Package org.eclipse.rdf4j.spring.dao.support.operation

Class OperationUtils

java.lang.Object

org.eclipse.rdf4j.spring.dao.support.operation.OperationUtils

public class OperationUtils
extends Object

Since:

4.0.0

Author:

Florian Kleedorfer

Constructor Summary

Constructors

Constructor	Description
OperationUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	atMostOne(Collection<T> objects)	Returns the object in the Collection wrapped in an Optional, an empty Optional if the collection is empty, throwing an Exception if the Collection contains more than one element.
static <T> T	exactlyOne(Collection<T> objects)	Returns the element in the Collection, throwing an exception if the collection is empty or contains more than one element.
static <T> T	require(Optional<T> required)	Returns the object contained in the specified Optional, throwing an Exception if it is empty.
static void	setBindings(Operation operation, Map<String,Value> bindings)
static <T> Collector<T,?,T>	toSingleton()	Returns the element in the Stream, throwing an exception if the stream is empty or contains more than one element.
static <T> Collector<T,?,T>	toSingletonMaybe()	Returns the element in the Stream, or null if the stream is empty, throwing an exception if the stream contains more than one element.
static <T> Collector<T,?,Optional<T>>	toSingletonOptional()	Returns the element in the Stream wrapped in an Optional throwing an exception if the stream contains more than one element.

Methods inherited from class java.lang.Object

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

Constructor Detail

OperationUtils

public OperationUtils()

Method Detail

atMostOne

public static <T> Optional<T> atMostOne(Collection<T> objects)

Returns the object in the Collection wrapped in an Optional, an empty Optional if the collection is empty, throwing an Exception if the Collection contains more than one element.

require

public static <T> T require(Optional<T> required)

Returns the object contained in the specified Optional, throwing an Exception if it is empty.

exactlyOne

public static <T> T exactlyOne(Collection<T> objects)

Returns the element in the Collection, throwing an exception if the collection is empty or contains more than one element.

toSingleton

public static <T> Collector<T,?,T> toSingleton()

Returns the element in the Stream, throwing an exception if the stream is empty or contains more than one element.

toSingletonMaybe

public static <T> Collector<T,?,T> toSingletonMaybe()

Returns the element in the Stream, or null if the stream is empty, throwing an exception if the stream contains more than one element.

toSingletonOptional

public static <T> Collector<T,?,Optional<T>> toSingletonOptional()

Returns the element in the Stream wrapped in an Optional throwing an exception if the stream contains more than one element.

setBindings

public static void setBindings(Operation operation,
                               Map<String,Value> bindings)