com.diffplug.common.collect

Class ImmutableMultiset.Builder<E>

java.lang.Object

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

com.diffplug.common.collect.ImmutableMultiset.Builder<E>

Direct Known Subclasses:

ImmutableSortedMultiset.Builder

Enclosing class:

ImmutableMultiset<E>

public static class ImmutableMultiset.Builder<E>
extends ImmutableCollection.Builder<E>

A builder for creating immutable multiset instances, especially public static final multisets (“constant multisets”). Example:

 

  public static final ImmutableMultiset<Bean> BEANS =
      new ImmutableMultiset.Builder<Bean>()
          .addCopies(Bean.COCOA, 4)
          .addCopies(Bean.GARDEN, 6)
          .addCopies(Bean.RED, 8)
          .addCopies(Bean.BLACK_EYED, 10)
          .build();

Builder instances can be reused; it is safe to call build() multiple times to build multiple multisets in series.

Since:

2.0

Constructor Summary

Constructors

Constructor and Description
Builder() Creates a new builder.

Method Summary

Modifier and Type	Method and Description
ImmutableMultiset.Builder<E>	add(E... elements) Adds each element of elements to the ImmutableMultiset.
ImmutableMultiset.Builder<E>	add(E element) Adds element to the ImmutableMultiset.
ImmutableMultiset.Builder<E>	addAll(Iterable<? extends E> elements) Adds each element of elements to the ImmutableMultiset.
ImmutableMultiset.Builder<E>	addAll(Iterator<? extends E> elements) Adds each element of elements to the ImmutableMultiset.
ImmutableMultiset.Builder<E>	addCopies(E element, int occurrences) Adds a number of occurrences of an element to this ImmutableMultiset.
ImmutableMultiset<E>	build() Returns a newly-created ImmutableMultiset based on the contents of the Builder.
ImmutableMultiset.Builder<E>	setCount(E element, int count) Adds or removes the necessary occurrences of an element such that the element attains the desired count.

Methods inherited from class java.lang.Object

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

Constructor Detail

Builder

public Builder()

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

Method Detail

add

public ImmutableMultiset.Builder<E> add(E element)

Adds element to the ImmutableMultiset.

Specified by:

add in class ImmutableCollection.Builder<E>

Parameters:

element - the element to add

Returns:

this Builder object

Throws:

NullPointerException - if element is null

addCopies

public ImmutableMultiset.Builder<E> addCopies(E element,
                                              int occurrences)

Adds a number of occurrences of an element to this ImmutableMultiset.

Parameters:

element - the element to add

occurrences - the number of occurrences of the element to add. May be zero, in which case no change will be made.

Returns:

this Builder object

Throws:

NullPointerException - if element is null

IllegalArgumentException - if occurrences is negative, or if this operation would result in more than Integer.MAX_VALUE occurrences of the element

setCount

public ImmutableMultiset.Builder<E> setCount(E element,
                                             int count)

Adds or removes the necessary occurrences of an element such that the element attains the desired count.

Parameters:

element - the element to add or remove occurrences of

count - the desired count of the element in this multiset

Returns:

this Builder object

Throws:

NullPointerException - if element is null

IllegalArgumentException - if count is negative

add

public ImmutableMultiset.Builder<E> add(E... elements)

Adds each element of elements to the ImmutableMultiset.

Overrides:

add in class ImmutableCollection.Builder<E>

Parameters:

elements - the elements to add

Returns:

this Builder object

Throws:

NullPointerException - if elements is null or contains a null element

addAll

public ImmutableMultiset.Builder<E> addAll(Iterable<? extends E> elements)

Adds each element of elements to the ImmutableMultiset.

Overrides:

addAll in class ImmutableCollection.Builder<E>

Parameters:

elements - the Iterable to add to the ImmutableMultiset

Returns:

this Builder object

Throws:

NullPointerException - if elements is null or contains a null element

addAll

public ImmutableMultiset.Builder<E> addAll(Iterator<? extends E> elements)

Adds each element of elements to the ImmutableMultiset.

Overrides:

addAll in class ImmutableCollection.Builder<E>

Parameters:

elements - the elements to add to the ImmutableMultiset

Returns:

this Builder object

Throws:

NullPointerException - if elements is null or contains a null element

build

public ImmutableMultiset<E> build()

Returns a newly-created ImmutableMultiset based on the contents of the Builder.

Specified by:

build in class ImmutableCollection.Builder<E>