Class Range<C extends Comparable>
 java.lang.Object

 com.google.common.collect.Range<C>

 All Implemented Interfaces:
Predicate<C>
,Serializable
,Predicate<C>
@GwtCompatible @Immutable(containerOf="C") public final class Range<C extends Comparable> extends Object implements Predicate<C>, Serializable
A range (or "interval") defines the boundaries around a contiguous span of values of someComparable
type; for example, "integers from 1 to 100 inclusive." Note that it is not possible to iterate over these contained values. To do so, pass this range instance and an appropriateDiscreteDomain
toContiguousSet.create(com.google.common.collect.Range<C>, com.google.common.collect.DiscreteDomain<C>)
.Types of ranges
Each end of the range may be bounded or unbounded. If bounded, there is an associated endpoint value, and the range is considered to be either open (does not include the endpoint) or closed (includes the endpoint) on that side. With three possibilities on each side, this yields nine basic types of ranges, enumerated below. (Notation: a square bracket (
[ ]
) indicates that the range is closed on that side; a parenthesis (( )
) means it is either open or unbounded. The construct{x  statement}
is read "the set of all x such that statement.")Range Types Notation Definition Factory method (a..b)
{x  a < x < b}
open
[a..b]
{x  a <= x <= b}
closed
(a..b]
{x  a < x <= b}
openClosed
[a..b)
{x  a <= x < b}
closedOpen
(a..+∞)
{x  x > a}
greaterThan
[a..+∞)
{x  x >= a}
atLeast
(∞..b)
{x  x < b}
lessThan
(∞..b]
{x  x <= b}
atMost
(∞..+∞)
{x}
all
When both endpoints exist, the upper endpoint may not be less than the lower. The endpoints may be equal only if at least one of the bounds is closed:
[a..a]
: a singleton range[a..a); (a..a]
: empty ranges; also valid(a..a)
: invalid; an exception will be thrown
Warnings
 Use immutable value types only, if at all possible. If you must use a mutable type, do not allow the endpoint instances to mutate after the range is created!
 Your value type's comparison method should be consistent with
equals if at all possible. Otherwise, be aware that concepts used throughout this
documentation such as "equal", "same", "unique" and so on actually refer to whether
compareTo
returns zero, not whetherequals
returnstrue
.  A class which implements
Comparable<UnrelatedType>
is very broken, and will cause undefined horrible things to happen inRange
. For now, the Range API does not prevent its use, because this would also rule out all ungenerified (preJDK1.5) data types. This may change in the future.
Other notes
 All ranges are shallowimmutable.
 Instances of this type are obtained using the static factory methods in this class.
 Ranges are convex: whenever two values are contained, all values in between them
must also be contained. More formally, for any
c1 <= c2 <= c3
of typeC
,r.contains(c1) && r.contains(c3)
impliesr.contains(c2)
). This means that aRange<Integer>
can never be used to represent, say, "all prime numbers from 1 to 100."  When evaluated as a
Predicate
, a range yields the same result as invokingcontains(C)
.  Terminology note: a range
a
is said to be the maximal range having property P if, for all rangesb
also having property P,a.encloses(b)
. Likewise,a
is minimal whenb.encloses(a)
for allb
having property P. See, for example, the definition ofintersection
.
Further reading
See the Guava User Guide article on
Range
. Since:
 10.0
 Author:
 Kevin Bourrillion, Gregory Kick
 See Also:
 Serialized Form


