// 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.analysis;

import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;

/**
 * A {@link ConfiguredTarget} that has licensed targets in its transitive closure.
 */
@Immutable
public final class LicensesProviderImpl implements LicensesProvider {
  public static final LicensesProvider EMPTY =
      new LicensesProviderImpl(NestedSetBuilder.<TargetLicense>emptySet(Order.LINK_ORDER));

  private final NestedSet<TargetLicense> transitiveLicenses;

  public LicensesProviderImpl(NestedSet<TargetLicense> transitiveLicenses) {
    this.transitiveLicenses = transitiveLicenses;
  }

  @Override
  public NestedSet<TargetLicense> getTransitiveLicenses() {
    return transitiveLicenses;
  }
}