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Expose AnyObjectId compareTo(byte[]) and compareTo(int[]) 

Storage systems can use these implementations to compare a passed
AnyObjectId with a stored representation of an ObjectId in the
canonical network byte order format.  This can be useful to do a
binary search, or just linear scan, over an encoded storage file.

Change-Id: I8c72993c4f4c6e98d599ac2c9867453752f25fd2
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2010-06-18 17:38:22 -07:00
parent 864cc3de10
commit 677b9b17e2
1 changed files with 24 additions and 2 deletions
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26
org.eclipse.jgit/src/org/eclipse/jgit/lib/AnyObjectId.java
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@ -142,7 +142,18 @@ public int compareTo(final Object other) {
return compareTo(((ObjectId) other));
}
int compareTo(final byte[] bs, final int p) {
/**
* Compare this ObjectId to a network-byte-order ObjectId.
*
* @param bs
* array containing the other ObjectId in network byte order.
* @param p
* position within {@code bs} to start the compare at. At least
* 20 bytes, starting at this position are required.
* @return a negative integer, zero, or a positive integer as this object is
* less than, equal to, or greater than the specified object.
*/
public int compareTo(final byte[] bs, final int p) {
int cmp;
cmp = NB.compareUInt32(w1, NB.decodeInt32(bs, p));
@ -164,7 +175,18 @@ int compareTo(final byte[] bs, final int p) {
return NB.compareUInt32(w5, NB.decodeInt32(bs, p + 16));
}
int compareTo(final int[] bs, final int p) {
/**
* Compare this ObjectId to a network-byte-order ObjectId.
*
* @param bs
* array containing the other ObjectId in network byte order.
* @param p
* position within {@code bs} to start the compare at. At least 5
* integers, starting at this position are required.
* @return a negative integer, zero, or a positive integer as this object is
* less than, equal to, or greater than the specified object.
*/
public int compareTo(final int[] bs, final int p) {
int cmp;
cmp = NB.compareUInt32(w1, bs[p]);