Update from Google.

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MOE_MIGRATED_REVID=85702957

1 files changed, 111 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupValue.java b/src/main/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupValue.java
new file mode 100644
index 0000000000..16516b5534
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupValue.java
@@ -0,0 +1,111 @@
+// 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.common.base.Preconditions;
+import com.google.devtools.build.lib.packages.PackageIdentifier;
+import com.google.devtools.build.lib.vfs.Path;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+
+/**
+ * A value that represents the result of looking for the existence of a package that owns a
+ * specific directory path. Compare with {@link PackageLookupValue}, which deals with existence of
+ * a specific package.
+ */
+public abstract class ContainingPackageLookupValue implements SkyValue {
+  /** Returns whether there is a containing package. */
+  public abstract boolean hasContainingPackage();
+
+  /** If there is a containing package, returns its name. */
+  abstract PackageIdentifier getContainingPackageName();
+
+  /** If there is a containing package, returns its package root */
+  public abstract Path getContainingPackageRoot();
+
+  public static SkyKey key(PackageIdentifier id) {
+    Preconditions.checkArgument(!id.getPackageFragment().isAbsolute(), id);
+    return new SkyKey(SkyFunctions.CONTAINING_PACKAGE_LOOKUP, id);
+  }
+
+  static ContainingPackageLookupValue noContainingPackage() {
+    return NoContainingPackage.INSTANCE;
+  }
+
+  static ContainingPackageLookupValue withContainingPackage(PackageIdentifier pkgId, Path root) {
+    return new ContainingPackage(pkgId, root);
+  }
+
+  private static class NoContainingPackage extends ContainingPackageLookupValue {
+    private static final NoContainingPackage INSTANCE = new NoContainingPackage();
+
+    @Override
+    public boolean hasContainingPackage() {
+      return false;
+    }
+
+    @Override
+    public PackageIdentifier getContainingPackageName() {
+      throw new IllegalStateException();
+    }
+
+    @Override
+    public Path getContainingPackageRoot() {
+      throw new IllegalStateException();
+    }
+  }
+
+  private static class ContainingPackage extends ContainingPackageLookupValue {
+    private final PackageIdentifier containingPackage;
+    private final Path containingPackageRoot;
+
+    private ContainingPackage(PackageIdentifier pkgId, Path containingPackageRoot) {
+      this.containingPackage = pkgId;
+      this.containingPackageRoot = containingPackageRoot;
+    }
+
+    @Override
+    public boolean hasContainingPackage() {
+      return true;
+    }
+
+    @Override
+    public PackageIdentifier getContainingPackageName() {
+      return containingPackage;
+    }
+
+    @Override
+    public Path getContainingPackageRoot() {
+      return containingPackageRoot;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj) {
+        return true;
+      }
+      if (!(obj instanceof ContainingPackage)) {
+        return false;
+      }
+      ContainingPackage other = (ContainingPackage) obj;
+      return containingPackage.equals(other.containingPackage)
+          && containingPackageRoot.equals(other.containingPackageRoot);
+    }
+
+    @Override
+    public int hashCode() {
+      return containingPackage.hashCode();
+    }
+  }
+}