net.sf.saxon.expr.sort
Class IntArraySet

java.lang.Object
  net.sf.saxon.expr.sort.IntArraySet

All Implemented Interfaces:

Serializable, IntSet

public class IntArraySet
extends Object
implements Serializable, IntSet

Set of int values. This class is modelled on the java.net.Set interface, but it does not implement this interface, because the set members are int's rather than Objects.

This implementation of a set of integers is optimized to use very little storage and to provide fast comparison of two sets. The equals() method determines whether two sets contain the same integers.

This implementation is not efficient at adding new integers to the set. It creates a new array each time you do that.

Not thread safe.

Author:

Michael Kay

See Also:

Serialized Form

Field Summary

static int[]

EMPTY_INT_ARRAY

Constructor Summary

IntArraySet()
Create an empty set

IntArraySet(IntArraySet input)
Create one IntArraySet as a copy of another

IntArraySet(IntHashSet input)
Create a set containing integers from the specified IntHashSet

Method Summary

boolean	add(int value) Add an integer to the set
void	clear() Clear the contents of the IntSet (making it an empty set)
boolean	contains(int value) Determine whether a particular integer is present in the set
boolean	containsAll(IntSet other) Test if this set is a superset of another set
boolean	equals(Object other) Test whether this set has exactly the same members as another set
int	getFirst() Get the first value in the set.
int[]	getValues() Get the set of integer values as an array
int	hashCode() Construct a hash key that supports the equals() test
boolean	isEmpty() Determine if the set is empty
IntIterator	iterator() Get an iterator over the values
static IntArraySet	make(int[] in, int size) Factory method to construct a set from an array of integers
boolean	remove(int value) Remove an integer from the set
int	size() Get the number of integers in the set
String	toString()
IntArraySet	union(IntArraySet other) Form a new set that is the union of this set with another set.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_INT_ARRAY

public static final int[] EMPTY_INT_ARRAY

Constructor Detail

IntArraySet

public IntArraySet()

Create an empty set

IntArraySet

public IntArraySet(IntHashSet input)

Create a set containing integers from the specified IntHashSet

Parameters:

input - the set to be copied

IntArraySet

public IntArraySet(IntArraySet input)

Create one IntArraySet as a copy of another

Parameters:

input - the set to be copied

Method Detail

clear

public void clear()

Description copied from interface: IntSet

Clear the contents of the IntSet (making it an empty set)

Specified by:

clear in interface IntSet

size

public int size()

Description copied from interface: IntSet

Get the number of integers in the set

Specified by:

size in interface IntSet

Returns:

the size of the set

isEmpty

public boolean isEmpty()

Description copied from interface: IntSet

Determine if the set is empty

Specified by:

isEmpty in interface IntSet

Returns:

true if the set is empty, false if not

getValues

public int[] getValues()

Get the set of integer values as an array

Returns:

a sorted array of integers

contains

public boolean contains(int value)

Description copied from interface: IntSet

Determine whether a particular integer is present in the set

Specified by:

contains in interface IntSet

Parameters:

value - the integer under test

Returns:

true if value is present in the set, false if not

remove

public boolean remove(int value)

Description copied from interface: IntSet

Remove an integer from the set

Specified by:

remove in interface IntSet

Parameters:

value - the integer to be removed

Returns:

true if the integer was present in the set, false if it was not present

add

public boolean add(int value)

Add an integer to the set

Specified by:

add in interface IntSet

Parameters:

value - the integer to be added

Returns:

true if the integer was added, false if it was already present

getFirst

public int getFirst()

Get the first value in the set.

Returns:

the first value in the set, in sorted order

Throws:

ArrayIndexOutOfBoundsException - if the set is empty

iterator

public IntIterator iterator()

Get an iterator over the values

Specified by:

iterator in interface IntSet

Returns:

an iterator over the values, which will be delivered in sorted order

union

public IntArraySet union(IntArraySet other)

Form a new set that is the union of this set with another set.

Parameters:

other - the other set

Returns:

the union of the two sets

make

public static IntArraySet make(int[] in,
                               int size)

Factory method to construct a set from an array of integers

Parameters:

in - the array of integers, which must be in ascending order

size - the number of elements in the array that are significant

Returns:

the constructed set

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

Test whether this set has exactly the same members as another set

Overrides:

equals in class Object

hashCode

public int hashCode()

Construct a hash key that supports the equals() test

Overrides:

hashCode in class Object

containsAll

public boolean containsAll(IntSet other)

Test if this set is a superset of another set

Specified by:

containsAll in interface IntSet