org.eclipse.jgit.revwalk.RevWalkUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2011, Robin Stocker
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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package org.eclipse.jgit.revwalk;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
/**
* Utility methods for {@link RevWalk}.
*/
public final class RevWalkUtils {
private RevWalkUtils() {
// Utility class
}
/**
* Count the number of commits that are reachable from start
* until a commit that is reachable from end is encountered. In
* other words, count the number of commits that are in start,
* but not in end.
*
* Note that this method calls {@link RevWalk#reset()} at the beginning.
* Also note that the existing rev filter on the walk is left as-is, so be
* sure to set the right rev filter before calling this method.
*
* @param walk
* the rev walk to use
* @param start
* the commit to start counting from
* @param end
* the commit where counting should end, or null if counting
* should be done until there are no more commits
*
* @return the number of commits
* @throws MissingObjectException
* @throws IncorrectObjectTypeException
* @throws IOException
*/
public static int count(final RevWalk walk, final RevCommit start,
final RevCommit end) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
walk.reset();
walk.markStart(start);
if (end != null)
walk.markUninteresting(end);
int count = 0;
for (RevCommit c = walk.next(); c != null; c = walk.next())
count++;
return count;
}
}