src/main/java/com/google/devtools/build/lib/skyframe/SkylarkImportUniqueCycleValue.java


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// 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.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;

/**
 * If {@link SkylarkImportLookupFunction} is inlined, this is used to emit cycle errors exactly
 * once.
 */
public class SkylarkImportUniqueCycleValue implements SkyValue {
  static SkyKey key(ImmutableList<SkyKey> cycle) {
    return AbstractChainUniquenessValue.key(SkyFunctions.SKYLARK_IMPORT_CYCLE, cycle);
  }
}