org.axonframework.common

Class ObjectUtils

java.lang.Object

org.axonframework.common.ObjectUtils

public abstract class ObjectUtils
extends Object

Miscellaneous object utility methods.

Since:

3.0

Author:

Allard Buijze

Method Summary

Modifier and Type	Method and Description
static <T extends CharSequence> T	getNonEmptyOrDefault(T instance, T defaultValue) Returns the given instance, if not null or of zero length, or otherwise the given defaultValue.
static <I,T> T	getOrDefault(I instance, Function<I,T> valueProvider, T defaultValue) Returns the result of the given valueProvider by ingesting the given instance, if the instance is not null.
static <T> T	getOrDefault(T instance, Supplier<T> defaultProvider) Returns the given instance, if not null, or otherwise the value provided by defaultProvider.
static <T> T	getOrDefault(T instance, T defaultValue) Returns the given instance, if not null, or otherwise the given defaultValue.
static long	getRemainingOfDeadline(long deadline) Gets number of millis which are remaining of current deadline to be reached by System.currentTimeMillis().
static <T> Class<T>	nullSafeTypeOf(T instance) Returns the type of the given instance, if it is not null.
static <T> Supplier<T>	sameInstanceSupplier(Supplier<T> supplier) Wraps the given supplier to ensure that the same instance is returned on multiple consecutive invocations.

Methods inherited from class java.lang.Object

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

Method Detail

getOrDefault

public static <T> T getOrDefault(T instance,
                                 Supplier<T> defaultProvider)

Returns the given instance, if not null, or otherwise the value provided by defaultProvider.

Type Parameters:

T - the type of value to return

Parameters:

instance - the value to return, if not null

defaultProvider - to provide the value, when instance is null

Returns:

instance if not null, otherwise the value provided by defaultProvider

getOrDefault

public static <T> T getOrDefault(T instance,
                                 T defaultValue)

Returns the given instance, if not null, or otherwise the given defaultValue.

Type Parameters:

T - the type of value to return

Parameters:

instance - the value to return, if not null

defaultValue - the value, when instance is null

Returns:

instance if not null, otherwise defaultValue

getNonEmptyOrDefault

public static <T extends CharSequence> T getNonEmptyOrDefault(T instance,
                                                              T defaultValue)

Returns the given instance, if not null or of zero length, or otherwise the given defaultValue.

Type Parameters:

T - the type of value to return

Parameters:

instance - the value to return, if not null

defaultValue - the value, when instance is null

Returns:

instance if not null, otherwise defaultValue

getOrDefault

public static <I,T> T getOrDefault(I instance,
                                   Function<I,T> valueProvider,
                                   T defaultValue)

Returns the result of the given valueProvider by ingesting the given instance, if the instance is not null. If it is, the defaultValue is returned.

Type Parameters:

I - the type of the instance to verify and use by the valueProvider

T - the type of value to return

Parameters:

instance - the value to verify if it is not null. If it isn't, the given valueProvider will be invoked with this object

valueProvider - the function to return the result of by ingesting the instance if it is not null

defaultValue - the value to return if the given instance is null

Returns:

the output of valueProvider by ingesting instance if it is not null, otherwise the defaultValue

nullSafeTypeOf

public static <T> Class<T> nullSafeTypeOf(T instance)

Returns the type of the given instance, if it is not null. If it is null, Object.getClass() will be returned.

Type Parameters:

T - the generic type of the Class to return

Parameters:

instance - the object to return the type for

Returns:

the type of the given instance if it is not null, otherwise Object.getClass()

getRemainingOfDeadline

public static long getRemainingOfDeadline(long deadline)

Gets number of millis which are remaining of current deadline to be reached by System.currentTimeMillis(). If deadline is passed, 0 will be returned.

Parameters:

deadline - deadline to be met

Returns:

number of millis to deadline

sameInstanceSupplier

public static <T> Supplier<T> sameInstanceSupplier(Supplier<T> supplier)

Wraps the given supplier to ensure that the same instance is returned on multiple consecutive invocations. While it guarantees that the same instance is returned, concurrent access may cause given supplier to be invoked more than one.

Type Parameters:

T - The type of object supplied

Parameters:

supplier - The supplier to provide the instance to return

Returns:

a supplier that returns the same instance