Package com.tangosol.util

Class NullImplementation.NullMap

java.lang.Object

java.util.AbstractMap

com.tangosol.util.NullImplementation.NullMap

All Implemented Interfaces:

ExternalizableLite, PortableObject, Serializable, Map

Direct Known Subclasses:

NullImplementation.NullObservableMap

Enclosing class:

NullImplementation

public static class NullImplementation.NullMap
extends AbstractMap
implements Map, Serializable, ExternalizableLite, PortableObject

A Map that contains nothing and does nothing.

See Also:

• Serialized Form

Nested Class Summary

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>

Field Summary

Fields

Modifier and Type	Field	Description
static final Map	INSTANCE	Since the Map contains no information, only one ever has to exist.

Constructor Summary

Constructors

Constructor	Description
NullMap()	Default constructor (for ExternalizableLite and PortableObject).

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set	entrySet()
boolean	equals(Object o)
Object	get(Object key)
int	hashCode()
Set	keySet()
Object	put(Object key, Object value)
void	putAll(Map map)
void	readExternal(PofReader in)	Restore the contents of a user type instance by reading its state using the specified PofReader object.
void	readExternal(DataInput in)	Restore the contents of this object by loading the object's state from the passed DataInput object.
Object	remove(Object key)
int	size()
Collection	values()
void	writeExternal(PofWriter out)	Save the contents of a POF user type instance by writing its state using the specified PofWriter object.
void	writeExternal(DataOutput out)	Save the contents of this object by storing the object's state into the passed DataOutput object.

Methods inherited from class java.util.AbstractMap

clear, clone, isEmpty, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

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

Field Details

INSTANCE

public static final Map INSTANCE

Since the Map contains no information, only one ever has to exist.

Constructor Details

NullMap

public NullMap()

Default constructor (for ExternalizableLite and PortableObject).

Method Details

size

public int size()

Specified by:

size in interface Map

Overrides:

size in class AbstractMap

get

public Object get(Object key)

Specified by:

get in interface Map

Overrides:

get in class AbstractMap

put

public Object put(Object key,
 Object value)

Specified by:

put in interface Map

Overrides:

put in class AbstractMap

putAll

public void putAll(Map map)

Specified by:

putAll in interface Map

Overrides:

putAll in class AbstractMap

remove

public Object remove(Object key)

Specified by:

remove in interface Map

Overrides:

remove in class AbstractMap

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map

Overrides:

containsKey in class AbstractMap

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map

Overrides:

containsValue in class AbstractMap

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map

Specified by:

entrySet in class AbstractMap

keySet

public Set keySet()

Specified by:

keySet in interface Map

Overrides:

keySet in class AbstractMap

values

public Collection values()

Specified by:

values in interface Map

Overrides:

values in class AbstractMap

equals

public boolean equals(Object o)

Specified by:

equals in interface Map

Overrides:

equals in class AbstractMap

hashCode

public int hashCode()

Specified by:

hashCode in interface Map

Overrides:

hashCode in class AbstractMap

readExternal

public void readExternal(DataInput in)
                  throws IOException

Restore the contents of this object by loading the object's state from the passed DataInput object.

Specified by:

readExternal in interface ExternalizableLite

Parameters:

in - the DataInput stream to read data from in order to restore the state of this object

Throws:

IOException - if an I/O exception occurs

writeExternal

public void writeExternal(DataOutput out)
                   throws IOException

Save the contents of this object by storing the object's state into the passed DataOutput object.

Specified by:

writeExternal in interface ExternalizableLite

Parameters:

out - the DataOutput stream to write the state of this object to

Throws:

IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws IOException

Restore the contents of a user type instance by reading its state using the specified PofReader object.

Specified by:

readExternal in interface PortableObject

Parameters:

in - the PofReader from which to read the object's state

Throws:

IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws IOException

Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Specified by:

writeExternal in interface PortableObject

Parameters:

out - the PofWriter to which to write the object's state

Throws:

IOException - if an I/O error occurs