 15:54:52]

Do we have tests for this code?
I was not able to find them for AbstractSdk in sdk_io.

I think we should use resourceProvider.pathContext.separator here.

[Brian Wilkerson, 2016/08/03 17:16:10]

No. This method is overridden by both of the subclasses, so it can't be
executed. Perhaps I should just make it an abstract class (except for the TODO).
Done, here and elsewhere.

       if (index == -1) {
         index = libraryPath.lastIndexOf('/');
         if (index == -1) {
           return null;
         }
       }
       String prefix = libraryPath.substring(0, index + 1);
       srcPath = '$prefix$relativePath';
     }
-    String filePath = srcPath.replaceAll('/', JavaFile.separator);
+    String filePath = srcPath.replaceAll('/', pathos.separator);
     try {
-      JavaFile file = new JavaFile(filePath);
-      return new FileBasedSource(file, parseUriWithException(dartUri));
+      File file = resourceProvider.getFile(filePath);
+      return file.createSource(parseUriWithException(dartUri));
     } on URISyntaxException {
       return null;
     }
   }
 
   @override
   Source mapDartUri(String dartUri) {
     Source source = _uriToSourceMap[dartUri];
     if (source == null) {
       source = internalMapDartUri(dartUri);
       _uriToSourceMap[dartUri] = source;
     }
     return source;
   }
 
-  String _getPath(JavaFile file) {
+  String _getPath(File file) {
     List<SdkLibrary> libraries = libraryMap.sdkLibraries;
     int length = libraries.length;
     List<String> paths = new List(length);
     String filePath = getRelativePathFromFile(file);
     if (filePath == null) {
       return null;
     }
     for (int i = 0; i < length; i++) {
       SdkLibrary library = libraries[i];
-      String libraryPath = library.path.replaceAll('/', JavaFile.separator);
+      String libraryPath = library.path.replaceAll('/', pathos.separator);
       if (filePath == libraryPath) {
         return library.shortName;
       }
       paths[i] = libraryPath;
     }
     for (int i = 0; i < length; i++) {
       SdkLibrary library = libraries[i];
       String libraryPath = paths[i];
-      int index = libraryPath.lastIndexOf(JavaFile.separator);
+      int index = libraryPath.lastIndexOf(pathos.separator);
       if (index >= 0) {
         String prefix = libraryPath.substring(0, index + 1);
         if (filePath.startsWith(prefix)) {
           String relPath = filePath
               .substring(prefix.length)
-              .replaceAll(JavaFile.separator, '/');
+              .replaceAll(pathos.separator, '/');
           return '${library.shortName}/$relPath';
         }
       }
     }
     return null;
   }
 }
 
