1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeDependencyResolver.java b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeDependencyResolver.java
new file mode 100644
index 0000000000..1c7cbfa751
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeDependencyResolver.java
@@ -0,0 +1,68 @@
+// 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.analysis.DependencyResolver;
+import com.google.devtools.build.lib.analysis.TargetAndConfiguration;
+import com.google.devtools.build.lib.events.Event;
+import com.google.devtools.build.lib.packages.NoSuchThingException;
+import com.google.devtools.build.lib.packages.Target;
+import com.google.devtools.build.lib.packages.TargetUtils;
+import com.google.devtools.build.lib.syntax.Label;
+import com.google.devtools.build.skyframe.SkyFunction.Environment;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+
+import javax.annotation.Nullable;
+
+/**
+ * A dependency resolver for use within Skyframe. Loads packages lazily when possible.
+ */
+public final class SkyframeDependencyResolver extends DependencyResolver {
+
+  private final Environment env;
+
+  public SkyframeDependencyResolver(Environment env) {
+    this.env = env;
+  }
+
+  @Override
+  protected void invalidVisibilityReferenceHook(TargetAndConfiguration value, Label label) {
+    env.getListener().handle(
+        Event.error(TargetUtils.getLocationMaybe(value.getTarget()), String.format(
+            "Label '%s' in visibility attribute does not refer to a package group", label)));
+  }
+
+  @Override
+  protected void invalidPackageGroupReferenceHook(TargetAndConfiguration value, Label label) {
+    env.getListener().handle(
+        Event.error(TargetUtils.getLocationMaybe(value.getTarget()), String.format(
+            "label '%s' does not refer to a package group", label)));
+  }
+
+  @Nullable
+  @Override
+  protected Target getTarget(Label label) throws NoSuchThingException {
+    if (env.getValue(TargetMarkerValue.key(label)) == null) {
+      return null;
+    }
+    SkyKey key = PackageValue.key(label.getPackageIdentifier());
+    SkyValue value = env.getValue(key);
+    if (value == null) {
+      return null;
+    }
+    PackageValue packageValue = (PackageValue) value;
+    return packageValue.getPackage().getTarget(label.getName());
+  }
+}