tikhomirov@64: /*
tikhomirov@427: s * Copyright (c) 2011-2012 TMate Software Ltd
tikhomirov@64:  *  
tikhomirov@64:  * This program is free software; you can redistribute it and/or modify
tikhomirov@64:  * it under the terms of the GNU General Public License as published by
tikhomirov@64:  * the Free Software Foundation; version 2 of the License.
tikhomirov@64:  *
tikhomirov@64:  * This program is distributed in the hope that it will be useful,
tikhomirov@64:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@64:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@64:  * GNU General Public License for more details.
tikhomirov@64:  *
tikhomirov@64:  * For information on how to redistribute this software under
tikhomirov@64:  * the terms of a license other than GNU General Public License
tikhomirov@102:  * contact TMate Software at support@hg4j.com
tikhomirov@64:  */
tikhomirov@64: package org.tmatesoft.hg.core;
tikhomirov@64: 
tikhomirov@74: import static org.tmatesoft.hg.repo.HgRepository.TIP;
tikhomirov@456: import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
tikhomirov@64: 
tikhomirov@328: import java.util.ArrayList;
tikhomirov@328: import java.util.Arrays;
tikhomirov@64: import java.util.Calendar;
tikhomirov@328: import java.util.Collection;
tikhomirov@64: import java.util.Collections;
tikhomirov@511: import java.util.Comparator;
tikhomirov@64: import java.util.ConcurrentModificationException;
tikhomirov@510: import java.util.Iterator;
tikhomirov@64: import java.util.LinkedList;
tikhomirov@64: import java.util.List;
tikhomirov@510: import java.util.ListIterator;
tikhomirov@64: import java.util.Set;
tikhomirov@64: import java.util.TreeSet;
tikhomirov@64: 
tikhomirov@328: import org.tmatesoft.hg.internal.IntMap;
tikhomirov@328: import org.tmatesoft.hg.internal.IntVector;
tikhomirov@215: import org.tmatesoft.hg.repo.HgChangelog;
tikhomirov@154: import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
tikhomirov@80: import org.tmatesoft.hg.repo.HgDataFile;
tikhomirov@423: import org.tmatesoft.hg.repo.HgInvalidControlFileException;
tikhomirov@457: import org.tmatesoft.hg.repo.HgInvalidRevisionException;
tikhomirov@423: import org.tmatesoft.hg.repo.HgInvalidStateException;
tikhomirov@456: import org.tmatesoft.hg.repo.HgParentChildMap;
tikhomirov@74: import org.tmatesoft.hg.repo.HgRepository;
tikhomirov@423: import org.tmatesoft.hg.repo.HgRuntimeException;
tikhomirov@328: import org.tmatesoft.hg.repo.HgStatusCollector;
tikhomirov@328: import org.tmatesoft.hg.util.CancelSupport;
tikhomirov@157: import org.tmatesoft.hg.util.CancelledException;
tikhomirov@328: import org.tmatesoft.hg.util.Pair;
tikhomirov@133: import org.tmatesoft.hg.util.Path;
tikhomirov@215: import org.tmatesoft.hg.util.ProgressSupport;
tikhomirov@64: 
tikhomirov@64: 
tikhomirov@64: /**
tikhomirov@131:  * Access to changelog, 'hg log' command counterpart.
tikhomirov@131:  * 
tikhomirov@64:  * <pre>
tikhomirov@131:  * Usage:
tikhomirov@70:  *   new LogCommand().limit(20).branch("maintenance-2.1").user("me").execute(new MyHandler());
tikhomirov@64:  * </pre>
tikhomirov@131:  * Not thread-safe (each thread has to use own {@link HgLogCommand} instance).
tikhomirov@64:  * 
tikhomirov@64:  * @author Artem Tikhomirov
tikhomirov@64:  * @author TMate Software Ltd.
tikhomirov@64:  */
tikhomirov@215: public class HgLogCommand extends HgAbstractCommand<HgLogCommand> implements HgChangelog.Inspector {
tikhomirov@64: 
tikhomirov@64: 	private final HgRepository repo;
tikhomirov@64: 	private Set<String> users;
tikhomirov@64: 	private Set<String> branches;
tikhomirov@64: 	private int limit = 0, count = 0;
tikhomirov@64: 	private int startRev = 0, endRev = TIP;
tikhomirov@64: 	private Calendar date;
tikhomirov@77: 	private Path file;
tikhomirov@80: 	private boolean followHistory; // makes sense only when file != null
tikhomirov@193: 	private ChangesetTransformer csetTransform;
tikhomirov@432: 	private HgParentChildMap<HgChangelog> parentHelper;
tikhomirov@80: 	
tikhomirov@131: 	public HgLogCommand(HgRepository hgRepo) {
tikhomirov@107: 		repo = hgRepo;
tikhomirov@64: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@148: 	 * Limit search to specified user. Multiple user names may be specified. Once set, user names can't be 
tikhomirov@148: 	 * cleared, use new command instance in such cases.
tikhomirov@64: 	 * @param user - full or partial name of the user, case-insensitive, non-null.
tikhomirov@64: 	 * @return <code>this</code> instance for convenience
tikhomirov@148: 	 * @throws IllegalArgumentException when argument is null
tikhomirov@64: 	 */
tikhomirov@131: 	public HgLogCommand user(String user) {
tikhomirov@64: 		if (user == null) {
tikhomirov@64: 			throw new IllegalArgumentException();
tikhomirov@64: 		}
tikhomirov@64: 		if (users == null) {
tikhomirov@64: 			users = new TreeSet<String>();
tikhomirov@64: 		}
tikhomirov@64: 		users.add(user.toLowerCase());
tikhomirov@64: 		return this;
tikhomirov@64: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@64: 	 * Limit search to specified branch. Multiple branch specification possible (changeset from any of these 
tikhomirov@148: 	 * would be included in result). If unspecified, all branches are considered. There's no way to clean branch selection 
tikhomirov@148: 	 * once set, create fresh new command instead.
tikhomirov@64: 	 * @param branch - branch name, case-sensitive, non-null.
tikhomirov@64: 	 * @return <code>this</code> instance for convenience
tikhomirov@148: 	 * @throws IllegalArgumentException when branch argument is null
tikhomirov@64: 	 */
tikhomirov@131: 	public HgLogCommand branch(String branch) {
tikhomirov@64: 		if (branch == null) {
tikhomirov@64: 			throw new IllegalArgumentException();
tikhomirov@64: 		}
tikhomirov@64: 		if (branches == null) {
tikhomirov@64: 			branches = new TreeSet<String>();
tikhomirov@64: 		}
tikhomirov@64: 		branches.add(branch);
tikhomirov@64: 		return this;
tikhomirov@64: 	}
tikhomirov@64: 	
tikhomirov@64: 	// limit search to specific date
tikhomirov@64: 	// multiple?
