java_proto_library: add support for avoiding generating code for protos that are already compiled into a proto runtime.

--
MOS_MIGRATED_REVID=127489419

1 files changed, 11 insertions, 9 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/cmdline/Label.java b/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
index 9ca11b6e07..65f0ce867d 100644
--- a/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
+++ b/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.cmdline;
 
+import com.google.common.base.Function;
 import com.google.common.collect.ComparisonChain;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Interner;
@@ -28,11 +29,11 @@ import com.google.devtools.build.lib.util.Preconditions;
 import com.google.devtools.build.lib.util.StringCanonicalizer;
 import com.google.devtools.build.lib.util.StringUtilities;
 import com.google.devtools.build.lib.vfs.PathFragment;
-
 import java.io.IOException;
 import java.io.InvalidObjectException;
 import java.io.ObjectInputStream;
 import java.io.Serializable;
+import javax.annotation.Nullable;
 
 /**
  * A class to identify a BUILD target. All targets belong to exactly one package. The name of a
@@ -143,6 +144,15 @@ public final class Label implements Comparable<Label>, Serializable, SkylarkPrin
     return parseAbsoluteUnchecked(absName, true);
   }
 
+  /** A long way to say '(String) s -> parseAbsoluteUnchecked(s)'. */
+  public static final Function<String, Label> PARSE_ABSOLUTE_UNCHECKED =
+      new Function<String, Label>() {
+        @Override
+        public Label apply(@Nullable String s) {
+          return s == null ? null : parseAbsoluteUnchecked(s);
+        }
+      };
+
   /**
    * Factory for Labels from separate components.
    *
@@ -341,14 +351,6 @@ public final class Label implements Comparable<Label>, Serializable, SkylarkPrin
     return packageIdentifier.getPackageFragment();
   }
 
-  public static final com.google.common.base.Function<Label, PathFragment> PACKAGE_FRAGMENT =
-      new com.google.common.base.Function<Label, PathFragment>() {
-        @Override
-        public PathFragment apply(Label label) {
-          return label.getPackageFragment();
-        }
-  };
-
   /**
    * Returns the label as a path fragment, using the package and the label name.
    */