Package org.apache.wiki.util.comparators

Class HumanComparator

java.lang.Object

org.apache.wiki.util.comparators.HumanComparator

All Implemented Interfaces:

Comparator<String>

public class HumanComparator
extends Object
implements Comparator<String>

A comparator that sorts Strings using "human" ordering, including decimal ordering. Only works for languages where every character is lexicographically distinct and correctly unicode ordered (e.g. English). Other languages should use CollatedHumanComparator. Pretty efficient but still slower than String.compareTo().

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	HumanComparator.CharType

Field Summary

Fields

Modifier and Type	Field	Description
static final Comparator<String>	DEFAULT_HUMAN_COMPARATOR

Constructor Summary

Constructors

Constructor	Description
HumanComparator()	Default constructor which does nothing.
HumanComparator(HumanComparator.CharType[] sortOrder)	Constructor specifying all the character type order.

Method Summary

Modifier and Type	Method	Description
int	compare(String str1, String str2)
static Comparator<String>	getInstance()	Returns a singleton comparator that implements the default behaviour.
HumanComparator.CharType[]	getSortOrder()
void	setSortOrder(HumanComparator.CharType[] sortOrder)	Set the order in which letters, numbers and everything else is presented.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

DEFAULT_HUMAN_COMPARATOR

public static final Comparator<String> DEFAULT_HUMAN_COMPARATOR

Constructor Details

HumanComparator

public HumanComparator()

Default constructor which does nothing. Here because it has a non-default constructor.

HumanComparator

public HumanComparator(HumanComparator.CharType[] sortOrder)

Constructor specifying all the character type order.

Parameters:

sortOrder - see setSortOrder

Method Details

getInstance

public static Comparator<String> getInstance()

Returns a singleton comparator that implements the default behaviour.

Returns:

the singleton comparator.

compare

public int compare(String str1,
 String str2)

Specified by:

compare in interface Comparator<String>

getSortOrder

public HumanComparator.CharType[] getSortOrder()

setSortOrder

public void setSortOrder(HumanComparator.CharType[] sortOrder)

Set the order in which letters, numbers and everything else is presented. Default is other, digits and then letters. For example, the strings "abb", "a1b" and "a b" will sort in the order "a b", "a1b" then "abb" by default.

Parameters:

sortOrder - Must be an array of CharType containing exactly 3 elements each of which must be distinct.

Throws:

IllegalArgumentException - if being called on the result of HumanStringComparator.getInstance() or sortOrder is not exactly 3 different CharType.