tikhomirov@131: 	public HgLogCommand date(Calendar date) {
tikhomirov@64: 		this.date = date;
tikhomirov@418: 		// TODO post-1.0 implement
tikhomirov@64: 		// isSet(field) - false => don't use in detection of 'same date'
tikhomirov@64: 		throw HgRepository.notImplemented();
tikhomirov@64: 	}
tikhomirov@64: 	
tikhomirov@64: 	/**
tikhomirov@64: 	 * 
tikhomirov@64: 	 * @param num - number of changeset to produce. Pass 0 to clear the limit. 
tikhomirov@64: 	 * @return <code>this</code> instance for convenience
tikhomirov@64: 	 */
tikhomirov@131: 	public HgLogCommand limit(int num) {
tikhomirov@64: 		limit = num;
tikhomirov@64: 		return this;
tikhomirov@64: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@64: 	 * Limit to specified subset of Changelog, [min(rev1,rev2), max(rev1,rev2)], inclusive.
tikhomirov@64: 	 * Revision may be specified with {@link HgRepository#TIP}  
tikhomirov@427: 	 * 
tikhomirov@427: 	 * @param rev1 - local index of start changeset revision
tikhomirov@427: 	 * @param rev2 - index of end changeset revision
tikhomirov@64: 	 * @return <code>this</code> instance for convenience
tikhomirov@64: 	 */
tikhomirov@131: 	public HgLogCommand range(int rev1, int rev2) {
tikhomirov@64: 		if (rev1 != TIP && rev2 != TIP) {
tikhomirov@64: 			startRev = rev2 < rev1 ? rev2 : rev1;
tikhomirov@64: 			endRev = startRev == rev2 ? rev1 : rev2;
tikhomirov@64: 		} else if (rev1 == TIP && rev2 != TIP) {
tikhomirov@64: 			startRev = rev2;
tikhomirov@64: 			endRev = rev1;
tikhomirov@64: 		} else {
tikhomirov@64: 			startRev = rev1;
tikhomirov@64: 			endRev = rev2;
tikhomirov@64: 		}
tikhomirov@64: 		return this;
tikhomirov@64: 	}
tikhomirov@64: 	
tikhomirov@77: 	/**
tikhomirov@253: 	 * Select specific changeset
tikhomirov@253: 	 * 
tikhomirov@253: 	 * @param nid changeset revision
tikhomirov@253: 	 * @return <code>this</code> for convenience
tikhomirov@427: 	 * @throws HgBadArgumentException if failed to find supplied changeset revision 
tikhomirov@253: 	 */
tikhomirov@427: 	public HgLogCommand changeset(Nodeid nid) throws HgBadArgumentException {
tikhomirov@253: 		// XXX perhaps, shall support multiple (...) arguments and extend #execute to handle not only range, but also set of revisions.
tikhomirov@427: 		try {
tikhomirov@427: 			final int csetRevIndex = repo.getChangelog().getRevisionIndex(nid);
tikhomirov@427: 			return range(csetRevIndex, csetRevIndex);
tikhomirov@457: 		} catch (HgInvalidRevisionException ex) {
tikhomirov@427: 			throw new HgBadArgumentException("Can't find revision", ex).setRevision(nid);
tikhomirov@427: 		}
tikhomirov@253: 	}
tikhomirov@253: 	
tikhomirov@253: 	/**
tikhomirov@77: 	 * Visit history of a given file only.
tikhomirov@77: 	 * @param file path relative to repository root. Pass <code>null</code> to reset.
tikhomirov@80: 	 * @param followCopyRename true to report changesets of the original file(-s), if copy/rename ever occured to the file. 
tikhomirov@77: 	 */
tikhomirov@131: 	public HgLogCommand file(Path file, boolean followCopyRename) {
tikhomirov@77: 		// multiple? Bad idea, would need to include extra method into Handler to tell start of next file
tikhomirov@77: 		this.file = file;
tikhomirov@80: 		followHistory = followCopyRename;
tikhomirov@77: 		return this;
tikhomirov@64: 	}
tikhomirov@142: 	
tikhomirov@142: 	/**
tikhomirov@142: 	 * Handy analog of {@link #file(Path, boolean)} when clients' paths come from filesystem and need conversion to repository's 
tikhomirov@142: 	 */
tikhomirov@142: 	public HgLogCommand file(String file, boolean followCopyRename) {
tikhomirov@142: 		return file(Path.create(repo.getToRepoPathHelper().rewrite(file)), followCopyRename);
tikhomirov@142: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@419: 	 * Similar to {@link #execute(HgChangesetHandler)}, collects and return result as a list.
tikhomirov@427: 	 * 
tikhomirov@427: 	 * @see #execute(HgChangesetHandler)
tikhomirov@427: 	 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
tikhomirov@64: 	 */
tikhomirov@396: 	public List<HgChangeset> execute() throws HgException {
tikhomirov@64: 		CollectHandler collector = new CollectHandler();
tikhomirov@215: 		try {
tikhomirov@215: 			execute(collector);
tikhomirov@423: 		} catch (HgCallbackTargetException ex) {
tikhomirov@423: 			// see below for CanceledException
tikhomirov@423: 			HgInvalidStateException t = new HgInvalidStateException("Internal error");
tikhomirov@423: 			t.initCause(ex);
tikhomirov@423: 			throw t;
tikhomirov@396: 		} catch (CancelledException ex) {
tikhomirov@215: 			// can't happen as long as our CollectHandler doesn't throw any exception
tikhomirov@423: 			HgInvalidStateException t = new HgInvalidStateException("Internal error");
tikhomirov@423: 			t.initCause(ex);
tikhomirov@423: 			throw t;
tikhomirov@215: 		}
tikhomirov@64: 		return collector.getChanges();
tikhomirov@64: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@402: 	 * Iterate over range of changesets configured in the command.
tikhomirov@64: 	 * 
tikhomirov@205: 	 * @param handler callback to process changesets.
