net.sf.saxon.sort
Class AlphanumericComparer

java.lang.Object
  net.sf.saxon.sort.AlphanumericComparer

All Implemented Interfaces:

Serializable, StringCollator

public class AlphanumericComparer
extends Object
implements StringCollator, Serializable

A Comparer that treats strings as an alternating sequence of alpha parts and numeric parts. The alpha parts are compared using a base collation supplied as a parameter; the numeric parts are compared numerically. "Numeric" here means a sequence of consecutive ASCII digits 0-9.

Note: this StringCollator produces an ordering that is not compatible with equals().

See Also:

Serialized Form

Constructor Summary

AlphanumericComparer(StringCollator base)

Method Summary

int	compareStrings(String s1, String s2) Compare two objects.
Object	getCollationKey(String s, Platform platform) Get a collation key for two Strings.

Methods inherited from class java.lang.Object

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

Constructor Detail

AlphanumericComparer

public AlphanumericComparer(StringCollator base)

Method Detail

compareStrings

public int compareStrings(String s1,
                          String s2)

Compare two objects.

Specified by:

compareStrings in interface StringCollator

Parameters:

s1 - the first string

s2 - the second string

Returns:

<0 if a0 if a>b

getCollationKey

public Object getCollationKey(String s,
                              Platform platform)

Get a collation key for two Strings. The essential property of collation keys is that if two values are equal under the collation, then the collation keys are compare correctly under the equals() method.

Specified by:

getCollationKey in interface StringCollator