 /**
+ * An SDK backed by URI mappings derived from an `_embedder.yaml` file.
+ */
+class EmbedderSdk extends AbstractDartSdk {
+  static const String _DART_COLON_PREFIX = 'dart:';
+
+  static const String _EMBEDDED_LIB_MAP_KEY = 'embedded_libs';
+  final Map<String, String> _urlMappings = new HashMap<String, String>();
+
+  EmbedderSdk(
+      ResourceProvider resourceProvider, Map<Folder, YamlMap> embedderYamls) {
+    this.resourceProvider = resourceProvider;
+    embedderYamls?.forEach(_processEmbedderYaml);
+  }
+
+  @override
+  // TODO(danrubel) Determine SDK version
+  String get sdkVersion => '0';
+
+  /**
+   * The url mappings for this SDK.
+   */
+  Map<String, String> get urlMappings => _urlMappings;
+
+  @override
+  String getRelativePathFromFile(File file) => file.path;
+
+  @override
+  PackageBundle getSummarySdkBundle(bool strongMode) => null;
+
+  @override
+  Source internalMapDartUri(String dartUri) {
+    String libraryName;
+    String relativePath;
+    int index = dartUri.indexOf('/');
+    if (index >= 0) {
+      libraryName = dartUri.substring(0, index);
+      relativePath = dartUri.substring(index + 1);
+    } else {
+      libraryName = dartUri;
+      relativePath = "";
+    }
+    SdkLibrary library = getSdkLibrary(libraryName);
+    if (library == null) {
+      return null;
+    }
+    String srcPath;
+    if (relativePath.isEmpty) {
+      srcPath = library.path;
+    } else {
+      String libraryPath = library.path;
+      int index = libraryPath.lastIndexOf(pathos.separator);
+      if (index == -1) {
+        index = libraryPath.lastIndexOf('/');
+        if (index == -1) {
+          return null;
+        }
+      }
+      String prefix = libraryPath.substring(0, index + 1);
+      srcPath = '$prefix$relativePath';
+    }
+    String filePath = srcPath.replaceAll('/', pathos.separator);
+    try {
+      File file = resourceProvider.getFile(filePath);
+      return file.createSource(parseUriWithException(dartUri));
+    } on URISyntaxException {
+      return null;
+    }
+  }
+
+  /**
+   * Install the mapping from [name] to [libDir]/[file].
+   */
+  void _processEmbeddedLibs(String name, String file, Folder libDir) {
+    if (!name.startsWith(_DART_COLON_PREFIX)) {
+      // SDK libraries must begin with 'dart:'.
+      return;
+    }
+    String libPath = libDir.canonicalizePath(file);
+    _urlMappings[name] = libPath;
+    SdkLibraryImpl library = new SdkLibraryImpl(name);
+    library.path = libPath;
+    libraryMap.setLibrary(name, library);
+  }
+
+  /**
+   * Given the 'embedderYamls' from [EmbedderYamlLocator] check each one for the
+   * top level key 'embedded_libs'. Under the 'embedded_libs' key are key value
+   * pairs. Each key is a 'dart:' library uri and each value is a path
+   * (relative to the directory containing `_embedder.yaml`) to a dart script
+   * for the given library. For example:
+   *
+   * embedded_libs:
+   *   'dart:io': '../../sdk/io/io.dart'
+   *
+   * If a key doesn't begin with `dart:` it is ignored.
+   */
+  void _processEmbedderYaml(Folder libDir, YamlMap map) {
+    YamlNode embedded_libs = map[_EMBEDDED_LIB_MAP_KEY];
+    if (embedded_libs is YamlMap) {
+      embedded_libs.forEach((k, v) => _processEmbeddedLibs(k, v, libDir));
+    }
+  }
+}
+
+/**
  * A Dart SDK installed in a specified directory. Typical Dart SDK layout is
  * something like...
  *
  *     dart-sdk/
  *        bin/
  *           dart[.exe]  <-- VM
  *        lib/
  *           core/
  *              core.dart
  *              ... other core library files ...
  *           ... other libraries ...
  *        util/
  *           ... Dart utilities ...
  *     Chromium/   <-- Dartium typically exists in a sibling directory
  */
-class DirectoryBasedDartSdk extends AbstractDartSdk {
-  /**
-   * The default SDK, or `null` if the default SDK either has not yet been
-   * created or cannot be created for some reason.
-   */
-  static DirectoryBasedDartSdk _DEFAULT_SDK;
-
+class FolderBasedDartSdk extends AbstractDartSdk {
   /**
    * The name of the directory within the SDK directory that contains
    * executables.
    */
   static String _BIN_DIRECTORY_NAME = "bin";
 
