1 files changed, 51 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/vfs/AbstractFileSystemWithCustomStat.java b/src/main/java/com/google/devtools/build/lib/vfs/AbstractFileSystemWithCustomStat.java
new file mode 100644
index 0000000000..db4fca94d5
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/vfs/AbstractFileSystemWithCustomStat.java
@@ -0,0 +1,51 @@
+// Copyright 2015 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.lib.vfs;
+
+import java.io.IOException;
+
+/**
+ * An {@link AbstractFileSystem} that provides default implementations of {@link FileSystem#isFile}
+ * et al. in terms of {@link FileSystem#stat} (rather than the other way around, which is what
+ * {@link FileSystem} does).
+ */
+public abstract class AbstractFileSystemWithCustomStat extends AbstractFileSystem {
+  @Override
+  protected boolean isFile(Path path, boolean followSymlinks) {
+    FileStatus stat = statNullable(path, followSymlinks);
+    return stat != null ? stat.isFile() : false;
+  }
+
+  @Override
+  protected boolean isSpecialFile(Path path, boolean followSymlinks) {
+    FileStatus stat = statNullable(path, followSymlinks);
+    return stat != null ? stat.isSpecialFile() : false;
+  }
+
+  @Override
+  protected boolean isSymbolicLink(Path path) {
+    FileStatus stat = statNullable(path, false);
+    return stat != null ? stat.isSymbolicLink() : false;
+  }
+
+  @Override
+  protected boolean isDirectory(Path path, boolean followSymlinks) {
+    FileStatus stat = statNullable(path, followSymlinks);
+    return stat != null ? stat.isDirectory() : false;
+  }
+
+  @Override
+  protected abstract FileStatus stat(Path path, boolean followSymlinks) throws IOException;
+}
+