Method Summary
All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description static <C extends Comparable<?>>
Range<C>all()
Returns a range that contains every value of typeC
.boolean
apply(C input)
Deprecated.Provided only to satisfy thePredicate
interface; usecontains(C)
instead.static <C extends Comparable<?>>
Range<C>atLeast(C endpoint)
Returns a range that contains all values greater than or equal toendpoint
.static <C extends Comparable<?>>
Range<C>atMost(C endpoint)
Returns a range that contains all values less than or equal toendpoint
.Range<C>
canonical(DiscreteDomain<C> domain)
Returns the canonical form of this range in the given domain.static <C extends Comparable<?>>
Range<C>closed(C lower, C upper)
Returns a range that contains all values greater than or equal tolower
and less than or equal toupper
.static <C extends Comparable<?>>
Range<C>closedOpen(C lower, C upper)
Returns a range that contains all values greater than or equal tolower
and strictly less thanupper
.boolean
contains(C value)
Returnstrue
ifvalue
is within the bounds of this range.boolean
containsAll(Iterable<? extends C> values)
static <C extends Comparable<?>>
Range<C>downTo(C endpoint, BoundType boundType)
Returns a range from the given endpoint, which may be either inclusive (closed) or exclusive (open), with no upper bound.static <C extends Comparable<?>>
Range<C>encloseAll(Iterable<C> values)
Returns the minimal range that contains all of the given values.boolean
encloses(Range<C> other)
Returnstrue
if the bounds ofother
do not extend outside the bounds of this range.boolean
equals(Object object)
Returnstrue
ifobject
is a range having the same endpoints and bound types as this range.Range<C>
gap(Range<C> otherRange)
Returns the maximal range lying between this range andotherRange
, if such a range exists.static <C extends Comparable<?>>
Range<C>greaterThan(C endpoint)
Returns a range that contains all values strictly greater thanendpoint
.int
hashCode()
Returns a hash code for this range.boolean
hasLowerBound()
Returnstrue
if this range has a lower endpoint.boolean
hasUpperBound()
Returnstrue
if this range has an upper endpoint.Range<C>
intersection(Range<C> connectedRange)
Returns the maximal range enclosed by both this range andconnectedRange
, if such a range exists.boolean
isConnected(Range<C> other)
Returnstrue
if there exists a (possibly empty) range which is enclosed by both this range andother
.boolean
isEmpty()
Returnstrue
if this range is of the form[v..v)
or(v..v]
.static <C extends Comparable<?>>
Range<C>lessThan(C endpoint)
Returns a range that contains all values strictly less thanendpoint
.BoundType
lowerBoundType()
Returns the type of this range's lower bound:BoundType.CLOSED
if the range includes its lower endpoint,BoundType.OPEN
if it does not.C
lowerEndpoint()
Returns the lower endpoint of this range.static <C extends Comparable<?>>
Range<C>open(C lower, C upper)
Returns a range that contains all values strictly greater thanlower
and strictly less thanupper
.static <C extends Comparable<?>>
Range<C>openClosed(C lower, C upper)
Returns a range that contains all values strictly greater thanlower
and less than or equal toupper
.static <C extends Comparable<?>>
Range<C>range(C lower, BoundType lowerType, C upper, BoundType upperType)
Returns a range that contains any value fromlower
toupper
, where each endpoint may be either inclusive (closed) or exclusive (open).static <C extends Comparable<?>>
Range<C>singleton(C value)
Returns a range that contains only the given value.Range<C>
span(Range<C> other)
Returns the minimal range that encloses both this range andother
.String
toString()
Returns a string representation of this range, such as"[3..5)"
(other examples are listed in the class documentation).BoundType
upperBoundType()
Returns the type of this range's upper bound:BoundType.CLOSED
if the range includes its upper endpoint,BoundType.OPEN
if it does not.C
upperEndpoint()
Returns the upper endpoint of this range.static <C extends Comparable<?>>
Range<C>upTo(C endpoint, BoundType boundType)
Returns a range with no lower bound up to the given endpoint, which may be either inclusive (closed) or exclusive (open).



Method Detail

open
public static <C extends Comparable<?>> Range<C> open(C lower, C upper)
Returns a range that contains all values strictly greater thanlower
and strictly less thanupper
. Throws:
IllegalArgumentException
 iflower
is greater than or equal toupper
ClassCastException
 iflower
andupper
are not mutually comparable Since:
 14.0

closed
public static <C extends Comparable<?>> Range<C> closed(C lower, C upper)
Returns a range that contains all values greater than or equal tolower
and less than or equal toupper
. Throws:
IllegalArgumentException
 iflower
is greater thanupper
ClassCastException
 iflower
andupper
are not mutually comparable Since:
 14.0

closedOpen
public static <C extends Comparable<?>> Range<C> closedOpen(C lower, C upper)
Returns a range that contains all values greater than or equal tolower
and strictly less thanupper
. Throws:
IllegalArgumentException
 iflower
is greater thanupper
ClassCastException
 iflower
andupper
are not mutually comparable Since:
 14.0

openClosed
public static <C extends Comparable<?>> Range<C> openClosed(C lower, C upper)
Returns a range that contains all values strictly greater thanlower
and less than or equal toupper
. Throws:
IllegalArgumentException
 iflower
is greater thanupper
ClassCastException
 iflower
andupper
are not mutually comparable Since:
 14.0

range
public static <C extends Comparable<?>> Range<C> range(C lower, BoundType lowerType, C upper, BoundType upperType)
Returns a range that contains any value fromlower
toupper
, where each endpoint may be either inclusive (closed) or exclusive (open). Throws:
IllegalArgumentException
 iflower
is greater thanupper
ClassCastException
 iflower
andupper
are not mutually comparable Since:
 14.0

