at.molindo.utils.data

Class ComparatorUtils

java.lang.Object

at.molindo.utils.data.ComparatorUtils

public class ComparatorUtils
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.Comparator<?>	NULL_HIGH_COMPARABLE a comparator that compares Comparable objects using nullHighCompareTo(Comparable, Object)
static java.util.Comparator<?>	NULL_LOW_COMPARABLE a comparator that compares Comparable objects using nullLowCompareTo(Comparable, Object)

Constructor Summary

Constructors

Constructor and Description
ComparatorUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> java.util.Comparator<T>	nullHighComparable()
static <T> int	nullHighCompareTo(java.lang.Comparable<T> o1, T o2) null-safe invocation of Comparable.compareTo(Object) placing null at the end of a sorted list (assuming each null is equal)
static <T> java.util.Comparator<T>	nullLowComparable()
static <T> int	nullLowCompareTo(java.lang.Comparable<T> o1, T o2) null-safe invocation of Comparable.compareTo(Object) placing null at the beginning of a sorted list (assuming each null is equal)

Methods inherited from class java.lang.Object

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

Field Detail

NULL_LOW_COMPARABLE

public static final java.util.Comparator<?> NULL_LOW_COMPARABLE

a comparator that compares Comparable objects using nullLowCompareTo(Comparable, Object)

NULL_HIGH_COMPARABLE

public static final java.util.Comparator<?> NULL_HIGH_COMPARABLE

a comparator that compares Comparable objects using nullHighCompareTo(Comparable, Object)

Constructor Detail

ComparatorUtils

public ComparatorUtils()

Method Detail

nullLowComparable

public static final <T> java.util.Comparator<T> nullLowComparable()

See Also:

NULL_LOW_COMPARABLE

nullHighComparable

public static final <T> java.util.Comparator<T> nullHighComparable()

See Also:

NULL_HIGH_COMPARABLE

nullLowCompareTo

public static <T> int nullLowCompareTo(java.lang.Comparable<T> o1,
                       T o2)

null-safe invocation of Comparable.compareTo(Object) placing null at the beginning of a sorted list (assuming each null is equal)

Returns:

a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Assuming null is less than any object and equal to itself.

See Also:

Comparable.compareTo(Object)

nullHighCompareTo

public static <T> int nullHighCompareTo(java.lang.Comparable<T> o1,
                        T o2)

null-safe invocation of Comparable.compareTo(Object) placing null at the end of a sorted list (assuming each null is equal)

Returns:

a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Assuming null is greater than any object and equal to itself.

See Also:

Comparable.compareTo(Object)