tikhomirov@427:  	 * @throws HgCallbackTargetException propagated exception from the handler
tikhomirov@427: 	 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
tikhomirov@380: 	 * @throws CancelledException if execution of the command was cancelled
tikhomirov@64: 	 * @throws IllegalArgumentException when inspector argument is null
tikhomirov@64: 	 * @throws ConcurrentModificationException if this log command instance is already running
tikhomirov@64: 	 */
tikhomirov@370: 	public void execute(HgChangesetHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
tikhomirov@64: 		if (handler == null) {
tikhomirov@64: 			throw new IllegalArgumentException();
tikhomirov@64: 		}
tikhomirov@193: 		if (csetTransform != null) {
tikhomirov@64: 			throw new ConcurrentModificationException();
tikhomirov@64: 		}
tikhomirov@215: 		final ProgressSupport progressHelper = getProgressSupport(handler);
tikhomirov@64: 		try {
tikhomirov@64: 			count = 0;
tikhomirov@432: 			HgParentChildMap<HgChangelog> pw = getParentHelper(file == null); // leave it uninitialized unless we iterate whole repo
tikhomirov@193: 			// ChangesetTransfrom creates a blank PathPool, and #file(String, boolean) above 
tikhomirov@193: 			// may utilize it as well. CommandContext? How about StatusCollector there as well?
tikhomirov@322: 			csetTransform = new ChangesetTransformer(repo, handler, pw, progressHelper, getCancelSupport(handler, true));
tikhomirov@77: 			if (file == null) {
tikhomirov@215: 				progressHelper.start(endRev - startRev + 1);
tikhomirov@77: 				repo.getChangelog().range(startRev, endRev, this);
tikhomirov@215: 				csetTransform.checkFailure();
tikhomirov@77: 			} else {
tikhomirov@215: 				progressHelper.start(-1/*XXX enum const, or a dedicated method startUnspecified(). How about startAtLeast(int)?*/);
tikhomirov@80: 				HgDataFile fileNode = repo.getFileNode(file);
tikhomirov@427: 				if (!fileNode.exists()) {
tikhomirov@427: 					throw new HgPathNotFoundException(String.format("File %s not found in the repository", file), file);
tikhomirov@427: 				}
tikhomirov@509: 				// FIXME startRev and endRev ARE CHANGESET REVISIONS, not that of FILE!!!
tikhomirov@80: 				fileNode.history(startRev, endRev, this);
tikhomirov@215: 				csetTransform.checkFailure();
tikhomirov@126: 				if (fileNode.isCopy()) {
tikhomirov@80: 					// even if we do not follow history, report file rename
tikhomirov@80: 					do {
tikhomirov@427: 						if (handler instanceof HgChangesetHandler.WithCopyHistory) {
tikhomirov@415: 							HgFileRevision src = new HgFileRevision(repo, fileNode.getCopySourceRevision(), null, fileNode.getCopySourceName());
tikhomirov@415: 							HgFileRevision dst = new HgFileRevision(repo, fileNode.getRevision(0), null, fileNode.getPath(), src.getPath());
tikhomirov@427: 							((HgChangesetHandler.WithCopyHistory) handler).copy(src, dst);
tikhomirov@126: 						}
tikhomirov@80: 						if (limit > 0 && count >= limit) {
tikhomirov@80: 							// if limit reach, follow is useless.
tikhomirov@80: 							break;
tikhomirov@80: 						}
tikhomirov@80: 						if (followHistory) {
tikhomirov@126: 							fileNode = repo.getFileNode(fileNode.getCopySourceName());
tikhomirov@80: 							fileNode.history(this);
tikhomirov@215: 							csetTransform.checkFailure();
tikhomirov@80: 						}
tikhomirov@80: 					} while (followHistory && fileNode.isCopy());
tikhomirov@80: 				}
tikhomirov@77: 			}
tikhomirov@427: 		} catch (HgRuntimeException ex) {
tikhomirov@427: 			throw new HgLibraryFailureException(ex);
tikhomirov@64: 		} finally {
tikhomirov@193: 			csetTransform = null;
tikhomirov@215: 			progressHelper.done();
tikhomirov@64: 		}
tikhomirov@64: 	}
tikhomirov@328: 	
tikhomirov@370: 	/**
tikhomirov@402: 	 * Tree-wise iteration of a file history, with handy access to parent-child relations between changesets. 
tikhomirov@402: 	 *  
tikhomirov@402: 	 * @param handler callback to process changesets.
tikhomirov@427:  	 * @throws HgCallbackTargetException propagated exception from the handler
tikhomirov@427: 	 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
tikhomirov@380: 	 * @throws CancelledException if execution of the command was cancelled
tikhomirov@402: 	 * @throws IllegalArgumentException if command is not satisfied with its arguments 
tikhomirov@402: 	 * @throws ConcurrentModificationException if this log command instance is already running
tikhomirov@370: 	 */
tikhomirov@370: 	public void execute(HgChangesetTreeHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
tikhomirov@328: 		if (handler == null) {
tikhomirov@328: 			throw new IllegalArgumentException();
tikhomirov@328: 		}
tikhomirov@328: 		if (csetTransform != null) {
tikhomirov@328: 			throw new ConcurrentModificationException();
tikhomirov@328: 		}
tikhomirov@328: 		if (file == null) {
tikhomirov@328: 			throw new IllegalArgumentException("History tree is supported for files only (at least now), please specify file");
tikhomirov@328: 		}
tikhomirov@328: 		final ProgressSupport progressHelper = getProgressSupport(handler);
tikhomirov@328: 		final CancelSupport cancelHelper = getCancelSupport(handler, true);
tikhomirov@507: 
tikhomirov@508: 		// builds tree of nodes according to parents in file's revlog
tikhomirov@508: 		final TreeBuildInspector treeBuildInspector = new TreeBuildInspector(followHistory);
tikhomirov@509: 		// we iterate separate histories of each filename, need to connect
tikhomirov@509: 		// last node of historyA with first node of historyB (A renamed to B case)
tikhomirov@509: 		// to make overall history smooth.
