程序包 cn.taketoday.util

类 LambdaSafe.InvocationResult<R>

java.lang.Object

cn.taketoday.util.LambdaSafe.InvocationResult<R>

类型参数:

R - the result type

封闭类:

LambdaSafe

public static final class LambdaSafe.InvocationResult<R>
extends 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.

字段概要

字段

修饰符和类型	字段	说明
private static final LambdaSafe.InvocationResult<?>	NONE
private final R	value

构造器概要

构造器

限定符	构造器	说明
private	InvocationResult(R value)

方法概要

修饰符和类型	方法	说明
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.

从类继承的方法 java.lang.Object

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

字段详细资料

NONE

private static final LambdaSafe.InvocationResult<?> NONE

value

private final R value

构造器详细资料

InvocationResult

private InvocationResult(R value)

方法详细资料

hasResult

public boolean hasResult()

Return true if a result in present.

返回:

if a result is present

get

public R get()

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

返回:

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.

参数:

fallback - the fallback to use when there is no result

返回:

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.

类型参数:

R - the result type

参数:

value - the value (may be null)

返回:

an LambdaSafe.InvocationResult

noResult

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

Return an LambdaSafe.InvocationResult instance representing no result.

类型参数:

R - the result type

返回:

an LambdaSafe.InvocationResult