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 ImmutableSet instances. Example:

 static final ImmutableSet<Color> GOOGLE_COLORS =
     ImmutableSet.<Color>builder()
         .addAll(WEBSAFE_COLORS)
         .add(new Color(0, 191, 255))
         .build();
 

Elements appear in the resulting set in the same order they were first added to the builder.

Building does not change the state of the builder, so it is still possible to add more elements and to build again.

Since:

2.0

Constructor Summary

Constructors

Constructor	Description
Builder()	Creates a new builder.

Method Summary

Modifier and Type	Method	Description
ImmutableSet.Builder<E>	add(E element)	Adds element to the ImmutableSet.
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>	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 Details

Builder

public Builder()

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

Method Details

add

@CanIgnoreReturnValue
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

@CanIgnoreReturnValue
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

@CanIgnoreReturnValue
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

@CanIgnoreReturnValue
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>