FileUtils.java

package org.objectweb.jonas_lib.genbase.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

public class FileUtils {

    public static final int MAX_BUFFER_SIZE = 1024;

    private FileUtils() {
    }

    public static File unpack(JarFile source) throws IOException {
        TempRepository tr = TempRepository.getInstance();
        File tmp = tr.createDir();

        for (Enumeration e = source.entries(); e.hasMoreElements();) {
            ZipEntry ze = (ZipEntry) e.nextElement();

            if (!ze.getName().endsWith("/")) {
                unpack(ze.getName(), source.getInputStream(ze), tmp);
            }
        }

        return tmp;
    }

    private static void unpack(String name, InputStream is, File root) throws IOException {
        // create directories if needed
        String sysfilename = name.replace('/', File.separator.toCharArray()[0]);
        String filename = sysfilename.substring(sysfilename.lastIndexOf(File.separator) + 1);
        String dirname = sysfilename.substring(0, sysfilename.lastIndexOf(File.separator) + 1);
        File dir = new File(root, dirname);

        if (!dir.exists()) {
            dir.mkdirs();
        }

        // fill the new file
        OutputStream os = new FileOutputStream(new File(dir, filename));

        fill(is, os);

        os.close();
        is.close();
    }

    private static void fill(InputStream is, OutputStream os) throws IOException {
        byte[] buffer = new byte[MAX_BUFFER_SIZE];
        int read;

        while ((read = is.read(buffer, 0, MAX_BUFFER_SIZE)) != -1) {
            os.write(buffer, 0, read);
        }
    }

    public static void copy(File source, File target) throws IOException {
        InputStream is = new FileInputStream(source);
        OutputStream os = new FileOutputStream(new File(target, source.getName()));
        fill(is, os);
        is.close();
        os.close();

    }
}

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