-  /**
-   * The name of the directory on non-Mac that contains dartium.
-   */
-  static String _DARTIUM_DIRECTORY_NAME = "chromium";
-
-  /**
-   * The name of the dart2js executable on non-windows operating systems.
-   */
-  static String _DART2JS_EXECUTABLE_NAME = "dart2js";
-
-  /**
-   * The name of the file containing the dart2js executable on Windows.
-   */
-  static String _DART2JS_EXECUTABLE_NAME_WIN = "dart2js.bat";
-
-  /**
-   * The name of the file containing the Dartium executable on Linux.
-   */
-  static String _DARTIUM_EXECUTABLE_NAME_LINUX = "chrome";
-
-  /**
-   * The name of the file containing the Dartium executable on Macintosh.
-   */
-  static String _DARTIUM_EXECUTABLE_NAME_MAC =
-      "Chromium.app/Contents/MacOS/Chromium";
-
-  /**
-   * The name of the file containing the Dartium executable on Windows.
-   */
-  static String _DARTIUM_EXECUTABLE_NAME_WIN = "Chrome.exe";
-
-  /**
-   * The name of the [System] property whose value is the path to the default
-   * Dart SDK directory.
-   */
-  static String _DEFAULT_DIRECTORY_PROPERTY_NAME = "com.google.dart.sdk";
+//  /**
+//   * The name of the directory on non-Mac that contains dartium.
+//   */
+//  static String _DARTIUM_DIRECTORY_NAME = "chromium";
+//
+//  /**
+//   * The name of the dart2js executable on non-windows operating systems.
+//   */
+//  static String _DART2JS_EXECUTABLE_NAME = "dart2js";
+//
+//  /**
+//   * The name of the file containing the dart2js executable on Windows.
+//   */
+//  static String _DART2JS_EXECUTABLE_NAME_WIN = "dart2js.bat";
+//
+//  /**
+//   * The name of the file containing the Dartium executable on Linux.
+//   */
+//  static String _DARTIUM_EXECUTABLE_NAME_LINUX = "chrome";
+//
+//  /**
+//   * The name of the file containing the Dartium executable on Macintosh.
+//   */
+//  static String _DARTIUM_EXECUTABLE_NAME_MAC =
+//      "Chromium.app/Contents/MacOS/Chromium";
+//
+//  /**
+//   * The name of the file containing the Dartium executable on Windows.
+//   */
+//  static String _DARTIUM_EXECUTABLE_NAME_WIN = "Chrome.exe";
+//
+//  /**
+//   * The name of the [System] property whose value is the path to the default
+//   * Dart SDK directory.
+//   */
+//  static String _DEFAULT_DIRECTORY_PROPERTY_NAME = "com.google.dart.sdk";

[scheglov, 2016/08/03 15:54:52]

Did you want to remove this code, or you will need it for the next steps?

[Brian Wilkerson, 2016/08/03 17:16:10]

I think I can remove it because I think that I can get it back if I need it.
Done.

 
   /**
    * The name of the directory within the SDK directory that contains
    * documentation for the libraries.
    */
   static String _DOCS_DIRECTORY_NAME = "docs";
 
-  /**
-   * The suffix added to the name of a library to derive the name of the file
-   * containing the documentation for that library.
-   */
-  static String _DOC_FILE_SUFFIX = "_api.json";
+//  /**
+//   * The suffix added to the name of a library to derive the name of the file
+//   * containing the documentation for that library.
+//   */
+//  static String _DOC_FILE_SUFFIX = "_api.json";
 
   /**
    * The name of the directory within the SDK directory that contains the
    * sdk_library_metadata directory.
    */
   static String _INTERNAL_DIR = "_internal";
 
   /**
    * The name of the sdk_library_metadata directory that contains the package
    * holding the libraries.dart file.
@@ skipping 26 matching lines @@
    * The name of the pub executable on non-windows operating systems.
    */
   static String _PUB_EXECUTABLE_NAME = "pub";
 
   /**
    * The name of the file within the SDK directory that contains the version
    * number of the SDK.
    */
   static String _VERSION_FILE_NAME = "version";
 
-  /**
-   * The name of the file containing the VM executable on the Windows operating
-   * system.
-   */
-  static String _VM_EXECUTABLE_NAME_WIN = "dart.exe";
-
-  /**
-   * The name of the file containing the VM executable on non-Windows operating
-   * systems.
-   */
-  static String _VM_EXECUTABLE_NAME = "dart";
-
-  /**
-   * Return the default Dart SDK, or `null` if the directory containing the
-   * default SDK cannot be determined (or does not exist).
-   */
-  static DirectoryBasedDartSdk get defaultSdk {
-    if (_DEFAULT_SDK == null) {
-      JavaFile sdkDirectory = defaultSdkDirectory;
-      if (sdkDirectory == null) {
-        return null;
-      }
-      _DEFAULT_SDK = new DirectoryBasedDartSdk(sdkDirectory);
-    }
-    return _DEFAULT_SDK;
-  }
-
-  /**
-   * Return the default directory for the Dart SDK, or `null` if the directory
-   * cannot be determined (or does not exist). The default directory is provided
-   * by a system property named `com.google.dart.sdk`.
-   */
-  static JavaFile get defaultSdkDirectory {
-    String sdkProperty =
-        JavaSystemIO.getProperty(_DEFAULT_DIRECTORY_PROPERTY_NAME);
-    if (sdkProperty == null) {
-      return null;
-    }
-    JavaFile sdkDirectory = new JavaFile(sdkProperty);
-    if (!sdkDirectory.exists()) {
-      return null;
-    }
-    return sdkDirectory;
-  }
+//  /**
+//   * The name of the file containing the VM executable on the Windows operating
+//   * system.
+//   */
+//  static String _VM_EXECUTABLE_NAME_WIN = "dart.exe";
+//
+//  /**
+//   * The name of the file containing the VM executable on non-Windows operating
+//   * systems.
+//   */
+//  static String _VM_EXECUTABLE_NAME = "dart";
 
