Java Utililty Methods Path File Extention nio

List of utility methods to do Path File Extention nio

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Description

The list of methods to do Path File Extention nio are organized into topic(s).

Method

StringinsertSuffixBeforeExtension(String path, String suffix)
insert Suffix Before Extension 
return getFullNameWithoutExtension(path) + suffix + "." + getExtension(path);
ListlistFile(final String path, final String extension)
list File 
if (!new File(path).isDirectory()) {
    throw new IllegalArgumentException("Path " + path + " is not a directory");
final List<String> files = new ArrayList<>();
Files.walk(Paths.get(path)).filter(Files::isRegularFile)
        .filter((p) -> p.toFile().getAbsolutePath().endsWith(extension))
        .forEach(p -> files.add(p.toString()));
return files;
...
ListlistFiles(final Path path, final String... extensions)
List all files with extension 
return Files.list(path).filter(child -> {
    if (extensions.length > 0) {
        for (String extension : extensions) {
            if (child.getFileName().toString().endsWith(extension)) {
                return true;
        return false;
...
String[]listFiles(String path, String extension)
list Files 
String[] paths = EMPTY_FILE_LIST;
if (path.endsWith("**")) {
    String dir = path.substring(0, path.length() - 2);
    if (Paths.get(dir).toFile().isDirectory()) {
        paths = listFiles(dir, extension, true);
    } else if (!Paths.get(dir).toFile().exists()) {
        throw new IOException("Directory " + dir + " does not exist");
} else if (path.endsWith("*")) {
    String dir = path.substring(0, path.length() - 1);
    if (Paths.get(dir).toFile().isDirectory()) {
        paths = listFiles(dir, extension, false);
    } else if (!Paths.get(dir).toFile().exists()) {
        throw new IOException("Directory " + dir + " does not exist");
} else {
    paths = getSingleFile(path, extension);
return paths;
StringremoveExtension(final Path path)
remove Extension 
final Path fileName = path.getFileName();
if (fileName == null)
    throw new IllegalArgumentException();
final String n = fileName.toString();
final int i = n.lastIndexOf('.');
return i == -1 ? n : n.substring(0, i);
PathremoveExtension(Path file)
Remove the extension information from the path. 
Predicate<Path> filter = path -> {
    try {
        return !Files.isDirectory(path) && !Files.isHidden(path);
    } catch (IOException e) {
        throw new RuntimeException(e);
};
Function<Path, Path> removeExtensionFunction = path -> {
...
StringreplaceExtensionWith(String toFilePath, String newExtension)
replace Extension With 
String dirname = toFilePath.substring(0, toFilePath.lastIndexOf(File.separatorChar) + 1);
String filename = toFilePath.substring(toFilePath.lastIndexOf(File.separatorChar) + 1, toFilePath.length());
String basename = filename.contains(".") ? filename.substring(0, filename.lastIndexOf('.') + 1)
        : (filename + ".");
return Paths.get(dirname, basename + newExtension).toString();
StringstripExtension(Path path, String extension)
strip Extension 
String fileName = path.toString();
return fileName.substring(0, fileName.toLowerCase().indexOf(extension));