org.jupnp.support.shared

Class AbstractMap<K,V>

java.lang.Object

org.jupnp.support.shared.AbstractMap<K,V>

All Implemented Interfaces:

Map<K,V>

public abstract class AbstractMap<K,V>
extends Object
implements Map<K,V>

A base class for Map implementations.

Subclasses that permit new mappings to be added must override put(K, V).

The default implementations of many methods are inefficient for large maps. For example in the default implementation, each call to get(java.lang.Object) performs a linear iteration of the entry set. Subclasses should override such methods to improve their performance.

Since:

1.2

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractMap.SimpleEntry<K,V> A key-value mapping with mutable values.
static class	AbstractMap.SimpleImmutableEntry<K,V> An immutable key-value mapping.

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

Map.Entry<K,V>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractMap()

Method Summary

Modifier and Type	Method and Description
void	clear() This implementation calls entrySet().clear().
protected Object	clone()
boolean	containsKey(Object key) This implementation iterates its key set, looking for a key that key equals.
boolean	containsValue(Object value) This implementation iterates its entry set, looking for an entry with a value that value equals.
abstract Set<Map.Entry<K,V>>	entrySet()
boolean	equals(Object object) This implementation first checks the structure of object.
V	get(Object key) This implementation iterates its entry set, looking for an entry with a key that key equals.
int	hashCode() This implementation iterates its entry set, summing the hashcodes of its entries.
boolean	isEmpty() This implementation compares size() to 0.
Set<K>	keySet() This implementation returns a view that calls through this to map.
V	put(K key, V value) This base implementation throws UnsupportedOperationException.
void	putAll(Map<? extends K,? extends V> map) This implementation iterates through map's entry set, calling put() for each.
V	remove(Object key) This implementation iterates its entry set, removing the entry with a key that key equals.
int	size() This implementation returns its entry set's size.
String	toString() This implementation composes a string by iterating its entry set.
Collection<V>	values() This implementation returns a view that calls through this to map.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractMap

protected AbstractMap()

Method Detail

clear

public void clear()

This implementation calls entrySet().clear().

Specified by:

clear in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

This implementation iterates its key set, looking for a key that key equals.

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

This implementation iterates its entry set, looking for an entry with a value that value equals.

Specified by:

containsValue in interface Map<K,V>

entrySet

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

Specified by:

entrySet in interface Map<K,V>

equals

public boolean equals(Object object)

This implementation first checks the structure of object. If it is not a map or of a different size, this returns false. Otherwise it iterates its own entry set, looking up each entry's key in object. If any value does not equal the other map's value for the same key, this returns false. Otherwise it returns true.

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

get

public V get(Object key)

This implementation iterates its entry set, looking for an entry with a key that key equals.

Specified by:

get in interface Map<K,V>

hashCode

public int hashCode()

This implementation iterates its entry set, summing the hashcodes of its entries.

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

isEmpty

public boolean isEmpty()

This implementation compares size() to 0.

Specified by:

isEmpty in interface Map<K,V>

keySet

public Set<K> keySet()

This implementation returns a view that calls through this to map. Its iterator transforms this map's entry set iterator to return keys.

Specified by:

keySet in interface Map<K,V>

put

public V put(K key,
             V value)

This base implementation throws UnsupportedOperationException.

Specified by:

put in interface Map<K,V>

putAll

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

This implementation iterates through map's entry set, calling put() for each.

Specified by:

putAll in interface Map<K,V>

remove

public V remove(Object key)

This implementation iterates its entry set, removing the entry with a key that key equals.

Specified by:

remove in interface Map<K,V>

size

public int size()

This implementation returns its entry set's size.

Specified by:

size in interface Map<K,V>

toString

public String toString()

This implementation composes a string by iterating its entry set. If this map contains itself as a key or a value, the string "(this Map)" will appear in its place.

Overrides:

toString in class Object

values

public Collection<V> values()

This implementation returns a view that calls through this to map. Its iterator transforms this map's entry set iterator to return values.

Specified by:

values in interface Map<K,V>

clone

protected Object clone()
                throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException