| // 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.rules; |
| |
| import com.google.devtools.build.lib.analysis.TransitiveInfoCollection; |
| import com.google.devtools.build.lib.util.Preconditions; |
| |
| /** |
| * An abstract class for adding a Skylark API for the native providers. |
| * Derived classes should declare functions to be used from Skylark. |
| */ |
| public abstract class SkylarkApiProvider { |
| private TransitiveInfoCollection info; |
| |
| protected TransitiveInfoCollection getInfo() { |
| return info; |
| } |
| |
| /** Must be called once (and only once). */ |
| public void init(TransitiveInfoCollection info) { |
| Preconditions.checkState(this.info == null); |
| this.info = Preconditions.checkNotNull(info); |
| } |
| } |