de.weltraumschaf.commons.uri

Class AbstractMultivaluedMap<K,V>

java.lang.Object

de.weltraumschaf.commons.uri.AbstractMultivaluedMap<K,V>

Type Parameters:

K - the type of keys maintained by this map.

V - the type of mapped values.

All Implemented Interfaces:

MultivaluedMap<K,V>, Map<K,List<V>>

Direct Known Subclasses:

MultivaluedHashMap

abstract class AbstractMultivaluedMap<K,V>
extends Object
implements MultivaluedMap<K,V>

Abstract skeleton implementation of a MultivaluedMap that is backed by a [key, multi-value] store represented as a Map Map<K, List<V>>.

Author:

Marek Potociar

Nested Class Summary

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<K,List<V>>	store Backing store for the [key, multi-value] pairs.

Constructor Summary

Constructors

Constructor and Description
AbstractMultivaluedMap(Map<K,List<V>> store) Initialize the backing store in the abstract parent multivalued map implementation.

Method Summary

Modifier and Type	Method and Description
void	add(K key, V value) Add a value to the current list of values for the supplied key.
void	addAll(K key, List<V> valueList) Add all the values from the supplied value list to the current list of values for the supplied key.
void	addAll(K key, V... newValues) Add multiple values to the current list of values for the supplied key.
void	addFirst(K key, V value) Add a value to the first position in the current list of values for the supplied key.
protected void	addFirstNull(List<V> values) Define the behavior for adding a null values to the first position in the value list.
protected void	addNull(List<V> values) Define the behavior for adding a null values to the value list.
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,List<V>>>	entrySet()
boolean	equals(Object o)
boolean	equalsIgnoreValueOrder(MultivaluedMap<K,V> omap) Compare the specified map with this map for equality modulo the order of values for each key.
List<V>	get(Object key)
V	getFirst(K key) A shortcut to get the first value of the supplied key.
protected List<V>	getValues(K key) Return a non-null list of values for a given key.
int	hashCode()
boolean	isEmpty()
Set<K>	keySet()
List<V>	put(K key, List<V> value)
void	putAll(Map<? extends K,? extends List<V>> m)
void	putSingle(K key, V value) Set the key's value to be a one item list consisting of the supplied value.
List<V>	remove(Object key)
int	size()
String	toString()
Collection<List<V>>	values()

Methods inherited from class java.lang.Object

clone, 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

Field Detail

store

protected final Map<K,List<V>> store

Backing store for the [key, multi-value] pairs.

Constructor Detail

AbstractMultivaluedMap

AbstractMultivaluedMap(Map<K,List<V>> store)

Initialize the backing store in the abstract parent multivalued map implementation.

Parameters:

store - the backing Map to be used as a [key, multi-value] store. Must not be null.

Throws:

NullPointerException - in case the underlying store parameter is null.

Method Detail

putSingle

public final void putSingle(K key,
                            V value)

Set the key's value to be a one item list consisting of the supplied value. Any existing values will be replaced. Set the value for the key to be a one item list consisting of the supplied value.

Any existing values will bereplaced.

NOTE: This implementation ignores null values; A supplied value of null is ignored and not added to the purged value list. As a result of such operation, empty value list would be registered for the supplied key. Overriding implementations may modify this behavior by redefining the #addNull(java.util.List) method.

Specified by:

putSingle in interface MultivaluedMap<K,V>

Parameters:

key - the key

value - the single value of the key

addNull

protected void addNull(List<V> values)

Define the behavior for adding a null values to the value list.

Default implementation is a no-op, i.e. the null values are ignored. Overriding implementations may modify this behavior by providing their own definitions of this method.

Parameters:

values - value list where the null value addition is being requested.

addFirstNull

protected void addFirstNull(List<V> values)

Define the behavior for adding a null values to the first position in the value list.

Default implementation is a no-op, i.e. the null values are ignored. Overriding implementations may modify this behavior by providing their own definitions of this method.

Parameters:

values - value list where the null value addition is being requested.

add

public final void add(K key,
                      V value)

Add a value to the current list of values for the supplied key. Add a value to the current list of values for the supplied key.