   /**
    * The directory containing the SDK.
    */
-  JavaFile _sdkDirectory;
+  Folder _sdkDirectory;
 
   /**
    * The directory within the SDK directory that contains the libraries.
    */
-  JavaFile _libraryDirectory;
+  Folder _libraryDirectory;
 
   /**
    * The revision number of this SDK, or `"0"` if the revision number cannot be
    * discovered.
    */
   String _sdkVersion;
 
-  /**
-   * The file containing the dart2js executable.
-   */
-  JavaFile _dart2jsExecutable;
-
-  /**
-   * The file containing the Dartium executable.
-   */
-  JavaFile _dartiumExecutable;
+//  /**
+//   * The file containing the dart2js executable.
+//   */
+//  File _dart2jsExecutable;
+//
+//  /**
+//   * The file containing the Dartium executable.
+//   */
+//  File _dartiumExecutable;
 
   /**
    * The file containing the pub executable.
    */
-  JavaFile _pubExecutable;
+  File _pubExecutable;
 
-  /**
-   * The file containing the VM executable.
-   */
-  JavaFile _vmExecutable;
+//  /**
+//   * The file containing the VM executable.
+//   */
+//  File _vmExecutable;
 
   /**
    * Initialize a newly created SDK to represent the Dart SDK installed in the
    * [sdkDirectory]. The flag [useDart2jsPaths] is `true` if the dart2js path
    * should be used when it is available
    */
-  DirectoryBasedDartSdk(JavaFile sdkDirectory, [bool useDart2jsPaths = false]) {
-    this._sdkDirectory = sdkDirectory.getAbsoluteFile();
+  FolderBasedDartSdk(ResourceProvider resourceProvider, this._sdkDirectory,
+      [bool useDart2jsPaths = false]) {
+    this.resourceProvider = resourceProvider;
     libraryMap = initialLibraryMap(useDart2jsPaths);
   }
 
