Class ImmutableEmptyBag<T>

    • Field Detail

      • LAZY_ITERABLE

        private static final LazyIterable<?> LAZY_ITERABLE
      • TO_ARRAY

        private static final java.lang.Object[] TO_ARRAY
      • IMMUTABLE_EMPTY_PARTITION

        private static final PartitionImmutableBag<java.lang.Object> IMMUTABLE_EMPTY_PARTITION
    • Constructor Detail

      • ImmutableEmptyBag

        ImmutableEmptyBag()
    • Method Detail

      • equals

        public boolean equals​(java.lang.Object obj)
        Description copied from interface: Bag
        Two bags b1 and b2 are equal if m1.toMapOfItemToCount().equals(m2.toMapOfItemToCount()).
        Specified by:
        equals in interface Bag<T>
        Specified by:
        equals in interface java.util.Collection<T>
        Overrides:
        equals in class java.lang.Object
        See Also:
        Map.equals(Object)
      • sizeDistinct

        public int sizeDistinct()
        Description copied from interface: Bag
        The size of the Bag when counting only distinct elements.
        Specified by:
        sizeDistinct in interface Bag<T>
      • occurrencesOf

        public int occurrencesOf​(java.lang.Object item)
        Description copied from interface: Bag
        The occurrences of a distinct item in the bag.
        Specified by:
        occurrencesOf in interface Bag<T>
      • forEachWithOccurrences

        public void forEachWithOccurrences​(ObjectIntProcedure<? super T> objectIntProcedure)
        Description copied from interface: Bag
        For each distinct item, with the number of occurrences, execute the specified procedure.
        Specified by:
        forEachWithOccurrences in interface Bag<T>
      • anySatisfyWithOccurrences

        public boolean anySatisfyWithOccurrences​(ObjectIntPredicate<? super T> predicate)
        Description copied from interface: Bag
        Returns true if the predicate evaluates to true for any element of the Bag. Returns false if the Bag is empty or if no element returns true for the predicate.
        Specified by:
        anySatisfyWithOccurrences in interface Bag<T>
      • allSatisfyWithOccurrences

        public boolean allSatisfyWithOccurrences​(ObjectIntPredicate<? super T> predicate)
        Description copied from interface: Bag
        Returns true if the predicate evaluates to true for all elements of the Bag. Returns false if the Bag is empty or if not all elements return true for the predicate.
        Specified by:
        allSatisfyWithOccurrences in interface Bag<T>
      • noneSatisfyWithOccurrences

        public boolean noneSatisfyWithOccurrences​(ObjectIntPredicate<? super T> predicate)
        Description copied from interface: Bag
        Returns true if the Bag is empty or if the predicate evaluates to false for all elements of the Bag. Returns false if the predicate evaluates to true for at least one element of the Bag.
        Specified by:
        noneSatisfyWithOccurrences in interface Bag<T>
      • detectWithOccurrences

        public T detectWithOccurrences​(ObjectIntPredicate<? super T> predicate)
        Description copied from interface: Bag
        Returns an element of the Bag that satisfies the predicate or null if such an element does not exist
        Specified by:
        detectWithOccurrences in interface Bag<T>
      • collectWithOccurrences

        public <V,​R extends java.util.Collection<V>> R collectWithOccurrences​(ObjectIntToObjectFunction<? super T,​? extends V> function,
                                                                                    R target)
        Description copied from interface: Bag
        Iterates over the unique elements and their occurrences and collects the results of applying the specified function into the target collection.
        Specified by:
        collectWithOccurrences in interface Bag<T>
        Since:
        9.1.
      • hashCode

        public int hashCode()
        Description copied from interface: Bag
        Returns the hash code for this Bag, defined as this.Bag.toMapOfItemToCount().hashCode().
        Specified by:
        hashCode in interface Bag<T>
        Specified by:
        hashCode in interface java.util.Collection<T>
        Overrides:
        hashCode in class java.lang.Object
        See Also:
        Map.hashCode()
      • size

        public int size()
        Description copied from interface: RichIterable
        Returns the number of items in this iterable.
        Specified by:
        size in interface java.util.Collection<T>
        Specified by:
        size in interface RichIterable<T>
      • notEmpty

        public boolean notEmpty()
        Description copied from interface: RichIterable
        The English equivalent of !this.isEmpty()
        Specified by:
        notEmpty in interface RichIterable<T>
      • contains

        public boolean contains​(java.lang.Object object)
        Description copied from interface: RichIterable
        Returns true if the iterable has an element which responds true to element.equals(object).
        Specified by:
        contains in interface java.util.Collection<T>
        Specified by:
        contains in interface RichIterable<T>
        Overrides:
        contains in class AbstractRichIterable<T>
      • each

        public void each​(Procedure<? super T> procedure)
        Description copied from interface: RichIterable
        The procedure is executed for each element in the iterable.

