tikhomirov@64: /*
tikhomirov@64:  * Copyright (c) 2011 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@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@64: import java.util.ConcurrentModificationException;
tikhomirov@64: import java.util.LinkedList;
tikhomirov@64: import java.util.List;
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@354: import org.tmatesoft.hg.repo.HgInternals;
tikhomirov@74: import org.tmatesoft.hg.repo.HgRepository;
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@195: 	private HgChangelog.ParentWalker 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@64: 		// FIXME 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@368: 	 * @param rev1 - revision local index
tikhomirov@368: 	 * @param rev2 - revision local index
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@354: 	 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog  
tikhomirov@354: 	 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
tikhomirov@253: 	 */
tikhomirov@354: 	public HgLogCommand changeset(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
tikhomirov@253: 		// XXX perhaps, shall support multiple (...) arguments and extend #execute to handle not only range, but also set of revisions.
tikhomirov@368: 		final int csetRevIndex = repo.getChangelog().getRevisionIndex(nid);
tikhomirov@368: 		return range(csetRevIndex, csetRevIndex);
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@154: 	 * Similar to {@link #execute(org.tmatesoft.hg.repo.RawChangeset.Inspector)}, collects and return result as a list.
tikhomirov@64: 	 */
tikhomirov@215: 	public List<HgChangeset> execute() throws HgDataStreamException {
tikhomirov@64: 		CollectHandler collector = new CollectHandler();
tikhomirov@215: 		try {
tikhomirov@215: 			execute(collector);
tikhomirov@275: 		} catch (HgException ex) {
tikhomirov@215: 			// can't happen as long as our CollectHandler doesn't throw any exception
tikhomirov@215: 			throw new HgBadStateException(ex.getCause());
tikhomirov@215: 		} catch (CancelledException ex) {
tikhomirov@215: 			// can't happen, see above
tikhomirov@215: 			throw new HgBadStateException(ex);
tikhomirov@215: 		}
tikhomirov@64: 		return collector.getChanges();
tikhomirov@64: 	}
tikhomirov@64: 
tikhomirov@64: 	/**
tikhomirov@64: 	 * 
tikhomirov@205: 	 * @param handler callback to process changesets.
tikhomirov@380: 	 * @throws HgCallbackTargetException to re-throw exception from the handler
tikhomirov@383: 	 * @throws HgException FIXME EXCEPTIONS
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@328: 			HgChangelog.ParentWalker 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@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@126: 						if (handler instanceof FileHistoryHandler) {
tikhomirov@231: 							HgFileRevision src = new HgFileRevision(repo, fileNode.getCopySourceRevision(), fileNode.getCopySourceName());
tikhomirov@316: 							HgFileRevision dst = new HgFileRevision(repo, fileNode.getRevision(0), fileNode.getPath(), src.getPath());
tikhomirov@215: 							try {
tikhomirov@215: 								((FileHistoryHandler) handler).copy(src, dst);
tikhomirov@370: 							} catch (HgCallbackTargetException.Wrap ex) {
tikhomirov@215: 								throw new HgCallbackTargetException(ex).setRevision(fileNode.getCopySourceRevision()).setFileName(fileNode.getCopySourceName());
tikhomirov@215: 							}
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@64: 		} finally {
tikhomirov@193: 			csetTransform = null;
tikhomirov@215: 			progressHelper.done();
tikhomirov@64: 		}
tikhomirov@64: 	}
tikhomirov@328: 	
tikhomirov@370: 	/**
tikhomirov@380: 	 * TODO documentation 
tikhomirov@370: 	 * @param handler
tikhomirov@380: 	 * @throws HgCallbackTargetException to re-throw exception from the handler
tikhomirov@383: 	 * @throws HgException FIXME EXCEPTIONS
tikhomirov@380: 	 * @throws CancelledException if execution of the command was cancelled
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: 		if (followHistory) {
tikhomirov@328: 			throw new UnsupportedOperationException("Can't follow file history when building tree (yet?)");
tikhomirov@328: 		}
tikhomirov@328: 		class TreeBuildInspector implements HgChangelog.ParentInspector, HgChangelog.RevisionInspector {
tikhomirov@328: 			HistoryNode[] completeHistory;
