org.jclouds.suppliers

Class SupplyKeyMatchingValueOrNull<K,V>

java.lang.Object

org.jclouds.suppliers.SupplyKeyMatchingValueOrNull<K,V>

All Implemented Interfaces:

com.google.common.base.Supplier<K>

Direct Known Subclasses:

GetRegionIdMatchingProviderURIOrNull

public class SupplyKeyMatchingValueOrNull<K,V>
extends Object
implements com.google.common.base.Supplier<K>

Allows you to lazy discover a key by value. This is useful for example in service discovery, where you need to see what the "current" service name is based on a map of service names to endpoints.

note

take care to memoize this using Suppliers.memoize(Supplier)

Field Summary

Fields

Modifier and Type	Field and Description
protected Logger	logger

Constructor Summary

Constructors

Constructor and Description
SupplyKeyMatchingValueOrNull(com.google.common.base.Supplier<Map<K,com.google.common.base.Supplier<V>>> supplier, com.google.common.base.Supplier<V> valueSupplier)

Method Summary

Modifier and Type	Method and Description
K	get()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected Logger logger

Constructor Detail

SupplyKeyMatchingValueOrNull

public SupplyKeyMatchingValueOrNull(com.google.common.base.Supplier<Map<K,com.google.common.base.Supplier<V>>> supplier,
                                    com.google.common.base.Supplier<V> valueSupplier)

Method Detail

get

public K get()

Specified by:

get in interface com.google.common.base.Supplier<K>