        Example using a Java 8 lambda expression:

         people.each(person -> LOGGER.info(person.getName()));
         

        Example using an anonymous inner class:

         people.each(new Procedure<Person>()
         {
             public void value(Person person)
             {
                 LOGGER.info(person.getName());
             }
         });
         
        This method is a variant of InternalIterable.forEach(Procedure) that has a signature conflict with Iterable.forEach(java.util.function.Consumer).
        Specified by:
        each in interface RichIterable<T>
        See Also:
        InternalIterable.forEach(Procedure), Iterable.forEach(java.util.function.Consumer)
      • forEachWithIndex

        public void forEachWithIndex​(ObjectIntProcedure<? super T> objectIntProcedure)
        Description copied from interface: InternalIterable
        Iterates over the iterable passing each element and the current relative int index to the specified instance of ObjectIntProcedure.

        Example using a Java 8 lambda:

         people.forEachWithIndex((Person person, int index) -> LOGGER.info("Index: " + index + " person: " + person.getName()));
         

        Example using an anonymous inner class:

         people.forEachWithIndex(new ObjectIntProcedure<Person>()
         {
             public void value(Person person, int index)
             {
                 LOGGER.info("Index: " + index + " person: " + person.getName());
             }
         });
         
        Specified by:
        forEachWithIndex in interface InternalIterable<T>
        Overrides:
        forEachWithIndex in class AbstractRichIterable<T>
      • forEachWith

        public <P> void forEachWith​(Procedure2<? super T,​? super P> procedure,
                                    P parameter)
        Description copied from interface: InternalIterable
        The procedure2 is evaluated for each element in the iterable with the specified parameter provided as the second argument.

        Example using a Java 8 lambda:

         people.forEachWith((Person person, Person other) ->
             {
                 if (person.isRelatedTo(other))
                 {
                      LOGGER.info(person.getName());
                 }
             }, fred);
         

        Example using an anonymous inner class:

         people.forEachWith(new Procedure2<Person, Person>()
         {
             public void value(Person person, Person other)
             {
                 if (person.isRelatedTo(other))
                 {
                      LOGGER.info(person.getName());
                 }
             }
         }, fred);
         
        Specified by:
        forEachWith in interface InternalIterable<T>
        Overrides:
        forEachWith in class AbstractRichIterable<T>
      • getFirst

        public T getFirst()
        Description copied from interface: RichIterable
        Returns the first element of an iterable. In the case of a List it is the element at the first index. In the case of any other Collection, it is the first element that would be returned during an iteration. If the iterable is empty, null is returned. If null is a valid element of the container, then a developer would need to check to see if the iterable is empty to validate that a null result was not due to the container being empty.

        The order of Sets are not guaranteed (except for TreeSets and other Ordered Set implementations), so if you use this method, the first element could be any element from the Set.

        Specified by:
        getFirst in interface RichIterable<T>
      • getLast

        public T getLast()
        Description copied from interface: RichIterable
        Returns the last element of an iterable. In the case of a List it is the element at the last index. In the case of any other Collection, it is the last element that would be returned during an iteration. If the iterable is empty, null is returned. If null is a valid element of the container, then a developer would need to check to see if the iterable is empty to validate that a null result was not due to the container being empty.

        The order of Sets are not guaranteed (except for TreeSets and other Ordered Set implementations), so if you use this method, the last element could be any element from the Set.

