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An interface defining a comparator which compares two records (in an implementation-defined manner) to see if they match or what their relative sort order is. The application implements this interface to compare two candidate records. The return value must indicate the ordering of the two records. The compare method is called by RecordEnumeration to sort and return records in an application specified order. For example:
RecordComparator c = new AddressRecordComparator(); if (c.compare(recordStore.getRecord(rec1), recordStore.getRecord(rec2)) == RecordComparator.PRECEDES) return rec1;
Field Summary | |
static int |
EQUIVALENT
EQUIVALENT means that in terms of search or sort order, the two records are the same. |
static int |
FOLLOWS
FOLLOWS means that the left (first parameter) record follows the right (second parameter) record in terms of search or sort order. |
static int |
PRECEDES
PRECEDES means that the left (first parameter) record precedes the right (second parameter) record in terms of search or sort order. |
Method Summary | |
int |
compare(byte[] rec1,
byte[] rec2)
Returns RecordComparator.PRECEDES if rec1
precedes rec2 in sort order, or RecordComparator.FOLLOWS
if rec1 follows rec2 in sort order, or
RecordComparator.EQUIVALENT if rec1 and rec2
are equivalent in terms of sort order. |
Field Detail |
public static final int EQUIVALENT
The value of EQUIVALENT is 0.
public static final int FOLLOWS
The value of FOLLOWS is 1.
public static final int PRECEDES
The value of PRECEDES is -1.
Method Detail |
public int compare(byte[] rec1, byte[] rec2)
RecordComparator.PRECEDES
if rec1
precedes rec2 in sort order, or RecordComparator.FOLLOWS
if rec1 follows rec2 in sort order, or
RecordComparator.EQUIVALENT
if rec1 and rec2
are equivalent in terms of sort order.rec1
- the first record to use for comparison. Within this
method, the application must treat this parameter as
read-only.rec2
- the second record to use for comparison. Within
this method, the application must treat this parameter
as read-only.RecordComparator.PRECEDES
if rec1 precedes
rec2 in sort order, or
RecordComparator.FOLLOWS
if rec1 follows
rec2 in sort order, or
RecordComparator.EQUIVALENT
if rec1 and
rec2 are equivalent in terms of sort order
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