Package org.apache.poi.util

Class ArrayUtil

java.lang.Object

org.apache.poi.util.ArrayUtil

@Internal
public final class ArrayUtil
extends Object

Utility classes for dealing with arrays.

Method Summary

Modifier and Type	Method	Description
static void	arrayMoveWithin(Object[] array, int moveFrom, int moveTo, int numToMove)	Moves a number of entries in an array to another point in the array, shifting those inbetween as required.
static void	safelyAllocateCheck(long length, int maxLength, String limitMethod)	This method is targeted at doing length checks for generic array creations.
static void	strictAllocateCheck(long length, int maxLength)

Methods inherited from class java.lang.Object

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

Method Details

arrayMoveWithin

public static void arrayMoveWithin(Object[] array,
 int moveFrom,
 int moveTo,
 int numToMove)

Moves a number of entries in an array to another point in the array, shifting those inbetween as required.

Parameters:

array - The array to alter

moveFrom - The (0 based) index of the first entry to move

moveTo - The (0 based) index of the positition to move to

numToMove - The number of entries to move

safelyAllocateCheck

public static void safelyAllocateCheck(long length,
 int maxLength,
 String limitMethod)

This method is targeted at doing length checks for generic array creations. IOUtils.safelyAllocateCheck(long, int, String) is aimed at byte array based checks (or equivalents streams of bytes). Arrays of object instances will take up a lot more memory than the same number of bytes. So the limits applied in ArrayUtil are intended to be a lot lower than the IOUtil ones.

Parameters:

length -

maxLength -

limitMethod - name of method that can be used to change the limit

Throws:

RecordFormatException - if the length is negative or too long

strictAllocateCheck

public static void strictAllocateCheck(long length,
 int maxLength)