com.twitter.heron.downloader.Extractor.java Source code

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Here is the source code for com.twitter.heron.downloader.Extractor.java

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//  Copyright 2017 Twitter. 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.twitter.heron.downloader;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;

final class Extractor {

    static void extract(InputStream in, Path destination) throws IOException {
        try (final BufferedInputStream bufferedInputStream = new BufferedInputStream(in);
                final GzipCompressorInputStream gzipInputStream = new GzipCompressorInputStream(
                        bufferedInputStream);
                final TarArchiveInputStream tarInputStream = new TarArchiveInputStream(gzipInputStream)) {
            final String destinationAbsolutePath = destination.toFile().getAbsolutePath();

            TarArchiveEntry entry;
            while ((entry = (TarArchiveEntry) tarInputStream.getNextEntry()) != null) {
                if (entry.isDirectory()) {
                    File f = Paths.get(destinationAbsolutePath, entry.getName()).toFile();
                    f.mkdirs();
                } else {
                    Path fileDestinationPath = Paths.get(destinationAbsolutePath, entry.getName());

                    Files.copy(tarInputStream, fileDestinationPath, StandardCopyOption.REPLACE_EXISTING);
                }
            }
        }
    }

    private Extractor() {
    }
}