com.facebook.buck.cxx.toolchain.PathShortener.java Source code

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Here is the source code for com.facebook.buck.cxx.toolchain.PathShortener.java

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/*
 * Copyright 2017-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.toolchain;

import com.facebook.buck.core.sourcepath.PathSourcePath;
import com.facebook.buck.io.file.MorePaths;
import com.google.common.base.Preconditions;
import java.nio.file.Path;

/** A function that may shorten a given path using variou strategies. */
public interface PathShortener {
    Path shorten(Path absolutePath);

    static PathShortener byRelativizingToWorkingDir(Path workingDir) {
        return (absolutePath) -> {
            Preconditions.checkState(absolutePath.isAbsolute(), "Expected preprocessor suffix to be absolute: %s",
                    absolutePath);
            Path relativePath = MorePaths.relativize(workingDir, absolutePath);
            return absolutePath.toString().length() > relativePath.toString().length() ? relativePath
                    : absolutePath;
        };
    }

    static PathShortener byRelativizingToWorkingDir(PathSourcePath workingDir) {
        return byRelativizingToWorkingDir(workingDir.getFilesystem().resolve(workingDir.getRelativePath()));
    }

    static PathShortener identity() {
        return x -> x;
    }
}