| // Copyright 2018 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.trimming; |
| |
| import java.util.function.BiFunction; |
| |
| /** |
| * Interface describing a function which compares two configurations and determines their |
| * relationship. |
| */ |
| @FunctionalInterface |
| public interface ConfigurationComparer<ConfigurationT> |
| extends BiFunction<ConfigurationT, ConfigurationT, ConfigurationComparer.Result> { |
| /** The outcome of comparing two configurations. */ |
| public enum Result { |
| /** |
| * All fragments in the first configuration are present and equal in the second, and vice versa. |
| */ |
| EQUAL(true, true, true), |
| /** |
| * All shared fragments are equal, but the second configuration has additional fragments the |
| * first does not. |
| */ |
| SUBSET(true, false, true), |
| /** |
| * All shared fragments are equal, but the first configuration has additional fragments the |
| * second does not. |
| */ |
| SUPERSET(false, true, true), |
| /** |
| * The two configurations each have fragments the other does not, but the shared fragments are |
| * equal. |
| */ |
| ALL_SHARED_FRAGMENTS_EQUAL(false, false, true), |
| /** At least one fragment shared between the two configurations is unequal. */ |
| DIFFERENT(false, false, false); |
| |
| private final boolean isSubsetOrEqual; |
| private final boolean isSupersetOrEqual; |
| private final boolean hasEqualSharedFragments; |
| |
| Result(boolean isSubsetOrEqual, boolean isSupersetOrEqual, boolean hasEqualSharedFragments) { |
| this.isSubsetOrEqual = isSubsetOrEqual; |
| this.isSupersetOrEqual = isSupersetOrEqual; |
| this.hasEqualSharedFragments = hasEqualSharedFragments; |
| } |
| |
| public boolean isSubsetOrEqual() { |
| return isSubsetOrEqual; |
| } |
| |
| public boolean isSupersetOrEqual() { |
| return isSupersetOrEqual; |
| } |
| |
| public boolean hasEqualSharedFragments() { |
| return hasEqualSharedFragments; |
| } |
| } |
| } |