| // 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. |
| |
| package com.google.devtools.build.lib.packages; |
| |
| import com.google.devtools.build.lib.packages.Attribute.Transition; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Customizable transition which accepts the rule's nonconfigurable attributes. |
| */ |
| public interface RuleTransitionFactory { |
| /** |
| * Generates a transition to be used when entering the given rule. |
| * |
| * <p>This transition must be a PatchTransition, but that class is not accessible in this package. |
| * If this class determines that no transition should be performed, it should return {@code null}. |
| */ |
| @Nullable |
| Transition buildTransitionFor(Rule rule); |
| } |