// Copies all files under srcDir to dstDir.
    // If dstDir does not exist, it will be created.
    public void copyDirectory(File srcDir, File dstDir) throws IOException {
        if (srcDir.isDirectory()) {
            if (!dstDir.exists()) {
                dstDir.mkdir();
            }
   
            String[] children = srcDir.list();
            for (int i=0; i<children.length; i++) {
                copyDirectory(new File(srcDir, children[i]),
                                     new File(dstDir, children[i]));
            }
        } else {
            // This method is implemented in e1071 Copying a File
            copyFile(srcDir, dstDir);
        }
    }

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