Package io.vavr.control
Interface Validation<E,T>
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- Type Parameters:
E
- value type in the case of invalidT
- value type in the case of valid
- All Superinterfaces:
java.lang.Iterable<T>
,java.io.Serializable
,Value<T>
- All Known Implementing Classes:
Validation.Invalid
,Validation.Valid
public interface Validation<E,T> extends Value<T>, java.io.Serializable
An implementation similar to scalaz's Validation control.The Validation type is different from a Monad type, it is an applicative functor. Whereas a Monad will short circuit after the first error, the applicative functor will continue on, accumulating ALL errors. This is especially helpful in cases such as validation, where you want to know all the validation errors that have occurred, not just the first one.
Validation construction: Valid: Validation<String,Integer> valid = Validation.valid(5); Invalid: Validation<List<String>,Integer> invalid = Validation.invalid(List.of("error1","error2")); Validation combination: Validation<String,String> valid1 = Validation.valid("John"); Validation<String,Integer> valid2 = Validation.valid(5); Validation<String,Option<String>> valid3 = Validation.valid(Option.of("123 Fake St.")); Function3<String,Integer,Option<String>,Person> f = ...; Validation<List<String>,String> result = valid1.combine(valid2).ap((name,age) -> "Name: "+name+" Age: "+age); Validation<List<String>,Person> result2 = valid1.combine(valid2).combine(valid3).ap(f); Another form of combining validations: Validation<List<String>,Person> result3 = Validation.combine(valid1, valid2, valid3).ap(f);
- See Also:
- Validation
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Nested Class Summary
Nested Classes Modifier and Type Interface Description static class
Validation.Builder<E,T1,T2>
static class
Validation.Builder3<E,T1,T2,T3>
static class
Validation.Builder4<E,T1,T2,T3,T4>
static class
Validation.Builder5<E,T1,T2,T3,T4,T5>
static class
Validation.Builder6<E,T1,T2,T3,T4,T5,T6>
static class
Validation.Builder7<E,T1,T2,T3,T4,T5,T6,T7>
static class
Validation.Builder8<E,T1,T2,T3,T4,T5,T6,T7,T8>
static class
Validation.Invalid<E,T>
An invalid Validationstatic class
Validation.Valid<E,T>
A valid Validation
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Field Summary
Fields Modifier and Type Field Description static long
serialVersionUID
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Default Methods Modifier and Type Method Description default <U> Validation<Seq<E>,U>
ap(Validation<Seq<E>,? extends java.util.function.Function<? super T,? extends U>> validation)
default <E2,T2>
Validation<E2,T2>bimap(java.util.function.Function<? super E,? extends E2> errorMapper, java.util.function.Function<? super T,? extends T2> valueMapper)
Whereas map only performs a mapping on a valid Validation, and mapError performs a mapping on an invalid Validation, bimap allows you to provide mapping actions for both, and will give you the result based on what type of Validation this is.static <E,T1,T2>
Validation.Builder<E,T1,T2>combine(Validation<E,T1> validation1, Validation<E,T2> validation2)
Combines twoValidation
s into aValidation.Builder
.static <E,T1,T2,T3>
Validation.Builder3<E,T1,T2,T3>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3)
Combines threeValidation
s into aValidation.Builder3
.static <E,T1,T2,T3,T4>
Validation.Builder4<E,T1,T2,T3,T4>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4)
Combines fourValidation
s into aValidation.Builder4
.static <E,T1,T2,T3,T4,T5>
Validation.Builder5<E,T1,T2,T3,T4,T5>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5)
Combines fiveValidation
s into aValidation.Builder5
.static <E,T1,T2,T3,T4,T5,T6>
Validation.Builder6<E,T1,T2,T3,T4,T5,T6>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6)
Combines sixValidation
s into aValidation.Builder6
.static <E,T1,T2,T3,T4,T5,T6,T7>
Validation.Builder7<E,T1,T2,T3,T4,T5,T6,T7>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6, Validation<E,T7> validation7)
Combines sevenValidation
s into aValidation.Builder7
.static <E,T1,T2,T3,T4,T5,T6,T7,T8>
Validation.Builder8<E,T1,T2,T3,T4,T5,T6,T7,T8>combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6, Validation<E,T7> validation7, Validation<E,T8> validation8)
