Package org.eclipse.collections.api.map

Interface UnsortedMapIterable<K,V>

All Superinterfaces:
InternalIterable<V>, Iterable<V>, MapIterable<K,V>, RichIterable<V>
All Known Subinterfaces:
ConcurrentMutableMap<K,V>, FixedSizeMap<K,V>, ImmutableMap<K,V>, MutableMap<K,V>
public interface UnsortedMapIterable<K,V> extends MapIterable<K,V>
An iterable Map whose elements are unsorted.

  • Method Details

    • flip

      UnsortedSetMultimap<V,K> flip()
      Description copied from interface: MapIterable
      Given a map from Domain -> Range return a multimap from Range -> Domain. We chose the name 'flip' rather than 'invert' or 'transpose' since this method does not have the property of applying twice returns the original.

      Since the keys in the input are unique, the values in the output are unique, so the return type should be a SetMultimap. However, since SetMultimap and SortedSetMultimap don't inherit from one another, SetMultimap here does not allow SortedMapIterable to have a SortedSetMultimap return. Thus, we compromise and call this Multimap, even though all implementations will be a SetMultimap or SortedSetMultimap.

      Specified by:
      flip in interface MapIterable<K,V>

    • flipUniqueValues

      UnsortedMapIterable<V,K> flipUniqueValues()
      Description copied from interface: MapIterable
      Return the MapIterable that is obtained by flipping the direction of this map and making the associations from value to key. 
           MapIterable<Integer, String> map = this.newMapWithKeysValues(1, "1", 2, "2", 3, "3");
     MapIterable<String, Integer> result = map.flipUniqueValues();
     Assert.assertTrue(result.equals(UnifiedMap.newWithKeysValues("1", 1, "2", 2, "3", 3)));
      Specified by:
      flipUniqueValues in interface MapIterable<K,V>

    • tap

      UnsortedMapIterable<K,V> tap(Procedure<? super V> procedure)
      Description copied from interface: MapIterable
      Executes the Procedure for each value of the map and returns this. 
       return peopleByCity.tap(person -> LOGGER.info(person.getName()));
      Specified by:
      tap in interface MapIterable<K,V>
      Specified by:
      tap in interface RichIterable<K>
      See Also:

    • select

      UnsortedMapIterable<K,V> select(Predicate2<? super K,? super V> predicate)
      Description copied from interface: MapIterable
      For each key and value of the map the predicate is evaluated, if the result of the evaluation is true, that key and value are returned in a new map. 
       MapIterable<City, Person> selected =
     peopleByCity.select((city, person) -> city.getName().equals("Anytown") && person.getLastName().equals("Smith"));
      Specified by:
      select in interface MapIterable<K,V>

    • reject

      UnsortedMapIterable<K,V> reject(Predicate2<? super K,? super V> predicate)
      Description copied from interface: MapIterable
      For each key and value of the map the predicate is evaluated, if the result of the evaluation is false, that key and value are returned in a new map. 
       MapIterable<City, Person> rejected =
     peopleByCity.reject((city, person) -> city.getName().equals("Anytown") && person.getLastName().equals("Smith"));
      Specified by:
      reject in interface MapIterable<K,V>

    • collectValues

      <R> UnsortedMapIterable<K,R> collectValues(Function2<? super K,? super V,? extends R> function)
      Description copied from interface: MapIterable
      For each key and value of the map the function is evaluated. The results of these evaluations are returned in a new map. The map returned will use the values projected from the function rather than the original values. 
       MapIterable<City, String> collected =
     peopleByCity.collectValues((City city, Person person) -> person.getFirstName() + " " + person.getLastName());
      Specified by:
      collectValues in interface MapIterable<K,V>

