Mercurial > jhg
view src/org/tmatesoft/hg/core/HgChangeset.java @ 288:b11f6a08f748
Avoid boxing int values and list resizes on revlog read
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
---|---|
date | Sat, 10 Sep 2011 00:18:39 +0200 |
parents | 9fb50c04f03c |
children | ee6b467c1a5f |
line wrap: on
line source
/* * Copyright (c) 2011 TMate Software Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For information on how to redistribute this software under * the terms of a license other than GNU General Public License * contact TMate Software at support@hg4j.com */ package org.tmatesoft.hg.core; import java.util.ArrayList; import java.util.Collections; import java.util.List; import org.tmatesoft.hg.repo.HgChangelog.RawChangeset; import org.tmatesoft.hg.repo.HgChangelog; import org.tmatesoft.hg.repo.HgRepository; import org.tmatesoft.hg.repo.HgStatusCollector; import org.tmatesoft.hg.util.Path; /** * Record in the Mercurial changelog, describing single commit. * * Not thread-safe, don't try to read from different threads * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public class HgChangeset implements Cloneable { private final HgStatusCollector statusHelper; private final Path.Source pathHelper; private HgChangelog.ParentWalker parentHelper; // private RawChangeset changeset; private Nodeid nodeid; // private List<HgFileRevision> modifiedFiles, addedFiles; private List<Path> deletedFiles; private int revNumber; private byte[] parent1, parent2; // XXX consider CommandContext with StatusCollector, PathPool etc. Commands optionally get CC through a cons or create new // and pass it around /*package-local*/HgChangeset(HgStatusCollector statusCollector, Path.Source pathFactory) { statusHelper = statusCollector; pathHelper = pathFactory; } /*package-local*/ void init(int localRevNumber, Nodeid nid, RawChangeset rawChangeset) { revNumber = localRevNumber; nodeid = nid; changeset = rawChangeset.clone(); modifiedFiles = addedFiles = null; deletedFiles = null; parent1 = parent2 = null; // keep references to parentHelper, statusHelper and pathHelper } /*package-local*/ void setParentHelper(HgChangelog.ParentWalker pw) { parentHelper = pw; if (parentHelper != null) { if (parentHelper.getRepo() != statusHelper.getRepo()) { throw new IllegalArgumentException(); } } } public int getRevision() { return revNumber; } public Nodeid getNodeid() { return nodeid; } public String getUser() { return changeset.user(); } public String getComment() { return changeset.comment(); } public String getBranch() { return changeset.branch(); } /** * @return used to be String, now {@link HgDate}, use {@link HgDate#toString()} to get same result as before */ public HgDate getDate() { return new HgDate(changeset.date().getTime(), changeset.timezone()); } public Nodeid getManifestRevision() { return changeset.manifest(); } public List<Path> getAffectedFiles() { // reports files as recorded in changelog. Note, merge revisions may have no // files listed, and thus this method would return empty list, while // #getModifiedFiles() would return list with merged file(s) (because it uses status to get 'em, not // what #files() gives). ArrayList<Path> rv = new ArrayList<Path>(changeset.files().size()); for (String name : changeset.files()) { rv.add(pathHelper.path(name)); } return rv; } public List<HgFileRevision> getModifiedFiles() { if (modifiedFiles == null) { initFileChanges(); } return modifiedFiles; } public List<HgFileRevision> getAddedFiles() { if (addedFiles == null) { initFileChanges(); } return addedFiles; } public List<Path> getRemovedFiles() { if (deletedFiles == null) { initFileChanges(); } return deletedFiles; } public boolean isMerge() { // p1 == -1 and p2 != -1 is legitimate case return !(getFirstParentRevision().isNull() || getSecondParentRevision().isNull()); } /** * @return never <code>null</code> */ public Nodeid getFirstParentRevision() { if (parentHelper != null) { return parentHelper.safeFirstParent(nodeid); } // read once for both p1 and p2 if (parent1 == null) { parent1 = new byte[20]; parent2 = new byte[20]; statusHelper.getRepo().getChangelog().parents(revNumber, new int[2], parent1, parent2); } return Nodeid.fromBinary(parent1, 0); } /** * @return never <code>null</code> */ public Nodeid getSecondParentRevision() { if (parentHelper != null) { return parentHelper.safeSecondParent(nodeid); } if (parent2 == null) { parent1 = new byte[20]; parent2 = new byte[20]; statusHelper.getRepo().getChangelog().parents(revNumber, new int[2], parent1, parent2); } return Nodeid.fromBinary(parent2, 0); } @Override public HgChangeset clone() { try { HgChangeset copy = (HgChangeset) super.clone(); // copy.changeset references this.changeset, doesn't need own copy return copy; } catch (CloneNotSupportedException ex) { throw new InternalError(ex.toString()); } } private /*synchronized*/ void initFileChanges() { ArrayList<Path> deleted = new ArrayList<Path>(); ArrayList<HgFileRevision> modified = new ArrayList<HgFileRevision>(); ArrayList<HgFileRevision> added = new ArrayList<HgFileRevision>(); HgStatusCollector.Record r = new HgStatusCollector.Record(); statusHelper.change(revNumber, r); final HgRepository repo = statusHelper.getRepo(); for (Path s : r.getModified()) { Nodeid nid = r.nodeidAfterChange(s); if (nid == null) { throw new HgBadStateException(); } modified.add(new HgFileRevision(repo, nid, s)); } for (Path s : r.getAdded()) { Nodeid nid = r.nodeidAfterChange(s); if (nid == null) { throw new HgBadStateException(); } added.add(new HgFileRevision(repo, nid, s)); } for (Path s : r.getRemoved()) { // with Path from getRemoved, may just copy deleted.add(s); } modified.trimToSize(); added.trimToSize(); deleted.trimToSize(); modifiedFiles = Collections.unmodifiableList(modified); addedFiles = Collections.unmodifiableList(added); deletedFiles = Collections.unmodifiableList(deleted); } }