com.google.common.collect

Class ImmutableSet.Builder<E>

  • Direct Known Subclasses:
    ImmutableSortedSet.Builder
    Enclosing class:
    ImmutableSet < E> 

    public static class ImmutableSet.Builder<E>
extends ImmutableCollection.Builder<E>
    A builder for creating immutable set instances, especially public static final sets ("constant sets"). Example: 
        public static final ImmutableSet<Color> GOOGLE_COLORS = new ImmutableSet.Builder<Color>() .addAll(WEBSAFE_COLORS) .add(new Color(0, 191, 255)) .build();

    Builder instances can be reused; it is safe to call build() multiple times to build multiple sets in series. Each set is a superset of the set created before it.

    Since:
    2.0 (imported from Google Collections Library)

    • Constructor Detail

      • Builder

        public Builder()
        Creates a new builder. The returned builder is equivalent to the builder generated by ImmutableSet.builder().

    • Method Detail

      • add

        public ImmutableSet.Builder<E> add(E element)
        Adds element to the ImmutableSet. If the ImmutableSet already contains element, then add has no effect (only the previously added element is retained).
        Parameters:
        element - the element to add
        Returns:
        this Builder object
        Throws:
        NullPointerException - if element is null

      • add

        public ImmutableSet.Builder<E> add(E... elements)
        Adds each element of elements to the ImmutableSet, ignoring duplicate elements (only the first duplicate element is added).
        Parameters:
        elements - the elements to add
        Returns:
        this Builder object
        Throws:
        NullPointerException - if elements is null or contains a null element

      • addAll

        public ImmutableSet.Builder<E> addAll(Iterable<? extends E> elements)
        Adds each element of elements to the ImmutableSet, ignoring duplicate elements (only the first duplicate element is added).
        Parameters:
        elements - the Iterable to add to the ImmutableSet
        Returns:
        this Builder object
        Throws:
        NullPointerException - if elements is null or contains a null element

      • addAll

        public ImmutableSet.Builder<E> addAll(Iterator<? extends E> elements)
        Adds each element of elements to the ImmutableSet, ignoring duplicate elements (only the first duplicate element is added).
        Overrides:
        addAll in class  ImmutableCollection.Builder<E>
        Parameters:
        elements - the elements to add to the ImmutableSet
        Returns:
        this Builder object
        Throws:
        NullPointerException - if elements is null or contains a null element

      • build

        public ImmutableSet<E> build()
        Returns a newly-created ImmutableSet based on the contents of the Builder.