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annotate src/org/tmatesoft/hg/core/ChangesetTransformer.java @ 200:114c9fe7b643

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Performance optimization: reduce memory ParentWalker hogs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Apr 2011 21:14:51 +0200
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.core;
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18
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19 import java.util.Set;
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20
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21 import org.tmatesoft.hg.repo.HgChangelog;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.repo.HgStatusCollector;
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24 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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25 import org.tmatesoft.hg.util.PathPool;
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26 import org.tmatesoft.hg.util.PathRewrite;
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27
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28 /**
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29 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector {
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35 private final HgLogCommand.Handler handler;
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36 private final HgChangeset changeset;
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37 private Set<String> branches;
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38
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39 // repo and delegate can't be null, parent walker can
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40 public ChangesetTransformer(HgRepository hgRepo, HgLogCommand.Handler delegate, HgChangelog.ParentWalker pw) {
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41 if (hgRepo == null || delegate == null) {
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42 throw new IllegalArgumentException();
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43 }
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44 HgStatusCollector statusCollector = new HgStatusCollector(hgRepo);
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45 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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46 PathPool pp = new PathPool(new PathRewrite.Empty());
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47 statusCollector.setPathPool(pp);
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48 changeset = new HgChangeset(statusCollector, pp);
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49 changeset.setParentHelper(pw);
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50 handler = delegate;
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51 }
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52
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53 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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54 if (branches != null && !branches.contains(cset.branch())) {
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55 return;
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56 }
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58 changeset.init(revisionNumber, nodeid, cset);
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59 handler.next(changeset);
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60 }
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62 public void limitBranches(Set<String> branches) {
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63 this.branches = branches;
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64 }
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65 }