tikhomirov@509: 		HistoryNode lastFromPrevIteration = null;
tikhomirov@509: 		
tikhomirov@509: 		final int CACHE_CSET_IN_ADVANCE_THRESHOLD = 100; /* XXX is it really worth it? */
tikhomirov@509: 		ElementImpl ei = null;
tikhomirov@508: 
tikhomirov@510: 		// renamed files in the queue are placed with respect to #iterateDirection
tikhomirov@510: 		// i.e. if we iterate from new to old, recent filenames come first
tikhomirov@508: 		LinkedList<Pair<HgDataFile, Nodeid>> fileRenamesQueue = buildFileRenamesQueue();
tikhomirov@507: 		progressHelper.start(4 * fileRenamesQueue.size());
tikhomirov@507: 		do {
tikhomirov@510:  
tikhomirov@510: 			Pair<HgDataFile, Nodeid> renameInfo = fileRenamesQueue.removeFirst();
tikhomirov@507: 			cancelHelper.checkCancelled();
tikhomirov@508: 			HgDataFile fileNode = renameInfo.first();
tikhomirov@508: 			Nodeid fileLastRevToVisit = null;
tikhomirov@508: 			if (followHistory) {
tikhomirov@508: 				fileLastRevToVisit = renameInfo.second();
tikhomirov@508: 				if (fileLastRevToVisit == null) {
tikhomirov@510: 					// it's either first or last item in the queue, depending on iteration order
tikhomirov@510: 					assert fileRenamesQueue.isEmpty() || /*awful way to find out it's first iteration*/ lastFromPrevIteration == null;
tikhomirov@508: 					// TODO subject to dedicated method either in HgRepository (getWorkingCopyParentRevisionIndex)
tikhomirov@508: 					// or in the HgDataFile (getWorkingCopyOriginRevision)
tikhomirov@508: 					Nodeid wdParentChangeset = repo.getWorkingCopyParents().first();
tikhomirov@508: 					if (!wdParentChangeset.isNull()) {
tikhomirov@508: 						int wdParentRevIndex = repo.getChangelog().getRevisionIndex(wdParentChangeset);
tikhomirov@508: 						fileLastRevToVisit = repo.getManifest().getFileRevision(wdParentRevIndex, fileNode.getPath());
tikhomirov@508: 					}
tikhomirov@508: 					// else fall-through, assume lastRevision() is ok here
tikhomirov@508: 				}
tikhomirov@508: 			}
tikhomirov@508: 			int fileLastRevIndexToVisit = fileLastRevToVisit == null ? fileNode.getLastRevision() : fileNode.getRevisionIndex(fileLastRevToVisit);
tikhomirov@509: 			final List<HistoryNode> changeHistory = treeBuildInspector.go(fileNode, fileLastRevIndexToVisit);
tikhomirov@509: 			assert changeHistory.size() > 0;
tikhomirov@328: 			progressHelper.worked(1);
tikhomirov@423: 			cancelHelper.checkCancelled();
tikhomirov@507: 			final ProgressSupport ph2;
tikhomirov@509: 			if (ei == null) {
tikhomirov@509: 				// when follow is true, changeHistory.size() of the first revision might be quite short 
tikhomirov@509: 				// (e.g. bad fname recognized soon), hence ensure at least cache size at once
tikhomirov@509: 				ei = new ElementImpl(Math.max(CACHE_CSET_IN_ADVANCE_THRESHOLD, changeHistory.size()));
tikhomirov@509: 			}
tikhomirov@509: 			if (changeHistory.size() < CACHE_CSET_IN_ADVANCE_THRESHOLD ) {
tikhomirov@509: 				int[] commitRevisions = treeBuildInspector.getCommitRevisions();
tikhomirov@509: 				assert changeHistory.size() == commitRevisions.length;
tikhomirov@508: 				// read bunch of changesets at once and cache 'em
tikhomirov@507: 				ei.initTransform();
tikhomirov@508: 				repo.getChangelog().range(ei, commitRevisions);
tikhomirov@507: 				progressHelper.worked(1);
tikhomirov@507: 				ph2 = new ProgressSupport.Sub(progressHelper, 2);
tikhomirov@507: 			} else {
tikhomirov@507: 				ph2 = new ProgressSupport.Sub(progressHelper, 3);
tikhomirov@507: 			}
tikhomirov@509: 			ph2.start(changeHistory.size());
tikhomirov@509: 			if (lastFromPrevIteration != null) {
tikhomirov@510: 				if (iterateDirection == IterateDirection.FromOldToNew) {
tikhomirov@510: 					// forward, from old to new:
tikhomirov@510: 					// A(0..n) -> B(0..m). First, report A(0)..A(n-1)
tikhomirov@510: 					// then A(n).bind(B(0))
tikhomirov@510: 					HistoryNode oldestOfTheNextChunk = changeHistory.get(0);
tikhomirov@510: 					lastFromPrevIteration.bindChild(oldestOfTheNextChunk);
tikhomirov@510: 					changeHistory.add(0, lastFromPrevIteration);
tikhomirov@510: 				} else {
tikhomirov@510: 					assert iterateDirection == IterateDirection.FromNewToOld;
tikhomirov@510: 					// A renamed to B. A(0..n) -> B(0..m). 
tikhomirov@510: 					// First, report B(m), B(m-1)...B(1), then A(n).bind(B(0))
tikhomirov@510: 					HistoryNode newestOfNextChunk = changeHistory.get(changeHistory.size() - 1); // A(n)
tikhomirov@510: 					newestOfNextChunk.bindChild(lastFromPrevIteration);
tikhomirov@510: 					changeHistory.add(lastFromPrevIteration);
tikhomirov@510: 				}
tikhomirov@509: 			}
tikhomirov@509: 			if (!fileRenamesQueue.isEmpty()) {
tikhomirov@510: 				if (iterateDirection == IterateDirection.FromOldToNew) {
tikhomirov@510: 					// save newest, and exclude it from this iteration (postpone for next)
tikhomirov@510: 					lastFromPrevIteration = changeHistory.remove(changeHistory.size()-1);
tikhomirov@510: 				} else {
tikhomirov@510: 					assert iterateDirection == IterateDirection.FromNewToOld;
tikhomirov@510: 					// save oldest, and exclude it from thi iteration (postpone for next)
tikhomirov@510: 					lastFromPrevIteration = changeHistory.remove(0);
tikhomirov@510: 				}
tikhomirov@509: 			} else {
tikhomirov@509: 				lastFromPrevIteration = null; // just for the sake of no references to old items 
tikhomirov@509: 			}
tikhomirov@509: 			// XXX shall sort changeHistory according to changeset numbers?
