Package groovy.lang

Class EmptyRange<T extends Comparable>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<T>

groovy.lang.EmptyRange<T>

All Implemented Interfaces:

Range<T>, Iterable<T>, Collection<T>, List<T>

public class EmptyRange<T extends Comparable>
extends AbstractList<T>
implements Range<T>

Constructing Ranges like 0..<0

Field Summary

Fields

Modifier and Type	Field	Description
protected T	at	The value at which the range originates (may be null).

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
EmptyRange(T at)	Creates a new EmptyRange.

Method Summary

Modifier and Type	Method	Description
boolean	add(T o)	Always throws UnsupportedOperationException for an empty range.
boolean	addAll(int index, Collection<? extends T> c)	Always throws UnsupportedOperationException for an empty range.
boolean	addAll(Collection<? extends T> c)	Always throws UnsupportedOperationException for an empty range.
boolean	containsWithinBounds(Object o)	Never true for an empty range.
T	get(int index)	Always throws IndexOutOfBoundsException for an empty range.
T	getFrom()	The lower value in the range.
T	getTo()	The upper value in the range.
String	inspect()
boolean	isReverse()	Never true for an empty range.
T	remove(int index)	Always throws UnsupportedOperationException for an empty range.
boolean	remove(Object o)	Always throws UnsupportedOperationException for an empty range.
boolean	removeAll(Collection<?> c)	Always throws UnsupportedOperationException for an empty range.
boolean	retainAll(Collection<?> c)	Always throws UnsupportedOperationException for an empty range.
T	set(int index, T element)	Always throws UnsupportedOperationException for an empty range.
int	size()	Always 0 for an empty range.
List<T>	step(int step)	Always returns an empty list for an empty range.
void	step(int step, Closure closure)	Always does nothing for an empty range.
String	toString()

Methods inherited from class java.util.AbstractList

add, clear, equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, removeRange, subList

Methods inherited from class java.util.AbstractCollection

contains, containsAll, isEmpty, toArray, toArray

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

add, clear, contains, containsAll, equals, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, replaceAll, sort, spliterator, subList, toArray, toArray

Field Detail

at

protected T extends Comparable at

The value at which the range originates (may be null).

Constructor Detail

EmptyRange

public EmptyRange(T at)

Creates a new EmptyRange.

Parameters:

at - the value at which the range starts (may be null).

Method Detail

getFrom

public T getFrom()

The lower value in the range.

Specified by:

getFrom in interface Range<T extends Comparable>

Returns:

the lower value in the range.

getTo

public T getTo()

The upper value in the range.

Specified by:

getTo in interface Range<T extends Comparable>

Returns:

the upper value in the range

isReverse

public boolean isReverse()

Never true for an empty range.

Specified by:

isReverse in interface Range<T extends Comparable>

Returns:

false

containsWithinBounds

public boolean containsWithinBounds(Object o)

Never true for an empty range.

Specified by:

containsWithinBounds in interface Range<T extends Comparable>

Parameters:

o - the object to check against the boundaries of the range

Returns:

false

inspect

public String inspect()

Specified by:

inspect in interface Range<T extends Comparable>

Returns:

the verbose String representation of this Range as would be typed into a console to create the Range instance

toString

public String toString()

Overrides:

toString in class AbstractCollection<T extends Comparable>

size

public int size()

Always 0 for an empty range.

Specified by:

size in interface Collection<T extends Comparable>

Specified by:

size in interface List<T extends Comparable>

Specified by:

size in class AbstractCollection<T extends Comparable>

Returns:

0

get

public T get(int index)

Always throws IndexOutOfBoundsException for an empty range.

Specified by:

get in interface List<T extends Comparable>

Specified by:

get in class AbstractList<T extends Comparable>

Throws:

IndexOutOfBoundsException - always

add

public boolean add(T o)

Always throws UnsupportedOperationException for an empty range.

Specified by:

add in interface Collection<T extends Comparable>

Specified by:

add in interface List<T extends Comparable>

Overrides:

add in class AbstractList<T extends Comparable>

Throws:

UnsupportedOperationException - always

addAll

public boolean addAll(int index,
                      Collection<? extends T> c)

Always throws UnsupportedOperationException for an empty range.

Specified by:

addAll in interface List<T extends Comparable>

Overrides:

addAll in class AbstractList<T extends Comparable>

Throws:

UnsupportedOperationException

addAll

public boolean addAll(Collection<? extends T> c)

Always throws UnsupportedOperationException for an empty range.

Specified by:

addAll in interface Collection<T extends Comparable>

Specified by:

addAll in interface List<T extends Comparable>

Overrides:

addAll in class AbstractCollection<T extends Comparable>

Throws:

UnsupportedOperationException

remove

public boolean remove(Object o)

Always throws UnsupportedOperationException for an empty range.

Specified by:

remove in interface Collection<T extends Comparable>

Specified by:

remove in interface List<T extends Comparable>

Overrides:

remove in class AbstractCollection<T extends Comparable>

Throws:

UnsupportedOperationException

remove

public T remove(int index)

Always throws UnsupportedOperationException for an empty range.

Specified by:

remove in interface List<T extends Comparable>

Overrides:

remove in class AbstractList<T extends Comparable>

Throws:

UnsupportedOperationException

removeAll

public boolean removeAll(Collection<?> c)

Always throws UnsupportedOperationException for an empty range.

Specified by:

removeAll in interface Collection<T extends Comparable>

Specified by:

removeAll in interface List<T extends Comparable>

Overrides:

removeAll in class AbstractCollection<T extends Comparable>

Throws:

UnsupportedOperationException

retainAll

public boolean retainAll(Collection<?> c)

Always throws UnsupportedOperationException for an empty range.

Specified by:

retainAll in interface Collection<T extends Comparable>

Specified by:

retainAll in interface List<T extends Comparable>

Overrides:

retainAll in class AbstractCollection<T extends Comparable>

Throws:

UnsupportedOperationException

set

public T set(int index,
             T element)

Always throws UnsupportedOperationException for an empty range.

Specified by:

set in interface List<T extends Comparable>

Overrides:

set in class AbstractList<T extends Comparable>

Throws:

UnsupportedOperationException

step

public void step(int step,
                 Closure closure)

Always does nothing for an empty range.

Specified by:

step in interface Range<T extends Comparable>

Parameters:

step - the amount by which to step. If negative, steps through the range backwards.

closure - the Closure to call

step

public List<T> step(int step)

Always returns an empty list for an empty range.

Specified by:

step in interface Range<T extends Comparable>

Parameters:

step - the amount by which to step. If negative, steps through the range backwards.

Returns:

the list formed by stepping through the range by the indicated interval.