Class StateSetEnumerator

java.lang.Object

jflex.state.StateSetEnumerator

All Implemented Interfaces:

Iterator<Integer>, PrimitiveIterator<Integer, IntConsumer>, PrimitiveIterator.OfInt

public final class StateSetEnumerator
extends Object
implements PrimitiveIterator.OfInt

Enumerates the states of a StateSet. Also provides an iterator for native int.

Version:

JFlex 1.9.1

See Also:

• StateSet

Nested Class Summary

Nested classes/interfaces inherited from interface PrimitiveIterator

PrimitiveIterator.OfDouble, PrimitiveIterator.OfInt, PrimitiveIterator.OfLong

Field Summary

Fields

Modifier and Type	Field	Description
private long[]	bits	Reference to the array of the StateSet to iterate over
private static final boolean	DEBUG	Local compile-time DEBUG flag
private int	index	Current index into the StateSet array.
private long	mask	mask = 1 << offset
private int	offset	Current offset into the StateSet array

Constructor Summary

Constructors

Constructor	Description
StateSetEnumerator()	Creates a new StateSetEnumerator that is not yet associated with a StateSet.
StateSetEnumerator(StateSet states)	Construct a StateSetEnumerator for a given StateSet.

Method Summary

Modifier and Type	Method	Description
private void	advance()	Advance to the next element in the set.
boolean	hasMoreElements()	Determine if there are further elements in the set to be returned.
boolean	hasNext()	Iterator interface method for nextElement().
int	nextElement()	Return the next element from the set.
int	nextInt()	Iterator interface method for hasMoreElements()
void	reset(StateSet states)	Reset this enumerator/iterator and associate it with a given StateSet.

Methods inherited from class Object

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

Methods inherited from interface Iterator

remove

Methods inherited from interface PrimitiveIterator.OfInt

forEachRemaining, forEachRemaining, next

Field Details

DEBUG

private static final boolean DEBUG

Local compile-time DEBUG flag

See Also:

• Constant Field Values

index

private int index

Current index into the StateSet array. index >= bits.length indicates that there are no further elements in the set.

offset

private int offset

Current offset into the StateSet array

mask

private long mask

mask = 1 << offset

bits

private long[] bits

Reference to the array of the StateSet to iterate over

Constructor Details

StateSetEnumerator

public StateSetEnumerator()

Creates a new StateSetEnumerator that is not yet associated with a StateSet. hasMoreElements() and nextElement() will throw NullPointerException when used before reset(StateSet)

StateSetEnumerator

public StateSetEnumerator(StateSet states)

Construct a StateSetEnumerator for a given StateSet. This should be the default constructor to use.

Parameters:

states - the StateSet object to iterate over.

See Also:

• StateSet.states()

Method Details

reset

public void reset(StateSet states)

Reset this enumerator/iterator and associate it with a given StateSet.

Parameters:

states - the StateSet object to iterate over.

advance

private void advance()

Advance to the next element in the set.

Precondition: there are more elements in the set.

hasMoreElements

public boolean hasMoreElements()

Determine if there are further elements in the set to be returned.

Returns:

true iff there are more elements in the set.

nextElement

public int nextElement()

Return the next element from the set.

Precondition: hasMoreElements() returns true

Returns:

the next element.

Throws:

NoSuchElementException - if there is no further element

See Also:

• hasMoreElements()

hasNext

public boolean hasNext()

Iterator interface method for nextElement().

Specified by:

hasNext in interface Iterator<Integer>

nextInt

public int nextInt()

Iterator interface method for hasMoreElements()

Specified by:

nextInt in interface PrimitiveIterator.OfInt