Combines eightValidation
s into aValidation.Builder8
.default <U> Validation.Builder<E,T,U>
combine(Validation<E,U> validation)
Combines twoValidation
s to form aValidation.Builder
, which can then be used to perform further combines, or apply a function to it in order to transform theValidation.Builder
into aValidation
.boolean
equals(java.lang.Object o)
Clarifies that values have a proper equals() method implemented.default Option<Validation<E,T>>
filter(java.util.function.Predicate<? super T> predicate)
default <U> Validation<E,U>
flatMap(java.util.function.Function<? super T,? extends Validation<E,? extends U>> mapper)
default <U> U
fold(java.util.function.Function<? super E,? extends U> ifInvalid, java.util.function.Function<? super T,? extends U> ifValid)
Transforms thisValidation
to a value of typeU
.default void
forEach(java.util.function.Consumer<? super T> action)
Performs the given action for the value contained inValid
, or does nothing if this is anInvalid
.static <E,T>
Validation<E,T>fromEither(Either<E,T> either)
Creates aValidation
of anEither
.static <T> Validation<java.lang.Throwable,T>
fromTry(Try<? extends T> t)
Creates aValidation
of anTry
.T
get()
Gets the value of thisValidation
if is aValid
or throws if this is anInvalid
.E
getError()
Gets the error of this Validation if it is anInvalid
or throws if this is aValid
.default T
getOrElseGet(java.util.function.Function<? super E,? extends T> other)
Gets the value if it is a Valid or an value calculated from the error.int
hashCode()
Clarifies that values have a proper hashCode() method implemented.static <E,T>
Validation<E,T>invalid(E error)
Creates anValidation.Invalid
that contains the givenerror
.default boolean
isAsync()
AValidation
's value is computed synchronously.default boolean
isEmpty()
Checks, thisValue
is empty, i.e.boolean
isInvalid()
Check whether this is of typeInvalid
default boolean
isLazy()
AValidation
's value is computed eagerly.default boolean
isSingleValued()
States whether this is a single-valued type.boolean
isValid()
Check whether this is of typeValid
default Iterator<T>
iterator()
Returns a richio.vavr.collection.Iterator
.default <U> Validation<E,U>
map(java.util.function.Function<? super T,? extends U> f)
Maps the underlying value to a different component type.default <U> Validation<U,T>
mapError(java.util.function.Function<? super E,? extends U> f)
Applies a function f to the error of this Validation if this is an Invalid.static <E,T>
Validation<E,T>narrow(Validation<? extends E,? extends T> validation)
Narrows a widenedValidation<? extends E, ? extends T>
toValidation<E, T>
by performing a type-safe cast.default Validation<E,T>
orElse(Validation<? extends E,? extends T> other)
Returns thisValidation
if it is valid, otherwise return the alternative.default Validation<E,T>
orElse(java.util.function.Supplier<Validation<? extends E,? extends T>> supplier)
Returns thisValidation
if it is valid, otherwise return the result of evaluating supplier.default Validation<E,T>
peek(java.util.function.Consumer<? super T> action)
Performs the givenaction
on the first element if this is an eager implementation.static <E,T>
Validation<Seq<E>,Seq<T>>sequence(java.lang.Iterable<? extends Validation<? extends Seq<? extends E>,? extends T>> values)
Reduces manyValidation
instances into a singleValidation
by transforming anIterable<Validation<? extends T>>
into aValidation<Seq<T>>
.default Validation<T,E>
swap()
Flip the valid/invalid values for this Validation.default Either<E,T>
toEither()
Converts this Validation to anEither
.java.lang.String
toString()
Clarifies that values have a proper toString() method implemented.static <E,T,U>
Validation<Seq<E>,Seq<U>>traverse(java.lang.Iterable<? extends T> values, java.util.function.Function<? super T,? extends Validation<? extends Seq<? extends E>,? extends U>> mapper)
Maps the values of an iterable to a sequence of mapped values into a singleValidation
by transforming anIterable<? extends T>
into aValidation<Seq<U>>
.static <E,T>
Validation<E,T>valid(T value)
Creates aValidation.Valid
that contains the givenvalue
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Methods inherited from interface io.vavr.Value
