Package org.eclipse.collections.api.bag

Interface UnsortedBag<T>

All Superinterfaces:
Bag<T>, InternalIterable<T>, Iterable<T>, RichIterable<T>
All Known Subinterfaces:
ImmutableBag<T>, MultiReaderBag<T>, MutableBag<T>
All Known Implementing Classes:
AbstractHashBag, AbstractImmutableBag, AbstractMutableBag, HashBag, HashBagWithHashingStrategy, ImmutableArrayBag, ImmutableHashBag, MultiReaderHashBag, SynchronizedBag, UnmodifiableBag
public interface UnsortedBag<T>
extends Bag<T>

  • Method Details

    • tap

      UnsortedBag<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()));

      Example using an anonymous inner class: 

       RichIterable<Person> tapped =
     people.tap(new Procedure<Person>()
     {
         public void value(Person person)
         {
             LOGGER.info(person.getName());
         }
     });
      Specified by:
      tap in interface Bag<T>
      Specified by:
      tap in interface RichIterable<T>
      See Also:
      RichIterable.each(Procedure), RichIterable.forEach(Procedure)

    • selectByOccurrences

      UnsortedBag<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>

    • selectDuplicates

      default UnsortedBag<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>
      Since:
      9.2

    • selectUnique

      UnsortedSetIterable<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>
      Since:
      9.2

    • select

      UnsortedBag<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"));

      Example using an anonymous inner class: 

       RichIterable<Person> selected =
     people.select(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.getAddress().getCity().equals("London");
         }
     });
      Specified by:
      select in interface Bag<T>
      Specified by:
      select in interface RichIterable<T>

    • selectWith

      <P> UnsortedBag<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));

      Example using an anonymous inner class: 

       RichIterable<Person> selected =
     people.selectWith(new Predicate2<Person, Integer>()
     {
         public boolean accept(Person person, Integer age)
         {
             return person.getAge()>= age;
         }
     }, Integer.valueOf(18));
      Specified by:
      selectWith in interface Bag<T>
      Specified by:
      selectWith in interface RichIterable<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

      UnsortedBag<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"));

      Example using an anonymous inner class: 

       RichIterable<Person> rejected =
     people.reject(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.person.getLastName().equals("Smith");
         }
     });
      Specified by:
      reject in interface Bag<T>
      Specified by:
      reject in interface RichIterable<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> UnsortedBag<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));

      Example using an anonymous inner class: 

       MutableList<Person> rejected =
     people.rejectWith(new Predicate2<Person, Integer>()
     {
         public boolean accept(Person person, Integer age)
         {
             return person.getAge() < age;
         }
     }, Integer.valueOf(18));
      Specified by:
      rejectWith in interface Bag<T>
      Specified by:
      rejectWith in interface RichIterable<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)

    • selectInstancesOf

      <S> UnsortedBag<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 RichIterable<T>

    • partition

      PartitionUnsortedBag<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"));

      Example using an anonymous inner class: 

       PartitionIterable<Person> newYorkersAndNonNewYorkers =
     people.partition(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.getAddress().getState().getName().equals("New York");
         }
     });
      Specified by:
      partition in interface Bag<T>
      Specified by:
      partition in interface RichIterable<T>

    • collect

      <V> UnsortedBag<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());

      Example using an anonymous inner class: 

       RichIterable<String> names =
     people.collect(new Function<Person, String>()
     {
         public String valueOf(Person person)
         {
             return person.getFirstName() + " " + person.getLastName();
         }
     });
      Specified by:
      collect in interface RichIterable<T>

    • collectBoolean

      BooleanBag 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());

      Example using an anonymous inner class: 

       BooleanIterable licenses =
     people.collectBoolean(new BooleanFunction<Person>()
     {
         public boolean booleanValueOf(Person person)
         {
             return person.hasDrivingLicense();
         }
     });
      Specified by:
      collectBoolean in interface RichIterable<T>

    • collectByte

      ByteBag 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());

