NullFirstComparator (InterMine 5.0.0 API)

java.lang.Object
- org.intermine.util.NullFirstComparator

All Implemented Interfaces:

java.util.Comparator<java.lang.Object>
```
public final class NullFirstComparator
extends java.lang.Object
implements java.util.Comparator<java.lang.Object>
```
A Comparator that uses the natural ordering of elements implementing Comparable, plus null is allowed and always before all other elements. It also copes with Boolean values, placing them after null but before other values, TRUE before FALSE.

Author:

Matthew Wakeling

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static NullFirstComparator SINGLETON
  Publicly-accessible instance
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  int compare(java.lang.Object o1, java.lang.Object o2)
  - 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 Detail

SINGLETON

public static final NullFirstComparator SINGLETON

Publicly-accessible instance

Method Detail
- compare
```
public int compare(java.lang.Object o1,
                   java.lang.Object o2)
```
  Specified by:
  
  compare in interface java.util.Comparator<java.lang.Object>