collect, collect, contains, corresponds, eq, exists, forAll, getOrElse, getOrElse, getOrElseThrow, getOrElseTry, getOrNull, out, out, spliterator, stderr, stdout, stringPrefix, toArray, toCharSeq, toCompletableFuture, toEither, toEither, toInvalid, toInvalid, toJavaArray, toJavaArray, toJavaArray, toJavaCollection, toJavaList, toJavaList, toJavaMap, toJavaMap, toJavaMap, toJavaOptional, toJavaParallelStream, toJavaSet, toJavaSet, toJavaStream, toLeft, toLeft, toLinkedMap, toLinkedMap, toLinkedSet, toList, toMap, toMap, toOption, toPriorityQueue, toPriorityQueue, toQueue, toRight, toRight, toSet, toSortedMap, toSortedMap, toSortedMap, toSortedMap, toSortedSet, toSortedSet, toStream, toTree, toTree, toTry, toTry, toValid, toValid, toValidation, toValidation, toVector
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Field Detail
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serialVersionUID
static final long serialVersionUID
- See Also:
- Constant Field Values
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Method Detail
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valid
static <E,T> Validation<E,T> valid(T value)
Creates aValidation.Valid
that contains the givenvalue
.- Type Parameters:
E
- type of the errorT
- type of the givenvalue
- Parameters:
value
- A value- Returns:
Valid(value)
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invalid
static <E,T> Validation<E,T> invalid(E error)
Creates anValidation.Invalid
that contains the givenerror
.- Type Parameters:
E
- type of the givenerror
T
- type of the value- Parameters:
error
- An error- Returns:
Invalid(error)
- Throws:
java.lang.NullPointerException
- if error is null
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fromEither
static <E,T> Validation<E,T> fromEither(Either<E,T> either)
Creates aValidation
of anEither
.- Type Parameters:
E
- error typeT
- value type- Parameters:
either
- AnEither
- Returns:
- A
Valid(either.get())
if either is a Right, otherwiseInvalid(either.getLeft())
. - Throws:
java.lang.NullPointerException
- if either is null
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fromTry
static <T> Validation<java.lang.Throwable,T> fromTry(Try<? extends T> t)
Creates aValidation
of anTry
.- Type Parameters:
T
- type of the valid value- Parameters:
t
- ATry
- Returns:
- A
Valid(t.get())
if t is a Success, otherwiseInvalid(t.getCause())
. - Throws:
java.lang.NullPointerException
- ift
is null
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sequence
static <E,T> Validation<Seq<E>,Seq<T>> sequence(java.lang.Iterable<? extends Validation<? extends Seq<? extends E>,? extends T>> values)
Reduces manyValidation
instances into a singleValidation
by transforming anIterable<Validation<? extends T>>
into aValidation<Seq<T>>
.- Type Parameters:
E
- value type in the case of invalidT
- value type in the case of valid- Parameters:
values
- An iterable of Validation instances.- Returns:
- A valid Validation of a sequence of values if all Validation instances are valid or an invalid Validation containing an accumulated List of errors.
- Throws:
java.lang.NullPointerException
- if values is null
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traverse
static <E,T,U> Validation<Seq<E>,Seq<U>> traverse(java.lang.Iterable<? extends T> values, java.util.function.Function<? super T,? extends Validation<? extends Seq<? extends E>,? extends U>> mapper)
Maps the values of an iterable to a sequence of mapped values into a singleValidation
by transforming anIterable<? extends T>
into aValidation<Seq<U>>
.- Type Parameters:
T
- The type of the given values.E
- The mapped error value type.U
- The mapped valid value type.- Parameters:
values
- AnIterable
of values.mapper
- A mapper of values to Validations- Returns:
- A
Validation
of aSeq
of results. - Throws:
java.lang.NullPointerException
- if values or f is null.
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narrow
static <E,T> Validation<E,T> narrow(Validation<? extends E,? extends T> validation)
Narrows a widenedValidation<? extends E, ? extends T>
toValidation<E, T>
by performing a type-safe cast. This is eligible because immutable/read-only collections are covariant.- Type Parameters:
E
- type of errorT
- type of valid value- Parameters:
validation
- AValidation
.- Returns:
- the given
validation
instance as narrowed typeValidation<E, T>
.
