| /* |
| * Copyright 2014-present Facebook, Inc. |
| * |
| * 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.facebook.buck.cxx; |
| |
| import com.facebook.buck.model.BuildTarget; |
| import com.facebook.buck.rules.BuildRule; |
| import com.facebook.buck.rules.BuildRuleParams; |
| import com.facebook.buck.rules.BuildRuleType; |
| import com.facebook.buck.rules.ImmutableBuildRuleType; |
| import com.facebook.buck.rules.SourcePathResolver; |
| import com.google.common.base.Suppliers; |
| import com.google.common.collect.ImmutableSortedSet; |
| |
| /** |
| * A dummy {@link BuildRule} that stores items in the action graph. This is mainly useful as a |
| * "summary" of several build rules, which are generated together, and allows checking if they |
| * have all been created via a single build rule lookup in the action graph. This is useful for |
| * how the C/C++ support lazily generates actions for the build rule. |
| */ |
| public class ContainerBuildRule<T> extends NoopBuildRule { |
| |
| private static final BuildRuleType TYPE = ImmutableBuildRuleType.of("container"); |
| |
| private final T item; |
| |
| private ContainerBuildRule(BuildRuleParams params, SourcePathResolver resolver, T item) { |
| super(params, resolver); |
| this.item = item; |
| } |
| |
| public static <T> ContainerBuildRule<T> of( |
| BuildRuleParams params, |
| SourcePathResolver resolver, |
| BuildTarget target, |
| T item) { |
| return new ContainerBuildRule<>( |
| params.copyWithChanges( |
| TYPE, |
| target, |
| Suppliers.ofInstance(ImmutableSortedSet.<BuildRule>of()), |
| Suppliers.ofInstance(ImmutableSortedSet.<BuildRule>of())), |
| resolver, |
| item); |
| } |
| |
| public T get() { |
| return item; |
| } |
| |
| } |