1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/FileProviderApi.java b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/FileProviderApi.java
new file mode 100644
index 0000000000..da524123b2
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/FileProviderApi.java
@@ -0,0 +1,46 @@
+// Copyright 2014 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.skylarkbuildapi;
+
+import com.google.devtools.build.lib.collect.nestedset.NestedSet;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
+
+/** A representation of the concept "this builds these files". */
+@SkylarkModule(
+    name = "file_provider",
+    doc = "An interface for rules that provide files.",
+    category = SkylarkModuleCategory.PROVIDER)
+public interface FileProviderApi {
+
+  /**
+   * Returns the set of files that are the "output" of this rule.
+   *
+   * <p>The term "output" is somewhat hazily defined; it is vaguely the set of files that are passed
+   * on to dependent rules that list the rule in their {@code srcs} attribute and the set of files
+   * that are built when a rule is mentioned on the command line. It does <b>not</b> include the
+   * runfiles.
+   *
+   * <p>Note that the above definition is somewhat imprecise; in particular, when a rule is
+   * mentioned on the command line, some other files are also built and dependent rules are free to
+   * filter this set of files e.g. based on their extension.
+   *
+   * <p>Also, some rules may generate files that are not listed here by way of defining other
+   * implicit targets, for example, deploy jars.
+   */
+  @SkylarkCallable(name = "files_to_build", documented = false, structField = true)
+  NestedSet<? extends FileApi> getFilesToBuild();
+}