tikhomirov@510: 			Iterator<HistoryNode> it;
tikhomirov@510: 			if (iterateDirection == IterateDirection.FromOldToNew) {
tikhomirov@510: 				it = changeHistory.listIterator();
tikhomirov@510: 			} else {
tikhomirov@510: 				assert iterateDirection == IterateDirection.FromNewToOld;
tikhomirov@510: 				it = new ReverseIterator<HistoryNode>(changeHistory);
tikhomirov@510: 			}
tikhomirov@510: 			while(it.hasNext()) {
tikhomirov@510: 				HistoryNode n = it.next();
tikhomirov@507: 				handler.treeElement(ei.init(n));
tikhomirov@507: 				ph2.worked(1);
tikhomirov@507: 				cancelHelper.checkCancelled();
tikhomirov@507: 			}
tikhomirov@507: 		} while (!fileRenamesQueue.isEmpty());
tikhomirov@328: 		progressHelper.done();
tikhomirov@328: 	}
tikhomirov@328: 	
tikhomirov@510: 	private IterateDirection iterateDirection = IterateDirection.FromOldToNew;
tikhomirov@510: 
tikhomirov@510: 	private static class ReverseIterator<E> implements Iterator<E> {
tikhomirov@510: 		private final ListIterator<E> listIterator;
tikhomirov@510: 		
tikhomirov@510: 		public ReverseIterator(List<E> list) {
tikhomirov@510: 			listIterator = list.listIterator(list.size());
tikhomirov@510: 		}
tikhomirov@510: 
tikhomirov@510: 		public boolean hasNext() {
tikhomirov@510: 			return listIterator.hasPrevious();
tikhomirov@510: 		}
tikhomirov@510: 		public E next() {
tikhomirov@510: 			return listIterator.previous();
tikhomirov@510: 		}
tikhomirov@510: 		public void remove() {
tikhomirov@510: 			listIterator.remove();
tikhomirov@510: 		}
tikhomirov@510: 	}
tikhomirov@510: 
tikhomirov@507: 	/**
tikhomirov@508: 	 * Follows file renames and build a list of all corresponding file nodes and revisions they were 
tikhomirov@508: 	 * copied/renamed/branched at (IOW, their latest revision to look at).
tikhomirov@508: 	 *  
tikhomirov@508: 	 * If {@link #followHistory} is <code>false</code>, the list contains one element only, 
tikhomirov@508: 	 * file node with the name of the file as it was specified by the user.
tikhomirov@508: 	 * 
tikhomirov@508: 	 * For the most recent file revision is null.
tikhomirov@508: 	 * 
tikhomirov@508: 	 * TODO may use HgFileRevision (after some refactoring to accept HgDataFile and Nodeid) instead of Pair
tikhomirov@508: 	 * and possibly reuse this functionality
tikhomirov@507: 	 * 
tikhomirov@510: 	 * @return list of file renames, ordered with respect to {@link #iterateDirection}
tikhomirov@507: 	 */
tikhomirov@508: 	private LinkedList<Pair<HgDataFile, Nodeid>> buildFileRenamesQueue() {
tikhomirov@508: 		LinkedList<Pair<HgDataFile, Nodeid>> rv = new LinkedList<Pair<HgDataFile, Nodeid>>();
tikhomirov@507: 		if (!followHistory) {
tikhomirov@508: 			rv.add(new Pair<HgDataFile, Nodeid>(repo.getFileNode(file), null));
tikhomirov@507: 			return rv;
tikhomirov@507: 		}
tikhomirov@507: 		Path fp = file;
tikhomirov@508: 		Nodeid copyRev = null;
tikhomirov@507: 		boolean isCopy;
tikhomirov@507: 		do {
tikhomirov@508: 			HgDataFile fileNode = repo.getFileNode(fp);
tikhomirov@510: 			Pair<HgDataFile, Nodeid> p = new Pair<HgDataFile, Nodeid>(fileNode, copyRev);
tikhomirov@510: 			if (iterateDirection == IterateDirection.FromOldToNew) {
tikhomirov@510: 				rv.addFirst(p);
tikhomirov@510: 			} else {
tikhomirov@510: 				assert iterateDirection == IterateDirection.FromNewToOld;
tikhomirov@510: 				rv.addLast(p);
tikhomirov@510: 			}
tikhomirov@507: 			if (isCopy = fileNode.isCopy()) {
tikhomirov@507: 				fp = fileNode.getCopySourceName();
tikhomirov@508: 				copyRev = fileNode.getCopySourceRevision();
tikhomirov@507: 			}
tikhomirov@507: 		} while (isCopy);
tikhomirov@507: 		return rv;
tikhomirov@507: 	}
tikhomirov@508: 	
tikhomirov@508: 	private static class TreeBuildInspector implements HgChangelog.ParentInspector, HgChangelog.RevisionInspector {
tikhomirov@508: 		private final boolean followAncestry;
tikhomirov@508: 
tikhomirov@508: 		private HistoryNode[] completeHistory;
tikhomirov@508: 		private int[] commitRevisions;
tikhomirov@509: 		private List<HistoryNode> resultHistory;
tikhomirov@508: 		
tikhomirov@508: 		TreeBuildInspector(boolean _followAncestry) {
tikhomirov@508: 			followAncestry = _followAncestry;
tikhomirov@508: 		}
tikhomirov@508: 
tikhomirov@508: 		public void next(int revisionNumber, Nodeid revision, int linkedRevision) {
tikhomirov@508: 			commitRevisions[revisionNumber] = linkedRevision;
tikhomirov@508: 		}
tikhomirov@508: 
tikhomirov@508: 		public void next(int revisionNumber, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2) {
tikhomirov@508: 			HistoryNode p1 = null, p2 = null;
tikhomirov@508: 			if (parent1 != -1) {
tikhomirov@508: 				p1 = completeHistory[parent1];
tikhomirov@508: 			}
tikhomirov@508: 			if (parent2!= -1) {
tikhomirov@508: 				p2 = completeHistory[parent2];
tikhomirov@508: 			}
tikhomirov@508: 			completeHistory[revisionNumber] = new HistoryNode(commitRevisions[revisionNumber], revision, p1, p2);
tikhomirov@508: 		}
tikhomirov@508: 		
tikhomirov@508: 		/**
tikhomirov@508: 		 * Builds history of file changes (in natural order, from oldest to newest) up to (and including) file revision specified.
tikhomirov@508: 		 * If {@link TreeBuildInspector} follows ancestry, only elements that are on the line of ancestry of the revision at 
tikhomirov@508: 		 * lastRevisionIndex would be included.
