org.afcs.warts.db
Class KeyComparator
java.lang.Object
org.afcs.warts.db.KeyComparator
- All Implemented Interfaces:
- java.util.Comparator
- public final class KeyComparator
- extends java.lang.Object
- implements java.util.Comparator
The KeyComparator class provides a singleton instance
that can be used to compare lists of objects based on their own intrinsic
Comparable properties, or their string values if all else fails. Lists of
objects are, of course, what are used to store primary key values in
DataSet
.
LICENSE: This code is released to the public domain and
may be used for any purpose whatsoever without permission or
acknowledgment.
- Version:
- Last Modified 15 October 2003
- Author:
- Warren Hedley ( whedley at sdsc dot edu )
Field Summary |
static java.util.Comparator |
KEY_COMPARATOR
The singleton instance that should be used to perform primary key
comparisons. |
Method Summary |
int |
compare(java.lang.Object o1,
java.lang.Object o2)
Compares to non-null java.util.List instances, returning am
integer that can be used to sort them into ascending order based on their
own Comparable properties, or if they don't implement Comparable,
their string values. |
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 |
KEY_COMPARATOR
public static final java.util.Comparator KEY_COMPARATOR
- The singleton instance that should be used to perform primary key
comparisons.
compare
public int compare(java.lang.Object o1,
java.lang.Object o2)
- Compares to non-null
java.util.List
instances, returning am
integer that can be used to sort them into ascending order based on their
own Comparable properties, or if they don't implement Comparable,
their string values.
- Specified by:
compare
in interface java.util.Comparator
- Parameters:
o1
- The first object to consider.o2
- The second object to consider.
- Returns:
- An integer that can be used to sort a list of lists into
ascending order.
- Throws:
java.lang.IllegalArgumentException
- If either object is null or not a
java.util.List
instance.