com.google.common.collect

Interface RangeSet<C extends Comparable>

All Known Implementing Classes:

ImmutableRangeSet, TreeRangeSet

@Beta
public interface RangeSet<C extends Comparable>

A set comprising zero or more nonempty, disconnected ranges of type C.

Implementations that choose to support the add(Range) operation are required to ignore empty ranges and coalesce connected ranges. For example:

   RangeSet<Integer> rangeSet = TreeRangeSet.create();
   rangeSet.add(Range.closed(1, 10)); // {[1, 10]}
   rangeSet.add(Range.closedOpen(11, 15)); // {[1, 10], [11, 15)} 
   rangeSet.add(Range.open(15, 20)); // disconnected range; {[1, 10], [11, 20)}
   rangeSet.add(Range.openClosed(0, 0)); // empty range; {[1, 10], [11, 20)}
   rangeSet.remove(Range.open(5, 10)); // splits [1, 10]; {[1, 5], [10, 10], [11, 20)}

Note that the behavior of Range.isEmpty() and Range.isConnected(Range) may not be as expected on discrete ranges. See the Javadoc of those methods for details.

For a Set whose contents are specified by a Range, see ContiguousSet.

Since:

14.0

Author:

Kevin Bourrillion, Louis Wasserman

Method Summary

Methods

Modifier and Type	Method and Description
void	add(Range<C> range) Adds the specified range to this RangeSet (optional operation).
void	addAll(RangeSet<C> other) Adds all of the ranges from the specified range set to this range set (optional operation).
Set<Range<C>>	asRanges() Returns a view of the disconnected ranges that make up this range set.
void	clear() Removes all ranges from this RangeSet (optional operation).
RangeSet<C>	complement() Returns a view of the complement of this RangeSet.
boolean	contains(C value) Determines whether any of this range set's member ranges contains value.
boolean	encloses(Range<C> otherRange) Returns true if there exists a member range in this range set which encloses the specified range.
boolean	enclosesAll(RangeSet<C> other) Returns true if for each member range in other there exists a member range in this range set which encloses it.
boolean	equals(Object obj) Returns true if obj is another RangeSet that contains the same ranges according to Range.equals(Object).
int	hashCode() Returns asRanges().hashCode().
boolean	isEmpty() Returns true if this range set contains no ranges.
Range<C>	rangeContaining(C value) Returns the unique range from this range set that contains value, or null if this range set does not contain value.
void	remove(Range<C> range) Removes the specified range from this RangeSet (optional operation).
void	removeAll(RangeSet<C> other) Removes all of the ranges from the specified range set from this range set (optional operation).
Range<C>	span() Returns the minimal range which encloses all ranges in this range set.
RangeSet<C>	subRangeSet(Range<C> view) Returns a view of the intersection of this RangeSet with the specified range.
String	toString() Returns a readable string representation of this range set.

Method Detail

contains

boolean contains(C value)

Determines whether any of this range set's member ranges contains value.

rangeContaining

Range<C> rangeContaining(C value)

Returns the unique range from this range set that contains value, or null if this range set does not contain value.

encloses

boolean encloses(Range<C> otherRange)

Returns true if there exists a member range in this range set which encloses the specified range.

enclosesAll

boolean enclosesAll(RangeSet<C> other)

Returns true if for each member range in other there exists a member range in this range set which encloses it. It follows that this.contains(value) whenever other.contains(value). Returns true if other is empty.

This is equivalent to checking if this range set encloses(com.google.common.collect.Range<C>) each of the ranges in other.

isEmpty

boolean isEmpty()

Returns true if this range set contains no ranges.

span

Range<C> span()

Returns the minimal range which encloses all ranges in this range set.

Throws:

NoSuchElementException - if this range set is empty

asRanges

Set<Range<C>> asRanges()

Returns a view of the disconnected ranges that make up this range set. The returned set may be empty. The iterators returned by its Iterable.iterator() method return the ranges in increasing order of lower bound (equivalently, of upper bound).

complement

RangeSet<C> complement()

Returns a view of the complement of this RangeSet.

The returned view supports the add(com.google.common.collect.Range<C>) operation if this RangeSet supports remove(com.google.common.collect.Range<C>), and vice versa.

subRangeSet

RangeSet<C> subRangeSet(Range<C> view)

Returns a view of the intersection of this RangeSet with the specified range.

The returned view supports all optional operations supported by this RangeSet, with the caveat that an IllegalArgumentException is thrown on an attempt to add any range not enclosed by view.

add

void add(Range<C> range)

Adds the specified range to this RangeSet (optional operation). That is, for equal range sets a and b, the result of a.add(range) is that a will be the minimal range set for which both a.enclosesAll(b) and a.encloses(range).

Note that range will be coalesced with any ranges in the range set that are connected with it. Moreover, if range is empty, this is a no-op.

Throws:

UnsupportedOperationException - if this range set does not support the add operation

remove

void remove(Range<C> range)

Removes the specified range from this RangeSet (optional operation). After this operation, if range.contains(c), this.contains(c) will return false.

If range is empty, this is a no-op.

Throws:

UnsupportedOperationException - if this range set does not support the remove operation

clear

void clear()

Removes all ranges from this RangeSet (optional operation). After this operation, this.contains(c) will return false for all c.

This is equivalent to remove(Range.all()).

Throws:

UnsupportedOperationException - if this range set does not support the clear operation

addAll

void addAll(RangeSet<C> other)

Adds all of the ranges from the specified range set to this range set (optional operation). After this operation, this range set is the minimal range set that encloses both the original range set and other.

This is equivalent to calling add(com.google.common.collect.Range<C>) on each of the ranges in other in turn.

Throws:

UnsupportedOperationException - if this range set does not support the addAll operation

removeAll

void removeAll(RangeSet<C> other)

Removes all of the ranges from the specified range set from this range set (optional operation). After this operation, if other.contains(c), this.contains(c) will return false.

This is equivalent to calling remove(com.google.common.collect.Range<C>) on each of the ranges in other in turn.

Throws:

UnsupportedOperationException - if this range set does not support the removeAll operation

equals

boolean equals(@Nullable
             Object obj)

Returns true if obj is another RangeSet that contains the same ranges according to Range.equals(Object).

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Object.hashCode(), HashMap

hashCode

int hashCode()

Returns asRanges().hashCode().

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

toString

String toString()

Returns a readable string representation of this range set. For example, if this RangeSet consisted of Range.closed(1, 3) and Range.greaterThan(4), this might return " [1‥3](4‥+∞)"}.

Overrides:

toString in class Object

Returns:

a string representation of the object.