tikhomirov@509: 		 * 
tikhomirov@509: 		 * @return list of history elements, from oldest to newest. In case {@link #followAncestry} is <code>true</code>, the list
tikhomirov@509: 		 * is modifiable (to further augment with last/first elements of renamed file histories)
tikhomirov@508: 		 */
tikhomirov@509: 		List<HistoryNode> go(HgDataFile fileNode, int lastRevisionIndex) throws HgInvalidControlFileException {
tikhomirov@509: 			resultHistory = null;
tikhomirov@508: 			completeHistory = new HistoryNode[lastRevisionIndex+1];
tikhomirov@508: 			commitRevisions = new int[completeHistory.length];
tikhomirov@508: 			fileNode.indexWalk(0, lastRevisionIndex, this);
tikhomirov@508: 			if (!followAncestry) {
tikhomirov@509: 				// in case when ancestor not followed, it's safe to return unmodifiable list
tikhomirov@509: 				resultHistory = Arrays.asList(completeHistory);
tikhomirov@509: 				completeHistory = null;
tikhomirov@509: 				// keep commitRevisions initialized, no need to recalculate them
tikhomirov@509: 				// as they correspond 1:1 to resultHistory
tikhomirov@509: 				return resultHistory;
tikhomirov@508: 			}
tikhomirov@508: 			/*
tikhomirov@509: 			 * Changesets, newest at the top:
tikhomirov@508: 			 * o              <-- cset from working dir parent (as in dirstate), file not changed (file revision recorded points to that from A)  
tikhomirov@508: 			 * |   x          <-- revision with file changed (B')
tikhomirov@508: 			 * x  /           <-- revision with file changed (A)
tikhomirov@508: 			 * | x            <-- revision with file changed (B)
tikhomirov@508: 			 * |/
tikhomirov@508: 			 * o              <-- another changeset, where file wasn't changed
tikhomirov@508: 			 * |
tikhomirov@508: 			 * x              <-- revision with file changed (C)
tikhomirov@508: 			 * 
tikhomirov@508: 			 * File history: B', A, B, C
tikhomirov@508: 			 * 
tikhomirov@508: 			 * When "follow", SHALL NOT report B and B', but A and C
tikhomirov@508: 			 */
tikhomirov@508: 			// strippedHistory: only those HistoryNodes from completeHistory that are on the same
tikhomirov@508: 			// line of descendant, in order from older to newer
tikhomirov@508: 			LinkedList<HistoryNode> strippedHistoryList = new LinkedList<HistoryNode>();
tikhomirov@508: 			LinkedList<HistoryNode> queue = new LinkedList<HistoryNode>();
tikhomirov@508: 			// look for ancestors of the selected history node
tikhomirov@508: 			queue.add(completeHistory[lastRevisionIndex]);
tikhomirov@508: 			do {
tikhomirov@508: 				HistoryNode withFileChange = queue.removeFirst();
tikhomirov@511: 				if (strippedHistoryList.contains(withFileChange)) {
tikhomirov@511: 					// fork  point for the change that was later merged (and we traced
tikhomirov@511: 					// both lines of development by now.
tikhomirov@511: 					continue;
tikhomirov@511: 				}
tikhomirov@508: 				if (withFileChange.children != null) {
tikhomirov@508: 					withFileChange.children.retainAll(strippedHistoryList);
tikhomirov@508: 				}
tikhomirov@508: 				strippedHistoryList.addFirst(withFileChange);
tikhomirov@508: 				if (withFileChange.parent1 != null) {
tikhomirov@508: 					queue.addLast(withFileChange.parent1);
tikhomirov@508: 				}
tikhomirov@508: 				if (withFileChange.parent2 != null) {
tikhomirov@508: 					queue.addLast(withFileChange.parent2);
tikhomirov@508: 				}
tikhomirov@508: 			} while (!queue.isEmpty());
tikhomirov@511: 			Collections.sort(strippedHistoryList, new Comparator<HistoryNode>() {
tikhomirov@511: 
tikhomirov@511: 				public int compare(HistoryNode o1, HistoryNode o2) {
tikhomirov@511: 					return o1.changeset - o2.changeset;
tikhomirov@511: 				}
tikhomirov@511: 			});
tikhomirov@508: 			completeHistory = null;
tikhomirov@508: 			commitRevisions = null;
tikhomirov@508: 			// collected values are no longer valid - shall 
tikhomirov@508: 			// strip off elements for missing HistoryNodes, but it's easier just to re-create the array
tikhomirov@509: 			// from resultHistory later, once (and if) needed
tikhomirov@509: 			return resultHistory = strippedHistoryList;
tikhomirov@508: 		}
tikhomirov@508: 		
tikhomirov@508: 		/**
tikhomirov@508: 		 * handy access to all HistoryNode[i].changeset values
tikhomirov@508: 		 */
tikhomirov@508: 		int[] getCommitRevisions() {
tikhomirov@509: 			if (commitRevisions == null) {
tikhomirov@509: 				commitRevisions = new int[resultHistory.size()];
tikhomirov@509: 				int i = 0;
tikhomirov@509: 				for (HistoryNode n : resultHistory) {
tikhomirov@509: 					commitRevisions[i++] = n.changeset;
tikhomirov@509: 				}
tikhomirov@509: 			}
tikhomirov@508: 			return commitRevisions;
tikhomirov@508: 		}
tikhomirov@508: 	};
tikhomirov@508: 
tikhomirov@507: 
tikhomirov@64: 	//
tikhomirov@64: 	
tikhomirov@154: 	public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
tikhomirov@64: 		if (limit > 0 && count >= limit) {
tikhomirov@64: 			return;
tikhomirov@64: 		}
tikhomirov@64: 		if (branches != null && !branches.contains(cset.branch())) {
tikhomirov@64: 			return;
tikhomirov@64: 		}
tikhomirov@64: 		if (users != null) {
tikhomirov@64: 			String csetUser = cset.user().toLowerCase();
tikhomirov@64: 			boolean found = false;
tikhomirov@64: 			for (String u : users) {
tikhomirov@64: 				if (csetUser.indexOf(u) != -1) {
tikhomirov@64: 					found = true;
tikhomirov@64: 					break;
tikhomirov@64: 				}
tikhomirov@64: 			}
tikhomirov@64: 			if (!found) {
tikhomirov@64: 				return;
tikhomirov@64: 			}
tikhomirov@64: 		}
tikhomirov@64: 		if (date != null) {
tikhomirov@418: 			// TODO post-1.0 implement date support for log
tikhomirov@64: 		}
tikhomirov@64: 		count++;
tikhomirov@193: 		csetTransform.next(revisionNumber, nodeid, cset);
tikhomirov@64: 	}
tikhomirov@195: 	
tikhomirov@432: 	private HgParentChildMap<HgChangelog> getParentHelper(boolean create) throws HgInvalidControlFileException {
