Package org.eclipse.collections.api.bag

Interface ImmutableBag<T>

All Superinterfaces:

Bag<T>, ImmutableBagIterable<T>, ImmutableCollection<T>, InternalIterable<T>, Iterable<T>, RichIterable<T>, UnsortedBag<T>

public interface ImmutableBag<T>
extends UnsortedBag<T>, ImmutableBagIterable<T>

Since:

1.0

Method Summary

Modifier and Type	Method	Description
ImmutableList<ObjectIntPair<T>>	bottomOccurrences(int count)	Returns the count least frequently occurring items.
<V> ImmutableBag<V>	collect(Function<? super T,? extends V> function)	Returns a new collection with the results of applying the specified function on each element of the source collection.
ImmutableBooleanBag	collectBoolean(BooleanFunction<? super T> booleanFunction)	Returns a new primitive boolean iterable with the results of applying the specified function on each element of the source collection.
ImmutableByteBag	collectByte(ByteFunction<? super T> byteFunction)	Returns a new primitive byte iterable with the results of applying the specified function on each element of the source collection.
ImmutableCharBag	collectChar(CharFunction<? super T> charFunction)	Returns a new primitive char iterable with the results of applying the specified function on each element of the source collection.
ImmutableDoubleBag	collectDouble(DoubleFunction<? super T> doubleFunction)	Returns a new primitive double iterable with the results of applying the specified function on each element of the source collection.
ImmutableFloatBag	collectFloat(FloatFunction<? super T> floatFunction)	Returns a new primitive float iterable with the results of applying the specified function on each element of the source collection.
<V> ImmutableBag<V>	collectIf(Predicate<? super T> predicate, Function<? super T,? extends V> function)	Returns a new collection with the results of applying the specified function on each element of the source collection, but only for those elements which return true upon evaluation of the predicate.
ImmutableIntBag	collectInt(IntFunction<? super T> intFunction)	Returns a new primitive int iterable with the results of applying the specified function on each element of the source collection.
ImmutableLongBag	collectLong(LongFunction<? super T> longFunction)	Returns a new primitive long iterable with the results of applying the specified function on each element of the source collection.
ImmutableShortBag	collectShort(ShortFunction<? super T> shortFunction)	Returns a new primitive short iterable with the results of applying the specified function on each element of the source collection.
<P, V> ImmutableBag<V>	collectWith(Function2<? super T,? super P,? extends V> function, P parameter)	Same as RichIterable.collect(Function) with a Function2 and specified parameter which is passed to the block.
<V> ImmutableBag<V>	collectWithOccurrences(ObjectIntToObjectFunction<? super T,? extends V> function)	Iterates over the unique elements and their occurrences and collects the results of applying the specified function.
default <V> ImmutableBag<V>	countBy(Function<? super T,? extends V> function)	This method will count the number of occurrences of each value calculated by applying the function to each element of the collection.
default <V> ImmutableBag<V>	countByEach(Function<? super T,? extends Iterable<V>> function)	This method will count the number of occurrences of each value calculated by applying the function to each element of the collection.
default <V, P> ImmutableBag<V>	countByWith(Function2<? super T,? super P,? extends V> function, P parameter)	This method will count the number of occurrences of each value calculated by applying the function to each element of the collection with the specified parameter as the second argument.
