graphql.collect

Class ImmutableKit

java.lang.Object

graphql.collect.ImmutableKit

public final class ImmutableKit
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ImmutableKit()

Method Summary

Modifier and Type	Method and Description
static <T> com.google.common.collect.ImmutableList<T>	addToList(java.util.Collection<? extends T> existing, T newValue, T... extraValues) This constructs a new Immutable list from an existing collection and adds a new element to it.
static <K,V> com.google.common.collect.ImmutableMap<K,V>	addToMap(java.util.Map<K,V> existing, K newKey, V newVal)
static <T> com.google.common.collect.ImmutableSet<T>	addToSet(java.util.Collection<? extends T> existing, T newValue, T... extraValues) This constructs a new Immutable set from an existing collection and adds a new element to it.
static <T> com.google.common.collect.ImmutableList<T>	concatLists(java.util.List<T> l1, java.util.List<T> l2)
static <T> com.google.common.collect.ImmutableList<T>	emptyList()
static <K,V> com.google.common.collect.ImmutableMap<K,V>	emptyMap()
static <T,R> com.google.common.collect.ImmutableList<R>	map(java.util.Collection<? extends T> collection, java.util.function.Function<? super T,? extends R> mapper) This is more efficient than `c.stream().map().collect()` because it does not create the intermediate objects needed for the flexible style.
static <T,R> com.google.common.collect.ImmutableList<R>	mapAndDropNulls(java.util.Collection<? extends T> collection, java.util.function.Function<? super T,? extends R> mapper) This will map a collection of items but drop any that are null from the input.
static <T> com.google.common.collect.ImmutableList<T>	nonNullCopyOf(java.util.Collection<T> collection)

Methods inherited from class java.lang.Object

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

Constructor Detail

ImmutableKit

public ImmutableKit()

Method Detail

emptyList

public static <T> com.google.common.collect.ImmutableList<T> emptyList()

nonNullCopyOf

public static <T> com.google.common.collect.ImmutableList<T> nonNullCopyOf(java.util.Collection<T> collection)

emptyMap

public static <K,V> com.google.common.collect.ImmutableMap<K,V> emptyMap()

addToMap

public static <K,V> com.google.common.collect.ImmutableMap<K,V> addToMap(java.util.Map<K,V> existing,
                                                                         K newKey,
                                                                         V newVal)

concatLists

public static <T> com.google.common.collect.ImmutableList<T> concatLists(java.util.List<T> l1,
                                                                         java.util.List<T> l2)

map

public static <T,R> com.google.common.collect.ImmutableList<R> map(java.util.Collection<? extends T> collection,
                                                                   java.util.function.Function<? super T,? extends R> mapper)

This is more efficient than `c.stream().map().collect()` because it does not create the intermediate objects needed for the flexible style. Benchmarking has shown this to outperform `stream()`.

Type Parameters:

T - for two

R - for result

Parameters:

collection - the collection to map

mapper - the mapper function

Returns:

a map immutable list of results

mapAndDropNulls

public static <T,R> com.google.common.collect.ImmutableList<R> mapAndDropNulls(java.util.Collection<? extends T> collection,
                                                                               java.util.function.Function<? super T,? extends R> mapper)

This will map a collection of items but drop any that are null from the input. This is more efficient than `c.stream().map().collect()` because it does not create the intermediate objects needed for the flexible style. Benchmarking has shown this to outperform `stream()`.

Type Parameters:

T - for two

R - for result

Parameters:

collection - the collection to map

mapper - the mapper function

Returns:

a map immutable list of results

addToList

@SafeVarargs
public static <T> com.google.common.collect.ImmutableList<T> addToList(java.util.Collection<? extends T> existing,
                                                                                    T newValue,
                                                                                    T... extraValues)

This constructs a new Immutable list from an existing collection and adds a new element to it.

Type Parameters:

T - for two

Parameters:

existing - the existing collection

newValue - the new value to add

extraValues - more values to add

Returns:

an Immutable list with the extra items.

addToSet

@SafeVarargs
public static <T> com.google.common.collect.ImmutableSet<T> addToSet(java.util.Collection<? extends T> existing,
                                                                                  T newValue,
                                                                                  T... extraValues)

This constructs a new Immutable set from an existing collection and adds a new element to it.

Type Parameters:

T - for two

Parameters:

existing - the existing collection

newValue - the new value to add

extraValues - more values to add

Returns:

an Immutable Set with the extra items.