Module io.helidon.common.serviceloader

Package io.helidon.common.serviceloader

Class Priorities

java.lang.Object

io.helidon.common.serviceloader.Priorities

public final class Priorities
extends Object

Priority utilities.

Method Summary

Modifier and Type	Method	Description
static int	find(Class<?> aClass, int defaultPriority)	Find priority from class annotation, or return default if none found.
static int	find(Object anObject, int defaultPriority)	Find priority for an instance.
static <S> Comparator<S>	priorityComparator(int defaultPriority)	Returns a comparator for two objects, the classes for which are implementations of Prioritized, and/or optionally annotated with Priority and which applies a specified default priority if either or both classes lack the annotation.
static void	sort(List<?> list, int defaultPriority)	Sort the list based on priorities.
static void	sort(List<? extends Prioritized> list)	Sort the prioritized list based on priorities.

Methods inherited from class java.lang.Object

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

Method Details

find

public static int find(Class<?> aClass,
 int defaultPriority)

Find priority from class annotation, or return default if none found.

Parameters:

aClass - class to analyzed

defaultPriority - default priority of this class

Returns:

priority from Priorityor the default provided

find

public static int find(Object anObject,
 int defaultPriority)

Find priority for an instance. First checks if instance is Prioritized. If so, uses the value from it. Then checks for Priority annotation. If none of the above is found, returns the default priority.

Parameters:

anObject - object to find priority for

defaultPriority - default priority to use

Returns:

priority of the object or default provided

sort

public static void sort(List<? extends Prioritized> list)

Sort the prioritized list based on priorities.

Parameters:

list - list to sort

sort

public static void sort(List<?> list,
 int defaultPriority)

Sort the list based on priorities.

• If element implements Prioritized, uses its priority.
• If element is a class and has annotation Priority, uses its priority
• If element is any object and its class has annotation Priority, uses its priority

Parameters:

list - list to sort

defaultPriority - default priority for elements that do not have it

priorityComparator

public static <S> Comparator<S> priorityComparator(int defaultPriority)

Returns a comparator for two objects, the classes for which are implementations of Prioritized, and/or optionally annotated with Priority and which applies a specified default priority if either or both classes lack the annotation.

Type Parameters:

S - type of object being compared

Parameters:

defaultPriority - used if the classes for either or both objects lack the Priority annotation

Returns:

comparator