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combine
static <E,T1,T2> Validation.Builder<E,T1,T2> combine(Validation<E,T1> validation1, Validation<E,T2> validation2)
Combines twoValidation
s into aValidation.Builder
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid value- Parameters:
validation1
- first validationvalidation2
- second validation- Returns:
- an instance of Builder<E,T1,T2>
- Throws:
java.lang.NullPointerException
- if validation1 or validation2 is null
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combine
static <E,T1,T2,T3> Validation.Builder3<E,T1,T2,T3> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3)
Combines threeValidation
s into aValidation.Builder3
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validation- Returns:
- an instance of Builder3<E,T1,T2,T3>
- Throws:
java.lang.NullPointerException
- if validation1, validation2 or validation3 is null
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combine
static <E,T1,T2,T3,T4> Validation.Builder4<E,T1,T2,T3,T4> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4)
Combines fourValidation
s into aValidation.Builder4
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid valueT4
- type of fourth valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validationvalidation4
- fourth validation- Returns:
- an instance of Builder3<E,T1,T2,T3,T4>
- Throws:
java.lang.NullPointerException
- if validation1, validation2, validation3 or validation4 is null
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combine
static <E,T1,T2,T3,T4,T5> Validation.Builder5<E,T1,T2,T3,T4,T5> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5)
Combines fiveValidation
s into aValidation.Builder5
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid valueT4
- type of fourth valid valueT5
- type of fifth valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validationvalidation4
- fourth validationvalidation5
- fifth validation- Returns:
- an instance of Builder3<E,T1,T2,T3,T4,T5>
- Throws:
java.lang.NullPointerException
- if validation1, validation2, validation3, validation4 or validation5 is null
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combine
static <E,T1,T2,T3,T4,T5,T6> Validation.Builder6<E,T1,T2,T3,T4,T5,T6> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6)
Combines sixValidation
s into aValidation.Builder6
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid valueT4
- type of fourth valid valueT5
- type of fifth valid valueT6
- type of sixth valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validationvalidation4
- fourth validationvalidation5
- fifth validationvalidation6
- sixth validation- Returns:
- an instance of Builder3<E,T1,T2,T3,T4,T5,T6>
- Throws:
java.lang.NullPointerException
- if validation1, validation2, validation3, validation4, validation5 or validation6 is null
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combine
static <E,T1,T2,T3,T4,T5,T6,T7> Validation.Builder7<E,T1,T2,T3,T4,T5,T6,T7> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6, Validation<E,T7> validation7)
Combines sevenValidation
s into aValidation.Builder7
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid valueT4
- type of fourth valid valueT5
- type of fifth valid valueT6
- type of sixth valid valueT7
- type of seventh valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validationvalidation4
- fourth validationvalidation5
- fifth validationvalidation6
- sixth validationvalidation7
- seventh validation- Returns:
- an instance of Builder3<E,T1,T2,T3,T4,T5,T6,T7>
- Throws:
java.lang.NullPointerException
- if validation1, validation2, validation3, validation4, validation5, validation6 or validation7 is null
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combine
static <E,T1,T2,T3,T4,T5,T6,T7,T8> Validation.Builder8<E,T1,T2,T3,T4,T5,T6,T7,T8> combine(Validation<E,T1> validation1, Validation<E,T2> validation2, Validation<E,T3> validation3, Validation<E,T4> validation4, Validation<E,T5> validation5, Validation<E,T6> validation6, Validation<E,T7> validation7, Validation<E,T8> validation8)
Combines eightValidation
s into aValidation.Builder8
.- Type Parameters:
E
- type of errorT1
- type of first valid valueT2
- type of second valid valueT3
- type of third valid valueT4
- type of fourth valid valueT5
- type of fifth valid valueT6
- type of sixth valid valueT7
- type of seventh valid valueT8
- type of eighth valid value- Parameters:
validation1
- first validationvalidation2
- second validationvalidation3
- third validationvalidation4
- fourth validationvalidation5
- fifth validationvalidation6
- sixth validationvalidation7
- seventh validationvalidation8
- eighth validation- Returns:
- an instance of Builder3<E,T1,T2,T3,T4,T5,T6,T7,T8>
- Throws:
java.lang.NullPointerException
- if validation1, validation2, validation3, validation4, validation5, validation6, validation7 or validation8 is null
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isValid
boolean isValid()
Check whether this is of typeValid
- Returns:
- true if is a Valid, false if is an Invalid
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isInvalid
boolean isInvalid()
Check whether this is of typeInvalid
- Returns:
- true if is an Invalid, false if is a Valid
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orElse
default Validation<E,T> orElse(Validation<? extends E,? extends T> other)
Returns thisValidation
if it is valid, otherwise return the alternative.- Parameters:
other
- An alternativeValidation
- Returns:
- this
Validation
if it is valid, otherwise return the alternative.
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orElse
default Validation<E,T> orElse(java.util.function.Supplier<Validation<? extends E,? extends T>> supplier)
Returns thisValidation
if it is valid, otherwise return the result of evaluating supplier.- Parameters:
supplier
- An alternativeValidation
supplier- Returns:
- this
Validation
if it is valid, otherwise return the result of evaluating supplier.
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isEmpty
default boolean isEmpty()
Description copied from interface:Value
Checks, thisValue
is empty, i.e. if the underlying value is absent.
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get
T get()
Gets the value of thisValidation
if is aValid
or throws if this is anInvalid
.
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getOrElseGet
default T getOrElseGet(java.util.function.Function<? super E,? extends T> other)
Gets the value if it is a Valid or an value calculated from the error.- Parameters:
other
- a function which converts an error to an alternative value- Returns:
- the value, if the underlying Validation is a Valid, or else the alternative value
provided by
other
by applying the error.