        Specified by:
        getLast in interface RichIterable<T>
      • getOnly

        public T getOnly()
        Description copied from interface: RichIterable
        Returns the element if the iterable has exactly one element. Otherwise, throw IllegalStateException.
        Specified by:
        getOnly in interface RichIterable<T>
        Returns:
        an element of an iterable.
      • iterator

        public java.util.Iterator<T> iterator()
        Specified by:
        iterator in interface java.util.Collection<T>
        Specified by:
        iterator in interface java.lang.Iterable<T>
      • newWithAll

        public ImmutableBag<T> newWithAll​(java.lang.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 ImmutableBag<T>
        Specified by:
        newWithAll in interface ImmutableCollection<T>
      • select

        public 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"));
         

        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 ImmutableBag<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>
      • reject

        public 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"));
         

        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 ImmutableBag<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
      • partition

        public 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"));
         

        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 ImmutableBag<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>
        Overrides:
        partition in class AbstractImmutableBag<T>
      • partitionWith

        public <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");
         

        Example using an anonymous inner class:

         PartitionIterable<Person> newYorkersAndNonNewYorkers =
             people.partitionWith(new Predicate2<Person, String>()
             {
                 public boolean accept(Person person, String state)
                 {
                     return person.getAddress().getState().getName().equals(state);
                 }
             }, "New York");
         
        Specified by:
        partitionWith in interface Bag<T>
        Specified by:
        partitionWith in interface ImmutableBag<T>
        Specified by:
        partitionWith in interface ImmutableBagIterable<T>
        Specified by:
        partitionWith in interface ImmutableCollection<T>
        Specified by:
        partitionWith in interface RichIterable<T>
        Overrides:
        partitionWith in class AbstractImmutableBag<T>
      • collect

        public <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());
         

        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 ImmutableBag<T>
        Specified by:
        collect in interface ImmutableCollection<T>
        Specified by:
        collect in interface RichIterable<T>
        Specified by:
        collect in interface UnsortedBag<T>
      • collectBoolean

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectBoolean in interface ImmutableCollection<T>
        Specified by:
        collectBoolean in interface RichIterable<T>
        Specified by:
        collectBoolean in interface UnsortedBag<T>
        Overrides:
        collectBoolean in class AbstractImmutableBag<T>
      • collectByte

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectByte in interface ImmutableCollection<T>
        Specified by:
        collectByte in interface RichIterable<T>
        Specified by:
        collectByte in interface UnsortedBag<T>
        Overrides:
        collectByte in class AbstractImmutableBag<T>
      • collectChar

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectChar in interface ImmutableCollection<T>
        Specified by:
        collectChar in interface RichIterable<T>
        Specified by:
        collectChar in interface UnsortedBag<T>
        Overrides:
        collectChar in class AbstractImmutableBag<T>
      • collectDouble

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectDouble in interface ImmutableCollection<T>
        Specified by:
        collectDouble in interface RichIterable<T>
        Specified by:
        collectDouble in interface UnsortedBag<T>
        Overrides:
        collectDouble in class AbstractImmutableBag<T>
      • collectFloat

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectFloat in interface ImmutableCollection<T>
        Specified by:
        collectFloat in interface RichIterable<T>
        Specified by:
        collectFloat in interface UnsortedBag<T>
        Overrides:
        collectFloat in class AbstractImmutableBag<T>
      • collectInt

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectInt in interface ImmutableCollection<T>
        Specified by:
        collectInt in interface RichIterable<T>
        Specified by:
        collectInt in interface UnsortedBag<T>
        Overrides:
        collectInt in class AbstractImmutableBag<T>
      • collectLong

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectLong in interface ImmutableCollection<T>
        Specified by:
        collectLong in interface RichIterable<T>
        Specified by:
        collectLong in interface UnsortedBag<T>
        Overrides:
        collectLong in class AbstractImmutableBag<T>
      • collectShort

        public 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());
         

        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 ImmutableBag<T>
        Specified by:
        collectShort in interface ImmutableCollection<T>
        Specified by:
        collectShort in interface RichIterable<T>
        Specified by:
        collectShort in interface UnsortedBag<T>
        Overrides:
        collectShort in class AbstractImmutableBag<T>
      • collectWith

        public <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));
         

