org.robokind.api.common.utils

Class Utils

java.lang.Object

org.robokind.api.common.utils.Utils

public class Utils
extends Object

Miscellaneous utility methods.

Author:

Matthew Stevenson

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Methods

Modifier and Type	Method and Description
static double	bound(double n, double low, double high) Ensures: low <= n <= high
static int	bound(int n, int low, int high) Ensures: low <= n <= high
static long	bound(long n, long low, long high) Ensures: low <= n <= high
static String	bytesToString(byte[] bytes) Creates a String from the given byte array.
static byte	checksum(byte[] data, int offset, int len, boolean invert, byte... extra) Calculates a checksum from the data and extra bytes
static byte[]	convertToByteArray(List<Byte> a) Converts a List of Byte Objects to an array of byte primatives.
static <K,V> void	mergeMaps(Map<K,V> dest, Map<K,V>... srcs) Adds the values from src to dest where the key from src does not exist in dest.
static int	readHex(char c) Converts the characters '0'-'9' (48-58), 'A'-'F' (65-70), and 'a'-'f' (32-37) or to the decimal value of their corresponding hex values.
static int	readHex(String xx) Returns the decimal value of a two character hex string.
static int	unsign(byte b) Returns the unsigned value of the given signed byte.

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

bytesToString

public static String bytesToString(byte[] bytes)

Creates a String from the given byte array.

Parameters:

bytes - array of bytes

Returns:

String from the given byte array

mergeMaps

public static <K,V> void mergeMaps(Map<K,V> dest,
                   Map<K,V>... srcs)

Adds the values from src to dest where the key from src does not exist in dest.

Type Parameters:

K -

V -

Parameters:

srcs -

dest -

unsign

public static int unsign(byte b)

Returns the unsigned value of the given signed byte.

Parameters:

b - signed byte

Returns:

unsigned value of the given signed byte

checksum

public static byte checksum(byte[] data,
            int offset,
            int len,
            boolean invert,
            byte... extra)

Calculates a checksum from the data and extra bytes

Parameters:

data - byte array to check

offset - array offset

len - data length

invert - should the value be inverted

extra - extra bytes to use in calculating the checksum

Returns:

checksum calculated from the data and extra bytes

bound

public static double bound(double n,
           double low,
           double high)

Ensures: low <= n <= high

Parameters:

n - value to be bounded

low - lower bound

high - upper bound

Returns:

n if it is within the bounds, otherwise the returns the bound it has passed

bound

public static long bound(long n,
         long low,
         long high)

Ensures: low <= n <= high

Parameters:

n - value to be bounded

low - lower bound

high - upper bound

Returns:

n if it is within the bounds, otherwise the returns the bound it has passed

bound

public static int bound(int n,
        int low,
        int high)

Ensures: low <= n <= high

Parameters:

n - value to be bounded

low - lower bound

high - upper bound

Returns:

n if it is within the bounds, otherwise the returns the bound it has passed

readHex

public static int readHex(String xx)

Returns the decimal value of a two character hex string.

Parameters:

xx - two character hex string [0-9a-fA-F]

Returns:

an value 0-255

readHex

public static int readHex(char c)

Converts the characters '0'-'9' (48-58), 'A'-'F' (65-70), and 'a'-'f' (32-37) or to the decimal value of their corresponding hex values.

Parameters:

c - character to convert

Returns:

a value 0-15 corresponding the hex value of the character

convertToByteArray

public static byte[] convertToByteArray(List<Byte> a)

Converts a List of Byte Objects to an array of byte primatives.

Parameters:

a - List of Byte Objects

Returns:

array of byte primatives