-  /**
-   * Return the file containing the dart2js executable, or `null` if it does not
-   * exist.
-   */
-  JavaFile get dart2JsExecutable {
-    if (_dart2jsExecutable == null) {
-      _dart2jsExecutable = _verifyExecutable(new JavaFile.relative(
-          new JavaFile.relative(_sdkDirectory, _BIN_DIRECTORY_NAME),
-          OSUtilities.isWindows()
-              ? _DART2JS_EXECUTABLE_NAME_WIN
-              : _DART2JS_EXECUTABLE_NAME));
-    }
-    return _dart2jsExecutable;
-  }
-
-  /**
-   * Return the name of the file containing the Dartium executable.
-   */
-  String get dartiumBinaryName {
-    if (OSUtilities.isWindows()) {
-      return _DARTIUM_EXECUTABLE_NAME_WIN;
-    } else if (OSUtilities.isMac()) {
-      return _DARTIUM_EXECUTABLE_NAME_MAC;
-    } else {
-      return _DARTIUM_EXECUTABLE_NAME_LINUX;
-    }
-  }
-
-  /**
-   * Return the file containing the Dartium executable, or `null` if it does not
-   * exist.
-   */
-  JavaFile get dartiumExecutable {
-    if (_dartiumExecutable == null) {
-      _dartiumExecutable = _verifyExecutable(
-          new JavaFile.relative(dartiumWorkingDirectory, dartiumBinaryName));
-    }
-    return _dartiumExecutable;
-  }
-
-  /**
-   * Return the directory where dartium can be found (the directory that will be
-   * the working directory is Dartium is invoked without changing the default).
-   */
-  JavaFile get dartiumWorkingDirectory =>
-      getDartiumWorkingDirectory(_sdkDirectory.getParentFile());
+//  /**
+//   * Return the file containing the dart2js executable, or `null` if it does not
+//   * exist.
+//   */
+//  File get dart2JsExecutable {
+//    if (_dart2jsExecutable == null) {
+//      _dart2jsExecutable = _verifyExecutable(_sdkDirectory
+//          .getChildAssumingFolder(_BIN_DIRECTORY_NAME)
+//          .getChildAssumingFile(OSUtilities.isWindows()
+//              ? _DART2JS_EXECUTABLE_NAME_WIN
+//              : _DART2JS_EXECUTABLE_NAME));
+//    }
+//    return _dart2jsExecutable;
+//  }
+//
+//  /**
+//   * Return the name of the file containing the Dartium executable.
+//   */
+//  String get dartiumBinaryName {
+//    if (OSUtilities.isWindows()) {
+//      return _DARTIUM_EXECUTABLE_NAME_WIN;
+//    } else if (OSUtilities.isMac()) {
+//      return _DARTIUM_EXECUTABLE_NAME_MAC;
+//    } else {
+//      return _DARTIUM_EXECUTABLE_NAME_LINUX;
+//    }
+//  }
+//
+//  /**
+//   * Return the file containing the Dartium executable, or `null` if it does not
+//   * exist.
+//   */
+//  File get dartiumExecutable {
+//    if (_dartiumExecutable == null) {
+//      _dartiumExecutable = _verifyExecutable(
+//          dartiumWorkingDirectory.getChildAssumingFile(dartiumBinaryName));
+//    }
+//    return _dartiumExecutable;
+//  }
+//
+//  /**
+//   * Return the directory where dartium can be found (the directory that will be
+//   * the working directory is Dartium is invoked without changing the default).
+//   */
+//  Folder get dartiumWorkingDirectory =>
+//      getDartiumWorkingDirectory(_sdkDirectory.parent);
 
   /**
    * Return the directory containing the SDK.
    */
-  JavaFile get directory => _sdkDirectory;
+  Folder get directory => _sdkDirectory;
 
   /**
    * Return the directory containing documentation for the SDK.
    */
-  JavaFile get docDirectory =>
-      new JavaFile.relative(_sdkDirectory, _DOCS_DIRECTORY_NAME);
+  Folder get docDirectory =>
+      _sdkDirectory.getChildAssumingFolder(_DOCS_DIRECTORY_NAME);
 
-  /**
-   * Return `true` if this SDK includes documentation.
-   */
-  bool get hasDocumentation => docDirectory.exists();
-
-  /**
-   * Return `true` if the Dartium binary is available.
-   */
-  bool get isDartiumInstalled => dartiumExecutable != null;
+//  /**
+//   * Return `true` if this SDK includes documentation.
+//   */
+//  bool get hasDocumentation => docDirectory.exists;
+//
+//  /**
+//   * Return `true` if the Dartium binary is available.
+//   */
+//  bool get isDartiumInstalled => dartiumExecutable != null;
 
   /**
    * Return the directory within the SDK directory that contains the libraries.
    */
-  JavaFile get libraryDirectory {
+  Folder get libraryDirectory {
     if (_libraryDirectory == null) {
       _libraryDirectory =
-          new JavaFile.relative(_sdkDirectory, _LIB_DIRECTORY_NAME);
+          _sdkDirectory.getChildAssumingFolder(_LIB_DIRECTORY_NAME);
     }
     return _libraryDirectory;
   }
 
   /**
    * Return the file containing the Pub executable, or `null` if it does not exist.
    */
-  JavaFile get pubExecutable {
+  File get pubExecutable {
     if (_pubExecutable == null) {
-      _pubExecutable = _verifyExecutable(new JavaFile.relative(
-          new JavaFile.relative(_sdkDirectory, _BIN_DIRECTORY_NAME),
-          OSUtilities.isWindows()
+      _pubExecutable = _sdkDirectory
+          .getChildAssumingFolder(_BIN_DIRECTORY_NAME)
+          .getChildAssumingFile(OSUtilities.isWindows()
               ? _PUB_EXECUTABLE_NAME_WIN
-              : _PUB_EXECUTABLE_NAME));
+              : _PUB_EXECUTABLE_NAME);
     }
     return _pubExecutable;
   }
 
