| // Copyright 2015 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.skyframe; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.skyframe.SkyKey; |
| |
| /** |
| * Emits an error message exactly once when a Skylark import cycle is found when running inlined |
| * {@link SkylarkImportLookupFunction}s. |
| */ |
| class SkylarkImportUniqueCycleFunction extends AbstractChainUniquenessFunction<Label> { |
| |
| static SkyKey key(ImmutableList<Label> cycle) { |
| return ChainUniquenessUtils.key(SkyFunctions.SKYLARK_IMPORT_CYCLE, cycle); |
| } |
| |
| @Override |
| protected String getConciseDescription() { |
| return "cycle in referenced extension files"; |
| } |
| |
| @Override |
| protected String getHeaderMessage() { |
| return ""; |
| } |
| |
| @Override |
| protected String getFooterMessage() { |
| return ""; |
| } |
| |
| @Override |
| protected String elementToString(Label importLabel) { |
| return importLabel.toString(); |
| } |
| } |