Add new skyframe function to lookup the repository given a path, and use that

to report invalid package references. Fixes #1592.

--
MOS_MIGRATED_REVID=137164164

1 files changed, 166 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/LocalRepositoryLookupValue.java b/src/main/java/com/google/devtools/build/lib/skyframe/LocalRepositoryLookupValue.java
new file mode 100644
index 0000000000..794dcc37d6
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/LocalRepositoryLookupValue.java
@@ -0,0 +1,166 @@
+// Copyright 2016 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.skyframe;
+
+import com.google.devtools.build.lib.cmdline.RepositoryName;
+import com.google.devtools.build.lib.vfs.RootedPath;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+
+/**
+ * A value that represents a local repository lookup result.
+ *
+ * <p>Local repository lookups will always produce a value. The {@code #getRepository} method
+ * returns the name of the repository that the directory resides in.
+ */
+public abstract class LocalRepositoryLookupValue implements SkyValue {
+
+  static SkyKey key(RootedPath directory) {
+    return SkyKey.create(SkyFunctions.LOCAL_REPOSITORY_LOOKUP, directory);
+  }
+
+  private static final LocalRepositoryLookupValue MAIN_REPO_VALUE = new MainRepositoryLookupValue();
+  private static final LocalRepositoryLookupValue NOT_FOUND_VALUE =
+      new NotFoundLocalRepositoryLookupValue();
+
+  public static LocalRepositoryLookupValue mainRepository() {
+    return MAIN_REPO_VALUE;
+  }
+
+  public static LocalRepositoryLookupValue success(RepositoryName repositoryName) {
+    return new SuccessfulLocalRepositoryLookupValue(repositoryName);
+  }
+
+  public static LocalRepositoryLookupValue notFound() {
+    return NOT_FOUND_VALUE;
+  }
+
+  /**
+   * Returns {@code true} if the local repository lookup succeeded and the {@link #getRepository}
+   * method will return a useful result.
+   */
+  public abstract boolean exists();
+
+  /**
+   * Returns the {@link RepositoryName} of the local repository contained in the directory which was
+   * looked up, {@link RepositoryName#MAIN} if the directory is part of the main repository, or
+   * throws a {@link IllegalStateException} if there was no repository found.
+   */
+  public abstract RepositoryName getRepository();
+
+  /** Represents a successful lookup of the main repository. */
+  public static final class MainRepositoryLookupValue extends LocalRepositoryLookupValue {
+
+    // This should be a singleton value.
+    private MainRepositoryLookupValue() {}
+
+    @Override
+    public boolean exists() {
+      return true;
+    }
+
+    @Override
+    public RepositoryName getRepository() {
+      return RepositoryName.MAIN;
+    }
+
+    @Override
+    public String toString() {
+      return "MainRepositoryLookupValue";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      // All MainRepositoryLookupValue instances are equivalent.
+      return obj instanceof MainRepositoryLookupValue;
+    }
+
+    @Override
+    public int hashCode() {
+      return MainRepositoryLookupValue.class.getSimpleName().hashCode();
+    }
+  }
+
+  /** Represents a successful lookup of a local repository. */
+  public static final class SuccessfulLocalRepositoryLookupValue
+      extends LocalRepositoryLookupValue {
+    private final RepositoryName repositoryName;
+
+    public SuccessfulLocalRepositoryLookupValue(RepositoryName repositoryName) {
+      this.repositoryName = repositoryName;
+    }
+
+    @Override
+    public boolean exists() {
+      return true;
+    }
+
+    @Override
+    public RepositoryName getRepository() {
+      return repositoryName;
+    }
+
+    @Override
+    public String toString() {
+      return "SuccessfulLocalRepositoryLookupValue(" + repositoryName + ")";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof SuccessfulLocalRepositoryLookupValue)) {
+        return false;
+      }
+      SuccessfulLocalRepositoryLookupValue other = (SuccessfulLocalRepositoryLookupValue) obj;
+      return repositoryName.equals(other.repositoryName);
+    }
+
+    @Override
+    public int hashCode() {
+      return repositoryName.hashCode();
+    }
+  }
+
+  /** Represents the state where no repository was found, either local or the main repository. */
+  public static final class NotFoundLocalRepositoryLookupValue extends LocalRepositoryLookupValue {
+
+    // This should be a singleton value.
+    private NotFoundLocalRepositoryLookupValue() {}
+
+    @Override
+    public boolean exists() {
+      return false;
+    }
+
+    @Override
+    public RepositoryName getRepository() {
+      throw new IllegalStateException("Repository was not found");
+    }
+
+    @Override
+    public String toString() {
+      return "NotFoundLocalRepositoryLookupValue";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      // All NotFoundLocalRepositoryLookupValue instances are equivalent.
+      return obj instanceof NotFoundLocalRepositoryLookupValue;
+    }
+
+    @Override
+    public int hashCode() {
+      return NotFoundLocalRepositoryLookupValue.class.getSimpleName().hashCode();
+    }
+  }
+}