org.spf4j.base

Class Arrays

java.lang.Object

org.spf4j.base.Arrays

@GwtCompatible
public final class Arrays
extends Object

Array utilities.

Author:

zoly

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	EMPTY_BYTE_ARRAY
static int[]	EMPTY_INT_ARRAY
static long[]	EMPTY_LONG_ARRAY
static Object[]	EMPTY_OBJ_ARRAY
static String[]	EMPTY_STRING_ARRAY

Method Summary

Modifier and Type	Method and Description
static <T> T[]	concat(T[]... arrays)
static boolean	deepEquals(Object[] a1, Object[] a2, int starting)
static boolean	deepEquals(Object[] a1, Object[] a2, int starting, int ending)
static double[]	divide(double[] arr1, double[] arr2)
static boolean	equals(byte[] a, byte[] b, int a1, int b1, int length)
static void	fill(byte[] array, int startIdx, int endIdx, byte value) implementation which significantly faster for large arrays (> 500).
static void	fill(char[] array, int startIdx, int endIdx, char value)
static void	fill(double[] array, int startIdx, int endIdx, double value)
static void	fill(int[] array, int startIdx, int endIdx, int value)
static void	fill(long[] array, int startIdx, int endIdx, long value)
static <T> void	fill(T[] array, int startIdx, int endIdx, T value) implementation which is significantly faster for large arrays (> 500).
static double[]	getColumn(double[][] data, int columnNumber)
static double[]	getColumnAsDoubles(long[][] data, int columnNumber)
static <T> int	indexOf(T[] array, T content)
static <T> T[]	moveOfRange(T[] original, int from, int to)
static int	search(char[] array, char c)
static double[]	toDoubleArray(long... larr)
static Object[]	toObjectArray(long... larr)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_OBJ_ARRAY

public static final Object[] EMPTY_OBJ_ARRAY

EMPTY_STRING_ARRAY

public static final String[] EMPTY_STRING_ARRAY

EMPTY_BYTE_ARRAY

public static final byte[] EMPTY_BYTE_ARRAY

EMPTY_LONG_ARRAY

public static final long[] EMPTY_LONG_ARRAY

EMPTY_INT_ARRAY

public static final int[] EMPTY_INT_ARRAY

Method Detail

getColumnAsDoubles

public static double[] getColumnAsDoubles(long[][] data,
                                          int columnNumber)

getColumn

public static double[] getColumn(double[][] data,
                                 int columnNumber)

toDoubleArray

public static double[] toDoubleArray(long... larr)

toObjectArray

public static Object[] toObjectArray(long... larr)

divide

public static double[] divide(double[] arr1,
                              double[] arr2)

deepEquals

public static boolean deepEquals(Object[] a1,
                                 Object[] a2,
                                 int starting)

deepEquals

public static boolean deepEquals(Object[] a1,
                                 Object[] a2,
                                 int starting,
                                 int ending)

equals

public static boolean equals(byte[] a,
                             byte[] b,
                             int a1,
                             int b1,
                             int length)

search

public static int search(char[] array,
                         char c)

moveOfRange

public static <T> T[] moveOfRange(T[] original,
                                  int from,
                                  int to)

concat

public static <T> T[] concat(T[]... arrays)

indexOf

public static <T> int indexOf(T[] array,
                              T content)

fill

@Beta
public static void fill(byte[] array,
                              int startIdx,
                              int endIdx,
                              byte value)

implementation which significantly faster for large arrays (> 500).

fill

@Beta
public static <T> void fill(T[] array,
                                  int startIdx,
                                  int endIdx,
                                  T value)

implementation which is significantly faster for large arrays (> 500). Bechmark results: Benchmark Mode Cnt Score Error Units ArraysBenchmark.testSpf4jFillSmall(10) thrpt 10 1048892782.375 ± 29976629.818 ops/s ArraysBenchmark.testjdkFillSmall(10) thrpt 10 1046330835.509 ± 47577260.717 ops/s ArraysBenchmark.testSpf4jFillMedium(100) thrpt 10 123724912.161 ± 4049077.779 ops/s ArraysBenchmark.testjdkFillMedium(100) thrpt 10 124143139.498 ± 2044760.427 ops/s ArraysBenchmark.testSpf4jFillLarge(1000) thrpt 10 20335282.192 ± 592359.181 ops/s ArraysBenchmark.testjdkFillLarge(1000) thrpt 10 12661975.522 ± 170457.046 ops/s ArraysBenchmark.testSpf4jFillVeryLarge(10000) thrpt 10 2767351.098 ± 74871.147 ops/s ArraysBenchmark.testjdkFillVeryLarge(10000 thrpt 10 1045099.669 ± 30044.505 ops/s

fill

@Beta
public static void fill(char[] array,
                              int startIdx,
                              int endIdx,
                              char value)

fill

@Beta
public static void fill(int[] array,
                              int startIdx,
                              int endIdx,
                              int value)

fill

@Beta
public static void fill(long[] array,
                              int startIdx,
                              int endIdx,
                              long value)

fill

@Beta
public static void fill(double[] array,
                              int startIdx,
                              int endIdx,
                              double value)