lessThan
public static <C extends Comparable<?>> Range<C> lessThan(C endpoint)
Returns a range that contains all values strictly less thanendpoint
. Since:
 14.0

atMost
public static <C extends Comparable<?>> Range<C> atMost(C endpoint)
Returns a range that contains all values less than or equal toendpoint
. Since:
 14.0

upTo
public static <C extends Comparable<?>> Range<C> upTo(C endpoint, BoundType boundType)
Returns a range with no lower bound up to the given endpoint, which may be either inclusive (closed) or exclusive (open). Since:
 14.0

greaterThan
public static <C extends Comparable<?>> Range<C> greaterThan(C endpoint)
Returns a range that contains all values strictly greater thanendpoint
. Since:
 14.0

atLeast
public static <C extends Comparable<?>> Range<C> atLeast(C endpoint)
Returns a range that contains all values greater than or equal toendpoint
. Since:
 14.0

downTo
public static <C extends Comparable<?>> Range<C> downTo(C endpoint, BoundType boundType)
Returns a range from the given endpoint, which may be either inclusive (closed) or exclusive (open), with no upper bound. Since:
 14.0

all
public static <C extends Comparable<?>> Range<C> all()
Returns a range that contains every value of typeC
. Since:
 14.0

singleton
public static <C extends Comparable<?>> Range<C> singleton(C value)
 Since:
 14.0

encloseAll
public static <C extends Comparable<?>> Range<C> encloseAll(Iterable<C> values)
Returns the minimal range that contains all of the given values. The returned range is closed on both ends. Throws:
ClassCastException
 if the values are not mutually comparableNoSuchElementException
 ifvalues
is emptyNullPointerException
 if any ofvalues
is null Since:
 14.0

hasLowerBound
public boolean hasLowerBound()
Returnstrue
if this range has a lower endpoint.

lowerEndpoint
public C lowerEndpoint()
Returns the lower endpoint of this range. Throws:
IllegalStateException
 if this range is unbounded below (that is,hasLowerBound()
returnsfalse
)

lowerBoundType
public BoundType lowerBoundType()
Returns the type of this range's lower bound:BoundType.CLOSED
if the range includes its lower endpoint,BoundType.OPEN
if it does not. Throws:
IllegalStateException
 if this range is unbounded below (that is,hasLowerBound()
returnsfalse
)

hasUpperBound
public boolean hasUpperBound()
Returnstrue
if this range has an upper endpoint.

upperEndpoint
public C upperEndpoint()
Returns the upper endpoint of this range. Throws:
IllegalStateException
 if this range is unbounded above (that is,hasUpperBound()
returnsfalse
)

upperBoundType
public BoundType upperBoundType()
Returns the type of this range's upper bound:BoundType.CLOSED
if the range includes its upper endpoint,BoundType.OPEN
if it does not. Throws:
IllegalStateException
 if this range is unbounded above (that is,hasUpperBound()
returnsfalse
)

isEmpty
public boolean isEmpty()
Returnstrue
if this range is of the form[v..v)
or(v..v]
. (This does not encompass ranges of the form(v..v)
, because such ranges are invalid and can't be constructed at all.)Note that certain discrete ranges such as the integer range
(3..4)
are not considered empty, even though they contain no actual values. In these cases, it may be helpful to preprocess ranges withcanonical(DiscreteDomain)
.

contains
public boolean contains(C value)
Returnstrue
ifvalue
is within the bounds of this range. For example, on the range[0..2)
,contains(1)
returnstrue
, whilecontains(2)
returnsfalse
.

apply
@Deprecated public boolean apply(C input)
Deprecated.Provided only to satisfy thePredicate
interface; usecontains(C)
instead.Description copied from interface:Predicate
Returns the result of applying this predicate toinput
(Java 8 users, see notes in the class documentation above). This method is generally expected, but not absolutely required, to have the following properties: Its execution does not cause any observable side effects.
 The computation is consistent with equals; that is,
Objects.equal
(a, b)
implies thatpredicate.apply(a) == predicate.apply(b))
.
 Specified by:
apply
in interfacePredicate<C extends Comparable>

containsAll
public boolean containsAll(Iterable<? extends C> values)

encloses
public boolean encloses(Range<C> other)
Returnstrue
if the bounds ofother
do not extend outside the bounds of this range. Examples:[3..6]
encloses[4..5]
(3..6)
encloses(3..6)
[3..6]
encloses[4..4)
(even though the latter is empty)(3..6]
does not enclose[3..6]
[4..5]
does not enclose(3..6)
(even though it contains every value contained by the latter range)[3..6]
does not enclose(1..1]
(even though it contains every value contained by the latter range)
Note that if
a.encloses(b)
, thenb.contains(v)
impliesa.contains(v)
, but as the last two examples illustrate, the converse is not always true.Being reflexive, antisymmetric and transitive, the
encloses
relation defines a partial order over ranges. There exists a unique maximal range according to this relation, and also numerous minimal ranges. Enclosure also implies connectedness.