        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 ImmutableBag<T>
        Specified by:
        collectWith in interface ImmutableCollection<T>
        Specified by:
        collectWith in interface RichIterable<T>
        Specified by:
        collectWith in interface UnsortedBag<T>
        Overrides:
        collectWith in class AbstractImmutableBag<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

        public <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 ImmutableBag<T>
        Specified by:
        collectIf in interface ImmutableCollection<T>
        Specified by:
        collectIf in interface RichIterable<T>
        Specified by:
        collectIf in interface UnsortedBag<T>
      • flatCollect

        public <V> ImmutableBag<V> flatCollect​(Function<? super T,​? extends java.lang.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 ImmutableBag<T>
        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
      • countBy

        public <V,​R extends MutableBagIterable<V>> R countBy​(Function<? super T,​? extends V> function,
                                                                   R target)
        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 RichIterable<T>
        Since:
        9.0
      • countByWith

        public <V,​P,​R extends MutableBagIterable<V>> R countByWith​(Function2<? super T,​? super P,​? extends V> function,
                                                                               P parameter,
                                                                               R target)
        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 RichIterable<T>
        Since:
        9.0
      • countByEach

        public <V,​R extends MutableBagIterable<V>> R countByEach​(Function<? super T,​? extends java.lang.Iterable<V>> function,
                                                                       R target)
        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 RichIterable<T>
        Since:
        10.0.0
      • groupBy

        public <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);
         

        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 ImmutableBag<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>
      • detect

        public T detect​(Predicate<? super T> predicate)
        Description copied from interface: RichIterable
        Returns the first element of the iterable for which the predicate evaluates to true or null in the case where no element returns true. This method is commonly called find.

        Example using a Java 8 lambda expression:

         Person person =
             people.detect(person -> person.getFirstName().equals("John") && person.getLastName().equals("Smith"));
         

        Example using an anonymous inner class:

         Person person =
             people.detect(new Predicate<Person>()
             {
                 public boolean accept(Person person)
                 {
                     return person.getFirstName().equals("John") && person.getLastName().equals("Smith");
                 }
             });
         
        Specified by:
        detect in interface RichIterable<T>
        Overrides:
        detect in class AbstractRichIterable<T>
      • detectWith

        public <P> T detectWith​(Predicate2<? super T,​? super P> predicate,
                                P parameter)
        Description copied from interface: RichIterable
        Returns the first element that evaluates to true for the specified predicate2 and parameter, or null if none evaluate to true.

        Example using a Java 8 lambda expression:

         Person person =
             people.detectWith((person, fullName) -> person.getFullName().equals(fullName), "John Smith");
         

        Example using an anonymous inner class:

         Person person =
             people.detectWith(new Predicate2<Person, String>()
             {
                 public boolean accept(Person person, String fullName)
                 {
                     return person.getFullName().equals(fullName);
                 }
             }, "John Smith");
         
        Specified by:
        detectWith in interface RichIterable<T>
        Overrides:
        detectWith in class AbstractRichIterable<T>
      • detectOptional

        public java.util.Optional<T> detectOptional​(Predicate<? super T> predicate)
        Description copied from interface: RichIterable
        Returns the first element of the iterable for which the predicate evaluates to true as an Optional. This method is commonly called find.

        Example using a Java 8 lambda expression:

         Person person =
             people.detectOptional(person -> person.getFirstName().equals("John") && person.getLastName().equals("Smith"));
         

        Specified by:
        detectOptional in interface RichIterable<T>
        Overrides:
        detectOptional in class AbstractRichIterable<T>
      • detectWithOptional

        public <P> java.util.Optional<T> detectWithOptional​(Predicate2<? super T,​? super P> predicate,
                                                            P parameter)
        Description copied from interface: RichIterable
        Returns the first element that evaluates to true for the specified predicate2 and parameter as an Optional.

        Example using a Java 8 lambda expression:

         Optional<Person> person =
             people.detectWithOptional((person, fullName) -> person.getFullName().equals(fullName), "John Smith");
         

        Specified by:
        detectWithOptional in interface RichIterable<T>
        Overrides:
        detectWithOptional in class AbstractRichIterable<T>
      • detectIfNone

        public T detectIfNone​(Predicate<? super T> predicate,
                              Function0<? extends T> function)
        Description copied from interface: RichIterable
        Returns the first element of the iterable for which the predicate evaluates to true. If no element matches the predicate, then returns the value of applying the specified function.
        Specified by:
        detectIfNone in interface RichIterable<T>
      • count

        public int count​(Predicate<? super T> predicate)
        Description copied from interface: RichIterable
        Return the total number of elements that answer true to the specified predicate.

