| /* |
| * Copyright (C) 2011, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.blame; |
| |
| /** |
| * Region of the result that still needs to be computed. |
| * <p> |
| * Regions are held in a singly-linked-list by {@link Candidate} using the |
| * {@link Candidate#regionList} field. The list is kept in sorted order by |
| * {@link #resultStart}. |
| */ |
| class Region { |
| /** Next entry in the region linked list. */ |
| Region next; |
| |
| /** First position of this region in the result file blame is computing. */ |
| int resultStart; |
| |
| /** First position in the {@link Candidate} that owns this Region. */ |
| int sourceStart; |
| |
| /** Length of the region, always >= 1. */ |
| int length; |
| |
| Region(int rs, int ss, int len) { |
| resultStart = rs; |
| sourceStart = ss; |
| length = len; |
| } |
| |
| /** |
| * Copy the entire result region, but at a new source position. |
| * |
| * @param newSource |
| * the new source position. |
| * @return the same result region, but offset for a new source. |
| */ |
| Region copy(int newSource) { |
| return new Region(resultStart, newSource, length); |
| } |
| |
| /** |
| * Split the region, assigning a new source position to the first half. |
| * |
| * @param newSource |
| * the new source position. |
| * @param newLen |
| * length of the new region. |
| * @return the first half of the region, at the new source. |
| */ |
| Region splitFirst(int newSource, int newLen) { |
| return new Region(resultStart, newSource, newLen); |
| } |
| |
| /** |
| * Edit this region to remove the first {@code d} elements. |
| * |
| * @param d |
| * number of elements to remove from the start of this region. |
| */ |
| void slideAndShrink(int d) { |
| resultStart += d; |
| sourceStart += d; |
| length -= d; |
| } |
| |
| Region deepCopy() { |
| Region head = new Region(resultStart, sourceStart, length); |
| Region tail = head; |
| for (Region n = next; n != null; n = n.next) { |
| Region q = new Region(n.resultStart, n.sourceStart, n.length); |
| tail.next = q; |
| tail = q; |
| } |
| return head; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String toString() { |
| StringBuilder buf = new StringBuilder(); |
| Region r = this; |
| do { |
| if (r != this) |
| buf.append(','); |
| buf.append(r.resultStart); |
| buf.append('-'); |
| buf.append(r.resultStart + r.length); |
| r = r.next; |
| } while (r != null); |
| return buf.toString(); |
| } |
| } |