com.comcast.cdn.traffic_control.traffic_router.neustar.data.TarExtractor.java Source code

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Here is the source code for com.comcast.cdn.traffic_control.traffic_router.neustar.data.TarExtractor.java

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/*
 *
 * 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.comcast.cdn.traffic_control.traffic_router.neustar.data;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.log4j.Logger;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class TarExtractor {
    private final Logger LOGGER = Logger.getLogger(TarExtractor.class);

    public boolean extractTo(File directory, InputStream inputStream) {
        try (TarArchiveInputStream tarArchiveInputStream = new TarArchiveInputStream(inputStream)) {
            TarArchiveEntry tarArchiveEntry;
            while ((tarArchiveEntry = tarArchiveInputStream.getNextTarEntry()) != null) {
                if (tarArchiveEntry.isDirectory()) {
                    continue;
                }

                File file = new File(directory, tarArchiveEntry.getName());
                LOGGER.info("Extracting Tarfile entry " + tarArchiveEntry.getName() + " to temporary location "
                        + file.getAbsolutePath());

                if (!file.exists() && !file.createNewFile()) {
                    LOGGER.warn("Failed to extract file to " + file.getAbsolutePath()
                            + ", cannot create file, check permissions of " + directory.getAbsolutePath());
                    return false;
                }

                copyInputStreamToFile(tarArchiveInputStream, file);
            }
        } catch (IOException e) {
            LOGGER.error("Failed extracting tar archive to directory " + directory.getAbsolutePath() + " : "
                    + e.getMessage());
            return false;
        }

        return true;
    }

    protected void copyInputStreamToFile(InputStream inputStream, File file) throws IOException {
        byte[] buffer = new byte[50 * 1024 * 1024];
        int bytesRead;

        try (FileOutputStream outputStream = new FileOutputStream(file)) {
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
        }
    }
}