Class DomainValidator

java.lang.Object
org.apache.commons.validator.routines.DomainValidator
All Implemented Interfaces:
Serializable
public class DomainValidator extends Object implements Serializable

Domain name validation routines.

This validator provides methods for validating Internet domain names and top-level domains.

Domain names are evaluated according to the standards RFC1034, section 3, and RFC1123, section 2.1. No accommodation is provided for the specialized needs of other applications; if the domain name has been URL-encoded, for example, validation will fail even though the equivalent plaintext version of the same name would have passed.

Validation is also provided for top-level domains (TLDs) as defined and maintained by the Internet Assigned Numbers Authority (IANA):

(NOTE: This class does not provide IP address lookup for domain names or methods to ensure that a given domain name matches a specific IP; see InetAddress for that functionality.)

Since:
1.4
See Also:

  • Method Details

    • getInstance

      public static DomainValidator getInstance()
      Gets the singleton instance of this validator. It will not consider local addresses as valid.
      Returns:
      the singleton instance of this validator.

    • getInstance

      public static DomainValidator getInstance(boolean allowLocal)
      Gets the singleton instance of this validator, with local validation as required.
      Parameters:
      allowLocal - Whether local addresses are considered valid.
      Returns:
      the singleton instance of this validator.

    • getInstance

      public static DomainValidator getInstance(boolean allowLocal, List<DomainValidator.Item> items)
      Gets a new instance of this validator. The user can provide a list of DomainValidator.Item entries which can be used to override the generic and country code lists. Note that any such entries override values provided by the updateTLDOverride(ArrayType, String[]) method If an entry for a particular type is not provided, then the class override (if any) is retained.
      Parameters:
      allowLocal - Whether local addresses are considered valid.
      items - array of DomainValidator.Item entries.
      Returns:
      an instance of this validator.
      Since:
      1.7

    • getTLDEntries

      public static String[] getTLDEntries(DomainValidator.ArrayType table)
      Gets a copy of a class level internal array.
      Parameters:
      table - the array type (any of the enum values).
      Returns:
      a copy of the array.
      Throws:
      IllegalArgumentException - if the table type is unexpected (should not happen).
      Since:
      1.5.1

    • updateTLDOverride

      public static void updateTLDOverride(DomainValidator.ArrayType table, String... tlds)
      Updates one of the TLD override arrays. This must only be done at program startup, before any instances are accessed using getInstance.

      For example:

      DomainValidator.updateTLDOverride(ArrayType.GENERIC_PLUS, "apache")

      To clear an override array, provide an empty array.

      Parameters:
      table - the table to update, see DomainValidator.ArrayType Must be one of the following
      • COUNTRY_CODE_MINUS
      • COUNTRY_CODE_PLUS
      • GENERIC_MINUS
      • GENERIC_PLUS
      • LOCAL_MINUS
      • LOCAL_PLUS
      tlds - the array of TLDs, must not be null.
      Throws:
      IllegalStateException - if the method is called after getInstance.
      IllegalArgumentException - if one of the read-only tables is requested.
      Since:
      1.5.0

    • getOverrides

      public String[] getOverrides(DomainValidator.ArrayType table)
      Gets a copy of an instance level internal array.
      Parameters:
      table - the array type (any of the enum values).
      Returns:
      a copy of the array.
      Throws:
      IllegalArgumentException - if the table type is unexpected, for example, GENERIC_RO.
      Since:
      1.7

    • isAllowLocal

      public boolean isAllowLocal()
      Tests whether this instance allow local addresses.
      Returns:
      true if local addresses are allowed.
      Since:
      1.7

    • isValid

      public boolean isValid(String domain)
      Tests whether the specified String parses as a valid domain name with a recognized top-level domain. The parsing is case-insensitive.
      Parameters:
      domain - the parameter to check for domain name syntax.
      Returns:
      true if the parameter is a valid domain name.

    • isValidCountryCodeTld

      public boolean isValidCountryCodeTld(String ccTld)
      Tests whether the specified String matches any IANA-defined country code top-level domain. Leading dots are ignored if present. The search is case-insensitive.
      Parameters:
      ccTld - the parameter to check for country code TLD status, not null.
      Returns:
      true if the parameter is a country code TLD.

    • isValidGenericTld

      public boolean isValidGenericTld(String gTld)
      Tests whether the specified String matches any IANA-defined generic top-level domain. Leading dots are ignored if present. The search is case-insensitive.
      Parameters:
      gTld - the parameter to check for generic TLD status, not null.
      Returns:
      true if the parameter is a generic TLD.

    • isValidInfrastructureTld

      public boolean isValidInfrastructureTld(String iTld)
      Tests whether the specified String matches any IANA-defined infrastructure top-level domain. Leading dots are ignored if present. The search is case-insensitive.
      Parameters:
      iTld - the parameter to check for infrastructure TLD status, not null.
      Returns:
      true if the parameter is an infrastructure TLD.

    • isValidLocalTld

      public boolean isValidLocalTld(String lTld)
      Tests whether the specified String matches any widely used "local" domains (localhost or localdomain). Leading dots are ignored if present. The search is case-insensitive.
      Parameters:
      lTld - the parameter to check for local TLD status, not null.
      Returns:
      true if the parameter is a local TLD.

    • isValidTld

      public boolean isValidTld(String tld)
      Returns true if the specified String matches any IANA-defined top-level domain. Leading dots are ignored if present. The search is case-insensitive.

      If allowLocal is true, the TLD is checked using isValidLocalTld(String). The TLD is then checked against isValidInfrastructureTld(String), isValidGenericTld(String) and isValidCountryCodeTld(String).

      Parameters:
      tld - the parameter to check for TLD status, not null.
      Returns:
      true if the parameter is a TLD.