   /**
    * Return the revision number of this SDK, or `"0"` if the revision number
    * cannot be discovered.
    */
   @override
   String get sdkVersion {
     if (_sdkVersion == null) {
       _sdkVersion = DartSdk.DEFAULT_VERSION;
-      JavaFile revisionFile =
-          new JavaFile.relative(_sdkDirectory, _VERSION_FILE_NAME);
+      File revisionFile =
+          _sdkDirectory.getChildAssumingFile(_VERSION_FILE_NAME);
       try {
         String revision = revisionFile.readAsStringSync();
         if (revision != null) {
           _sdkVersion = revision.trim();
         }
       } on FileSystemException {
         // Fall through to return the default.
       }
     }
     return _sdkVersion;
   }
 
-  /**
-   * Return the name of the file containing the VM executable.
-   */
-  String get vmBinaryName {
-    if (OSUtilities.isWindows()) {
-      return _VM_EXECUTABLE_NAME_WIN;
-    } else {
-      return _VM_EXECUTABLE_NAME;
-    }
-  }
-
-  /**
-   * Return the file containing the VM executable, or `null` if it does not
-   * exist.
-   */
-  JavaFile get vmExecutable {
-    if (_vmExecutable == null) {
-      _vmExecutable = _verifyExecutable(new JavaFile.relative(
-          new JavaFile.relative(_sdkDirectory, _BIN_DIRECTORY_NAME),
-          vmBinaryName));
-    }
-    return _vmExecutable;
-  }
+//  /**
+//   * Return the name of the file containing the VM executable.
+//   */
+//  String get vmBinaryName {
+//    if (OSUtilities.isWindows()) {
+//      return _VM_EXECUTABLE_NAME_WIN;
+//    } else {
+//      return _VM_EXECUTABLE_NAME;
+//    }
+//  }
+//
+//  /**
+//   * Return the file containing the VM executable, or `null` if it does not
+//   * exist.
+//   */
+//  File get vmExecutable {
+//    if (_vmExecutable == null) {
+//      _vmExecutable = _verifyExecutable(_sdkDirectory
+//          .getChildAssumingFolder(_BIN_DIRECTORY_NAME)
+//          .getChildAssumingFile(vmBinaryName));
+//    }
+//    return _vmExecutable;
+//  }
 
   /**
    * Determine the search order for trying to locate the [_LIBRARIES_FILE].
    */
-  Iterable<JavaFile> get _libraryMapLocations sync* {
-    yield new JavaFile.relative(
-        new JavaFile.relative(
-            new JavaFile.relative(
-                new JavaFile.relative(libraryDirectory, _INTERNAL_DIR),
-                _SDK_LIBRARY_METADATA_DIR),
-            _SDK_LIBRARY_METADATA_LIB_DIR),
-        _LIBRARIES_FILE);
-    yield new JavaFile.relative(
-        new JavaFile.relative(libraryDirectory, _INTERNAL_DIR),
-        _LIBRARIES_FILE);
+  Iterable<File> get _libraryMapLocations sync* {
+    yield libraryDirectory
+        .getChildAssumingFolder(_INTERNAL_DIR)
+        .getChildAssumingFolder(_SDK_LIBRARY_METADATA_DIR)
+        .getChildAssumingFolder(_SDK_LIBRARY_METADATA_LIB_DIR)
+        .getChildAssumingFile(_LIBRARIES_FILE);
+    yield libraryDirectory
+        .getChildAssumingFolder(_INTERNAL_DIR)
+        .getChildAssumingFile(_LIBRARIES_FILE);
   }
 
