com.google.gerrit.server.util

Class MostSpecificComparator

java.lang.Object

com.google.gerrit.server.util.MostSpecificComparator

All Implemented Interfaces:

Comparator<RefConfigSection>

public final class MostSpecificComparator
extends Object
implements Comparator<RefConfigSection>

Order the Ref Pattern by the most specific. This sort is done by:

• 1 - The minor value of Levenshtein string distance between the branch name and the regex string shortest example. A shorter distance is a more specific match.
• 2 - Finites first, infinities after.
• 3 - Number of transitions. More transitions is more specific.
• 4 - Length of the expression text.

Levenshtein distance is a measure of the similarity between two strings. The distance is the number of deletions, insertions, or substitutions required to transform one string into another.

For example, if given refs/heads/m* and refs/heads/*, the distances are 5 and 6. It means that refs/heads/m* is more specific because it's closer to refs/heads/master than refs/heads/*.

Another example could be refs/heads/* and refs/heads/[a-zA-Z]*, the distances are both 6. Both are infinite, but refs/heads/[a-zA-Z]* has more transitions, which after all turns it more specific.

Constructor Summary

Constructors

Constructor and Description
MostSpecificComparator(String refName)

Method Summary

Modifier and Type	Method and Description
int	compare(RefConfigSection a, RefConfigSection b)
int	compare(String pattern1, String pattern2)

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

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

MostSpecificComparator

public MostSpecificComparator(String refName)

Method Detail

compare

public int compare(RefConfigSection a,
                   RefConfigSection b)

Specified by:

compare in interface Comparator<RefConfigSection>

compare

public int compare(String pattern1,
                   String pattern2)