tikhomirov@328: 		if (parentHelper == null && create) {
tikhomirov@432: 			parentHelper = new HgParentChildMap<HgChangelog>(repo.getChangelog());
tikhomirov@195: 			parentHelper.init();
tikhomirov@195: 		}
tikhomirov@195: 		return parentHelper;
tikhomirov@195: 	}
tikhomirov@195: 
tikhomirov@64: 
tikhomirov@205: 	public static class CollectHandler implements HgChangesetHandler {
tikhomirov@129: 		private final List<HgChangeset> result = new LinkedList<HgChangeset>();
tikhomirov@64: 
tikhomirov@129: 		public List<HgChangeset> getChanges() {
tikhomirov@64: 			return Collections.unmodifiableList(result);
tikhomirov@64: 		}
tikhomirov@64: 
tikhomirov@427: 		public void cset(HgChangeset changeset) {
tikhomirov@64: 			result.add(changeset.clone());
tikhomirov@64: 		}
tikhomirov@64: 	}
tikhomirov@328: 
tikhomirov@328: 	private static class HistoryNode {
tikhomirov@328: 		final int changeset;
tikhomirov@328: 		final Nodeid fileRevision;
tikhomirov@509: 		HistoryNode parent1; // there's special case when we can alter it, see #bindChild()
tikhomirov@509: 		final HistoryNode parent2;
tikhomirov@328: 		List<HistoryNode> children;
tikhomirov@328: 
tikhomirov@328: 		HistoryNode(int cs, Nodeid revision, HistoryNode p1, HistoryNode p2) {
tikhomirov@328: 			changeset = cs;
tikhomirov@328: 			fileRevision = revision;
tikhomirov@328: 			parent1 = p1;
tikhomirov@328: 			parent2 = p2;
tikhomirov@328: 			if (p1 != null) {
tikhomirov@328: 				p1.addChild(this);
tikhomirov@328: 			}
tikhomirov@328: 			if (p2 != null) {
tikhomirov@328: 				p2.addChild(this);
tikhomirov@328: 			}
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@509: 		private void addChild(HistoryNode child) {
tikhomirov@328: 			if (children == null) {
tikhomirov@328: 				children = new ArrayList<HistoryNode>(2);
tikhomirov@328: 			}
tikhomirov@328: 			children.add(child);
tikhomirov@328: 		}
tikhomirov@509: 		
tikhomirov@509: 		/**
tikhomirov@509: 		 * method to merge two history chunks for renamed file so that
tikhomirov@509: 		 * this node's history continues with that of child
tikhomirov@509: 		 * @param child
tikhomirov@509: 		 */
tikhomirov@509: 		public void bindChild(HistoryNode child) {
tikhomirov@509: 			assert child.parent1 == null && child.parent2 == null;
tikhomirov@509: 			// for the last element in history empty children are by construction:
tikhomirov@509: 			// we don't iterate further than last element of interest in TreeBuildInspector#go
tikhomirov@509: 			assert children == null || children.isEmpty();
tikhomirov@509: 			child.parent1 = this;
tikhomirov@509: 			addChild(child);
tikhomirov@509: 		}
tikhomirov@511: 		
tikhomirov@511: 		public String toString() {
tikhomirov@511: 			return String.format("<cset:%d, parents: %s, %s>", changeset, parent1 == null ? "-" : String.valueOf(parent1.changeset), parent2 == null ? "-" : String.valueOf(parent2.changeset));
tikhomirov@511: 		}
tikhomirov@328: 	}
tikhomirov@328: 
tikhomirov@328: 	private class ElementImpl implements HgChangesetTreeHandler.TreeElement, HgChangelog.Inspector {
tikhomirov@328: 		private HistoryNode historyNode;
tikhomirov@328: 		private Pair<HgChangeset, HgChangeset> parents;
tikhomirov@328: 		private List<HgChangeset> children;
tikhomirov@328: 		private IntMap<HgChangeset> cachedChangesets;
tikhomirov@328: 		private ChangesetTransformer.Transformation transform;
tikhomirov@328: 		private Nodeid changesetRevision;
tikhomirov@328: 		private Pair<Nodeid,Nodeid> parentRevisions;
tikhomirov@328: 		private List<Nodeid> childRevisions;
tikhomirov@328: 		
tikhomirov@328: 		public ElementImpl(int total) {
tikhomirov@328: 			cachedChangesets = new IntMap<HgChangeset>(total);
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@328: 		ElementImpl init(HistoryNode n) {
tikhomirov@328: 			historyNode = n;
tikhomirov@328: 			parents = null;
tikhomirov@328: 			children = null;
tikhomirov@328: 			changesetRevision = null;
tikhomirov@328: 			parentRevisions = null;
tikhomirov@328: 			childRevisions = null;
tikhomirov@328: 			return this;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@328: 		public Nodeid fileRevision() {
tikhomirov@328: 			return historyNode.fileRevision;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public HgChangeset changeset() {
tikhomirov@328: 			return get(historyNode.changeset)[0];
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public Pair<HgChangeset, HgChangeset> parents() {
tikhomirov@328: 			if (parents != null) {
tikhomirov@328: 				return parents;
tikhomirov@328: 			}
tikhomirov@328: 			HistoryNode p;
tikhomirov@328: 			final int p1, p2;
tikhomirov@328: 			if ((p = historyNode.parent1) != null) {
tikhomirov@328: 				p1 = p.changeset;
tikhomirov@328: 			} else {
tikhomirov@328: 				p1 = -1;
tikhomirov@328: 			}
tikhomirov@328: 			if ((p = historyNode.parent2) != null) {
tikhomirov@328: 				p2 = p.changeset;
tikhomirov@328: 			} else {
tikhomirov@328: 				p2 = -1;
tikhomirov@328: 			}
tikhomirov@328: 			HgChangeset[] r = get(p1, p2);
tikhomirov@328: 			return parents = new Pair<HgChangeset, HgChangeset>(r[0], r[1]);
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public Collection<HgChangeset> children() {
tikhomirov@328: 			if (children != null) {
tikhomirov@328: 				return children;
tikhomirov@328: 			}
tikhomirov@328: 			if (historyNode.children == null) {
tikhomirov@328: 				children = Collections.emptyList();
tikhomirov@328: 			} else {
tikhomirov@328: 				int[] childrentChangesetNumbers = new int[historyNode.children.size()];
tikhomirov@328: 				int j = 0;
tikhomirov@328: 				for (HistoryNode hn : historyNode.children) {
tikhomirov@328: 					childrentChangesetNumbers[j++] = hn.changeset;
tikhomirov@328: 				}
