org.dmfs.jems.optional.adapters

Class MapEntry<K,V>

java.lang.Object

org.dmfs.jems.optional.adapters.MapEntry<K,V>

All Implemented Interfaces:

Optional<V>

public final class MapEntry<K,V>
extends java.lang.Object
implements Optional<V>

An Optional element of a Map. This is present if the given Map contains a non-null value for the given key.

Constructor Summary

Constructors

Constructor and Description
MapEntry(java.util.Map<K,V> map, K key)

Method Summary

Modifier and Type	Method and Description
boolean	isPresent() Returns whether the optional value is present.
V	value() Returns the optional value.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapEntry

public MapEntry(java.util.Map<K,V> map,
                K key)

Method Detail

isPresent

public boolean isPresent()

Description copied from interface: Optional

Returns whether the optional value is present.

Specified by:

isPresent in interface Optional<V>

Returns:

true if the value is present, false otherwise.

value

public V value()
        throws java.util.NoSuchElementException

Description copied from interface: Optional

Returns the optional value.

Specified by:

value in interface Optional<V>

Returns:

The value.

Throws:

java.util.NoSuchElementException - if the optional value is not present.