<V> ImmutableBag<V>	flatCollect(Function<? super T,? extends Iterable<V>> function)	flatCollect is a special case of RichIterable.collect(Function).
default <P, V> ImmutableBag<V>	flatCollectWith(Function2<? super T,? super P,? extends Iterable<V>> function, P parameter)	Same as flatCollect, only with a Function2 that is passed an extra parameter.
<V> ImmutableBagMultimap<V,T>	groupBy(Function<? super T,? extends V> function)	For each element of the iterable, the function is evaluated and the results of these evaluations are collected into a new multimap, where the transformed value is the key and the original values are added to the same (or similar) species of collection as the source iterable.
<V> ImmutableBagMultimap<V,T>	groupByEach(Function<? super T,? extends Iterable<V>> function)	Similar to RichIterable.groupBy(Function), except the result of evaluating function will return a collection of keys for each value.
ImmutableBag<T>	newWith(T element)	This method is similar to the with method in MutableCollection with the difference that a new copy of this collection with the element appended will be returned.
ImmutableBag<T>	newWithAll(Iterable<? extends T> elements)	This method is similar to the withAll method in MutableCollection with the difference that a new copy of this collection with the elements appended will be returned.
ImmutableBag<T>	newWithout(T element)	This method is similar to the without method in MutableCollection with the difference that a new copy of this collection with the element removed will be returned.
ImmutableBag<T>	newWithoutAll(Iterable<? extends T> elements)	This method is similar to the withoutAll method in MutableCollection with the difference that a new copy of this collection with the elements removed will be returned.
PartitionImmutableBag<T>	partition(Predicate<? super T> predicate)	Filters a collection into a PartitionedIterable based on the evaluation of the predicate.
<P> PartitionImmutableBag<T>	partitionWith(Predicate2<? super T,? super P> predicate, P parameter)	Filters a collection into a PartitionIterable based on the evaluation of the predicate.
ImmutableBag<T>	reject(Predicate<? super T> predicate)	Returns all elements of the source collection that return false when evaluating of the predicate.
<P> ImmutableBag<T>	rejectWith(Predicate2<? super T,? super P> predicate, P parameter)	Similar to RichIterable.reject(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
ImmutableBag<T>	select(Predicate<? super T> predicate)	Returns all elements of the source collection that return true when evaluating the predicate.
ImmutableBag<T>	selectByOccurrences(IntPredicate predicate)	Returns all elements of the bag that have a number of occurrences that satisfy the predicate.
default ImmutableBag<T>	selectDuplicates()	Returns all elements of the bag that have more than one occurrence.
<S> ImmutableBag<S>	selectInstancesOf(Class<S> clazz)	Returns all elements of the source collection that are instances of the Class clazz.
default ImmutableSet<T>	selectUnique()	Returns a set containing all elements of the bag that have exactly one occurrence.
<P> ImmutableBag<T>	selectWith(Predicate2<? super T,? super P> predicate, P parameter)	Similar to RichIterable.select(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
ImmutableBag<T>	tap(Procedure<? super T> procedure)	Executes the Procedure for each element in the iterable and returns this.
default ImmutableBag<T>	toImmutableBag()	Overrides toImmutableBag in RichIterable to return this.
ImmutableList<ObjectIntPair<T>>	topOccurrences(int count)	Returns the count most frequently occurring items.
<S> ImmutableBag<Pair<T,S>>	zip(Iterable<S> that)	Deprecated. in 6.0.
ImmutableSet<Pair<T,Integer>>	zipWithIndex()	Deprecated. in 6.0.