tikhomirov@328: 			int[] commitRevisions;
tikhomirov@64: 
tikhomirov@328: 			public void next(int revisionNumber, Nodeid revision, int linkedRevision) {
tikhomirov@328: 				commitRevisions[revisionNumber] = linkedRevision;
tikhomirov@328: 			}
tikhomirov@328: 
tikhomirov@328: 			public void next(int revisionNumber, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2) {
tikhomirov@328: 				HistoryNode p1 = null, p2 = null;
tikhomirov@328: 				if (parent1 != -1) {
tikhomirov@328: 					p1 = completeHistory[parent1];
tikhomirov@328: 				}
tikhomirov@328: 				if (parent2!= -1) {
tikhomirov@328: 					p2 = completeHistory[parent2];
tikhomirov@328: 				}
tikhomirov@328: 				completeHistory[revisionNumber] = new HistoryNode(commitRevisions[revisionNumber], revision, p1, p2);
tikhomirov@328: 			}
tikhomirov@328: 			
tikhomirov@366: 			HistoryNode[] go(HgDataFile fileNode) throws HgInvalidControlFileException {
tikhomirov@328: 				completeHistory = new HistoryNode[fileNode.getRevisionCount()];
tikhomirov@328: 				commitRevisions = new int[completeHistory.length];
tikhomirov@328: 				fileNode.walk(0, TIP, this);
tikhomirov@328: 				return completeHistory;
tikhomirov@328: 			}
tikhomirov@328: 		};
tikhomirov@328: 		final ProgressSupport progressHelper = getProgressSupport(handler);
tikhomirov@328: 		progressHelper.start(4);
tikhomirov@328: 		final CancelSupport cancelHelper = getCancelSupport(handler, true);
tikhomirov@328: 		cancelHelper.checkCancelled();
tikhomirov@328: 		HgDataFile fileNode = repo.getFileNode(file);
tikhomirov@328: 		// build tree of nodes according to parents in file's revlog
tikhomirov@328: 		final TreeBuildInspector treeBuildInspector = new TreeBuildInspector();
tikhomirov@328: 		final HistoryNode[] completeHistory = treeBuildInspector.go(fileNode);
tikhomirov@328: 		progressHelper.worked(1);
tikhomirov@328: 		cancelHelper.checkCancelled();
tikhomirov@328: 		ElementImpl ei = new ElementImpl(treeBuildInspector.commitRevisions.length);
tikhomirov@328: 		final ProgressSupport ph2;
tikhomirov@328: 		if (treeBuildInspector.commitRevisions.length < 100 /*XXX is it really worth it? */) {
tikhomirov@328: 			ei.initTransform();
tikhomirov@328: 			repo.getChangelog().range(ei, treeBuildInspector.commitRevisions);
tikhomirov@328: 			progressHelper.worked(1);
tikhomirov@328: 			ph2 = new ProgressSupport.Sub(progressHelper, 2);
tikhomirov@328: 		} else {
tikhomirov@328: 			ph2 = new ProgressSupport.Sub(progressHelper, 3);
tikhomirov@328: 		}
tikhomirov@370: 		try {
tikhomirov@370: 			ph2.start(completeHistory.length);
tikhomirov@370: 			// XXX shall sort completeHistory according to changeset numbers?
tikhomirov@370: 			for (int i = 0; i < completeHistory.length; i++ ) {
tikhomirov@370: 				final HistoryNode n = completeHistory[i];
tikhomirov@370: 				handler.next(ei.init(n));
tikhomirov@370: 				ph2.worked(1);
tikhomirov@370: 				cancelHelper.checkCancelled();
tikhomirov@370: 			}
tikhomirov@370: 		} catch (HgCallbackTargetException.Wrap ex) {
tikhomirov@370: 			throw new HgCallbackTargetException(ex);
tikhomirov@328: 		}
tikhomirov@328: 		progressHelper.done();
tikhomirov@328: 	}
tikhomirov@328: 	
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@383: 			// FIXME implement date support for log
tikhomirov@64: 		}
tikhomirov@64: 		count++;
tikhomirov@193: 		csetTransform.next(revisionNumber, nodeid, cset);
tikhomirov@64: 	}
tikhomirov@195: 	
tikhomirov@366: 	private HgChangelog.ParentWalker getParentHelper(boolean create) throws HgInvalidControlFileException {
tikhomirov@328: 		if (parentHelper == null && create) {
tikhomirov@195: 			parentHelper = repo.getChangelog().new ParentWalker();
tikhomirov@195: 			parentHelper.init();
tikhomirov@195: 		}
tikhomirov@195: 		return parentHelper;
tikhomirov@195: 	}
tikhomirov@195: 
tikhomirov@64: 
tikhomirov@205: 	/**
tikhomirov@205: 	 * When {@link HgLogCommand} is executed against file, handler passed to {@link HgLogCommand#execute(HgChangesetHandler)} may optionally
tikhomirov@249: 	 * implement this interface to get information about file renames. Method {@link #copy(HgFileRevision, HgFileRevision)} would
tikhomirov@129: 	 * get invoked prior any changeset of the original file (if file history being followed) is reported via {@link #next(HgChangeset)}.