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getError
E getError()
Gets the error of this Validation if it is anInvalid
or throws if this is aValid
.- Returns:
- The error, if present
- Throws:
java.lang.RuntimeException
- if this is aValid
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toEither
default Either<E,T> toEither()
Converts this Validation to anEither
.- Returns:
Either.right(get())
if this is valid, otherwiseEither.left(getError())
.
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equals
boolean equals(java.lang.Object o)
Description copied from interface:Value
Clarifies that values have a proper equals() method implemented.
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hashCode
int hashCode()
Description copied from interface:Value
Clarifies that values have a proper hashCode() method implemented.See Object.hashCode().
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toString
java.lang.String toString()
Description copied from interface:Value
Clarifies that values have a proper toString() method implemented.See Object.toString().
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forEach
default void forEach(java.util.function.Consumer<? super T> action)
Performs the given action for the value contained inValid
, or does nothing if this is anInvalid
.
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fold
default <U> U fold(java.util.function.Function<? super E,? extends U> ifInvalid, java.util.function.Function<? super T,? extends U> ifValid)
Transforms thisValidation
to a value of typeU
.Example:
Validation<List<String>, String> valid = ...;<br> int i = valid.fold(List::length, String::length);
- Type Parameters:
U
- the fold result type- Parameters:
ifInvalid
- an error mapperifValid
- an mapper for a valid value- Returns:
ifValid.apply(get())
if this is valid, otherwiseifInvalid.apply(getError())
.- Throws:
java.lang.NullPointerException
- if one of the given mappersifInvalid
orifValid
is null
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swap
default Validation<T,E> swap()
Flip the valid/invalid values for this Validation. If this is a Valid<E,T>, returns Invalid<T,E>. Or if this is an Invalid<E,T>, return a Valid<T,E>.- Returns:
- a flipped instance of Validation
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map
default <U> Validation<E,U> map(java.util.function.Function<? super T,? extends U> f)
Description copied from interface:Value
Maps the underlying value to a different component type.
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bimap
default <E2,T2> Validation<E2,T2> bimap(java.util.function.Function<? super E,? extends E2> errorMapper, java.util.function.Function<? super T,? extends T2> valueMapper)
Whereas map only performs a mapping on a valid Validation, and mapError performs a mapping on an invalid Validation, bimap allows you to provide mapping actions for both, and will give you the result based on what type of Validation this is. Without this, you would have to do something like: validation.map(...).mapError(...);- Type Parameters:
E2
- type of the mapping result if this is an invalidT2
- type of the mapping result if this is a valid- Parameters:
errorMapper
- the invalid mapping operationvalueMapper
- the valid mapping operation- Returns:
- an instance of Validation<U,R>
- Throws:
java.lang.NullPointerException
- if invalidMapper or validMapper is null
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mapError
default <U> Validation<U,T> mapError(java.util.function.Function<? super E,? extends U> f)
Applies a function f to the error of this Validation if this is an Invalid. Otherwise does nothing if this is a Valid.- Type Parameters:
U
- type of the error resulting from the mapping- Parameters:
f
- a function that maps the error in this Invalid- Returns:
- an instance of Validation<U,T>
- Throws:
java.lang.NullPointerException
- if mapping operation f is null
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ap
default <U> Validation<Seq<E>,U> ap(Validation<Seq<E>,? extends java.util.function.Function<? super T,? extends U>> validation)
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combine
default <U> Validation.Builder<E,T,U> combine(Validation<E,U> validation)
Combines twoValidation
s to form aValidation.Builder
, which can then be used to perform further combines, or apply a function to it in order to transform theValidation.Builder
into aValidation
.- Type Parameters:
U
- type of the value contained in validation- Parameters:
validation
- the validation object to combine this with- Returns:
- an instance of Builder
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filter
default Option<Validation<E,T>> filter(java.util.function.Predicate<? super T> predicate)
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flatMap
default <U> Validation<E,U> flatMap(java.util.function.Function<? super T,? extends Validation<E,? extends U>> mapper)
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peek
default Validation<E,T> peek(java.util.function.Consumer<? super T> action)
Description copied from interface:Value
Performs the givenaction
on the first element if this is an eager implementation. Performs the givenaction
on all elements (the first immediately, successive deferred), if this is a lazy implementation.
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isAsync
default boolean isAsync()
AValidation
's value is computed synchronously.
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isLazy
default boolean isLazy()
AValidation
's value is computed eagerly.
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isSingleValued
default boolean isSingleValued()
Description copied from interface:Value
States whether this is a single-valued type.- Specified by:
isSingleValued
in interfaceValue<E>
- Returns:
true
if this is single-valued,false
otherwise.
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