com.facebook.buck.util

Class ImmutableMapWithNullValues<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

com.facebook.buck.util.ImmutableMapWithNullValues<K,V>

All Implemented Interfaces:

Map<K,V>

public final class ImmutableMapWithNullValues<K,V>
extends AbstractMap<K,V>

ImmutableMap uses 16 fewer bytes per entry than TreeMap, but does not allow null values. This wrapper class lets us have our cake and eat it too -- we use a sentinel object in the underlying ImmutableMap and translate it on any read path.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ImmutableMapWithNullValues.Builder<K,V>

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method and Description
Set<Map.Entry<K,V>>	entrySet()
boolean	equals(Object other)
V	get(Object key)
int	hashCode()
String	toString()
Collection<V>	values()

Methods inherited from class java.util.AbstractMap

clear, clone, containsKey, containsValue, isEmpty, keySet, put, putAll, remove, size

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Method Detail

get

@Nullable
public V get(@Nullable
                       Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

equals

public boolean equals(Object other)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class AbstractMap<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class AbstractMap<K,V>

toString

public String toString()

Overrides:

toString in class AbstractMap<K,V>