Methods inherited from interface org.eclipse.collections.api.bag.Bag

aggregateBy, allSatisfyWithOccurrences, anySatisfyWithOccurrences, collectWithOccurrences, detectWithOccurrences, distinctView, equals, forEachWithOccurrences, hashCode, noneSatisfyWithOccurrences, occurrencesOf, reduceBy, reduceInPlace, reduceInPlace, sizeDistinct, summarizeDouble, summarizeFloat, summarizeInt, summarizeLong, toImmutable, toStringOfItemToCount

Methods inherited from interface org.eclipse.collections.api.bag.ImmutableBagIterable

toMapOfItemToCount

Methods inherited from interface org.eclipse.collections.api.collection.ImmutableCollection

aggregateBy, aggregateInPlaceBy, castToCollection, groupByUniqueKey, parallelStream, reduceBy, spliterator, stream, sumByDouble, sumByFloat, sumByInt, sumByLong

Methods inherited from interface org.eclipse.collections.api.InternalIterable

forEach, forEachWith, forEachWithIndex

Methods inherited from interface java.lang.Iterable

iterator

Methods inherited from interface org.eclipse.collections.api.RichIterable

allSatisfy, allSatisfyWith, anySatisfy, anySatisfyWith, appendString, appendString, appendString, asLazy, chunk, collect, collectBoolean, collectByte, collectChar, collectDouble, collectFloat, collectIf, collectInt, collectLong, collectShort, collectWith, contains, containsAll, containsAllArguments, containsAllIterable, containsAny, containsAnyIterable, containsBy, containsNone, containsNoneIterable, count, countBy, countByEach, countByWith, countWith, detect, detectIfNone, detectOptional, detectWith, detectWithIfNone, detectWithOptional, each, flatCollect, flatCollectBoolean, flatCollectByte, flatCollectChar, flatCollectDouble, flatCollectFloat, flatCollectInt, flatCollectLong, flatCollectShort, flatCollectWith, forEach, getAny, getFirst, getLast, getOnly, groupBy, groupByAndCollect, groupByEach, groupByUniqueKey, injectInto, injectInto, injectInto, injectInto, injectInto, injectIntoDouble, injectIntoFloat, injectIntoInt, injectIntoLong, into, isEmpty, makeString, makeString, makeString, makeString, max, max, maxBy, maxByOptional, maxOptional, maxOptional, min, min, minBy, minByOptional, minOptional, minOptional, noneSatisfy, noneSatisfyWith, notEmpty, reduce, reject, rejectWith, select, selectWith, size, sumOfDouble, sumOfFloat, sumOfInt, sumOfLong, toArray, toArray, toBag, toBiMap, toImmutableBiMap, toImmutableList, toImmutableMap, toImmutableSet, toImmutableSortedBag, toImmutableSortedBag, toImmutableSortedBagBy, toImmutableSortedList, toImmutableSortedList, toImmutableSortedListBy, toImmutableSortedSet, toImmutableSortedSet, toImmutableSortedSetBy, toList, toMap, toMap, toSet, toSortedBag, toSortedBag, toSortedBagBy, toSortedList, toSortedList, toSortedListBy, toSortedMap, toSortedMap, toSortedMapBy, toSortedSet, toSortedSet, toSortedSetBy, toString, zip, zipWithIndex

Method Details

newWith

ImmutableBag<T> newWith(T element)

Description copied from interface: ImmutableCollection

This method is similar to the with method in MutableCollection with the difference that a new copy of this collection with the element appended will be returned.

Specified by:

newWith in interface ImmutableCollection<T>

newWithout

ImmutableBag<T> newWithout(T element)

Description copied from interface: ImmutableCollection

This method is similar to the without method in MutableCollection with the difference that a new copy of this collection with the element removed will be returned.

Specified by:

newWithout in interface ImmutableCollection<T>

newWithAll

ImmutableBag<T> newWithAll(Iterable<? extends T> elements)

Description copied from interface: ImmutableCollection

This method is similar to the withAll method in MutableCollection with the difference that a new copy of this collection with the elements appended will be returned.

Specified by:

newWithAll in interface ImmutableCollection<T>

newWithoutAll

ImmutableBag<T> newWithoutAll(Iterable<? extends T> elements)

Description copied from interface: ImmutableCollection

This method is similar to the withoutAll method in MutableCollection with the difference that a new copy of this collection with the elements removed will be returned.

Specified by:

newWithoutAll in interface ImmutableCollection<T>

selectByOccurrences

ImmutableBag<T> selectByOccurrences(IntPredicate predicate)

Description copied from interface: Bag

Returns all elements of the bag that have a number of occurrences that satisfy the predicate.