NOTE: This implementation ignores null values; A supplied value of null is ignored and not added to the value list. Overriding implementations may modify this behavior by redefining the #addNull(java.util.List) method.

Specified by:

add in interface MultivaluedMap<K,V>

Parameters:

key - the key

value - the value to be added.

addAll

@SafeVarargs
public final void addAll(K key,
                                      V... newValues)

Add multiple values to the current list of values for the supplied key. If the supplied array of new values is empty, method returns immediately. Method throws a NullPointerException if the supplied array of values is null. Add multiple values to the current list of values for the supplied key.

If the supplied array of new values is empty, method returns immediately. Method throws a NullPointerException if the supplied array of values is null.

NOTE: This implementation ignores null values; Any of the supplied values of null is ignored and not added to the value list. Overriding implementations may modify this behavior by redefining the #addNull(java.util.List) method.

Specified by:

addAll in interface MultivaluedMap<K,V>

Parameters:

key - the key.

newValues - the values to be added.

addAll

public final void addAll(K key,
                         List<V> valueList)

Add all the values from the supplied value list to the current list of values for the supplied key. If the supplied value list is empty, method returns immediately. Method throws a NullPointerException if the supplied array of values is null. Add all the values from the supplied value list to the current list of values for the supplied key.

If the supplied value list is empty, method returns immediately. Method throws a NullPointerException if the supplied array of values is null.

NOTE: This implementation ignores null values; Any null value in the supplied value list is ignored and not added to the value list. Overriding implementations may modify this behavior by redefining the #addNull(java.util.List) method.

Specified by:

addAll in interface MultivaluedMap<K,V>

Parameters:

key - the key.

valueList - the list of values to be added.

getFirst

public final V getFirst(K key)

A shortcut to get the first value of the supplied key.

Specified by:

getFirst in interface MultivaluedMap<K,V>

Parameters:

key - the key

Returns:

the first value for the specified key or null if the key is not in the map.

addFirst

public final void addFirst(K key,
                           V value)

Add a value to the first position in the current list of values for the supplied key. Add a value to the first position in the current list of values for the supplied key.

NOTE: This implementation ignores null values; A supplied value of null is ignored and not added to the purged value list. Overriding implementations may modify this behavior by redefining the #addFirstNull(java.util.List) method.

Specified by:

addFirst in interface MultivaluedMap<K,V>

Parameters:

key - the key

value - the value to be added.

getValues

protected final List<V> getValues(K key)

Return a non-null list of values for a given key. The returned list may be empty.

If there is no entry for the key in the map, a new empty java.util.List instance is created, registered within the map to hold the values of the key and returned from the method.

Parameters:

key - the key.

Returns:

value list registered with the key. The method is guaranteed to never return null.

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

This implementation delegates the method call to to the the underlying [key, multi-value] store.

Specified by:

hashCode in interface Map<K,List<V>>

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

This implementation delegates the method call to to the the underlying [key, multi-value] store.

Specified by:

equals in interface Map<K,List<V>>

Overrides:

equals in class Object

values

public Collection<List<V>> values()

Specified by:

values in interface Map<K,List<V>>

size

public int size()

Specified by:

size in interface Map<K,List<V>>

remove

public List<V> remove(Object key)

Specified by:

remove in interface Map<K,List<V>>

putAll

public void putAll(Map<? extends K,? extends List<V>> m)

Specified by:

putAll in interface Map<K,List<V>>

put

public List<V> put(K key,
                   List<V> value)

Specified by:

put in interface Map<K,List<V>>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,List<V>>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,List<V>>

get

public List<V> get(Object key)

Specified by:

get in interface Map<K,List<V>>

entrySet

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

Specified by:

entrySet in interface Map<K,List<V>>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,List<V>>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,List<V>>

clear

public void clear()

Specified by:

clear in interface Map<K,List<V>>

equalsIgnoreValueOrder

public boolean equalsIgnoreValueOrder(MultivaluedMap<K,V> omap)

Compare the specified map with this map for equality modulo the order of values for each key. Specifically, the values associated with each key are compared as if they were ordered lists.

Specified by:

equalsIgnoreValueOrder in interface MultivaluedMap<K,V>

Parameters:

omap - map to be compared to this one.

Returns:

true if the maps are equal modulo value ordering.