Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/analyzer/file_system/physical_file_system.dart

Index: observatory_pub_packages/analyzer/file_system/physical_file_system.dart
===================================================================
--- observatory_pub_packages/analyzer/file_system/physical_file_system.dart	(revision 0)
+++ observatory_pub_packages/analyzer/file_system/physical_file_system.dart	(working copy)
@@ -0,0 +1,157 @@
+// Copyright (c) 2014, 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 physical_file_system;
+
+import 'dart:async';
+import 'dart:io' as io;
+
+import 'package:analyzer/src/generated/java_io.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+import 'package:path/path.dart';
+import 'package:watcher/watcher.dart';
+
+import 'file_system.dart';
+
+
+/**
+ * A `dart:io` based implementation of [ResourceProvider].
+ */
+class PhysicalResourceProvider implements ResourceProvider {
+  static final PhysicalResourceProvider INSTANCE =
+      new PhysicalResourceProvider._();
+
+  PhysicalResourceProvider._();
+
+  @override
+  Context get pathContext => io.Platform.isWindows ? windows : posix;
+
+  @override
+  Resource getResource(String path) {
+    if (io.FileSystemEntity.isDirectorySync(path)) {
+      io.Directory directory = new io.Directory(path);
+      return new _PhysicalFolder(directory);
+    } else {
+      io.File file = new io.File(path);
+      return new _PhysicalFile(file);
+    }
+  }
+}
+
+
+/**
+ * A `dart:io` based implementation of [File].
+ */
+class _PhysicalFile extends _PhysicalResource implements File {
+  _PhysicalFile(io.File file) : super(file);
+
+  @override
+  Source createSource([Uri uri]) {
+    io.File file = _entry as io.File;
+    JavaFile javaFile = new JavaFile(file.absolute.path);
+    if (uri == null) {
+      uri = javaFile.toURI();
+    }
+    return new FileBasedSource.con2(uri, javaFile);
+  }
+
+  @override
+  bool isOrContains(String path) {
+    return path == this.path;
+  }
+}
+
+
+/**
+ * A `dart:io` based implementation of [Folder].
+ */
+class _PhysicalFolder extends _PhysicalResource implements Folder {
+  _PhysicalFolder(io.Directory directory) : super(directory);
+
+  @override
+  Stream<WatchEvent> get changes => new DirectoryWatcher(_entry.path).events;
+
+  @override
+  String canonicalizePath(String relPath) {
+    return normalize(join(_entry.absolute.path, relPath));
+  }
+
+  @override
+  bool contains(String path) {
+    return isWithin(this.path, path);
+  }
+
+  @override
+  Resource getChild(String relPath) {
+    String canonicalPath = canonicalizePath(relPath);
+    return PhysicalResourceProvider.INSTANCE.getResource(canonicalPath);
+  }
+
+  @override
+  List<Resource> getChildren() {
+    List<Resource> children = <Resource>[];
+    io.Directory directory = _entry as io.Directory;
+    List<io.FileSystemEntity> entries = directory.listSync(recursive: false);
+    int numEntries = entries.length;
+    for (int i = 0; i < numEntries; i++) {
+      io.FileSystemEntity entity = entries[i];
+      if (entity is io.Directory) {
+        children.add(new _PhysicalFolder(entity));
+      } else if (entity is io.File) {
+        children.add(new _PhysicalFile(entity));
+      }
+    }
+    return children;
+  }
+
+  @override
+  bool isOrContains(String path) {
+    if (path == this.path) {
+      return true;
+    }
+    return contains(path);
+  }
+}
+
+
+/**
+ * A `dart:io` based implementation of [Resource].
+ */
+abstract class _PhysicalResource implements Resource {
+  final io.FileSystemEntity _entry;
+
+  _PhysicalResource(this._entry);
+
+  @override
+  bool get exists => _entry.existsSync();
+
+  @override
+  get hashCode => path.hashCode;
+
+  @override
+  Folder get parent {
+    String parentPath = dirname(path);
+    if (parentPath == path) {
+      return null;
+    }
+    return new _PhysicalFolder(new io.Directory(parentPath));
+  }
+
+  @override
+  String get path => _entry.absolute.path;
+
+  @override
+  String get shortName => basename(path);
+
+  @override
+  bool operator ==(other) {
+    if (runtimeType != other.runtimeType) {
+      return false;
+    }
+    return path == other.path;
+  }
+
+  @override
+  String toString() => path;
+}