com.stevpet.sonar.plugins.dotnet.mscover.codecoverage.command.ZipUtils.java Source code

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Here is the source code for com.stevpet.sonar.plugins.dotnet.mscover.codecoverage.command.ZipUtils.java

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/*******************************************************************************
 *
 * SonarQube MsCover Plugin
 * Copyright (C) 2015 SonarSource
 * dev@sonar.codehaus.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 *
 * Author: Peter Stevens, peter@famstevens.eu
 *******************************************************************************/
package com.stevpet.sonar.plugins.dotnet.mscover.codecoverage.command;

import org.apache.commons.io.IOUtils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * ZIP Utilities
 */
public final class ZipUtils {

    private static final int BUFFER_SIZE = 2048;

    private ZipUtils() {
    }

    /**
     * Extracts the specified folder from the specified archive, into the supplied output directory.
     * 
     * @param archivePath
     *          the archive Path
     * @param folderToExtract
     *          the folder to extract
     * @param outputDirectory
     *          the output directory
     * @return the extracted folder path
     * @throws IOException
     *           if a problem occurs while extracting
     */
    public static File extractArchiveFolderIntoDirectory(String archivePath, String folderToExtract,
            String outputDirectory) throws IOException {
        File destinationFolder = new File(outputDirectory);
        destinationFolder.mkdirs();

        ZipFile zip = null;
        try {
            zip = new ZipFile(new File(archivePath));
            Enumeration<?> zipFileEntries = zip.entries();
            // Process each entry
            while (zipFileEntries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();
                String currentEntry = entry.getName();
                if (currentEntry.startsWith(folderToExtract)) {
                    File destFile = new File(destinationFolder, currentEntry);
                    destFile.getParentFile().mkdirs();
                    if (!entry.isDirectory()) {
                        BufferedInputStream is = null;
                        BufferedOutputStream dest = null;
                        try {
                            is = new BufferedInputStream(zip.getInputStream(entry));
                            int currentByte;
                            // establish buffer for writing file
                            byte data[] = new byte[BUFFER_SIZE];

                            // write the current file to disk
                            FileOutputStream fos = new FileOutputStream(destFile);
                            dest = new BufferedOutputStream(fos, BUFFER_SIZE);

                            // read and write until last byte is encountered
                            while ((currentByte = is.read(data, 0, BUFFER_SIZE)) != -1) {
                                dest.write(data, 0, currentByte);
                            }
                        } finally {
                            if (dest != null) {
                                dest.flush();
                            }
                            IOUtils.closeQuietly(dest);
                            IOUtils.closeQuietly(is);
                        }
                    }
                }
            }
        } finally {
            if (zip != null) {
                zip.close();
            }
        }

        return new File(destinationFolder, folderToExtract);
    }

}