        Example using a Java 8 lambda expression:

         int count =
             people.count(person -> person.getAddress().getState().getName().equals("New York"));
         

        Example using an anonymous inner class:

         int count =
             people.count(new Predicate<Person>()
             {
                 public boolean accept(Person person)
                 {
                     return person.getAddress().getState().getName().equals("New York");
                 }
             });
         
        Specified by:
        count in interface RichIterable<T>
        Overrides:
        count in class AbstractBag<T>
      • countWith

        public <P> int countWith​(Predicate2<? super T,​? super P> predicate,
                                 P parameter)
        Description copied from interface: RichIterable
        Returns the total number of elements that evaluate to true for the specified predicate.
        e.g.
         return lastNames.countWith(Predicates2.equal(), "Smith");
         
        Specified by:
        countWith in interface RichIterable<T>
        Overrides:
        countWith in class AbstractRichIterable<T>
      • anySatisfy

        public boolean anySatisfy​(Predicate<? super T> predicate)
        Description copied from interface: RichIterable
        Returns true if the predicate evaluates to true for any element of the iterable. Returns false if the iterable is empty, or if no element returned true when evaluating the predicate.
        Specified by:
        anySatisfy in interface RichIterable<T>
        Overrides:
        anySatisfy in class AbstractRichIterable<T>
      • anySatisfyWith

        public <P> boolean anySatisfyWith​(Predicate2<? super T,​? super P> predicate,
                                          P parameter)
        Description copied from interface: RichIterable
        Returns true if the predicate evaluates to true for any element of the collection, or return false. Returns false if the collection is empty.
        Specified by:
        anySatisfyWith in interface RichIterable<T>
        Overrides:
        anySatisfyWith in class AbstractRichIterable<T>
      • noneSatisfyWith

        public <P> boolean noneSatisfyWith​(Predicate2<? super T,​? super P> predicate,
                                           P parameter)
        Description copied from interface: RichIterable
        Returns true if the predicate evaluates to false for every element of the collection, or return false. Returns true if the collection is empty.
        Specified by:
        noneSatisfyWith in interface RichIterable<T>
        Overrides:
        noneSatisfyWith in class AbstractRichIterable<T>
      • injectInto

        public <IV> IV injectInto​(IV injectedValue,
                                  Function2<? super IV,​? super T,​? extends IV> function)
        Description copied from interface: RichIterable
        Returns the final result of evaluating function using each element of the iterable and the previous evaluation result as the parameters. The injected value is used for the first parameter of the first evaluation, and the current item in the iterable is used as the second parameter. This method is commonly called fold or sometimes reduce.
        Specified by:
        injectInto in interface RichIterable<T>
        Overrides:
        injectInto in class AbstractBag<T>
      • toSortedList

        public MutableList<T> toSortedList()
        Description copied from interface: RichIterable
        Converts the collection to a MutableList implementation and sorts it using the natural order of the elements.
        Specified by:
        toSortedList in interface RichIterable<T>
      • toSortedMap

        public <NK,​NV> MutableSortedMap<NK,​NV> toSortedMap​(java.util.Comparator<? super NK> comparator,
                                                                       Function<? super T,​? extends NK> keyFunction,
                                                                       Function<? super T,​? extends NV> valueFunction)
        Description copied from interface: RichIterable
        Converts the collection to a MutableSortedMap implementation using the specified key and value functions sorted by the given comparator.
        Specified by:
        toSortedMap in interface RichIterable<T>
        Overrides:
        toSortedMap in class AbstractRichIterable<T>
      • toArray

        public java.lang.Object[] toArray()
        Description copied from interface: RichIterable
        Converts this iterable to an array.
        Specified by:
        toArray in interface java.util.Collection<T>
        Specified by:
        toArray in interface RichIterable<T>
        Overrides:
        toArray in class AbstractRichIterable<T>
        See Also:
        Collection.toArray()
      • toArray

        public <T> T[] toArray​(T[] a)
        Description copied from interface: RichIterable
        Converts this iterable to an array using the specified target array, assuming the target array is as long or longer than the iterable.
        Specified by:
        toArray in interface java.util.Collection<T>
        Specified by:
        toArray in interface RichIterable<T>
        Overrides:
        toArray in class AbstractRichIterable<T>
        See Also:
        Collection.toArray(Object[])
      • min

