Package com.google.common.net

Class HostAndPort

  • All Implemented Interfaces:
    Serializable
    @Immutable
@GwtCompatible
public final class HostAndPort
extends Object
implements Serializable
    An immutable representation of a host and port.

    Example usage: 

     HostAndPort hp = HostAndPort.fromString("[2001:db8::1]")
     .withDefaultPort(80)
     .requireBracketsForIPv6();
 hp.getHost();   // returns "2001:db8::1"
 hp.getPort();   // returns 80
 hp.toString();  // returns "[2001:db8::1]:80"

    Here are some examples of recognized formats:

    Note that this is not an exhaustive list, because these methods are only concerned with brackets, colons, and port numbers. Full validation of the host field (if desired) is the caller's responsibility.

    Since:
    10.0
    Author:
    Paul Marks
    See Also:
    Serialized Form

    • Method Detail

      • getHost

        public String getHost()
        Returns the portion of this HostAndPort instance that should represent the hostname or IPv4/IPv6 literal.

        A successful parse does not imply any degree of sanity in this field. For additional validation, see the HostSpecifier class.

        Since:
        20.0 (since 10.0 as getHostText)

      • hasPort

        public boolean hasPort()
        Return true if this instance has a defined port.

      • getPort

        public int getPort()
        Get the current port number, failing if no port is defined.
        Returns:
        a validated port number, in the range [0..65535]
        Throws:
        IllegalStateException - if no port is defined. You can use withDefaultPort(int) to prevent this from occurring.

      • getPortOrDefault

        public int getPortOrDefault​(int defaultPort)
        Returns the current port number, with a default if no port is defined.

      • fromParts

        public static HostAndPort fromParts​(String host,
                                    int port)
        Build a HostAndPort instance from separate host and port values.

        Note: Non-bracketed IPv6 literals are allowed. Use requireBracketsForIPv6() to prohibit these.

        Parameters:
        host - the host string to parse. Must not contain a port number.
        port - a port number from [0..65535]
        Returns:
        if parsing was successful, a populated HostAndPort object.
        Throws:
        IllegalArgumentException - if host contains a port number, or port is out of range.

      • fromHost

        public static HostAndPort fromHost​(String host)
        Build a HostAndPort instance from a host only.

        Note: Non-bracketed IPv6 literals are allowed. Use requireBracketsForIPv6() to prohibit these.

        Parameters:
        host - the host-only string to parse. Must not contain a port number.
        Returns:
        if parsing was successful, a populated HostAndPort object.
        Throws:
        IllegalArgumentException - if host contains a port number.
        Since:
        17.0

      • fromString

        @CanIgnoreReturnValue
public static HostAndPort fromString​(String hostPortString)
        Split a freeform string into a host and port, without strict validation.

        Note that the host-only formats will leave the port field undefined. You can use withDefaultPort(int) to patch in a default value.

        Parameters:
        hostPortString - the input string to parse.
        Returns:
        if parsing was successful, a populated HostAndPort object.
        Throws:
        IllegalArgumentException - if nothing meaningful could be parsed.

      • withDefaultPort

        public HostAndPort withDefaultPort​(int defaultPort)
        Provide a default port if the parsed string contained only a host.

        You can chain this after fromString(String) to include a port in case the port was omitted from the input string. If a port was already provided, then this method is a no-op.

        Parameters:
        defaultPort - a port number, from [0..65535]
        Returns:
        a HostAndPort instance, guaranteed to have a defined port.

      • requireBracketsForIPv6

        @CanIgnoreReturnValue
public HostAndPort requireBracketsForIPv6()
        Generate an error if the host might be a non-bracketed IPv6 literal.

        URI formatting requires that IPv6 literals be surrounded by brackets, like "[2001:db8::1]". Chain this call after fromString(String) to increase the strictness of the parser, and disallow IPv6 literals that don't contain these brackets.

        Note that this parser identifies IPv6 literals solely based on the presence of a colon. To perform actual validation of IP addresses, see the InetAddresses.forString(String) method.

        Returns:
        this, to enable chaining of calls.
        Throws:
        IllegalArgumentException - if bracketless IPv6 is detected.