com.sun.jersey.core.util.PriorityUtil Maven / Gradle / Ivy
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package com.sun.jersey.core.util;
import java.util.Comparator;
/**
* Utility code for work with {@link Priority} annotated types.
*
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
public class PriorityUtil {
/**
* Default priority value for factory types that do not have
* their priority set explicitly using {@link Priority} annotation.
*/
public static final int DEFAULT_PRIORITY = 100;
/**
* Convenience comparator instance.
*/
public static final InstanceComparator INSTANCE_COMPARATOR = new InstanceComparator();
/**
* Comparator for instances of types annotated with Priority
* annotation.
*/
public static final class InstanceComparator implements Comparator {
@Override
public int compare(Object o1, Object o2) {
return priorityOf(o2) - priorityOf(o1);
}
private int priorityOf(Object o) {
final Priority priorityAnnotation = o.getClass().getAnnotation(Priority.class);
return priorityAnnotation == null ? DEFAULT_PRIORITY : priorityAnnotation.value();
}
}
/**
* Comparator for types annotated with Priority
* annotation.
*/
public static class TypeComparator implements Comparator> {
@Override
public int compare(Class o1, Class o2) {
return priorityOf(o2) - priorityOf(o1);
}
private int priorityOf(Class o) {
final Priority priorityAnnotation = o.getAnnotation(Priority.class);
return priorityAnnotation == null ? DEFAULT_PRIORITY : priorityAnnotation.value();
}
}
}