1 files changed, 76 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/FileStateFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/FileStateFunction.java
new file mode 100644
index 0000000000..ec2e871bbd
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/FileStateFunction.java
@@ -0,0 +1,76 @@
+// Copyright 2014 Google Inc. 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.skyframe;
+
+import com.google.devtools.build.lib.util.io.TimestampGranularityMonitor;
+import com.google.devtools.build.lib.vfs.RootedPath;
+import com.google.devtools.build.skyframe.SkyFunction;
+import com.google.devtools.build.skyframe.SkyFunctionException;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+
+import java.io.IOException;
+
+/**
+ * A {@link SkyFunction} for {@link FileStateValue}s.
+ *
+ * <p>Merely calls FileStateValue#create, but also has special handling for files outside the
+ * package roots (see {@link ExternalFilesHelper}).
+ */
+public class FileStateFunction implements SkyFunction {
+
+  private final TimestampGranularityMonitor tsgm;
+  private final ExternalFilesHelper externalFilesHelper;
+
+  public FileStateFunction(TimestampGranularityMonitor tsgm,
+      ExternalFilesHelper externalFilesHelper) {
+    this.tsgm = tsgm;
+    this.externalFilesHelper = externalFilesHelper;
+  }
+
+  @Override
+  public SkyValue compute(SkyKey skyKey, Environment env) throws FileStateFunctionException {
+    RootedPath rootedPath = (RootedPath) skyKey.argument();
+    externalFilesHelper.maybeAddDepOnBuildId(rootedPath, env);
+    if (env.valuesMissing()) {
+      return null;
+    }
+    try {
+      return FileStateValue.create(rootedPath, tsgm);
+    } catch (IOException e) {
+      throw new FileStateFunctionException(e);
+    } catch (InconsistentFilesystemException e) {
+      throw new FileStateFunctionException(e);
+    }
+  }
+
+  @Override
+  public String extractTag(SkyKey skyKey) {
+    return null;
+  }
+
+  /**
+   * Used to declare all the exception types that can be wrapped in the exception thrown by
+   * {@link FileStateFunction#compute}.
+   */
+  private static final class FileStateFunctionException extends SkyFunctionException {
+    public FileStateFunctionException(IOException e) {
+      super(e, Transience.TRANSIENT);
+    }
+
+    public FileStateFunctionException(InconsistentFilesystemException e) {
+      super(e, Transience.TRANSIENT);
+    }
+  }
+}