Package de.rwth.swc.coffee4j.algorithmic.util

Class IntArrayWrapper

java.lang.Object

de.rwth.swc.coffee4j.algorithmic.util.IntArrayWrapper

public final class IntArrayWrapper
extends Object

A wrapper class for integer arrays so that they can be used inside collections. The default Object.equals(Object) and Object.hashCode() implementation depend only on the storage location of an array and thus comparing to arrays via equals does not make sense and the hash code does not help either. This class just wraps the array and uses Arrays.equals(int[], int[]) and Arrays.hashCode(int[]).

Constructor Summary

Constructors

Constructor	Description
IntArrayWrapper(int[] array)	Creates a new wrapper with the array.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
int[]	getArray()
int	hashCode()
String	toString()
static IntArrayWrapper	wrap(int... array)	Convenience method for wrapping a int[] into a IntArrayWrapper.
static List<IntArrayWrapper>	wrapToList(Collection<int[]> arrays)	Convenience method for wrapping all int[] in a collection into a list.
static Set<IntArrayWrapper>	wrapToSet(Collection<int[]> arrays)	Convenience method for wrapping all int[] in a collection into a set.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IntArrayWrapper

public IntArrayWrapper(int[] array)

Creates a new wrapper with the array. The array can be modified from the outside as not copy is used for performance reasons.

Parameters:

array - the array to wrap

Method Detail

getArray

public int[] getArray()

wrap

public static IntArrayWrapper wrap(int... array)

Convenience method for wrapping a int[] into a IntArrayWrapper.

Parameters:

array - the array to wrap

Returns:

the wrapped array

wrapToList

public static List<IntArrayWrapper> wrapToList(Collection<int[]> arrays)

Convenience method for wrapping all int[] in a collection into a list.

Parameters:

arrays - the arrays to wrap

Returns:

a list containing the wrapped arrays

wrapToSet

public static Set<IntArrayWrapper> wrapToSet(Collection<int[]> arrays)

Convenience method for wrapping all int[] in a collection into a set. As the wrappers contain sensible hashcode and equals functions, no duplicates are present in the set.

Parameters:

arrays - the arrays to wrap

Returns:

a set containing the wrapped arrays

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object