1 files changed, 49 insertions, 0 deletions
diff --git a/src/tools/android/java/com/google/devtools/build/android/desugar/io/InputFileProvider.java b/src/tools/android/java/com/google/devtools/build/android/desugar/io/InputFileProvider.java
new file mode 100644
index 0000000000..c41d018df8
--- /dev/null
+++ b/src/tools/android/java/com/google/devtools/build/android/desugar/io/InputFileProvider.java
@@ -0,0 +1,49 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.android.desugar.io;
+
+import com.google.errorprone.annotations.MustBeClosed;
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.zip.ZipEntry;
+
+/** Input file provider allows to iterate on relative path filename of a directory or a jar file. */
+public interface InputFileProvider extends Closeable, Iterable<String> {
+
+  /**
+   * Return a ZipEntry for {@code filename}. If the provider is a {@link ZipInputFileProvider}, the
+   * method returns the existing ZipEntry in order to keep its metadata, otherwise a new one is
+   * created.
+   */
+  ZipEntry getZipEntry(String filename);
+
+  /**
+   * This method returns an input stream allowing to read the file {@code filename}, it is the
+   * responsibility of the caller to close this stream.
+   */
+  InputStream getInputStream(String filename) throws IOException;
+
+  /** Transform a Path to an InputFileProvider that needs to be closed by the caller. */
+  @MustBeClosed
+  public static InputFileProvider open(Path path) throws IOException {
+    if (Files.isDirectory(path)) {
+      return new DirectoryInputFileProvider(path);
+    } else {
+      return new ZipInputFileProvider(path);
+    }
+  }
+}