net.sergeych.tools

Class Do

java.lang.Object

net.sergeych.tools.Do

public class Do
extends java.lang.Object

Created by sergeych on 15/02/16.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Do.Action Interface to single method with no parameters throwing exception.
static interface	Do.Task<T>
static interface	Do.TaskWithoutResult

Constructor Summary

Constructors

Constructor and Description
Do()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	bytesToHex(byte[] bytes)
static <A,B> A	checkSame(A oldValue, B newValue, java.lang.Runnable onChanged)
static <T> java.util.Collection<T>	collection(java.lang.Object x)
static byte[]	decodeBase64(java.lang.String base64)
static boolean	deepEqualityTest(java.lang.Object a, java.lang.Object b)
static void	delay(long millis, Do.Action action)
static java.security.SecureRandom	getRng()
static DeferredResult	inParallel(Do.Task task) Immediately start specified task (e.g.
static DeferredResult	inParallel(Do.TaskWithoutResult task)
static void	later(Do.Action action)
static <T,U> java.util.ArrayList<T>	list(U x) Convert native array or some collection fo list
static <T,U> java.util.ArrayList<T>	listOf(U... objects)
static java.util.HashMap<java.lang.String,java.lang.Object>	map(java.lang.Object... args) Convert "key, value" pairs from varargs into a Map.
static byte[]	randomBytes(int length) Get a sequence of random bytes using SecureRandom.
static int	randomInt(int max) get the next integer in [0,max[ (max exclusive, zero inclusive) range using SecureRandom generator
static int	randomIntInRange(int inclusiveMinimum, int inclusiveMaximum)
static byte[]	randomNegativeBytes(int length) Get a sequence of random negative bytes using SecureRandom, useful to test errors
static byte[]	read(java.io.File f)
static byte[]	read(java.io.InputStream inputStream)
static byte[]	read(java.lang.String fileName)
static java.lang.String	readToString(java.io.InputStream inputStream)
static <T> T	sample(java.util.Collection source) Get a random item of the collection.
static java.lang.String	snakeToCamelCase(java.lang.String snakeString) Convert a snake_case_string to CamelCaseString.

Methods inherited from class java.lang.Object

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

Constructor Detail

Do

public Do()

Method Detail

read

public static byte[] read(java.lang.String fileName)
                   throws java.io.IOException

Throws:

java.io.IOException

read

public static byte[] read(java.io.InputStream inputStream)
                   throws java.io.IOException

Throws:

java.io.IOException

readToString

public static java.lang.String readToString(java.io.InputStream inputStream)
                                     throws java.io.IOException

Throws:

java.io.IOException

checkSame

public static <A,B> A checkSame(A oldValue,
                                B newValue,
                                java.lang.Runnable onChanged)

sample

public static <T> T sample(java.util.Collection source)

Get a random item of the collection. Effectively process RandomAccess enablied List collections. For other types of collections converts i to an array which might require further optimization.

Parameters:

source - collection

Returns:

random item. null if the collection is empty.

getRng

public static java.security.SecureRandom getRng()

randomInt

public static int randomInt(int max)

get the next integer in [0,max[ (max exclusive, zero inclusive) range using SecureRandom generator

Parameters:

max -

Returns:

randomBytes

public static byte[] randomBytes(int length)

Get a sequence of random bytes using SecureRandom.

Parameters:

length - array length

Returns:

random bytes array

randomNegativeBytes

public static byte[] randomNegativeBytes(int length)

Get a sequence of random negative bytes using SecureRandom, useful to test errors

Parameters:

length - array length

Returns:

random bytes array

randomIntInRange

public static int randomIntInRange(int inclusiveMinimum,
                                   int inclusiveMaximum)

read

public static byte[] read(java.io.File f)
                   throws java.io.IOException

Throws:

java.io.IOException

delay

public static void delay(long millis,
                         Do.Action action)

later

public static void later(Do.Action action)

map

public static java.util.HashMap<java.lang.String,java.lang.Object> map(java.lang.Object... args)

Convert "key, value" pairs from varargs into a Map.

Parameters:

args - key, value pairs.Can be 0 length or any even length.

Returns:

filled Map instance

collection

public static <T> java.util.Collection<T> collection(java.lang.Object x)

list

public static <T,U> java.util.ArrayList<T> list(U x)

Convert native array or some collection fo list

Parameters:

x - array, collection or a list

Returns:

listOf

public static <T,U> java.util.ArrayList<T> listOf(U... objects)

deepEqualityTest

public static boolean deepEqualityTest(java.lang.Object a,
                                       java.lang.Object b)

decodeBase64

public static byte[] decodeBase64(java.lang.String base64)

inParallel

public static DeferredResult inParallel(Do.Task task)

Immediately start specified task (e.g. block returning something and throwing some exception on failure) in a separate thread. Use DeferredResult to get the results. Meant to start operations that have to be done in parallel.

Parameters:

task - to perform

Returns:

connected and deferred result of the operation already started.

inParallel

public static DeferredResult inParallel(Do.TaskWithoutResult task)

bytesToHex

public static java.lang.String bytesToHex(byte[] bytes)

snakeToCamelCase

public static java.lang.String snakeToCamelCase(java.lang.String snakeString)

Convert a snake_case_string to CamelCaseString. The first character will always be in upper case

Parameters:

snakeString -

Returns:

converted string