Specified by:

selectByOccurrences in interface Bag<T>

Specified by:

selectByOccurrences in interface ImmutableBagIterable<T>

Specified by:

selectByOccurrences in interface UnsortedBag<T>

selectDuplicates

default ImmutableBag<T> selectDuplicates()

Description copied from interface: Bag

Returns all elements of the bag that have more than one occurrence.

Specified by:

selectDuplicates in interface Bag<T>

Specified by:

selectDuplicates in interface ImmutableBagIterable<T>

Specified by:

selectDuplicates in interface UnsortedBag<T>

Since:

9.2

selectUnique

default ImmutableSet<T> selectUnique()

Description copied from interface: Bag

Returns a set containing all elements of the bag that have exactly one occurrence.

Specified by:

selectUnique in interface Bag<T>

Specified by:

selectUnique in interface ImmutableBagIterable<T>

Specified by:

selectUnique in interface UnsortedBag<T>

Since:

9.2

tap

ImmutableBag<T> tap(Procedure<? super T> procedure)

Description copied from interface: RichIterable

Executes the Procedure for each element in the iterable and returns this.

Example using a Java 8 lambda expression:

 RichIterable<Person> tapped =
     people.tap(person -> LOGGER.info(person.getName()));
 

Specified by:

tap in interface Bag<T>

Specified by:

tap in interface ImmutableBagIterable<T>

Specified by:

tap in interface ImmutableCollection<T>

Specified by:

tap in interface RichIterable<T>

Specified by:

tap in interface UnsortedBag<T>

See Also:

• RichIterable.each(Procedure)
• RichIterable.forEach(Procedure)

select

ImmutableBag<T> select(Predicate<? super T> predicate)

Description copied from interface: RichIterable

Returns all elements of the source collection that return true when evaluating the predicate. This method is also commonly called filter.

Example using a Java 8 lambda expression:

 RichIterable<Person> selected =
     people.select(person -> person.getAddress().getCity().equals("London"));
 

Specified by:

select in interface Bag<T>

Specified by:

select in interface ImmutableBagIterable<T>

Specified by:

select in interface ImmutableCollection<T>

Specified by:

select in interface RichIterable<T>

Specified by:

select in interface UnsortedBag<T>

selectWith

<P> ImmutableBag<T> selectWith(Predicate2<? super T,? super P> predicate,
 P parameter)

Description copied from interface: RichIterable

Similar to RichIterable.select(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.

E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years

Example using a Java 8 lambda expression:

 RichIterable<Person> selected =
     people.selectWith((Person person, Integer age) -> person.getAge()>= age, Integer.valueOf(18));
 

Specified by:

selectWith in interface Bag<T>

Specified by:

selectWith in interface ImmutableBagIterable<T>

Specified by:

selectWith in interface ImmutableCollection<T>

Specified by:

selectWith in interface RichIterable<T>

Specified by:

selectWith in interface UnsortedBag<T>

Parameters:

predicate - a Predicate2 to use as the select criteria

parameter - a parameter to pass in for evaluation of the second argument P in predicate

See Also:

• RichIterable.select(Predicate)

reject

ImmutableBag<T> reject(Predicate<? super T> predicate)

Description copied from interface: RichIterable

Returns all elements of the source collection that return false when evaluating of the predicate. This method is also sometimes called filterNot and is the equivalent of calling iterable.select(Predicates.not(predicate)).

Example using a Java 8 lambda expression:

 RichIterable<Person> rejected =
     people.reject(person -> person.person.getLastName().equals("Smith"));
 

Specified by:

reject in interface Bag<T>

Specified by:

reject in interface ImmutableBagIterable<T>

Specified by:

reject in interface ImmutableCollection<T>

Specified by:

reject in interface RichIterable<T>

Specified by:

reject in interface UnsortedBag<T>

Parameters:

predicate - a Predicate to use as the reject criteria

Returns:

a RichIterable that contains elements that cause Predicate.accept(Object) method to evaluate to false

rejectWith

<P> ImmutableBag<T> rejectWith(Predicate2<? super T,? super P> predicate,
 P parameter)

Description copied from interface: RichIterable

Similar to RichIterable.reject(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.

