Package org.eclipse.collections.impl.lazy

Class ReverseIterable<T>

java.lang.Object
org.eclipse.collections.impl.AbstractRichIterable<T>
org.eclipse.collections.impl.lazy.AbstractLazyIterable<T>
org.eclipse.collections.impl.lazy.ReverseIterable<T>
All Implemented Interfaces:
Iterable<T>, InternalIterable<T>, LazyIterable<T>, RichIterable<T>
public class ReverseIterable<T> extends AbstractLazyIterable<T>
A ReverseIterable is an iterable that wraps another iterable and iterates in reverse order.

  • Constructor Details

    • ReverseIterable

      public ReverseIterable(ListIterable<T> newAdapted)

  • Method Details

    • adapt

      public static <T> ReverseIterable<T> adapt(ListIterable<T> listIterable)

    • 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).
      See Also:

    • 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>

    • size

      public int size()
      Description copied from interface: RichIterable
      Returns the number of items in this iterable.
      Specified by:
      size in interface RichIterable<T>
      Overrides:
      size in class AbstractLazyIterable<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 LazyIterable<T>
      Specified by:
      getFirst in interface RichIterable<T>
      Overrides:
      getFirst in class AbstractLazyIterable<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>
      Overrides:
      getLast in class AbstractLazyIterable<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>
      Overrides:
      getOnly in class AbstractLazyIterable<T>
      Returns:
      an element of an iterable.

    • isEmpty

      public boolean isEmpty()
      Description copied from interface: RichIterable
      Returns true if this iterable has zero items.
      Specified by:
      isEmpty in interface RichIterable<T>
      Overrides:
      isEmpty in class AbstractLazyIterable<T>

    • iterator

      public Iterator<T> iterator()