Package com.google.common.primitives

Class SignedBytes

  • @GwtCompatible
public final class SignedBytes
extends java.lang.Object
    Static utility methods pertaining to byte primitives that interpret values as signed. The corresponding methods that treat the values as unsigned are found in UnsignedBytes, and the methods for which signedness is not an issue are in Bytes.

    See the Guava User Guide article on primitive utilities.

    Since:
    1.0

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static byte MAX_POWER_OF_TWO
      The largest power of two that can be represented as a signed byte.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static byte checkedCast​(long value)
      Returns the byte value that is equal to value, if possible.
      static int compare​(byte a, byte b)
      Compares the two specified byte values.
      static java.lang.String join​(java.lang.String separator, byte... array)
      Returns a string containing the supplied byte values separated by separator.
      static java.util.Comparator<byte[]> lexicographicalComparator()
      Returns a comparator that compares two byte arrays lexicographically.
      static byte max​(byte... array)
      Returns the greatest value present in array.
      static byte min​(byte... array)
      Returns the least value present in array.
      static byte saturatedCast​(long value)
      Returns the byte nearest in value to value.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • MAX_POWER_OF_TWO

        public static final byte MAX_POWER_OF_TWO
        The largest power of two that can be represented as a signed byte.
        Since:
        10.0
        See Also:
        Constant Field Values

    • Method Detail

      • checkedCast

        public static byte checkedCast​(long value)
        Returns the byte value that is equal to value, if possible.
        Parameters:
        value - any value in the range of the byte type
        Returns:
        the byte value that equals value
        Throws:
        java.lang.IllegalArgumentException - if value is greater than Byte.MAX_VALUE or less than Byte.MIN_VALUE

      • saturatedCast

        public static byte saturatedCast​(long value)
        Returns the byte nearest in value to value.
        Parameters:
        value - any long value
        Returns:
        the same value cast to byte if it is in the range of the byte type, Byte.MAX_VALUE if it is too large, or Byte.MIN_VALUE if it is too small

      • compare

        public static int compare​(byte a,
                          byte b)
        Compares the two specified byte values. The sign of the value returned is the same as that of ((Byte) a).compareTo(b).

        Note: this method behaves identically to the JDK 7 method Byte.compare(byte, byte).

        Parameters:
        a - the first byte to compare
        b - the second byte to compare
        Returns:
        a negative value if a is less than b; a positive value if a is greater than b; or zero if they are equal

      • min

        public static byte min​(byte... array)
        Returns the least value present in array.
        Parameters:
        array - a nonempty array of byte values
        Returns:
        the value present in array that is less than or equal to every other value in the array
        Throws:
        java.lang.IllegalArgumentException - if array is empty

      • max

        public static byte max​(byte... array)
        Returns the greatest value present in array.
        Parameters:
        array - a nonempty array of byte values
        Returns:
        the value present in array that is greater than or equal to every other value in the array
        Throws:
        java.lang.IllegalArgumentException - if array is empty

      • join

        public static java.lang.String join​(java.lang.String separator,
                                    byte... array)
        Returns a string containing the supplied byte values separated by separator. For example, join(":", 0x01, 0x02, -0x01) returns the string "1:2:-1".
        Parameters:
        separator - the text that should appear between consecutive values in the resulting string (but not at the start or end)
        array - an array of byte values, possibly empty

      • lexicographicalComparator

        public static java.util.Comparator<byte[]> lexicographicalComparator()
        Returns a comparator that compares two byte arrays lexicographically. That is, it compares, using compare(byte, byte)), 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, [] < [0x01] < [0x01, 0x80] < [0x01, 0x7F] < [0x02]. Values are treated as signed.

        The returned comparator is inconsistent with Object.equals(Object) (since arrays support only identity equality), but it is consistent with Arrays.equals(byte[], byte[]).

        Since:
        2.0
        See Also:
        Lexicographical order article at Wikipedia