E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years

Example using a Java 8 lambda expression:

 RichIterable<Person> rejected =
     people.rejectWith((Person person, Integer age) -> person.getAge() < age, Integer.valueOf(18));
 

Specified by:

rejectWith in interface Bag<T>

Specified by:

rejectWith in interface ImmutableBagIterable<T>

Specified by:

rejectWith in interface ImmutableCollection<T>

Specified by:

rejectWith in interface RichIterable<T>

Specified by:

rejectWith in interface UnsortedBag<T>

Parameters:

predicate - a Predicate2 to use as the select criteria

parameter - a parameter to pass in for evaluation of the second argument P in predicate

See Also:

• RichIterable.select(Predicate)

partition

PartitionImmutableBag<T> partition(Predicate<? super T> predicate)

Description copied from interface: RichIterable

Filters a collection into a PartitionedIterable based on the evaluation of the predicate.

Example using a Java 8 lambda expression:

 PartitionIterable<Person> newYorkersAndNonNewYorkers =
     people.partition(person -> person.getAddress().getState().getName().equals("New York"));
 

Specified by:

partition in interface Bag<T>

Specified by:

partition in interface ImmutableBagIterable<T>

Specified by:

partition in interface ImmutableCollection<T>

Specified by:

partition in interface RichIterable<T>

Specified by:

partition in interface UnsortedBag<T>

partitionWith

<P> PartitionImmutableBag<T> partitionWith(Predicate2<? super T,? super P> predicate,
 P parameter)

Description copied from interface: RichIterable

Filters a collection into a PartitionIterable based on the evaluation of the predicate.

Example using a Java 8 lambda expression:

 PartitionIterable<Person> newYorkersAndNonNewYorkers =
     people.partitionWith((Person person, String state) -> person.getAddress().getState().getName().equals(state), "New York");
 

Specified by:

partitionWith in interface Bag<T>

Specified by:

partitionWith in interface ImmutableBagIterable<T>

Specified by:

partitionWith in interface ImmutableCollection<T>

Specified by:

partitionWith in interface RichIterable<T>

selectInstancesOf

<S> ImmutableBag<S> selectInstancesOf(Class<S> clazz)

Description copied from interface: RichIterable

Returns all elements of the source collection that are instances of the Class clazz.

 RichIterable<Integer> integers =
     List.mutable.with(new Integer(0), new Long(0L), new Double(0.0)).selectInstancesOf(Integer.class);
 

Specified by:

selectInstancesOf in interface Bag<T>

Specified by:

selectInstancesOf in interface ImmutableBagIterable<T>

Specified by:

selectInstancesOf in interface ImmutableCollection<T>

Specified by:

selectInstancesOf in interface RichIterable<T>

Specified by:

selectInstancesOf in interface UnsortedBag<T>

collect

<V> ImmutableBag<V> collect(Function<? super T,? extends V> function)

Description copied from interface: RichIterable

Returns a new collection with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 RichIterable<String> names =
     people.collect(person -> person.getFirstName() + " " + person.getLastName());
 

Specified by:

collect in interface ImmutableCollection<T>

Specified by:

collect in interface RichIterable<T>

Specified by:

collect in interface UnsortedBag<T>

collectBoolean

ImmutableBooleanBag collectBoolean(BooleanFunction<? super T> booleanFunction)

Description copied from interface: RichIterable

Returns a new primitive boolean iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 BooleanIterable licenses =
     people.collectBoolean(person -> person.hasDrivingLicense());
 

Specified by:

collectBoolean in interface ImmutableCollection<T>

Specified by:

collectBoolean in interface RichIterable<T>

Specified by:

collectBoolean in interface UnsortedBag<T>

collectByte

ImmutableByteBag collectByte(ByteFunction<? super T> byteFunction)

