Class HostAndPort
- java.lang.Object
-
- com.google.common.net.HostAndPort
-
- All Implemented Interfaces:
java.io.Serializable
public final class HostAndPort extends java.lang.Object implements java.io.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:
- example.com
- example.com:80
- 192.0.2.1
- 192.0.2.1:80
- [2001:db8::1] -
getHost()
omits brackets - [2001:db8::1]:80 -
getHost()
omits brackets - 2001:db8::1 - Use
requireBracketsForIPv6()
to prohibit this
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
- See Also:
- Serialized Form
-
-
Field Summary
Fields Modifier and Type Field Description private boolean
hasBracketlessColons
True if the parsed host has colons, but no surrounding brackets.private java.lang.String
host
Hostname, IPv4/IPv6 literal, or unvalidated nonsense.private static int
NO_PORT
Magic value indicating the absence of a port number.private int
port
Validated port number in the range [0..65535], or NO_PORTprivate static long
serialVersionUID
-
Constructor Summary
Constructors Modifier Constructor Description private
HostAndPort(java.lang.String host, int port, boolean hasBracketlessColons)
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(java.lang.Object other)
static HostAndPort
fromHost(java.lang.String host)
Build a HostAndPort instance from a host only.static HostAndPort
fromParts(java.lang.String host, int port)
Build a HostAndPort instance from separate host and port values.static HostAndPort
fromString(java.lang.String hostPortString)
Split a freeform string into a host and port, without strict validation.java.lang.String
getHost()
Returns the portion of thisHostAndPort
instance that should represent the hostname or IPv4/IPv6 literal.private static java.lang.String[]
getHostAndPortFromBracketedHost(java.lang.String hostPortString)
Parses a bracketed host-port string, throwing IllegalArgumentException if parsing fails.int
getPort()
Get the current port number, failing if no port is defined.int
getPortOrDefault(int defaultPort)
Returns the current port number, with a default if no port is defined.int
hashCode()
boolean
hasPort()
Return true if this instance has a defined port.private static boolean
isValidPort(int port)
Return true for valid port numbers.HostAndPort
requireBracketsForIPv6()
Generate an error if the host might be a non-bracketed IPv6 literal.java.lang.String
toString()
Rebuild the host:port string, including brackets if necessary.HostAndPort
withDefaultPort(int defaultPort)
Provide a default port if the parsed string contained only a host.
-
-
-
Field Detail
-
NO_PORT
private static final int NO_PORT
Magic value indicating the absence of a port number.- See Also:
- Constant Field Values
-
host
private final java.lang.String host
Hostname, IPv4/IPv6 literal, or unvalidated nonsense.
-
port
private final int port
Validated port number in the range [0..65535], or NO_PORT
-
hasBracketlessColons
private final boolean hasBracketlessColons
True if the parsed host has colons, but no surrounding brackets.
-
serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
-
-
Method Detail
-
getHost
public java.lang.String getHost()
Returns the portion of thisHostAndPort
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:
java.lang.IllegalStateException
- if no port is defined. You can usewithDefaultPort(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(java.lang.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:
java.lang.IllegalArgumentException
- ifhost
contains a port number, orport
is out of range.
-
fromHost
public static HostAndPort fromHost(java.lang.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:
java.lang.IllegalArgumentException
- ifhost
contains a port number.- Since:
- 17.0
-
fromString
public static HostAndPort fromString(java.lang.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:
java.lang.IllegalArgumentException
- if nothing meaningful could be parsed.
-
getHostAndPortFromBracketedHost
private static java.lang.String[] getHostAndPortFromBracketedHost(java.lang.String hostPortString)
Parses a bracketed host-port string, throwing IllegalArgumentException if parsing fails.- Parameters:
hostPortString
- the full bracketed host-port specification. Post might not be specified.- Returns:
- an array with 2 strings: host and port, in that order.
- Throws:
java.lang.IllegalArgumentException
- if parsing the bracketed host-port string fails.
-
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
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:
java.lang.IllegalArgumentException
- if bracketless IPv6 is detected.
-
equals
public boolean equals(java.lang.Object other)
- Overrides:
equals
in classjava.lang.Object
-
hashCode
public int hashCode()
- Overrides:
hashCode
in classjava.lang.Object
-
toString
public java.lang.String toString()
Rebuild the host:port string, including brackets if necessary.- Overrides:
toString
in classjava.lang.Object
-
isValidPort
private static boolean isValidPort(int port)
Return true for valid port numbers.
-
-