org.eclipse.jgit.diff
Class RawTextComparator

java.lang.Object
  org.eclipse.jgit.diff.SequenceComparator<RawText>
      org.eclipse.jgit.diff.RawTextComparator

public abstract class RawTextComparator
extends SequenceComparator<RawText>

Equivalence function for RawText.

Field Summary

static RawTextComparator	DEFAULT No special treatment.
static RawTextComparator	WS_IGNORE_ALL Ignores all whitespace.
static RawTextComparator	WS_IGNORE_CHANGE Ignores whitespace occurring between non-whitespace characters.
static RawTextComparator	WS_IGNORE_LEADING Ignores leading whitespace.
static RawTextComparator	WS_IGNORE_TRAILING Ignores trailing whitespace.

Constructor Summary

RawTextComparator()

Method Summary

int	hash(RawText seq, int lno) Get a hash value for an item in a sequence.
protected abstract int	hashRegion(byte[] raw, int ptr, int end) Compute a hash code for a region.
Edit	reduceCommonStartEnd(RawText a, RawText b, Edit e) Modify the edit to remove common leading and trailing items.

Methods inherited from class org.eclipse.jgit.diff.SequenceComparator

equals

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final RawTextComparator DEFAULT

No special treatment.

WS_IGNORE_ALL

public static final RawTextComparator WS_IGNORE_ALL

Ignores all whitespace.

WS_IGNORE_LEADING

public static final RawTextComparator WS_IGNORE_LEADING

Ignores leading whitespace.

WS_IGNORE_TRAILING

public static final RawTextComparator WS_IGNORE_TRAILING

Ignores trailing whitespace.

WS_IGNORE_CHANGE

public static final RawTextComparator WS_IGNORE_CHANGE

Ignores whitespace occurring between non-whitespace characters.

Constructor Detail

RawTextComparator

public RawTextComparator()

Method Detail

hash

public int hash(RawText seq,
                int lno)

Description copied from class: SequenceComparator

Get a hash value for an item in a sequence. If two items are equal according to this comparator's SequenceComparator.equals(Sequence, int, Sequence, int) method, then this hash method must produce the same integer result for both items. It is not required for two items to have different hash values if they are are unequal according to the equals() method.

Specified by:

hash in class SequenceComparator<RawText>

Parameters:

seq - the sequence.

lno - the item to obtain the hash for.

Returns:

hash the hash value.

reduceCommonStartEnd

public Edit reduceCommonStartEnd(RawText a,
                                 RawText b,
                                 Edit e)

Description copied from class: SequenceComparator

Modify the edit to remove common leading and trailing items. The supplied edit e is reduced in size by moving the beginning A and B points so the edit does not cover any items that are in common between the two sequences. The ending A and B points are also shifted to remove common items from the end of the region.

Overrides:

reduceCommonStartEnd in class SequenceComparator<RawText>

Parameters:

a - the first sequence.

b - the second sequence.

e - the edit to start with and update.

Returns:

e if it was updated in-place, otherwise a new edit containing the reduced region.

hashRegion

protected abstract int hashRegion(byte[] raw,
                                  int ptr,
                                  int end)

Compute a hash code for a region.

Parameters:

raw - the raw file content.

ptr - first byte of the region to hash.

end - 1 past the last byte of the region.

Returns:

hash code for the region [ptr, end) of raw.