// 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.cpp;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableSet;

/**
 * Object encapsulating which additional toolchain features should be enabled and/or disabled.
 */
@AutoValue
public abstract class FeatureSpecification {

  public static final FeatureSpecification EMPTY =
      create(ImmutableSet.<String>of(), ImmutableSet.<String>of());

  public static final FeatureSpecification create(
      ImmutableSet<String> requestedFeatures, ImmutableSet<String> unsupportedFeatures) {
    return new AutoValue_FeatureSpecification(requestedFeatures, unsupportedFeatures);
  }

  public abstract ImmutableSet<String> getRequestedFeatures();

  public abstract ImmutableSet<String> getUnsupportedFeatures();
}