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java.lang.Objectcom.google.common.primitives.UnsignedLongs
@Beta @GwtCompatible public final class UnsignedLongs
Static utility methods pertaining to long primitives that interpret values as
unsigned (that is, any negative value x is treated as the positive value
2^64 + x). The methods for which signedness is not an issue are in Longs, as
well as signed versions of methods for which signedness is an issue.
In addition, this class provides several static methods for converting a long to a
String and a String to a long that treat the long as an unsigned
number.
Users of these utilities must be extremely careful not to mix up signed and unsigned
long values. When possible, it is recommended that the UnsignedLong wrapper
class be used, at a small efficiency penalty, to enforce the distinction in the type system.
| Field Summary | |
|---|---|
static long |
MAX_VALUE
|
| Method Summary | |
|---|---|
static int |
compare(long a,
long b)
Compares the two specified long values, treating them as unsigned values between
0 and 2^64 - 1 inclusive. |
static long |
divide(long dividend,
long divisor)
Returns dividend / divisor, where the dividend and divisor are treated as unsigned 64-bit quantities. |
static String |
join(String separator,
long... array)
Returns a string containing the supplied unsigned long values separated by
separator. |
static Comparator<long[]> |
lexicographicalComparator()
Returns a comparator that compares two arrays of unsigned long values
lexicographically. |
static long |
max(long... array)
Returns the greatest value present in array, treating values as unsigned. |
static long |
min(long... array)
Returns the least value present in array, treating values as unsigned. |
static long |
parseUnsignedLong(String s)
Returns the unsigned long value represented by the given decimal string. |
static long |
parseUnsignedLong(String s,
int radix)
Returns the unsigned long value represented by a string with the given radix. |
static long |
remainder(long dividend,
long divisor)
Returns dividend % divisor, where the dividend and divisor are treated as unsigned 64-bit quantities. |
static String |
toString(long x)
Returns a string representation of x, where x is treated as unsigned. |
static String |
toString(long x,
int radix)
Returns a string representation of x for the given radix, where x is treated
as unsigned. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
public static final long MAX_VALUE
| Method Detail |
|---|
public static int compare(long a,
long b)
long values, treating them as unsigned values between
0 and 2^64 - 1 inclusive.
a - the first unsigned long to compareb - the second unsigned long to compare
a is less than b; a positive value if a is
greater than b; or zero if they are equalpublic static long min(long... array)
array, treating values as unsigned.
array - a nonempty array of unsigned long values
array that is less than or equal to every other value in
the array according to compare(long, long)
IllegalArgumentException - if array is emptypublic static long max(long... array)
array, treating values as unsigned.
array - a nonempty array of unsigned long values
array that is greater than or equal to every other value
in the array according to compare(long, long)
IllegalArgumentException - if array is empty
public static String join(String separator,
long... array)
long values separated by
separator. For example, join("-", 1, 2, 3) returns the string "1-2-3".
separator - the text that should appear between consecutive values in the resulting
string (but not at the start or end)array - an array of unsigned long values, possibly emptypublic static Comparator<long[]> lexicographicalComparator()
long values
lexicographically. That is, it compares, using compare(long, long)), the first pair of
values that follow any common prefix, or when one array is a prefix of the other, treats the
shorter array as the lesser. For example, [] < [1L] < [1L, 2L] < [2L] < [1L << 63].
The returned comparator is inconsistent with Object.equals(Object) (since arrays
support only identity equality), but it is consistent with
Arrays.equals(long[], long[]).
public static long divide(long dividend,
long divisor)
dividend - the dividend (numerator)divisor - the divisor (denominator)
ArithmeticException - if divisor is 0
public static long remainder(long dividend,
long divisor)
dividend - the dividend (numerator)divisor - the divisor (denominator)
ArithmeticException - if divisor is 0public static long parseUnsignedLong(String s)
long value represented by the given decimal string.
NumberFormatException - if the string does not contain a valid unsigned long
value
public static long parseUnsignedLong(String s,
int radix)
long value represented by a string with the given radix.
s - the string containing the unsigned long representation to be parsed.radix - the radix to use while parsing s
NumberFormatException - if the string does not contain a valid unsigned long
with the given radix, or if radix is not between Character.MIN_RADIX
and Character.MAX_RADIX.public static String toString(long x)
public static String toString(long x,
int radix)
x for the given radix, where x is treated
as unsigned.
x - the value to convert to a string.radix - the radix to use while working with x
IllegalArgumentException - if radix is not between Character.MIN_RADIX
and Character.MAX_RADIX.
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