New Analysis Engine translation.

editor/util/plugins/com.google.dart.java2dart/resources/java_io.dart

 library java.io;
 
 import "dart:io";
 import "dart:uri";
 
 class JavaSystemIO {
   static Map<String, String> _properties = new Map();
   static String getProperty(String name) {
     {
       String value = _properties[name];
@@ skipping 63 matching lines @@
   JavaFile getCanonicalFile() => new JavaFile(getCanonicalPath());
   bool exists() {
     if (_newFile().existsSync()) {
       return true;
     }
     if (_newDirectory().existsSync()) {
       return true;
     }
     return false;
   }
+  bool isDirectory() {
+    return _newDirectory().existsSync();
+  }
   Uri toURI() => new Uri.fromComponents(path: _path.toString());
   String readAsStringSync() => _newFile().readAsStringSync();
   int lastModified() => _newFile().lastModifiedSync().millisecondsSinceEpoch;
   File _newFile() => new File.fromPath(_path);
   Directory _newDirectory() => new Directory.fromPath(_path);
 }