de.intarsys.tools.collection

Class PartitionedMap

java.lang.Object

de.intarsys.tools.collection.PartitionedMap

All Implemented Interfaces:

java.util.Map

public class PartitionedMap
extends java.lang.Object
implements java.util.Map

A map that wraps two other maps.

Nested Class Summary

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

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

Constructor Summary

Constructors

Constructor and Description
PartitionedMap()
PartitionedMap(java.util.Map parent, java.util.Map child)

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all mappings from this map (optional operation).
boolean	containsKey(java.lang.Object key) Returns true if this map contains a mapping for the specified key.
boolean	containsValue(java.lang.Object value) Returns true if this map maps one or more keys to the specified value.
static java.util.Map	create(java.util.Map parent, java.util.Map child)
java.util.Set	entrySet() Returns a set view of the mappings contained in this map.
java.lang.Object	get(java.lang.Object key) Returns the value to which this map maps the specified key.
protected java.util.Map	getChild()
java.util.Map	getParent()
boolean	isEmpty() Returns true if this map contains no key-value mappings.
java.util.Set	keySet() Returns a set view of the keys contained in this map.
java.lang.Object	put(java.lang.Object key, java.lang.Object value) Associates the specified value with the specified key in this map (optional operation).
void	putAll(java.util.Map t) Copies all of the mappings from the specified map to this map (optional operation).
java.lang.Object	remove(java.lang.Object key) Removes the mapping for this key from this map if present (optional operation).
void	setParent(java.util.Map newParent)
int	size() Returns the number of key-value mappings in this map.
java.lang.String	toString()
java.util.Collection	values() Returns a collection view of the values contained in this map.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

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

Constructor Detail

PartitionedMap

public PartitionedMap()

PartitionedMap

public PartitionedMap(java.util.Map parent,
                      java.util.Map child)

Method Detail

create

public static java.util.Map create(java.util.Map parent,
                                   java.util.Map child)

clear

public void clear()

Removes all mappings from this map (optional operation).

Specified by:

clear in interface java.util.Map

containsKey

public boolean containsKey(java.lang.Object key)

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface java.util.Map

Parameters:

key - key whose presence in this map is to be tested.

Returns:

true if this map contains a mapping for the specified key.

containsValue

public boolean containsValue(java.lang.Object value)

Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.

Specified by:

containsValue in interface java.util.Map

Parameters:

value - value whose presence in this map is to be tested.

Returns:

true if this map maps one or more keys to the specified value.

entrySet

public java.util.Set entrySet()

Returns a set view of the mappings contained in this map. Each element in the returned set is a Map.Entry. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:

entrySet in interface java.util.Map

Returns:

a set view of the mappings contained in this map.

get

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

Returns the value to which this map maps the specified key. Returns null if the map contains no mapping for this key. A return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

Specified by:

get in interface java.util.Map

Parameters:

key - key whose associated value is to be returned.

Returns:

the value to which this map maps the specified key, or null if the map contains no mapping for this key.

See Also:

containsKey(Object)

getChild

protected java.util.Map getChild()

getParent

public java.util.Map getParent()

isEmpty

public boolean isEmpty()

Returns true if this map contains no key-value mappings.

Specified by:

isEmpty in interface java.util.Map

Returns:

true if this map contains no key-value mappings.

keySet

public java.util.Set keySet()

Returns a set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAllretainAll, and clear operations. It does not support the add or addAll operations.

Specified by:

keySet in interface java.util.Map

Returns:

a set view of the keys contained in this map.

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for this key, the old value is replaced.

Specified by:

put in interface java.util.Map

Parameters:

key - key with which the specified value is to be associated.

value - value to be associated with the specified key.

Returns:

previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.

putAll

public void putAll(java.util.Map t)

Copies all of the mappings from the specified map to this map (optional operation). These mappings will replace any mappings that this map had for any of the keys currently in the specified map.

Specified by:

putAll in interface java.util.Map

Parameters:

t - Mappings to be stored in this map.

remove

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

Removes the mapping for this key from this map if present (optional operation).

Specified by:

remove in interface java.util.Map

Parameters:

key - key whose mapping is to be removed from the map.

Returns:

previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values.

setParent

public void setParent(java.util.Map newParent)

size

public int size()

Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

size in interface java.util.Map

Returns:

the number of key-value mappings in this map.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

values

public java.util.Collection values()

Returns a collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress, the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:

values in interface java.util.Map

Returns:

a collection view of the values contained in this map.