Package net.thevpc.common.util

Class Utils

java.lang.Object

net.thevpc.common.util.Utils

public class Utils
extends Object

Author:

taha.bensalah@gmail.com

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static int	compare(byte x, byte y)
static int	compare(double d1, double d2)
static int	compare(float f1, float f2)
static int	compare(int x, int y)
static int	compare(long x, long y)
static int	compare(Object a, Object b)
static int	compare(Object a, Object b, Comparator c)
static boolean[]	copyOf(boolean[] original, int newLength)	Copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
static char[]	copyOf(char[] original, int newLength)	Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length.
static double[]	copyOf(double[] original, int newLength)	Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
static float[]	copyOf(float[] original, int newLength)	Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
static int[]	copyOf(int[] original, int newLength)	Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
static long[]	copyOf(long[] original, int newLength)	Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
static short[]	copyOf(short[] original, int newLength)
static <T> T[]	copyOf(T[] original, int newLength)
static <T, U> T[]	copyOf(U[] original, int newLength, Class<? extends T[]> newType)
static Object	copyOfArray(Object array)
static int	fibonacci(int number)
static int	hashCode(Object o)
static <T, V> V	ifType(Object object, Class<T> type, Function<T,V> r)
static long	inUseMemory()
static boolean	isEmpty(Object object)
static Object	joinArrays(Object... arrays)
static Object	joinArraysAsType(Class componentType, Object... arrays)
static long	maxFreeMemory()
static <T> T	ncast(Class<T> type, Object object)
static <T> void	ncastDo(Class<T> type, Object object, DoWith<T> r)
static Object	nonEmptyValue(Object... objects)
static Object	nonNullValue(Object... objects)
static int	rand(int min, int max)
static <T> T	rand(Class<T> enumType)
static <T> T	rand(List<T> values)
static <T> T	rand(T[] values)
static Object	removeArray(Object array, int offset, int removeCount)
static Object	removeArrayTail(Object array, int offset, int removeCount)
static <T, V> List<T>	sort(List<T> list, Function<T,V> converter, Comparator<V> c)
static <T, V> T[]	sort(T[] arr, Function<T,V> converter, Comparator<V> c)

Methods inherited from class java.lang.Object

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

Constructor Details

Utils

public Utils()

Method Details

compare

public static int compare(Object a,
 Object b)

compare

public static int compare(Object a,
 Object b,
 Comparator c)

joinArrays

public static Object joinArrays(Object... arrays)

joinArraysAsType

public static Object joinArraysAsType(Class componentType,
 Object... arrays)

copyOfArray

public static Object copyOfArray(Object array)

removeArrayTail

public static Object removeArrayTail(Object array,
 int offset,
 int removeCount)

removeArray

public static Object removeArray(Object array,
 int offset,
 int removeCount)

ifType

public static <T,
V> V ifType(Object object,
 Class<T> type,
 Function<T,V> r)

ncastDo

public static <T> void ncastDo(Class<T> type,
 Object object,
 DoWith<T> r)

ncast

public static <T> T ncast(Class<T> type,
 Object object)

isEmpty

public static boolean isEmpty(Object object)

nonNullValue

public static Object nonNullValue(Object... objects)

nonEmptyValue

public static Object nonEmptyValue(Object... objects)

fibonacci

public static int fibonacci(int number)

rand

public static int rand(int min,
 int max)

rand

public static <T> T rand(List<T> values)

rand

public static <T> T rand(T[] values)

rand

public static <T> T rand(Class<T> enumType)

inUseMemory

public static long inUseMemory()

maxFreeMemory

public static long maxFreeMemory()

compare

public static int compare(byte x,
 byte y)

compare

public static int compare(int x,
 int y)

compare

public static int compare(long x,
 long y)

compare

public static int compare(double d1,
 double d2)

compare

public static int compare(float f1,
 float f2)

hashCode

public static int hashCode(Object o)

copyOf

public static <T> T[] copyOf(T[] original,
 int newLength)

copyOf

public static <T,
U> T[] copyOf(U[] original,
 int newLength,
 Class<? extends T[]> newType)

copyOf

public static short[] copyOf(short[] original,
 int newLength)

copyOf

public static int[] copyOf(int[] original,
 int newLength)

Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with zeros to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

copyOf

public static long[] copyOf(long[] original,
 int newLength)

Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0L. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with zeros to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

copyOf

public static char[] copyOf(char[] original,
 int newLength)

Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain '\\u000'. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with null characters to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

copyOf

public static float[] copyOf(float[] original,
 int newLength)

Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0f. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with zeros to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

copyOf

public static double[] copyOf(double[] original,
 int newLength)

Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain 0d. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with zeros to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

copyOf

public static boolean[] copyOf(boolean[] original,
 int newLength)

Copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length. For all indices that are valid in both the original array and the copy, the two arrays will contain identical values. For any indices that are valid in the copy but not the original, the copy will contain false. Such indices will exist if and only if the specified length is greater than that of the original array.

Parameters:

original - the array to be copied

newLength - the length of the copy to be returned

Returns:

a copy of the original array, truncated or padded with false elements to obtain the specified length

Throws:

NegativeArraySizeException - if newLength is negative

NullPointerException - if original is null

Since:

1.6

sort

public static <T,
V> List<T> sort(List<T> list,
 Function<T,V> converter,
 Comparator<V> c)

sort

public static <T,
V> T[] sort(T[] arr,
 Function<T,V> converter,
 Comparator<V> c)