      Example using an anonymous inner class: 

       ByteIterable bytes =
     people.collectByte(new ByteFunction<Person>()
     {
         public byte byteValueOf(Person person)
         {
             return person.getCode();
         }
     });
      Specified by:
      collectByte in interface RichIterable<T>

    • collectChar

      CharBag 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());

      Example using an anonymous inner class: 

       CharIterable chars =
     people.collectChar(new CharFunction<Person>()
     {
         public char charValueOf(Person person)
         {
             return person.getMiddleInitial();
         }
     });
      Specified by:
      collectChar in interface RichIterable<T>

    • collectDouble

      DoubleBag 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());

      Example using an anonymous inner class: 

       DoubleIterable doubles =
     people.collectDouble(new DoubleFunction<Person>()
     {
         public double doubleValueOf(Person person)
         {
             return person.getMilesFromNorthPole();
         }
     });
      Specified by:
      collectDouble in interface RichIterable<T>

    • collectFloat

      FloatBag 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());

      Example using an anonymous inner class: 

       FloatIterable floats =
     people.collectFloat(new FloatFunction<Person>()
     {
         public float floatValueOf(Person person)
         {
             return person.getHeightInInches();
         }
     });
      Specified by:
      collectFloat in interface RichIterable<T>

    • collectInt

      IntBag 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());

      Example using an anonymous inner class: 

       IntIterable ints =
     people.collectInt(new IntFunction<Person>()
     {
         public int intValueOf(Person person)
         {
             return person.getAge();
         }
     });
      Specified by:
      collectInt in interface RichIterable<T>

    • collectLong

      LongBag 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());

      Example using an anonymous inner class: 

       LongIterable longs =
     people.collectLong(new LongFunction<Person>()
     {
         public long longValueOf(Person person)
         {
             return person.getGuid();
         }
     });
      Specified by:
      collectLong in interface RichIterable<T>

    • collectShort

      ShortBag 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());

      Example using an anonymous inner class: 

       ShortIterable shorts =
     people.collectShort(new ShortFunction<Person>()
     {
         public short shortValueOf(Person person)
         {
             return person.getNumberOfJunkMailItemsReceivedPerMonth();
         }
     });
      Specified by:
      collectShort in interface RichIterable<T>

    • collectWith

      <P,​ V> UnsortedBag<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));

      Example using an anonymous inner class: 

       Function2<Integer, Integer, Integer> addParameterFunction =
     new Function2<Integer, Integer, Integer>()
     {
         public Integer value(Integer each, Integer parameter)
         {
             return each + parameter;
         }
     };
 RichIterable<Integer> integers =
     Lists.mutable.with(1, 2, 3).collectWith(addParameterFunction, Integer.valueOf(1));
      Specified by:
      collectWith in interface RichIterable<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> UnsortedBag<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 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<T>

    • collectWithOccurrences

      <V> UnsortedBag<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>

    • flatCollect

      <V> UnsortedBag<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 RichIterable<T>
      Parameters:
      function - The Function to apply
      Returns:
      a new flattened collection produced by applying the given function

    • flatCollectWith

      default <P,​ V> UnsortedBag<V> flatCollectWith​(Function2<? super T,​? super P,​? extends Iterable<V>> function, P parameter)
      Specified by:
      flatCollectWith in interface RichIterable<T>
      Since:
      9.2

    • zip

      @Deprecated <S> UnsortedBag<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 RichIterable<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 UnsortedSetIterable<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 RichIterable<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)

    • groupBy

      <V> UnsortedBagMultimap<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);

      Example using an anonymous inner class: 

       Multimap<String, Person> peopleByLastName =
     people.groupBy(new Function<Person, String>()
     {
         public String valueOf(Person person)
         {
             return person.getLastName();
         }
     });
      Specified by:
      groupBy in interface Bag<T>
      Specified by:
      groupBy in interface RichIterable<T>

    • groupByEach

      <V> UnsortedBagMultimap<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 RichIterable<T>