1 files changed, 57 insertions, 0 deletions
diff --git a/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/FileSystem.scala b/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/FileSystem.scala
new file mode 100644
index 0000000..99a8ca2
--- /dev/null
+++ b/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/classpath/builder/FileSystem.scala
@@ -0,0 +1,57 @@
+package scala.scalajs.tools.classpath.builder
+
+import scala.scalajs.tools.io._
+
+import scala.collection.immutable.Traversable
+
+import java.io.{InputStream, Reader}
+
+/** Abstraction of a FileSystem, so classpath builders can be used with virtual
+ *  file systems
+ */
+trait FileSystem {
+
+  type File
+
+  /** Dummy version constant to identify files for which a version can not be
+   *  found.
+   *  This constant should never collide with the result of getVersion.
+   */
+  val DummyVersion: String
+
+  def isDirectory(f: File): Boolean
+  def isFile(f: File): Boolean
+  def isJSFile(f: File): Boolean
+  def isIRFile(f: File): Boolean
+  def isJARFile(f: File): Boolean
+  def exists(f: File): Boolean
+
+  def getName(f: File): String
+  /** A string that uniquely identifies this file's location */
+  def getAbsolutePath(f: File): String
+  /** A string that identifies the version of a file: If it equals the version
+   *  of another file with the same absolute path, the two files must be equal.
+   *  This is usually the lastModified date, but ordering is not required
+   */
+  def getVersion(f: File): String
+  /** A string that globally identifies the version of a file: If it equals the
+   *  global version of any other file, they must equal.
+   */
+  def getGlobalVersion(f: File): String =
+    CacheUtils.joinVersions(getAbsolutePath(f), getVersion(f))
+
+  /** A string that globally identifies a file for which a version can not be
+   *  found. Example: a file that does not exists.
+   */
+  def getDummyVersion(f: File): String =
+    CacheUtils.joinVersions(getAbsolutePath(f), DummyVersion)
+
+  /** List files in a directory */
+  def listFiles(d: File): Traversable[File]
+
+  def toJSFile(f: File): VirtualJSFile
+  def toIRFile(f: File): VirtualScalaJSIRFile
+  def toReader(f: File): Reader
+  def toInputStream(f: File): InputStream
+
+}