|  | # Copyright 2017 Google Inc. All Rights Reserved. | 
|  | # Copyright 2017 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. | 
|  |  | 
|  | """This rule exposes the source jar of a java_*_library rule as a label.""" | 
|  |  | 
|  | def _java_library_srcs_impl(ctx): | 
|  | if len(ctx.attr.deps) != 1: | 
|  | fail("Only one deps value supported", "deps") | 
|  | dep = ctx.attr.deps[0] | 
|  | return [DefaultInfo(files = depset(dep[JavaInfo].source_jars))] | 
|  |  | 
|  | _java_library_srcs = rule( | 
|  | implementation = _java_library_srcs_impl, | 
|  | attrs = { | 
|  | "deps": attr.label_list( | 
|  | mandatory = True, | 
|  | allow_empty = False, | 
|  | providers = [JavaInfo], | 
|  | ), | 
|  | }, | 
|  | ) | 
|  |  | 
|  | def java_library_srcs(name, deps, visibility = None, **kwargs): | 
|  | """Provides the source jars generated by a java_*_library rule.""" | 
|  | _java_library_srcs(name = name, deps = deps, visibility = visibility, **kwargs) |