tikhomirov@80: 	 * 
tikhomirov@131: 	 * For {@link HgLogCommand#file(Path, boolean)} with renamed file path and follow argument set to false, 
tikhomirov@249: 	 * {@link #copy(HgFileRevision, HgFileRevision)} would be invoked for the first copy/rename in the history of the file, but not 
tikhomirov@80: 	 * followed by any changesets. 
tikhomirov@80: 	 *
tikhomirov@80: 	 * @author Artem Tikhomirov
tikhomirov@80: 	 * @author TMate Software Ltd.
tikhomirov@80: 	 */
tikhomirov@370: 	public interface FileHistoryHandler extends HgChangesetHandler { // FIXME move to stanalone class file, perhaps?
tikhomirov@80: 		// XXX perhaps, should distinguish copy from rename? And what about merged revisions and following them?
tikhomirov@370: 		/**
tikhomirov@370: 		 * @throws HgCallbackTargetException.Wrap wrapper object for any exception user code may produce. Wrapped exception would get re-thrown with {@link HgCallbackTargetException} 
tikhomirov@370: 		 */
tikhomirov@370: 		void copy(HgFileRevision from, HgFileRevision to) throws HgCallbackTargetException.Wrap;
tikhomirov@80: 	}
tikhomirov@80: 	
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@129: 		public void next(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@328: 		final HistoryNode parent1, 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@328: 		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@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@366: 		public HgChangeset changeset() throws HgException {
tikhomirov@328: 			return get(historyNode.changeset)[0];
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@366: 		public Pair<HgChangeset, HgChangeset> parents() throws HgException {
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@366: 		public Collection<HgChangeset> children() throws HgException {
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@328: 			cachedChangesets.put(cs.getRevision(), cs);
tikhomirov@328: 		}
tikhomirov@328: 		
tikhomirov@366: 		private HgChangeset[] get(int... changelogRevisionNumber) throws HgInvalidControlFileException {
tikhomirov@328: 			HgChangeset[] rv = new HgChangeset[changelogRevisionNumber.length];
tikhomirov@328: 			IntVector misses = new IntVector(changelogRevisionNumber.length, -1);
tikhomirov@328: 			for (int i = 0; i < changelogRevisionNumber.length; i++) {
tikhomirov@328: 				if (changelogRevisionNumber[i] == -1) {
tikhomirov@328: 					rv[i] = null;
tikhomirov@328: 					continue;
tikhomirov@328: 				}
tikhomirov@328: 				HgChangeset cached = cachedChangesets.get(changelogRevisionNumber[i]);
tikhomirov@328: 				if (cached != null) {
tikhomirov@328: 					rv[i] = cached;
tikhomirov@328: 				} else {
tikhomirov@328: 					misses.add(changelogRevisionNumber[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@328: 						if (cs == null) {
tikhomirov@328: 							throw new HgBadStateException();
tikhomirov@328: 						}
tikhomirov@328: 						// HgChangelog.range may reorder changesets according to their order in the changelog
tikhomirov@328: 						// thus need to find original index
tikhomirov@328: 						boolean sanity = false;
tikhomirov@328: 						for (int i = 0; i < changelogRevisionNumber.length; i++) {
tikhomirov@328: 							if (changelogRevisionNumber[i] == cs.getRevision()) {
tikhomirov@328: 								rv[i] = cs;
tikhomirov@328: 								sanity = true;
tikhomirov@328: 								break;
tikhomirov@328: 							}
tikhomirov@328: 						}
tikhomirov@328: 						assert sanity;
tikhomirov@328: 				}
tikhomirov@328: 			}
tikhomirov@328: 			return rv;
tikhomirov@328: 		}
tikhomirov@328: 
tikhomirov@328: 		// init only when needed
tikhomirov@366: 		void initTransform() throws HgInvalidControlFileException {
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@328: 		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@328: 		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@328: 		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@328: 		private Nodeid getRevision(int changelogRevisionNumber) {
tikhomirov@328: 			// XXX pipe through pool
tikhomirov@328: 			HgChangeset cs = cachedChangesets.get(changelogRevisionNumber);
tikhomirov@328: 			if (cs != null) {
tikhomirov@328: 				return cs.getNodeid();
tikhomirov@328: 			} else {
tikhomirov@354: 				try {
tikhomirov@354: 					return repo.getChangelog().getRevision(changelogRevisionNumber);
tikhomirov@354: 				} catch (HgException ex) {
tikhomirov@354: 					HgInternals.getContext(repo).getLog().error(getClass(), ex, null);
tikhomirov@354: 					// FIXME propagate, perhaps?
tikhomirov@354: 					return Nodeid.NULL; // FIXME this is quick-n-dirty hack to move forward with introducing exceptions 
tikhomirov@354: 				}
tikhomirov@328: 			}
tikhomirov@328: 		}
tikhomirov@328: 	}
tikhomirov@64: }