tikhomirov@328: 				children = Arrays.asList(get(childrentChangesetNumbers));
tikhomirov@328: 			}
tikhomirov@328: 			return children;
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@328: 		void populate(HgChangeset cs) {
tikhomirov@403: 			cachedChangesets.put(cs.getRevisionIndex(), cs);
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@423: 		private HgChangeset[] get(int... changelogRevisionIndex) {
tikhomirov@403: 			HgChangeset[] rv = new HgChangeset[changelogRevisionIndex.length];
tikhomirov@403: 			IntVector misses = new IntVector(changelogRevisionIndex.length, -1);
tikhomirov@403: 			for (int i = 0; i < changelogRevisionIndex.length; i++) {
tikhomirov@403: 				if (changelogRevisionIndex[i] == -1) {
tikhomirov@328: 					rv[i] = null;
tikhomirov@328: 					continue;
tikhomirov@328: 				}
tikhomirov@403: 				HgChangeset cached = cachedChangesets.get(changelogRevisionIndex[i]);
tikhomirov@328: 				if (cached != null) {
tikhomirov@328: 					rv[i] = cached;
tikhomirov@328: 				} else {
tikhomirov@403: 					misses.add(changelogRevisionIndex[i]);
tikhomirov@328: 				}
tikhomirov@328: 			}
tikhomirov@328: 			if (misses.size() > 0) {
tikhomirov@328: 				final int[] changesets2read = misses.toArray();
tikhomirov@328: 				initTransform();
tikhomirov@328: 				repo.getChangelog().range(this, changesets2read);
tikhomirov@328: 				for (int changeset2read : changesets2read) {
tikhomirov@328: 					HgChangeset cs = cachedChangesets.get(changeset2read);
tikhomirov@403: 					if (cs == null) {
tikhomirov@423: 						HgInvalidStateException t = new HgInvalidStateException(String.format("Can't get changeset for revision %d", changeset2read));
tikhomirov@423: 						throw t.setRevisionIndex(changeset2read);
tikhomirov@403: 					}
tikhomirov@403: 					// HgChangelog.range may reorder changesets according to their order in the changelog
tikhomirov@403: 					// thus need to find original index
tikhomirov@403: 					boolean sanity = false;
tikhomirov@403: 					for (int i = 0; i < changelogRevisionIndex.length; i++) {
tikhomirov@403: 						if (changelogRevisionIndex[i] == cs.getRevisionIndex()) {
tikhomirov@403: 							rv[i] = cs;
tikhomirov@403: 							sanity = true;
tikhomirov@403: 							break;
tikhomirov@328: 						}
tikhomirov@403: 					}
tikhomirov@403: 					if (!sanity) {
tikhomirov@490: 						repo.getSessionContext().getLog().dump(getClass(), Error, "Index of revision %d:%s doesn't match any of requested", cs.getRevisionIndex(), cs.getNodeid().shortNotation());
tikhomirov@403: 					}
tikhomirov@403: 					assert sanity;
tikhomirov@328: 				}
tikhomirov@328: 			}
tikhomirov@328: 			return rv;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@328: 		// init only when needed
tikhomirov@423: 		void initTransform() throws HgRuntimeException {
tikhomirov@328: 			if (transform == null) {
tikhomirov@328: 				transform = new ChangesetTransformer.Transformation(new HgStatusCollector(repo)/*XXX try to reuse from context?*/, getParentHelper(false));
tikhomirov@328: 			}
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@328: 		public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
tikhomirov@328: 			HgChangeset cs = transform.handle(revisionNumber, nodeid, cset);
tikhomirov@328: 			populate(cs.clone());
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public Nodeid changesetRevision() {
tikhomirov@328: 			if (changesetRevision == null) {
tikhomirov@328: 				changesetRevision = getRevision(historyNode.changeset);
tikhomirov@328: 			}
tikhomirov@328: 			return changesetRevision;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public Pair<Nodeid, Nodeid> parentRevisions() {
tikhomirov@328: 			if (parentRevisions == null) {
tikhomirov@328: 				HistoryNode p;
tikhomirov@328: 				final Nodeid p1, p2;
tikhomirov@328: 				if ((p = historyNode.parent1) != null) {
tikhomirov@328: 					p1 = getRevision(p.changeset);
tikhomirov@328: 				} else {
tikhomirov@328: 					p1 = Nodeid.NULL;;
tikhomirov@328: 				}
tikhomirov@328: 				if ((p = historyNode.parent2) != null) {
tikhomirov@328: 					p2 = getRevision(p.changeset);
tikhomirov@328: 				} else {
tikhomirov@328: 					p2 = Nodeid.NULL;
tikhomirov@328: 				}
tikhomirov@328: 				parentRevisions = new Pair<Nodeid, Nodeid>(p1, p2);
tikhomirov@328: 			}
tikhomirov@328: 			return parentRevisions;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@423: 		public Collection<Nodeid> childRevisions() {
tikhomirov@328: 			if (childRevisions != null) {
tikhomirov@328: 				return childRevisions;
tikhomirov@328: 			}
tikhomirov@328: 			if (historyNode.children == null) {
tikhomirov@328: 				childRevisions = Collections.emptyList();
tikhomirov@328: 			} else {
tikhomirov@328: 				ArrayList<Nodeid> rv = new ArrayList<Nodeid>(historyNode.children.size());
tikhomirov@328: 				for (HistoryNode hn : historyNode.children) {
tikhomirov@328: 					rv.add(getRevision(hn.changeset));
tikhomirov@328: 				}
tikhomirov@328: 				childRevisions = Collections.unmodifiableList(rv);
tikhomirov@328: 			}
tikhomirov@328: 			return childRevisions;
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@328: 		// reading nodeid involves reading index only, guess, can afford not to optimize multiple reads
tikhomirov@423: 		private Nodeid getRevision(int changelogRevisionNumber) {
tikhomirov@423: 			// TODO post-1.0 pipe through pool
tikhomirov@328: 			HgChangeset cs = cachedChangesets.get(changelogRevisionNumber);
tikhomirov@328: 			if (cs != null) {
tikhomirov@328: 				return cs.getNodeid();
tikhomirov@328: 			} else {
tikhomirov@403: 				return repo.getChangelog().getRevision(changelogRevisionNumber);
tikhomirov@328: 			}
tikhomirov@328: 		}
tikhomirov@328: 	}
tikhomirov@510: 
tikhomirov@510: 	private enum IterateDirection {
tikhomirov@510: 		FromOldToNew, FromNewToOld
tikhomirov@510: 	}
tikhomirov@64: }