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@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@423: import org.tmatesoft.hg.repo.HgInvalidControlFileException;
tikhomirov@423: import org.tmatesoft.hg.repo.HgInvalidStateException;
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@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@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@427: 		} catch (HgRuntimeException 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@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@427: 				if (!fileNode.exists()) {
tikhomirov@427: 					throw new HgPathNotFoundException(String.format("File %s not found in the repository", file), file);
tikhomirov@427: 				}
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: 		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@423: 		ph2.start(completeHistory.length);
tikhomirov@423: 		// XXX shall sort completeHistory according to changeset numbers?
tikhomirov@423: 		for (int i = 0; i < completeHistory.length; i++ ) {
tikhomirov@423: 			final HistoryNode n = completeHistory[i];
tikhomirov@427: 			handler.treeElement(ei.init(n));
tikhomirov@423: 			ph2.worked(1);
tikhomirov@423: 			cancelHelper.checkCancelled();
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@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@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: 	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@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@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@403: 						HgInternals.getContext(repo).getLog().error(getClass(), "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@64: }