in src/main/java/org/apache/commons/validator/routines/UrlValidator.java [358:385]
public boolean isValid(final String value) {
if (value == null) {
return false;
}
final URI uri; // ensure value is a valid URI
try {
uri = new URI(value);
} catch (final URISyntaxException e) {
return false;
}
// OK, perform additional validation
final String scheme = uri.getScheme();
if (!isValidScheme(scheme)) {
return false;
}
final String authority = uri.getRawAuthority();
if ("file".equals(scheme) && GenericValidator.isBlankOrNull(authority)) { // Special case - file: allows an empty authority
return true; // this is a local file - nothing more to do here
}
// Validate the authority
if ("file".equals(scheme) && authority != null && authority.contains(":") || !isValidAuthority(authority)) {
return false;
}
if (!isValidPath(uri.getRawPath()) || !isValidQuery(uri.getRawQuery()) || !isValidFragment(uri.getRawFragment())) {
return false;
}
return true;
}