jltools.util
Class NilMap

java.lang.Object
  |
  +--jltools.util.NilMap

All Implemented Interfaces:

java.util.Map

public final class NilMap

extends java.lang.Object

implements java.util.Map

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

Inner classes inherited from class java.util.Map

java.util.Map.Entry

Field Summary

static NilMap

EMPTY_MAP

Method Summary

void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object val)
java.util.Set	entrySet()
boolean	equals(java.lang.Object o)
java.lang.Object	get(java.lang.Object k)
int	hashCode()
boolean	isEmpty()
java.util.Set	keySet()
java.lang.Object	put(java.lang.Object o1, java.lang.Object o2)
void	putAll(java.util.Map t)
java.lang.Object	remove(java.lang.Object o)
int	size()
java.util.Collection	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

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map

containsValue

public boolean containsValue(java.lang.Object val)

Specified by:

containsValue in interface java.util.Map

entrySet

public java.util.Set entrySet()

Specified by:

entrySet in interface java.util.Map

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map

Overrides:

hashCode in class java.lang.Object

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map

keySet

public java.util.Set keySet()

Specified by:

keySet in interface java.util.Map

size

public int size()

Specified by:

size in interface java.util.Map

values

public java.util.Collection values()

Specified by:

values in interface java.util.Map

get

public java.lang.Object get(java.lang.Object k)

Specified by:

get in interface java.util.Map

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map

Overrides:

equals in class java.lang.Object

clear

public void clear()

Specified by:

clear in interface java.util.Map

putAll

public void putAll(java.util.Map t)

Specified by:

putAll in interface java.util.Map

remove

public java.lang.Object remove(java.lang.Object o)

Specified by:

remove in interface java.util.Map

put

public java.lang.Object put(java.lang.Object o1,
                            java.lang.Object o2)

Specified by:

put in interface java.util.Map