Description copied from interface: RichIterable

Returns a new primitive byte iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 ByteIterable bytes =
     people.collectByte(person -> person.getCode());
 

Specified by:

collectByte in interface ImmutableCollection<T>

Specified by:

collectByte in interface RichIterable<T>

Specified by:

collectByte in interface UnsortedBag<T>

collectChar

ImmutableCharBag collectChar(CharFunction<? super T> charFunction)

Description copied from interface: RichIterable

Returns a new primitive char iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 CharIterable chars =
     people.collectChar(person -> person.getMiddleInitial());
 

Specified by:

collectChar in interface ImmutableCollection<T>

Specified by:

collectChar in interface RichIterable<T>

Specified by:

collectChar in interface UnsortedBag<T>

collectDouble

ImmutableDoubleBag collectDouble(DoubleFunction<? super T> doubleFunction)

Description copied from interface: RichIterable

Returns a new primitive double iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 DoubleIterable doubles =
     people.collectDouble(person -> person.getMilesFromNorthPole());
 

Specified by:

collectDouble in interface ImmutableCollection<T>

Specified by:

collectDouble in interface RichIterable<T>

Specified by:

collectDouble in interface UnsortedBag<T>

collectFloat

ImmutableFloatBag collectFloat(FloatFunction<? super T> floatFunction)

Description copied from interface: RichIterable

Returns a new primitive float iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 FloatIterable floats =
     people.collectFloat(person -> person.getHeightInInches());
 

Specified by:

collectFloat in interface ImmutableCollection<T>

Specified by:

collectFloat in interface RichIterable<T>

Specified by:

collectFloat in interface UnsortedBag<T>

collectInt

ImmutableIntBag collectInt(IntFunction<? super T> intFunction)

Description copied from interface: RichIterable

Returns a new primitive int iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 IntIterable ints =
     people.collectInt(person -> person.getAge());
 

Specified by:

collectInt in interface ImmutableCollection<T>

Specified by:

collectInt in interface RichIterable<T>

Specified by:

collectInt in interface UnsortedBag<T>

collectLong

ImmutableLongBag collectLong(LongFunction<? super T> longFunction)

Description copied from interface: RichIterable

Returns a new primitive long iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 LongIterable longs =
     people.collectLong(person -> person.getGuid());
 

Specified by:

collectLong in interface ImmutableCollection<T>

Specified by:

collectLong in interface RichIterable<T>

Specified by:

collectLong in interface UnsortedBag<T>

collectShort

ImmutableShortBag collectShort(ShortFunction<? super T> shortFunction)

Description copied from interface: RichIterable

Returns a new primitive short iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.

Example using a Java 8 lambda expression:

 ShortIterable shorts =
     people.collectShort(person -> person.getNumberOfJunkMailItemsReceivedPerMonth());
 

Specified by:

collectShort in interface ImmutableCollection<T>

Specified by:

collectShort in interface RichIterable<T>

Specified by:

collectShort in interface UnsortedBag<T>

collectWith

<P,
V> ImmutableBag<V> collectWith(Function2<? super T,? super P,? extends V> function,
 P parameter)

Description copied from interface: RichIterable

Same as RichIterable.collect(Function) with a Function2 and specified parameter which is passed to the block.

Example using a Java 8 lambda expression:

 RichIterable<Integer> integers =
     Lists.mutable.with(1, 2, 3).collectWith((each, parameter) -> each + parameter, Integer.valueOf(1));
 

Specified by:

collectWith in interface ImmutableCollection<T>

Specified by:

collectWith in interface RichIterable<T>

Specified by:

collectWith in interface UnsortedBag<T>

Parameters:

function - A Function2 to use as the collect transformation function

parameter - A parameter to pass in for evaluation of the second argument P in function

Returns:

A new RichIterable that contains the transformed elements returned by Function2.value(Object, Object)

See Also:

• RichIterable.collect(Function)

collectIf

<V> ImmutableBag<V> collectIf(Predicate<? super T> predicate,
 Function<? super T,? extends V> function)

Description copied from interface: RichIterable

Returns a new collection with the results of applying the specified function on each element of the source collection, but only for those elements which return true upon evaluation of the predicate. This is the optimized equivalent of calling iterable.select(predicate).collect(function).