-  /**
-   * Return the directory where dartium can be found (the directory that will be
-   * the working directory if Dartium is invoked without changing the default),
-   * assuming that the Editor was installed in the [installDir].
-   */
-  JavaFile getDartiumWorkingDirectory(JavaFile installDir) =>
-      new JavaFile.relative(installDir, _DARTIUM_DIRECTORY_NAME);
-
-  /**
-   * Return the auxiliary documentation file for the library with the given
-   * [libraryName], or `null` if no such file exists.
-   */
-  JavaFile getDocFileFor(String libraryName) {
-    JavaFile dir = docDirectory;
-    if (!dir.exists()) {
-      return null;
-    }
-    JavaFile libDir = new JavaFile.relative(dir, libraryName);
-    JavaFile docFile =
-        new JavaFile.relative(libDir, "$libraryName$_DOC_FILE_SUFFIX");
-    if (docFile.exists()) {
-      return docFile;
-    }
-    return null;
-  }
+//  /**
+//   * Return the directory where dartium can be found (the directory that will be
+//   * the working directory if Dartium is invoked without changing the default),
+//   * assuming that the Editor was installed in the [installDir].
+//   */
+//  Folder getDartiumWorkingDirectory(Folder installDir) =>
+//      installDir.getChildAssumingFolder(_DARTIUM_DIRECTORY_NAME);
+//
+//  /**
+//   * Return the auxiliary documentation file for the library with the given
+//   * [libraryName], or `null` if no such file exists.
+//   */
+//  File getDocFileFor(String libraryName) {
+//    Folder libDir = docDirectory.getChildAssumingFolder(libraryName);
+//    File docFile = libDir.getChildAssumingFile("$libraryName$_DOC_FILE_SUFFIX");
+//    if (docFile.exists) {
+//      return docFile;
+//    }
+//    return null;
+//  }
 
   @override
-  String getRelativePathFromFile(JavaFile file) {
-    String filePath = file.getAbsolutePath();
-    String libPath = libraryDirectory.getAbsolutePath();
-    if (!filePath.startsWith("$libPath${JavaFile.separator}")) {
+  String getRelativePathFromFile(File file) {
+    String filePath = file.path;
+    String libPath = libraryDirectory.path;
+    if (!filePath.startsWith("$libPath${pathos.separator}")) {
       return null;
     }
     return filePath.substring(libPath.length + 1);
   }
 
   /**
    * Return the [PackageBundle] for this SDK, if it exists, or `null` otherwise.
    * This method should not be used outside of `analyzer` and `analyzer_cli`
    * packages.
    */
   PackageBundle getSummarySdkBundle(bool strongMode) {
-    String rootPath = directory.getAbsolutePath();
+    String rootPath = directory.path;
     String name = strongMode ? 'strong.sum' : 'spec.sum';
     String path = pathos.join(rootPath, 'lib', '_internal', name);
     try {
-      File file = new File(path);
-      if (file.existsSync()) {
+      File file = resourceProvider.getFile(path);
+      if (file.exists) {
         List<int> bytes = file.readAsBytesSync();
         return new PackageBundle.fromBuffer(bytes);
       }
     } catch (exception, stackTrace) {
       AnalysisEngine.instance.logger.logError(
           'Failed to load SDK analysis summary from $path',
           new CaughtException(exception, stackTrace));
     }
     return null;
   }
 
   /**
    * Read all of the configuration files to initialize the library maps. The
    * flag [useDart2jsPaths] is `true` if the dart2js path should be used when it
    * is available. Return the initialized library map.
    */
   LibraryMap initialLibraryMap(bool useDart2jsPaths) {
     List<String> searchedPaths = <String>[];
     var lastStackTrace = null;
     var lastException = null;
-    for (JavaFile librariesFile in _libraryMapLocations) {
+    for (File librariesFile in _libraryMapLocations) {
       try {
         String contents = librariesFile.readAsStringSync();
         return new SdkLibrariesReader(useDart2jsPaths)
             .readFromFile(librariesFile, contents);
       } catch (exception, stackTrace) {
-        searchedPaths.add(librariesFile.getAbsolutePath());
+        searchedPaths.add(librariesFile.path);
         lastException = exception;
         lastStackTrace = stackTrace;
       }
     }
     AnalysisEngine.instance.logger.logError(
         "Could not initialize the library map from $searchedPaths",
         new CaughtException(lastException, lastStackTrace));
     return new LibraryMap();
   }
 