        public T min​(java.util.Comparator<? super T> comparator)
        Description copied from interface: RichIterable
        Returns the minimum element out of this container based on the comparator.
        Specified by:
        min in interface RichIterable<T>
        Overrides:
        min in class AbstractRichIterable<T>
      • max

        public T max​(java.util.Comparator<? super T> comparator)
        Description copied from interface: RichIterable
        Returns the maximum element out of this container based on the comparator.
        Specified by:
        max in interface RichIterable<T>
        Overrides:
        max in class AbstractRichIterable<T>
      • minBy

        public <V extends java.lang.Comparable<? super V>> T minBy​(Function<? super T,​? extends V> function)
        Description copied from interface: RichIterable
        Returns the minimum elements out of this container based on the natural order of the attribute returned by Function.
        Specified by:
        minBy in interface RichIterable<T>
        Overrides:
        minBy in class AbstractRichIterable<T>
      • maxBy

        public <V extends java.lang.Comparable<? super V>> T maxBy​(Function<? super T,​? extends V> function)
        Description copied from interface: RichIterable
        Returns the maximum elements out of this container based on the natural order of the attribute returned by Function.
        Specified by:
        maxBy in interface RichIterable<T>
        Overrides:
        maxBy in class AbstractRichIterable<T>
      • toString

        public java.lang.String toString()
        Description copied from class: AbstractRichIterable
        Returns a string with the elements of the iterable separated by commas with spaces and enclosed in square brackets.
         Assert.assertEquals("[]", Lists.mutable.empty().toString());
         Assert.assertEquals("[1]", Lists.mutable.with(1).toString());
         Assert.assertEquals("[1, 2, 3]", Lists.mutable.with(1, 2, 3).toString());
         
        Specified by:
        toString in interface RichIterable<T>
        Overrides:
        toString in class AbstractRichIterable<T>
        Returns:
        a string representation of this collection.
        See Also:
        AbstractCollection.toString()
      • makeString

        public java.lang.String makeString()
        Description copied from interface: RichIterable
        Returns a string representation of this collection by delegating to RichIterable.makeString(String) and defaulting the separator parameter to the characters ", " (comma and space).
        Specified by:
        makeString in interface RichIterable<T>
        Returns:
        a string representation of this collection.
      • makeString

        public java.lang.String makeString​(java.lang.String separator)
        Description copied from interface: RichIterable
        Returns a string representation of this collection by delegating to RichIterable.makeString(String, String, String) and defaulting the start and end parameters to "" (the empty String).
        Specified by:
        makeString in interface RichIterable<T>
        Returns:
        a string representation of this collection.
      • makeString

        public java.lang.String makeString​(java.lang.String start,
                                           java.lang.String separator,
                                           java.lang.String end)
        Description copied from interface: RichIterable
        Returns a string representation of this collection with the elements separated by the specified separator and enclosed between the start and end strings.
        Specified by:
        makeString in interface RichIterable<T>
        Returns:
        a string representation of this collection.
      • appendString

        public void appendString​(java.lang.Appendable appendable)
        Description copied from interface: RichIterable
        Prints a string representation of this collection onto the given Appendable. Prints the string returned by RichIterable.makeString().
        Specified by:
        appendString in interface RichIterable<T>
      • zip

        @Deprecated
        public <S> ImmutableBag<Pair<T,​S>> zip​(java.lang.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 ImmutableBag<T>
        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.
      • chunk

        public RichIterable<RichIterable<T>> chunk​(int size)
        Description copied from interface: RichIterable
        Partitions elements in fixed size chunks.
        Specified by:
        chunk in interface RichIterable<T>
        Overrides:
        chunk in class AbstractImmutableBag<T>
        Parameters:
        size - the number of elements per chunk
        Returns:
        A RichIterable containing RichIterables of size size, except the last will be truncated if the elements don't divide evenly.
      • writeReplace

        private java.lang.Object writeReplace()
      • distinctView

        public RichIterable<T> distinctView()
        Description copied from interface: Bag
        Returns an unmodifiable view on the distinct elements with the same complexity as the Bag implementation.
        Specified by:
        distinctView in interface Bag<T>
        Returns:
        an unmodifiable view on the distinct elements of the Bag.