/*
* Copyright 2015-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.hashing;
import com.facebook.buck.io.MorePaths;
import com.facebook.buck.io.ProjectFilesystem;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.hash.Hasher;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
public class PathHashing {
// Utility class, do not instantiate.
private PathHashing() {}
private static final Path EMPTY_PATH = Paths.get("");
public static ImmutableSet<Path> hashPath(
Hasher hasher,
ProjectFileHashLoader fileHashLoader,
ProjectFilesystem projectFilesystem,
Path root)
throws IOException {
Preconditions.checkArgument(
!root.equals(EMPTY_PATH), "Path to hash (%s) must not be empty", root);
ImmutableSet.Builder<Path> children = ImmutableSet.builder();
for (Path path : ImmutableSortedSet.copyOf(projectFilesystem.getFilesUnderPath(root))) {
StringHashing.hashStringAndLength(hasher, MorePaths.pathWithUnixSeparators(path));
if (!root.equals(path)) {
children.add(root.relativize(path));
}
hasher.putBytes(fileHashLoader.get(path).asBytes());
}
return children.build();
}
}