net.sf.saxon.z

Class IntRangeSet

java.lang.Object

net.sf.saxon.z.IntRangeSet

All Implemented Interfaces:

IntSet

public class IntRangeSet
extends java.lang.Object
implements IntSet

Set of int values. This implementation of IntSet uses a sorted array of integer ranges.

Author:

Michael Kay

Constructor Summary

Constructors

Constructor and Description
IntRangeSet() Create an empty set
IntRangeSet(int[] startPoints, int[] endPoints) Create an IntRangeSet given the start points and end points of the integer ranges.
IntRangeSet(IntRangeSet input) Create one IntRangeSet as a copy of another

Method Summary

Modifier and Type	Method and Description
boolean	add(int value) Add an integer to the set
void	addRange(int low, int high) Add a range of integers 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
IntSet	copy() Create a copy of this IntSet that leaves the original unchanged.
boolean	equals(java.lang.Object other) Test whether this set has exactly the same members as another set.
int[]	getEndPoints() Get the end points of the ranges
int	getNumberOfRanges() Get the number of ranges actually in use
int[]	getStartPoints() Get the start points of the ranges
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
IntSet	mutableCopy() Create a copy of this IntSet that contains the same set of integers.
boolean	remove(int value) Remove an integer from the set
int	size() Get the number of integers in the set
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.z.IntSet

containsAll, except, intersect, union

Constructor Detail

IntRangeSet

public IntRangeSet()

Create an empty set

IntRangeSet

public IntRangeSet(IntRangeSet input)

Create one IntRangeSet as a copy of another

Parameters:

input - the IntRangeSet to be copied

IntRangeSet

public IntRangeSet(int[] startPoints,
                   int[] endPoints)

Create an IntRangeSet given the start points and end points of the integer ranges. The two arrays must be the same length; each must be in ascending order; and the n'th end point must be greater than the n'th start point, and less than the n+1'th start point, for all n.

Parameters:

startPoints - the start points of the integer ranges

endPoints - the end points of the integer ranges

Throws:

java.lang.IllegalArgumentException - if the two arrays are different lengths. Other error conditions in the input are not currently detected.

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

copy

public IntSet copy()

Description copied from interface: IntSet

Create a copy of this IntSet that leaves the original unchanged.

Specified by:

copy in interface IntSet

Returns:

an IntSet containing the same integers. The result will not necessarily be the same class as the original. It will either be an immutable object, or a newly constructed object.

mutableCopy

public IntSet mutableCopy()

Description copied from interface: IntSet

Create a copy of this IntSet that contains the same set of integers.

Specified by:

mutableCopy in interface IntSet

Returns:

an IntSet containing the same integers. The result will not necessarily be the same class as the original. It will always be a mutable object

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

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

iterator

public IntIterator iterator()

Get an iterator over the values

Specified by:

iterator in interface IntSet

Returns:

an iterator over the integers in the set

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Test whether this set has exactly the same members as another set. Note that IntRangeSet values are NOT comparable with other implementations of IntSet

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Construct a hash key that supports the equals() test

Overrides:

hashCode in class java.lang.Object

addRange

public void addRange(int low,
                     int high)

Add a range of integers to the set. This is optimized for the case where these are all greater than any existing integer in the set.

Parameters:

low - the low end of the new range

high - the high end of the new range

getStartPoints

public int[] getStartPoints()

Get the start points of the ranges

getEndPoints

public int[] getEndPoints()

Get the end points of the ranges

getNumberOfRanges

public int getNumberOfRanges()

Get the number of ranges actually in use