com.google.common.collect

Class ImmutableSet.Builder<E>

java.lang.Object

com.google.common.collect.ImmutableCollection.Builder<E>

com.google.common.collect.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 Summary

Constructors

Constructor and Description
ImmutableSet.Builder() Creates a new builder.

Method Summary

Methods

Modifier and Type	Method and Description
ImmutableSet.Builder<E>	add(E... elements) Adds each element of elements to the ImmutableSet, ignoring duplicate elements (only the first duplicate element is added).
ImmutableSet.Builder<E>	add(E element) Adds element to the ImmutableSet.
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).
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).
ImmutableSet<E>	build() Returns a newly-created ImmutableSet based on the contents of the Builder.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ImmutableSet.Builder

public ImmutableSet.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.

Specified by:

build in class ImmutableCollection.Builder<E>