| /* |
| * Copyright 2012-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.model; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Optional; |
| import com.google.common.collect.FluentIterable; |
| |
| import java.nio.file.Path; |
| import java.util.Collection; |
| |
| /** |
| * Interface to allow looking up parents and children of build files. |
| * E.g. for a directory structure that looks like: |
| * foo/BUCK |
| * foo/bar/baz/BUCK |
| * foo/bar/qux/BUCK |
| * |
| * foo/BUCK is the parent of foo/bar/baz/BUCK and foo/bar/qux/BUCK. |
| */ |
| public abstract class BuildFileTree { |
| /** |
| * No-arg constructor, provided so that subclasses can be constructed. |
| */ |
| protected BuildFileTree() {} |
| |
| /** |
| * @return paths relative to BuildTarget that contain their own build files. E.g. |
| */ |
| public abstract Collection<Path> getChildPaths(BuildTarget target); |
| |
| /** |
| * Returns the base path for a given path. The base path is the nearest directory at or |
| * above filePath that contains a build file. |
| * |
| * @param filePath the path whose base path to find. |
| * @return the base path if there is one. |
| */ |
| public abstract Optional<Path> getBasePathOfAncestorTarget(Path filePath); |
| |
| /** |
| * Returns the base paths for zero or more targets. |
| * |
| * @param targets targets to return base paths for |
| * @return base paths for targets |
| */ |
| protected static Collection<Path> collectBasePaths(Iterable<? extends BuildTarget> targets) { |
| |
| return FluentIterable.from(targets).transform( |
| new Function<BuildTarget, Path>() { |
| @Override |
| public Path apply(BuildTarget input) { |
| return input.getBasePath(); |
| } |
| }) |
| .toSet(); |
| } |
| } |