diff options
| -rw-r--r-- | src/reflect/scala/reflect/io/PlainFile.scala | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/reflect/scala/reflect/io/PlainFile.scala b/src/reflect/scala/reflect/io/PlainFile.scala index 31df78f995..b892fe7cef 100644 --- a/src/reflect/scala/reflect/io/PlainFile.scala +++ b/src/reflect/scala/reflect/io/PlainFile.scala @@ -56,8 +56,14 @@ class PlainFile(val givenPath: Path) extends AbstractFile { /** Returns all abstract subfiles of this abstract directory. */ def iterator: Iterator[AbstractFile] = { + // Optimization: Assume that the file was not deleted and did not have permissions changed + // between the call to `list` and the iteration. This saves a call to `exists`. + def existsFast(path: Path) = path match { + case (_: Directory | _: io.File) => true + case _ => path.exists + } if (!isDirectory) Iterator.empty - else givenPath.toDirectory.list filter (_.exists) map (new PlainFile(_)) + else givenPath.toDirectory.list filter existsFast map (new PlainFile(_)) } /** |