Package net.sf.saxon.sort
Class EmptyGreatestComparer
- java.lang.Object
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- net.sf.saxon.sort.EmptyGreatestComparer
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- All Implemented Interfaces:
java.io.Serializable
,java.util.Comparator
public class EmptyGreatestComparer extends java.lang.Object implements java.util.Comparator, java.io.Serializable
A Comparer that modifies a base comparer by sorting empty key values and NaN values last (greatest), as opposed to the default which sorts them first.- Author:
- Michael H. Kay
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description EmptyGreatestComparer(AtomicComparer baseComparer)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compare(java.lang.Object a, java.lang.Object b)
Compare two AtomicValue objects according to the rules for their data type.
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Constructor Detail
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EmptyGreatestComparer
public EmptyGreatestComparer(AtomicComparer baseComparer)
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Method Detail
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compare
public int compare(java.lang.Object a, java.lang.Object b)
Compare two AtomicValue objects according to the rules for their data type. UntypedAtomic values are compared as if they were strings; if different semantics are wanted, the conversion must be done by the caller.- Specified by:
compare
in interfacejava.util.Comparator
- Parameters:
a
- the first object to be compared. It is intended that this should normally be an instance of AtomicValue, though this restriction is not enforced. If it is a StringValue, the collator is used to compare the values, otherwise the value must implement the java.util.Comparable interface.b
- the second object to be compared. This must be comparable with the first object: for example, if one is a string, they must both be strings.- Returns:
- <0 if a0 if a>b
- Throws:
java.lang.ClassCastException
- if the objects are not comparable
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