| /* |
| * Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com> 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.internal.storage.file; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.eclipse.jgit.lib.Constants; |
| import org.eclipse.jgit.lib.ReflogEntry; |
| import org.eclipse.jgit.lib.ReflogReader; |
| import org.eclipse.jgit.lib.Repository; |
| import org.eclipse.jgit.util.IO; |
| import org.eclipse.jgit.util.RawParseUtils; |
| |
| /** |
| * Utility for reading reflog entries |
| */ |
| class ReflogReaderImpl implements ReflogReader { |
| private File logName; |
| |
| /** |
| * @param db |
| * @param refname |
| */ |
| ReflogReaderImpl(Repository db, String refname) { |
| logName = new File(db.getDirectory(), Constants.LOGS + '/' + refname); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jgit.internal.storage.file.ReflogReaader#getLastEntry() |
| */ |
| /** {@inheritDoc} */ |
| @Override |
| public ReflogEntry getLastEntry() throws IOException { |
| return getReverseEntry(0); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jgit.internal.storage.file.ReflogReaader#getReverseEntries() |
| */ |
| /** {@inheritDoc} */ |
| @Override |
| public List<ReflogEntry> getReverseEntries() throws IOException { |
| return getReverseEntries(Integer.MAX_VALUE); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jgit.internal.storage.file.ReflogReaader#getReverseEntry(int) |
| */ |
| /** {@inheritDoc} */ |
| @Override |
| public ReflogEntry getReverseEntry(int number) throws IOException { |
| if (number < 0) |
| throw new IllegalArgumentException(); |
| |
| final byte[] log; |
| try { |
| log = IO.readFully(logName); |
| } catch (FileNotFoundException e) { |
| if (logName.exists()) { |
| throw e; |
| } |
| return null; |
| } |
| |
| int rs = RawParseUtils.prevLF(log, log.length); |
| int current = 0; |
| while (rs >= 0) { |
| rs = RawParseUtils.prevLF(log, rs); |
| if (number == current) |
| return new ReflogEntryImpl(log, rs < 0 ? 0 : rs + 2); |
| current++; |
| } |
| return null; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jgit.internal.storage.file.ReflogReaader#getReverseEntries(int) |
| */ |
| /** {@inheritDoc} */ |
| @Override |
| public List<ReflogEntry> getReverseEntries(int max) throws IOException { |
| final byte[] log; |
| try { |
| log = IO.readFully(logName); |
| } catch (FileNotFoundException e) { |
| if (logName.exists()) { |
| throw e; |
| } |
| return Collections.emptyList(); |
| } |
| |
| int rs = RawParseUtils.prevLF(log, log.length); |
| List<ReflogEntry> ret = new ArrayList<>(); |
| while (rs >= 0 && max-- > 0) { |
| rs = RawParseUtils.prevLF(log, rs); |
| ReflogEntry entry = new ReflogEntryImpl(log, rs < 0 ? 0 : rs + 2); |
| ret.add(entry); |
| } |
| return ret; |
| } |
| } |