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

IterableasPaths(final Iterable files)
as Paths 
return () -> new Iterator<Path>() {
    Iterator<? extends File> iter = files.iterator();
    @Override
    public boolean hasNext() {
        return iter.hasNext();
    @Override
    public Path next() {
...
PathchangeExtension(Path source, String extension)
change Extension 
String newFileName = changeExtension(extension, source.getFileName().toString());
return source.getParent().resolve(newFileName);
PathchangeFileExtension(Path fileName, String extension)
change File Extension 
String name = fileName.getFileName().toString();
int length = name.length();
String nameWithoutExt = name.substring(0, length - 3);
return Paths.get(nameWithoutExt.concat(extension));
StringfileExtension(final Path thePath)
Gets the extension of the given file. 
if (thePath == null)
    return null;
if (thePath.getFileName() == null)
    return null;
String myPathString = thePath.getFileName().toString();
if (myPathString.lastIndexOf(".") < 0)
    return null;
return myPathString.substring(myPathString.lastIndexOf(".") + 1, myPathString.length());
...
FunctionfileRenamer(final String fromPath, final String toPath, @Nullable final String toExtension, final boolean junkPaths)
file Renamer 
return new Function<String, String>() {
    @Override
    public String apply(final String path) {
        String name;
        if (!path.startsWith(fromPath) || junkPaths) {
            name = Paths.get(path).getFileName().toString();
        } else {
            name = path.substring(fromPath.length());
...
ListfindFilesWithExtension(Path directory, String targetExtension)
Traverses a directory to find the list of files with the target extension 
List<Path> files = new ArrayList<>();
try (DirectoryStream<Path> ds = Files.newDirectoryStream(directory)) {
    for (Iterator<Path> it = ds.iterator(); it.hasNext();) {
        Path file = (Path) it.next();
        String extension = getExtension(file).toLowerCase();
        if (extension.equals(targetExtension.toLowerCase())) {
            files.add(file);
        } else {
...
ListgetAllPaths(Path root, final String... extensions)
get All Paths 
List<Path> l = new ArrayList<>();
getAllPaths(l, root, extensions);
return l;
StringgetExtension(final Path path)
get Extension 
int i = path.toString().lastIndexOf(".");
if (i >= 0) {
    return path.toString().substring(i + 1);
return "";
StringgetExtension(Path file)
Gets the extension of a file 
String fullFilename = file.getFileName().toString();
String[] tokens = fullFilename.split("\\.");
if (tokens.length <= 1) {
    return fullFilename;
return tokens[tokens.length - 1];
StringgetExtension(Path path)
get Extension 
return getExtension(path != null ? path.toString() : null);