   @override
-  FileBasedSource internalMapDartUri(String dartUri) {
+  Source internalMapDartUri(String dartUri) {
     String libraryName;
     String relativePath;
     int index = dartUri.indexOf('/');
     if (index >= 0) {
       libraryName = dartUri.substring(0, index);
       relativePath = dartUri.substring(index + 1);
     } else {
       libraryName = dartUri;
       relativePath = "";
     }
     SdkLibrary library = getSdkLibrary(libraryName);
     if (library == null) {
       return null;
     }
     try {
-      JavaFile file = new JavaFile.relative(libraryDirectory, library.path);
+      File file = libraryDirectory.getChildAssumingFile(library.path);
       if (!relativePath.isEmpty) {
-        file = file.getParentFile();
-        file = new JavaFile.relative(file, relativePath);
+        file = file.parent.getChildAssumingFile(relativePath);
       }
-      return new FileBasedSource(file, parseUriWithException(dartUri));
+      return file.createSource(parseUriWithException(dartUri));
     } on URISyntaxException {
       return null;
     }
   }
 
   /**
-   * Return the given [file] if it exists and is executable, or `null` if it
-   * does not exist or is not executable.
+   * Return the default directory for the Dart SDK, or `null` if the directory
+   * cannot be determined (or does not exist). The default directory is provided
+   * by a system property named `com.google.dart.sdk`.
    */
-  JavaFile _verifyExecutable(JavaFile file) =>
-      file.isExecutable() ? file : null;
+  static Folder defaultSdkDirectory(ResourceProvider resourceProvider) {
+    // TODO(brianwilkerson) This is currently only being used in the analysis
+    // server's Driver class to find the default SDK. The command-line analyzer
+    // uses cli_utils to find the SDK. Not sure why they're different.
+    String sdkProperty = getSdkProperty(resourceProvider);
+    if (sdkProperty == null) {
+      return null;
+    }
+    Folder sdkDirectory = resourceProvider.getFolder(sdkProperty);
+    if (!sdkDirectory.exists) {
+      return null;
+    }
+    return sdkDirectory;
+  }
+
+  static String getSdkProperty(ResourceProvider resourceProvider) {
+    String exec = io.Platform.executable;
+    if (exec.length == 0) {
+      return null;
+    }
+    pathos.Context pathContext = resourceProvider.pathContext;
+    // Might be "xcodebuild/ReleaseIA32/dart" with "sdk" sibling
+    String outDir = pathContext.dirname(pathContext.dirname(exec));
+    String sdkPath = pathContext.join(pathContext.dirname(outDir), "sdk");
+    if (resourceProvider.getFolder(sdkPath).exists) {
+      return sdkPath;
+    }
+    // probably be "dart-sdk/bin/dart"
+    return pathContext.dirname(pathContext.dirname(exec));
+  }
 }
 
 /**
  * An object used to read and parse the libraries file
  * (dart-sdk/lib/_internal/sdk_library_metadata/lib/libraries.dart) for information
  * about the libraries in an SDK. The library information is represented as a
  * Dart file containing a single top-level variable whose value is a const map.
  * The keys of the map are the names of libraries defined in the SDK and the
  * values in the map are info objects defining the library. For example, a
  * subset of a typical SDK might have a libraries file that looks like the
@@ skipping 22 matching lines @@
   /**
    * Initialize a newly created library reader to use the dart2js path if
    * [_useDart2jsPaths] is `true`.
    */
   SdkLibrariesReader(this._useDart2jsPaths);
 
   /**
    * Return the library map read from the given [file], given that the content
    * of the file is already known to be [libraryFileContents].
    */
-  LibraryMap readFromFile(JavaFile file, String libraryFileContents) =>
-      readFromSource(new FileBasedSource(file), libraryFileContents);
+  LibraryMap readFromFile(File file, String libraryFileContents) =>
+      readFromSource(file.createSource(), libraryFileContents);
 
   /**
    * Return the library map read from the given [source], given that the content
    * of the file is already known to be [libraryFileContents].
    */
   LibraryMap readFromSource(Source source, String libraryFileContents) {
     BooleanErrorListener errorListener = new BooleanErrorListener();
     Scanner scanner = new Scanner(
         source, new CharSequenceReader(libraryFileContents), errorListener);
     Parser parser = new Parser(source, errorListener);
     CompilationUnit unit = parser.parseCompilationUnit(scanner.tokenize());
     SdkLibrariesReader_LibraryBuilder libraryBuilder =
         new SdkLibrariesReader_LibraryBuilder(_useDart2jsPaths);
     // If any syntactic errors were found then don't try to visit the AST
     // structure.
     if (!errorListener.errorReported) {
       unit.accept(libraryBuilder);
     }
     return libraryBuilder.librariesMap;
   }
 }