Java Utililty Methods URI Value Check

List of utility methods to do URI Value Check

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Description

The list of methods to do URI Value Check are organized into topic(s).

Method

booleanisFile(final URI uri)
Is the URI representing a file?? 
if ((uri != null) && (uri.getScheme() != null)) {
    return uri.getScheme().equalsIgnoreCase("file");
return false;
booleanisFile(URI uri)
is File 
return "file".equals(uri.getScheme()) || !uri.isAbsolute();
booleanisFile(URI uri)
If there is a file at the other end of this URI return true. 
if (uri.getScheme().equals(PROTOCOL_FILE)) {
    return new File(uri.getPath()).isFile();
try {
    uri.toURL().openStream().close();
    return true;
} catch (IOException ex) {
    return false;
...
booleanisFileSystemAvailable(File file, URI topLevelResource)
Determines via best effort if the file system on which the file resides is available. 
File topLevel = new File(topLevelResource);
if (isEqualPath(file, topLevel)) {
    return file.exists();
return isFileSystemAvailable(file, topLevel);
booleanisFileUri(String uri)
is File Uri 
String scheme = (new URI(uri)).getScheme();
if (scheme != null)
    return scheme.toLowerCase().equals(FILE);
return false;
booleanisFileURI(URI uri)
Returns whether the given URI refers to a local file system URI. 
return SCHEME_FILE.equalsIgnoreCase(uri.getScheme());
booleanisFileURI(URI uri)
Returns whether the given uri is a file URI as returned, e.g., by a File. 
return null != uri && "file".equals(uri.getScheme());
booleanisFileUri(URI uri)
is File Uri 
if (uri == null) {
    return false;
return "file".equals(uri.getScheme());
booleanisFtp(URI uri)
check if URI scheme is ftp 
if ("ftp".equals(uri.getScheme())) {
    return true;
return false;
booleanisHostDnsName(URI uri)
Returns a boolean indicating whether the host of the specified URI is DNS. 
String host = uri.getHost();
for (int i = 0; i < host.length(); i++) {
    char hostChar = host.charAt(i);
    if (!Character.isDigit(hostChar) && !(hostChar == '.')) {
        return true;
return false;
...