net.pwall.util

Class MiniMap2<K,V>

java.lang.Object

net.pwall.util.MiniMap<K,V>

net.pwall.util.MiniMap2<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Map<K,V>

public class MiniMap2<K,V>
extends MiniMap<K,V>

An implementation of MiniMap containing two entries.

Author:

Peter Wall

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
MiniMap2(K key0, V value0, K key1, V value1) Construct a MiniMap2 with the given keys and values.
MiniMap2(Map<K,V> map) Construct a MiniMap2 from another Map (helps with deserializing).

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(Object key) Test whether the map contains a key equal to the specified key (which may be null).
boolean	containsValue(Object value) Test whether the map contains a value equal to the specified value (which may be null).
Set<Map.Entry<K,V>>	entrySet() Get a Set of the entries in this map.
boolean	equals(Object other) Compares the specified object with this map for equality.
V	get(Object key) Get the value corresponding to the supplied key.
int	hashCode() Returns the hash code value for this map.
boolean	isEmpty() Return false to indicate that the map is not empty.
Set<K>	keySet() Get a Set of the keys in use in this map.
int	size() Get the number of entries (always two).
String	toString() Returns a string representation of this map.
Collection<V>	values() Get a Collection of the values in this map.

Methods inherited from class net.pwall.util.MiniMap

clear, entry, map, map, map, of, of, of, of, of, put, putAll, remove, stringOf

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

Constructor Detail

MiniMap2

public MiniMap2(K key0,
                V value0,
                K key1,
                V value1)

Construct a MiniMap2 with the given keys and values.

Parameters:

key0 - the first key

value0 - the first value

key1 - the second key

value1 - the second value

MiniMap2

public MiniMap2(Map<K,V> map)

Construct a MiniMap2 from another Map (helps with deserializing).

Parameters:

map - the other Map

Throws:

IllegalArgumentException - if the size of the other map is not 2

Method Detail

size

public int size()

Get the number of entries (always two).

Returns:

the number of entries

isEmpty

public boolean isEmpty()

Return false to indicate that the map is not empty.

Returns:

false

containsKey

public boolean containsKey(Object key)

Test whether the map contains a key equal to the specified key (which may be null).

Parameters:

key - the key

Returns:

true if the map contains the key

containsValue

public boolean containsValue(Object value)

Test whether the map contains a value equal to the specified value (which may be null).

Parameters:

value - the value

Returns:

true if the map contains the value

get

public V get(Object key)

Get the value corresponding to the supplied key. If the key is not found, null is returned.

Parameters:

key - the key

Returns:

the value

keySet

public Set<K> keySet()

Get a Set of the keys in use in this map. Returns a Set containing the two keys.

Returns:

the Set

values

public Collection<V> values()

Get a Collection of the values in this map. Returns a Collection containing the two values.

Returns:

the Collection

entrySet

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

Get a Set of the entries in this map. Returns a Set containing the two entries.

Returns:

the Set

equals

public boolean equals(Object other)

Compares the specified object with this map for equality. Returns true if the given object is also a map containing a single entry identical to that of this map.

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class MiniMap<K,V>

Parameters:

other - object to be compared for equality with this map

Returns:

true if the specified object is equal to this map

hashCode

public int hashCode()

Returns the hash code value for this map. The hash code of a map is defined to be the sum of the hash codes of each entry in the map's entrySet() view.

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class MiniMap<K,V>

Returns:

the hash code value for this map

toString

public String toString()

Returns a string representation of this map.

Overrides:

toString in class MiniMap<K,V>

Returns:

a string representation of this map