Move pub over to using the pub.dartlang.org API v2.

pkg/scheduled_test/lib/src/descriptor/directory_descriptor.dart

 // Copyright (c) 2013, 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 descriptor.directory;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:pathos/path.dart' as path;
 
 import '../../descriptor.dart';
 import '../../scheduled_test.dart';
 import '../utils.dart';
 
 /// A path builder to ensure that [load] uses POSIX paths.
 final path.Builder _path = new path.Builder(style: path.Style.posix);
 
 /// A descriptor describing a directory containing multiple files.
-class DirectoryDescriptor extends Descriptor {
+class DirectoryDescriptor extends Descriptor implements LoadableDescriptor {
   /// The entries contained within this directory. This is intentionally
   /// mutable.
   final List<Descriptor> contents;
 
   DirectoryDescriptor(String name, Iterable<Descriptor> contents)
       : super(name),
         contents = contents.toList();
 
   Future create([String parent]) => schedule(() {
     if (parent == null) parent = defaultRoot;
@@ skipping 21 matching lines @@
     })).then((results) {
       var errors = results.where((e) => e != null);
       if (errors.isEmpty) return;
       throw _DirectoryValidationError.merge(errors);
     });
   }
 
   Stream<List<int>> load(String pathToLoad) {
     return futureStream(new Future.value().then((_) {
       if (_path.isAbsolute(pathToLoad)) {
-        throw "Can't load absolute path '$pathToLoad'.";
+        throw new ArgumentError("Can't load absolute path '$pathToLoad'.");
       }
 
       var split = _path.split(_path.normalize(pathToLoad));
       if (split.isEmpty || split.first == '.' || split.first == '..') {
-        throw "Can't load '$pathToLoad' from within '$name'.";
+        throw new ArgumentError("Can't load '$pathToLoad' from within "
+            "'$name'.");
       }
 
-      var matchingEntries = contents.where((entry) =>
-          entry.name == split.first).toList();
+      var requiresReadable = split.length == 1;
+      var matchingEntries = contents.where((entry) {
+        return entry.name == split.first && (requiresReadable ?
+            entry is ReadableDescriptor :
+            entry is LoadableDescriptor);
+      }).toList();
 
+      var adjective = requiresReadable ? 'readable' : 'loadable';
       if (matchingEntries.length == 0) {
-        throw "Couldn't find an entry named '${split.first}' within '$name'.";
+        throw "Couldn't find a $adjective entry named '${split.first}' within "
+            "'$name'.";
       } else if (matchingEntries.length > 1) {
-        throw "Found multiple entries named '${split.first}' within '$name'.";
+        throw "Found multiple $adjective entries named '${split.first}' within "
+            "'$name'.";
       } else {
         var remainingPath = split.sublist(1);
         if (remainingPath.isEmpty) {
           return matchingEntries.first.read();
         } else {
           return matchingEntries.first.load(_path.joinAll(remainingPath));
         }
       }
     }));
   }
 
-  Stream<List<int>> read() => errorStream("Can't read the contents of '$name': "
-      "is a directory.");
-
   String describe() {
     if (contents.isEmpty) return name;
 
     var buffer = new StringBuffer();
     buffer.writeln(name);
     for (var entry in contents.take(contents.length - 1)) {
       var entryString = prefixLines(entry.describe(), prefix: '|   ')
           .replaceFirst('|   ', '|-- ');
       buffer.writeln(entryString);
     }
@@ skipping 20 matching lines @@
 
   _DirectoryValidationError(Iterable errors)
       : errors = errors.map((e) => e.toString()).toList();
 
   String toString() {
     if (errors.length == 1) return errors.single;
     return errors.map((e) => prefixLines(e, prefix: '  ', firstPrefix: '* '))
         .join('\n');
   }
 }