Package org.eclipse.jgit.diff

Class SubsequenceComparator<S extends Sequence>

java.lang.Object

org.eclipse.jgit.diff.SequenceComparator<Subsequence<S>>

org.eclipse.jgit.diff.SubsequenceComparator<S>

Type Parameters:

S - the base sequence type.

public final class SubsequenceComparator<S extends Sequence>
extends SequenceComparator<Subsequence<S>>

Wrap another comparator for use with Subsequence.

This comparator acts as a proxy for the real comparator, translating element indexes on the fly by adding the subsequence's begin offset to them. Comparators of this type must be used with a Subsequence.

Constructor Summary

Constructors

Constructor	Description
SubsequenceComparator(SequenceComparator<? super S> cmp)	Construct a comparator wrapping another comparator.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Subsequence<S> a, int ai, Subsequence<S> b, int bi)	Compare two items to determine if they are equivalent.
int	hash(Subsequence<S> seq, int ptr)	Get a hash value for an item in a sequence.

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

reduceCommonStartEnd

Methods inherited from class java.lang.Object

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

Constructor Detail

SubsequenceComparator

public SubsequenceComparator(SequenceComparator<? super S> cmp)

Construct a comparator wrapping another comparator.

Parameters:

cmp - the real comparator.

Method Detail

equals

public boolean equals(Subsequence<S> a,
                      int ai,
                      Subsequence<S> b,
                      int bi)

Compare two items to determine if they are equivalent. It is permissible to compare sequence a with itself (by passing a again in position b).

Specified by:

equals in class SequenceComparator<Subsequence<S extends Sequence>>

Parameters:

a - the first sequence.

ai - item of ai to compare.

b - the second sequence.

bi - item of bi to compare.

Returns:

true if the two items are identical according to this function's equivalence rule.

hash

public int hash(Subsequence<S> seq,
                int ptr)

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 unequal according to the equals() method.

Specified by:

hash in class SequenceComparator<Subsequence<S extends Sequence>>

Parameters:

seq - the sequence.

ptr - the item to obtain the hash for.

Returns:

hash the hash value.