Example using a Java 8 lambda and method reference:

 RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(e -> e != null, Object::toString);
 

Example using Predicates factory:

 RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(Predicates.notNull(), Functions.getToString());
 

Specified by:

collectIf in interface ImmutableCollection<T>

Specified by:

collectIf in interface RichIterable<T>

Specified by:

collectIf in interface UnsortedBag<T>

collectWithOccurrences

<V> ImmutableBag<V> collectWithOccurrences(ObjectIntToObjectFunction<? super T,? extends V> function)

Description copied from interface: Bag

Iterates over the unique elements and their occurrences and collects the results of applying the specified function.

Specified by:

collectWithOccurrences in interface Bag<T>

Specified by:

collectWithOccurrences in interface ImmutableBagIterable<T>

Specified by:

collectWithOccurrences in interface UnsortedBag<T>

flatCollect

<V> ImmutableBag<V> flatCollect(Function<? super T,? extends Iterable<V>> function)

Description copied from interface: RichIterable

flatCollect is a special case of RichIterable.collect(Function). With collect, when the Function returns a collection, the result is a collection of collections. flatCollect outputs a single "flattened" collection instead. This method is commonly called flatMap.

Consider the following example where we have a Person class, and each Person has a list of Address objects. Take the following Function:

 Function<Person, List<Address>> addressFunction = Person::getAddresses;
 RichIterable<Person> people = ...;
 

Using collect returns a collection of collections of addresses.

 RichIterable<List<Address>> addresses = people.collect(addressFunction);
 

Using flatCollect returns a single flattened list of addresses.

 RichIterable<Address> addresses = people.flatCollect(addressFunction);
 

Specified by:

flatCollect in interface ImmutableCollection<T>

Specified by:

flatCollect in interface RichIterable<T>

Specified by:

flatCollect in interface UnsortedBag<T>

Parameters:

function - The Function to apply

Returns:

a new flattened collection produced by applying the given function

flatCollectWith

default <P,
V> ImmutableBag<V> flatCollectWith(Function2<? super T,? super P,? extends Iterable<V>> function,
 P parameter)

Description copied from interface: RichIterable

Same as flatCollect, only with a Function2 that is passed an extra parameter.

Specified by:

flatCollectWith in interface ImmutableCollection<T>

Specified by:

flatCollectWith in interface RichIterable<T>

Specified by:

flatCollectWith in interface UnsortedBag<T>

Since:

9.2

countBy

default <V> ImmutableBag<V> countBy(Function<? super T,? extends V> function)

Description copied from interface: RichIterable

This method will count the number of occurrences of each value calculated by applying the function to each element of the collection.

Specified by:

countBy in interface ImmutableCollection<T>

Specified by:

countBy in interface RichIterable<T>

Since:

9.0

countByWith

default <V,
P> ImmutableBag<V> countByWith(Function2<? super T,? super P,? extends V> function,
 P parameter)

Description copied from interface: RichIterable

This method will count the number of occurrences of each value calculated by applying the function to each element of the collection with the specified parameter as the second argument.

Specified by:

countByWith in interface ImmutableCollection<T>

Specified by:

countByWith in interface RichIterable<T>

Since:

9.0

countByEach

default <V> ImmutableBag<V> countByEach(Function<? super T,? extends Iterable<V>> function)

Description copied from interface: RichIterable

This method will count the number of occurrences of each value calculated by applying the function to each element of the collection.

