Package monq.jfa.util

Class ArrayUtil

java.lang.Object

monq.jfa.util.ArrayUtil

public final class ArrayUtil
extends Object

is a collection of static methods to manipulate arrays. The idea is that the currently used area in the array is stored somewhere else. The functions in here, except resize(), pretend the whole array is in use.

This will hopefully be mostly obsoleted as soon as we have generics. The set of methods is not in any way complete, because I only add what I just needed.

Method Summary

Modifier and Type	Method	Description
static void	delete(byte[] ary, int pos, int count)	deletes count elements from ary starting at index pos by copying the elements at indices greater than or equal to pos+count to index pos.
static void	delete(int[] ary, int pos, int count)	deletes count elements from ary starting at index pos by copying the elements at indices greater than or equal to pos+count to index pos.
static void	delete(Object[] ary, int pos, int count)
static void	insert(byte[] ary, int pos, byte elem)
static void	insert(char[] ary, int pos, char elem)
static void	insert(int[] ary, int pos, int elem)	inserts elem at index pos in ary by shifting all elements at indices greater pos to a one larger index position.
static void	insert(Object[] ary, int pos, Object o)
static byte[]	resize(byte[] old, int newSize)
static char[]	resize(char[] old, int newSize)
static int[]	resize(int[] old, int newSize)	allocates a new array with the given newSize and copies the content of old into the new array up to the maximum of newSize or old.length.
static Object[]	resize(Object[] old, int newSize)

Methods inherited from class java.lang.Object

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

Method Details

resize

public static int[] resize(int[] old,
 int newSize)

allocates a new array with the given newSize and copies the content of old into the new array up to the maximum of newSize or old.length.

Returns:

the newly allocate array

insert

public static void insert(int[] ary,
 int pos,
 int elem)

inserts elem at index pos in ary by shifting all elements at indices greater pos to a one larger index position. The very last element of the array is lost.

delete

public static void delete(int[] ary,
 int pos,
 int count)

deletes count elements from ary starting at index pos by copying the elements at indices greater than or equal to pos+count to index pos. The elements which become "free" at the end of the array are not touched and the array is not resized. Call resize() afterwards to reallocate the array.

delete

public static void delete(byte[] ary,
 int pos,
 int count)

deletes count elements from ary starting at index pos by copying the elements at indices greater than or equal to pos+count to index pos.

See Also:

• delete(int[],int,int)

resize

public static char[] resize(char[] old,
 int newSize)

See Also:

• resize(int[],int)

insert

public static void insert(char[] ary,
 int pos,
 char elem)

See Also:

• insert(int[],int,int)

resize

public static byte[] resize(byte[] old,
 int newSize)

See Also:

• resize(int[],int)

insert

public static void insert(byte[] ary,
 int pos,
 byte elem)

See Also:

• insert(int[],int,int)

resize

public static Object[] resize(Object[] old,
 int newSize)

See Also:

• resize(int[],int)

insert

public static void insert(Object[] ary,
 int pos,
 Object o)

See Also:

• insert(int[],int,int)

delete

public static void delete(Object[] ary,
 int pos,
 int count)

See Also:

• delete(int[],int,int)