| // Copyright 2020 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.analysis; |
| |
| import com.google.devtools.build.lib.packages.AspectClass; |
| import com.google.devtools.build.lib.packages.Attribute; |
| import javax.annotation.Nullable; |
| |
| /** |
| * A kind of dependency, used extensively in {@link DependencyResolver}. |
| * |
| * <p>Usually an attribute, but other special-cased kinds exist, for example, for visibility or |
| * toolchains. |
| */ |
| public interface DependencyKind { |
| |
| /** |
| * The attribute through which a dependency arises. |
| * |
| * <p>Returns {@code null} for visibility, the dependency pointing from an output file to its |
| * generating rule and toolchain dependencies. |
| */ |
| @Nullable |
| Attribute getAttribute(); |
| |
| /** |
| * The aspect owning the attribute through which the dependency arises. |
| * |
| * <p>Should only be called for dependency kinds representing an attribute. |
| */ |
| @Nullable |
| AspectClass getOwningAspect(); |
| } |