org.apache.brooklyn.util.text

Class NaturalOrderComparator

java.lang.Object

org.apache.brooklyn.util.text.NaturalOrderComparator

All Implemented Interfaces:

java.util.Comparator<java.lang.String>

public class NaturalOrderComparator
extends java.lang.Object
implements java.util.Comparator<java.lang.String>

comparator which takes two strings and puts them in an order with special rules for numbers (whole number) to be placed in numeric order; e.g. "10">"9", including when those numbers occur in the midst of equal text; e.g. "a10" > "a9"; but not if the text differs; e.g. "a10" < "b9". leading zeroes are slightly lower than the same number without the leading zero, so "8" < "09" < "9", but after considering the remainder of the string, so "09.b" > "9.a". decimals are treated like a word-split, not a decimal point, i.e. "1.9" < "1.10".

this does not return anything as equal unless they are the same string.

class is thread-safe.

nulls not supported. to support nulls, wrap in guava: Ordering.from(NaturalOrderComparator.INSTANCE).nullsFirst())

Based on https://github.com/paour/natorder

Field Summary

Fields

Modifier and Type	Field and Description
static NaturalOrderComparator	INSTANCE

Constructor Summary

Constructors

Constructor and Description
NaturalOrderComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(java.lang.String a, java.lang.String b)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

INSTANCE

public static final NaturalOrderComparator INSTANCE

Constructor Detail

NaturalOrderComparator

public NaturalOrderComparator()

Method Detail

compare

public int compare(java.lang.String a,
                   java.lang.String b)

Specified by:

compare in interface java.util.Comparator<java.lang.String>