    • collect

      <K2, V2> UnsortedMapIterable<K2,V2> collect(Function2<? super K,? super V,Pair<K2,V2>> function)
      Description copied from interface: MapIterable
      For each key and value of the map the function is evaluated. The results of these evaluations are returned in a new map. The map returned will use the values projected from the function rather than the original values. 
       MapIterable<String, String> collected =
     peopleByCity.collect((City city, Person person) -> Pair.of(city.getCountry(), person.getAddress().getCity()));
      Specified by:
      collect in interface MapIterable<K,V>

    • select

      Bag<V> select(Predicate<? super V> 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 RichIterable<K>

    • selectWith

      <P> Bag<V> selectWith(Predicate2<? super V,? 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 RichIterable<K>
      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:

    • reject

      Bag<V> reject(Predicate<? super V> 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 RichIterable<K>
      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> Bag<V> rejectWith(Predicate2<? super V,? 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 RichIterable<K>
      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:

    • partition

      PartitionBag<V> partition(Predicate<? super V> 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 RichIterable<K>

    • partitionWith

      <P> PartitionBag<V> partitionWith(Predicate2<? super V,? 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 RichIterable<K>

    • selectInstancesOf

      <S> Bag<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 RichIterable<K>

    • collect

      <V1> Bag<V1> collect(Function<? super V,? extends V1> 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 RichIterable<K>

    • collectBoolean

      BooleanBag collectBoolean(BooleanFunction<? super V> 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 RichIterable<K>

    • collectByte

      ByteBag collectByte(ByteFunction<? super V> 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 RichIterable<K>

    • collectChar

      CharBag collectChar(CharFunction<? super V> 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 RichIterable<K>

    • collectDouble

      DoubleBag collectDouble(DoubleFunction<? super V> 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 RichIterable<K>

    • collectFloat

      FloatBag collectFloat(FloatFunction<? super V> 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 RichIterable<K>

    • collectInt

      IntBag collectInt(IntFunction<? super V> 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 RichIterable<K>

    • collectLong

      LongBag collectLong(LongFunction<? super V> 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 RichIterable<K>

    • collectShort

      ShortBag collectShort(ShortFunction<? super V> 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 RichIterable<K>

    • collectWith

      <P, V1> Bag<V1> collectWith(Function2<? super V,? super P,? extends V1> 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 RichIterable<K>
      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:

    • collectIf

      <V1> Bag<V1> collectIf(Predicate<? super V> predicate, Function<? super V,? extends V1> 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 RichIterable<K>

    • flatCollect

      <V1> Bag<V1> flatCollect(Function<? super V,? extends Iterable<V1>> 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 RichIterable<K>
      Parameters:
      function - The Function to apply
      Returns:
      a new flattened collection produced by applying the given function

    • flatCollectWith

      default <P, V1> Bag<V1> flatCollectWith(Function2<? super V,? super P,? extends Iterable<V1>> 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 RichIterable<K>
      Since:
      9.2

    • groupBy

      <V1> BagMultimap<V1,V> groupBy(Function<? super V,? extends V1> 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 RichIterable<K>

    • groupByEach

      <V1> BagMultimap<V1,V> groupByEach(Function<? super V,? extends Iterable<V1>> 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 RichIterable<K>

    • groupByUniqueKey

      <V1> UnsortedMapIterable<V1,V> groupByUniqueKey(Function<? super V,? extends V1> 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 map, where the transformed value is the key. The generated keys must each be unique, or else an exception is thrown.
      Specified by:
      groupByUniqueKey in interface RichIterable<K>
      See Also:

    • zip

      @Deprecated <S> Bag<Pair<V,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 RichIterable<K>
      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 UnsortedSetIterable<Pair<V,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 RichIterable<K>
      Returns:
      A new RichIterable containing pairs consisting of all elements of this RichIterable paired with their index. Indices start at 0.
      See Also:

    • toImmutable

      ImmutableMap<K,V> toImmutable()
      Converts the UnsortedMapIterable to an immutable implementation. Returns this for immutable maps.
      Specified by:
      toImmutable in interface MapIterable<K,V>
      Since:
      5.0