Specified by:

countByEach in interface ImmutableCollection<T>

Specified by:

countByEach in interface RichIterable<T>

Since:

10.0.0

groupBy

<V> ImmutableBagMultimap<V,T> groupBy(Function<? super T,? extends V> function)

Description copied from interface: RichIterable

For each element of the iterable, the function is evaluated and the results of these evaluations are collected into a new multimap, where the transformed value is the key and the original values are added to the same (or similar) species of collection as the source iterable.

Example using a Java 8 method reference:

 Multimap<String, Person> peopleByLastName =
     people.groupBy(Person::getLastName);
 

Specified by:

groupBy in interface Bag<T>

Specified by:

groupBy in interface ImmutableBagIterable<T>

Specified by:

groupBy in interface ImmutableCollection<T>

Specified by:

groupBy in interface RichIterable<T>

Specified by:

groupBy in interface UnsortedBag<T>

groupByEach

<V> ImmutableBagMultimap<V,T> groupByEach(Function<? super T,? extends Iterable<V>> function)

Description copied from interface: RichIterable

Similar to RichIterable.groupBy(Function), except the result of evaluating function will return a collection of keys for each value.

Specified by:

groupByEach in interface Bag<T>

Specified by:

groupByEach in interface ImmutableBagIterable<T>

Specified by:

groupByEach in interface ImmutableCollection<T>

Specified by:

groupByEach in interface RichIterable<T>

Specified by:

groupByEach in interface UnsortedBag<T>

zip

@Deprecated
<S> ImmutableBag<Pair<T,S>> zip(Iterable<S> that)

Deprecated.

in 6.0. Use OrderedIterable.zip(Iterable) instead.

Description copied from interface: RichIterable

Returns a RichIterable formed from this RichIterable and another RichIterable by combining corresponding elements in pairs. If one of the two RichIterables is longer than the other, its remaining elements are ignored.

Specified by:

zip in interface ImmutableCollection<T>

Specified by:

zip in interface RichIterable<T>

Specified by:

zip in interface UnsortedBag<T>

Type Parameters:

S - the type of the second half of the returned pairs

Parameters:

that - The RichIterable providing the second half of each result pair

Returns:

A new RichIterable containing pairs consisting of corresponding elements of this RichIterable and that. The length of the returned RichIterable is the minimum of the lengths of this RichIterable and that.

zipWithIndex

@Deprecated
ImmutableSet<Pair<T,Integer>> zipWithIndex()

Deprecated.

in 6.0. Use OrderedIterable.zipWithIndex() instead.

Description copied from interface: RichIterable

Zips this RichIterable with its indices.

Specified by:

zipWithIndex in interface Bag<T>

Specified by:

zipWithIndex in interface ImmutableBagIterable<T>

Specified by:

zipWithIndex in interface ImmutableCollection<T>

Specified by:

zipWithIndex in interface RichIterable<T>

Specified by:

zipWithIndex in interface UnsortedBag<T>

Returns:

A new RichIterable containing pairs consisting of all elements of this RichIterable paired with their index. Indices start at 0.

See Also:

• RichIterable.zip(Iterable)

topOccurrences

ImmutableList<ObjectIntPair<T>> topOccurrences(int count)

Description copied from interface: Bag

Returns the count most frequently occurring items. In the event of a tie, all the items with the number of occurrences that match the occurrences of the last item will be returned.

Specified by:

topOccurrences in interface Bag<T>

Since:

6.0

bottomOccurrences

ImmutableList<ObjectIntPair<T>> bottomOccurrences(int count)

Description copied from interface: Bag

Returns the count least frequently occurring items. In the event of a tie, all of the items with the number of occurrences that match the occurrences of the last item will be returned.

Specified by:

bottomOccurrences in interface Bag<T>

Since:

6.0

toImmutableBag

default ImmutableBag<T> toImmutableBag()

Overrides toImmutableBag in RichIterable to return this.

Specified by:

toImmutableBag in interface RichIterable<T>

Since:

11.0