com.facebook.util.FileUtils.java Source code

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Here is the source code for com.facebook.util.FileUtils.java

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/*
 * Copyright (C) 2012 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.util;

import com.google.common.io.PatternFilenameFilter;

import java.io.File;
import java.io.FilenameFilter;

public class FileUtils {
    private FileUtils() {
        throw new AssertionError("not instantiable");
    }

    public static String backtrackToFile(String startDir, String targetFile) {
        FilenameFilter filenameFilter = new PatternFilenameFilter(targetFile);
        File currentDir = new File(startDir).getAbsoluteFile();

        while (currentDir.getParentFile() != null) {
            String[] files = currentDir.list(filenameFilter);
            if (files.length == 1) {
                return currentDir.getAbsolutePath();
            } else {
                currentDir = currentDir.getParentFile();
            }
        }

        return null;
    }
}