org.springframework.boot.util

Class LambdaSafe.InvocationResult<R>

java.lang.Object

org.springframework.boot.util.LambdaSafe.InvocationResult<R>

Type Parameters:

R - the result type

Enclosing class:

LambdaSafe

public static final class LambdaSafe.InvocationResult<R>
extends java.lang.Object

The result of a callback which may be a value, null or absent entirely if the callback wasn't suitable. Similar in design to Optional but allows for null as a valid value.

Method Summary

Modifier and Type	Method and Description
R	get() Return the result of the invocation or null if the callback wasn't suitable.
R	get(R fallback) Return the result of the invocation or the given fallback if the callback wasn't suitable.
boolean	hasResult() Return true if a result in present.
static <R> LambdaSafe.InvocationResult<R>	noResult() Return an LambdaSafe.InvocationResult instance representing no result.
static <R> LambdaSafe.InvocationResult<R>	of(R value) Create a new LambdaSafe.InvocationResult instance with the specified value.

Methods inherited from class java.lang.Object

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

Method Detail

hasResult

public boolean hasResult()

Return true if a result in present.

Returns:

if a result is present

get

public R get()

Return the result of the invocation or null if the callback wasn't suitable.

Returns:

the result of the invocation or null

get

public R get(R fallback)

Return the result of the invocation or the given fallback if the callback wasn't suitable.

Parameters:

fallback - the fallback to use when there is no result

Returns:

the result of the invocation or the fallback

of

public static <R> LambdaSafe.InvocationResult<R> of(R value)

Create a new LambdaSafe.InvocationResult instance with the specified value.

Type Parameters:

R - the result type

Parameters:

value - the value (may be null)

Returns:

an LambdaSafe.InvocationResult

noResult

public static <R> LambdaSafe.InvocationResult<R> noResult()

Return an LambdaSafe.InvocationResult instance representing no result.

Type Parameters:

R - the result type

Returns:

an LambdaSafe.InvocationResult