one.edee.darwin.model.version

Class VersionComparator

java.lang.Object

one.edee.darwin.model.version.VersionComparator

All Implemented Interfaces:

Serializable, Comparator<VersionDescriptor>

public class VersionComparator
extends Object
implements Comparator<VersionDescriptor>, Serializable

Compares two VersionDescriptor objects.

Author:

Jan Novotný, FG Forrest a.s. (c) 2007

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
VersionComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(VersionDescriptor o1, VersionDescriptor o2) Compares its two arguments for order.

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

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

VersionComparator

public VersionComparator()

Method Detail

compare

public int compare(VersionDescriptor o1,
                   VersionDescriptor o2)

Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)

The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.

Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.

It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."

Specified by:

compare in interface Comparator<VersionDescriptor>

Parameters:

o1 - the first object to be compared.

o2 - the second object to be compared.

Returns:

a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Throws:

ClassCastException - if the arguments' types prevent them from being compared by this Comparator.