polyglot.util

Class NilMap<K,V>

java.lang.Object

polyglot.util.NilMap<K,V>

All Implemented Interfaces:

java.util.Map<K,V>

public final class NilMap<K,V>
extends java.lang.Object
implements java.util.Map<K,V>

This class represents a constant map which never contains any elements.

Nested Class Summary

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

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
static NilMap<?,?>	EMPTY_MAP

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object val)
static <K,V> NilMap<K,V>	emptyMap()
java.util.Set<java.util.Map.Entry<K,V>>	entrySet()
boolean	equals(java.lang.Object o)
V	get(java.lang.Object k)
int	hashCode()
boolean	isEmpty()
java.util.Set<K>	keySet()
V	put(K o1, V o2)
void	putAll(java.util.Map<? extends K,? extends V> t)
V	remove(java.lang.Object o)
int	size()
java.util.Collection<V>	values()

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_MAP

public static final NilMap<?,?> EMPTY_MAP

Method Detail

emptyMap

public static final <K,V> NilMap<K,V> emptyMap()

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map<K,V>

containsValue

public boolean containsValue(java.lang.Object val)

Specified by:

containsValue in interface java.util.Map<K,V>

entrySet

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

Specified by:

entrySet in interface java.util.Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<K,V>

Overrides:

hashCode in class java.lang.Object

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,V>

keySet

public java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,V>

size

public int size()

Specified by:

size in interface java.util.Map<K,V>

values

public java.util.Collection<V> values()

Specified by:

values in interface java.util.Map<K,V>

get

public V get(java.lang.Object k)

Specified by:

get in interface java.util.Map<K,V>

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map<K,V>

Overrides:

equals in class java.lang.Object

clear

public void clear()

Specified by:

clear in interface java.util.Map<K,V>

putAll

public void putAll(java.util.Map<? extends K,? extends V> t)

Specified by:

putAll in interface java.util.Map<K,V>

remove

public V remove(java.lang.Object o)

Specified by:

remove in interface java.util.Map<K,V>

put

public V put(K o1,
    V o2)

Specified by:

put in interface java.util.Map<K,V>