isConnected
public boolean isConnected(Range<C> other)
Returnstrue
if there exists a (possibly empty) range which is enclosed by both this range andother
.For example,
[2, 4)
and[5, 7)
are not connected[2, 4)
and[3, 5)
are connected, because both enclose[3, 4)
[2, 4)
and[4, 6)
are connected, because both enclose the empty range[4, 4)
Note that this range and
other
have a welldefined union and intersection (as a single, possiblyempty range) if and only if this method returnstrue
.The connectedness relation is both reflexive and symmetric, but does not form an equivalence relation as it is not transitive.
Note that certain discrete ranges are not considered connected, even though there are no elements "between them." For example,
[3, 5]
is not considered connected to[6, 10]
. In these cases, it may be desirable for both input ranges to be preprocessed withcanonical(DiscreteDomain)
before testing for connectedness.

intersection
public Range<C> intersection(Range<C> connectedRange)
Returns the maximal range enclosed by both this range andconnectedRange
, if such a range exists.For example, the intersection of
[1..5]
and(3..7)
is(3..5]
. The resulting range may be empty; for example,[1..5)
intersected with[5..7)
yields the empty range[5..5)
.The intersection exists if and only if the two ranges are connected.
The intersection operation is commutative, associative and idempotent, and its identity element is
all()
). Throws:
IllegalArgumentException
 ifisConnected(connectedRange)
isfalse

gap
public Range<C> gap(Range<C> otherRange)
Returns the maximal range lying between this range andotherRange
, if such a range exists. The resulting range may be empty if the two ranges are adjacent but nonoverlapping.For example, the gap of
[1..5]
and(7..10)
is(5..7]
. The resulting range may be empty; for example, the gap between[1..5)
[5..7)
yields the empty range[5..5)
.The gap exists if and only if the two ranges are either disconnected or immediately adjacent (any intersection must be an empty range).
The gap operation is commutative.
 Throws:
IllegalArgumentException
 if this range andotherRange
have a nonempty intersection Since:
 27.0

span
public Range<C> span(Range<C> other)
Returns the minimal range that encloses both this range andother
. For example, the span of[1..3]
and(5..7)
is[1..7)
.If the input ranges are connected, the returned range can also be called their union. If they are not, note that the span might contain values that are not contained in either input range.
Like
intersection
, this operation is commutative, associative and idempotent. Unlike it, it is always welldefined for any two input ranges.

canonical
public Range<C> canonical(DiscreteDomain<C> domain)
Returns the canonical form of this range in the given domain. The canonical form has the following properties: equivalence:
a.canonical().contains(v) == a.contains(v)
for allv
(in other words,ContiguousSet.create(a.canonical(domain), domain).equals( ContiguousSet.create(a, domain))
 uniqueness: unless
a.isEmpty()
,ContiguousSet.create(a, domain).equals(ContiguousSet.create(b, domain))
impliesa.canonical(domain).equals(b.canonical(domain))
 idempotence:
a.canonical(domain).canonical(domain).equals(a.canonical(domain))
Furthermore, this method guarantees that the range returned will be one of the following canonical forms:
 [start..end)
 [start..+∞)
 (∞..end) (only if type
C
is unbounded below)  (∞..+∞) (only if type
C
is unbounded below)
 equivalence:

equals
public boolean equals(@CheckForNull Object object)
Returnstrue
ifobject
is a range having the same endpoints and bound types as this range. Note that discrete ranges such as(1..4)
and[2..3]
are not equal to one another, despite the fact that they each contain precisely the same set of values. Similarly, empty ranges are not equal unless they have exactly the same representation, so[3..3)
,(3..3]
,(4..4]
are all unequal. Specified by:
equals
in interfacePredicate<C extends Comparable>
 Overrides:
equals
in classObject
 Parameters:
object
 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
public int hashCode()
Returns a hash code for this range. Overrides:
hashCode
in classObject
 Returns:
 a hash code value for this object.
 See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)

