Class HostSpecifier

java.lang.Object
com.google.common.net.HostSpecifier
@GwtIncompatible public final class HostSpecifier extends Object
A syntactically valid host specifier, suitable for use in a URI. This may be either a numeric IP address in IPv4 or IPv6 notation, or a domain name.

Because this class is intended to represent host specifiers which can reasonably be used in a URI, the domain name case is further restricted to include only those domain names which end in a recognized public suffix; see InternetDomainName.isPublicSuffix() for details.

Note that no network lookups are performed by any HostSpecifier methods. No attempt is made to verify that a provided specifier corresponds to a real or accessible host. Only syntactic and pattern-based checks are performed.

If you know that a given string represents a numeric IP address, use InetAddresses to obtain and manipulate a InetAddress instance from it rather than using this class. Similarly, if you know that a given string represents a domain name, use InternetDomainName rather than this class.

Since:
5.0
Author:
Craig Berry

  • Method Details

    • fromValid

      public static HostSpecifier fromValid(String specifier)
      Returns a HostSpecifier built from the provided specifier, which is already known to be valid. If the specifier might be invalid, use from(String) instead.

      The specifier must be in one of these formats:

      • A domain name, like google.com
      • A IPv4 address string, like 127.0.0.1
      • An IPv6 address string with or without brackets, like [2001:db8::1] or 2001:db8::1
      Throws:
      IllegalArgumentException - if the specifier is not valid.

    • from

      @CanIgnoreReturnValue public static HostSpecifier from(String specifier) throws ParseException
      Attempts to return a HostSpecifier for the given string, throwing an exception if parsing fails. Always use this method in preference to fromValid(String) for a specifier that is not already known to be valid.
      Throws:
      ParseException - if the specifier is not valid.

    • isValid

      public static boolean isValid(String specifier)
      Determines whether specifier represents a valid HostSpecifier as described in the documentation for fromValid(String).

    • equals

      public boolean equals(@Nullable Object other)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Returns a string representation of the host specifier suitable for inclusion in a URI. If the host specifier is a domain name, the string will be normalized to all lower case. If the specifier was an IPv6 address without brackets, brackets are added so that the result will be usable in the host part of a URI.
      Overrides:
      toString in class Object