tikhomirov@596: /*
tikhomirov@596:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@596:  *  
tikhomirov@596:  * This program is free software; you can redistribute it and/or modify
tikhomirov@596:  * it under the terms of the GNU General Public License as published by
tikhomirov@596:  * the Free Software Foundation; version 2 of the License.
tikhomirov@596:  *
tikhomirov@596:  * This program is distributed in the hope that it will be useful,
tikhomirov@596:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@596:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@596:  * GNU General Public License for more details.
tikhomirov@596:  *
tikhomirov@596:  * For information on how to redistribute this software under
tikhomirov@596:  * the terms of a license other than GNU General Public License
tikhomirov@596:  * contact TMate Software at support@hg4j.com
tikhomirov@596:  */
tikhomirov@596: package org.tmatesoft.hg.internal;
tikhomirov@596: 
tikhomirov@596: import static org.tmatesoft.hg.core.HgIterateDirection.OldToNew;
tikhomirov@596: import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
tikhomirov@596: import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
tikhomirov@596: 
tikhomirov@596: import java.util.Arrays;
tikhomirov@596: import java.util.BitSet;
tikhomirov@596: import java.util.LinkedList;
tikhomirov@596: 
tikhomirov@596: import org.tmatesoft.hg.core.HgIterateDirection;
tikhomirov@596: import org.tmatesoft.hg.core.Nodeid;
tikhomirov@596: import org.tmatesoft.hg.repo.HgDataFile;
tikhomirov@596: import org.tmatesoft.hg.repo.HgRepository;
tikhomirov@596: 
tikhomirov@596: /**
tikhomirov@596:  * Piece of file history, identified by path, limited to file revisions from range [chop..init] of changesets, 
tikhomirov@596:  * can be linked to another piece.
tikhomirov@596:  * 
tikhomirov@596:  * @author Artem Tikhomirov
tikhomirov@596:  * @author TMate Software Ltd.
tikhomirov@596:  */
tikhomirov@596: public final class FileRevisionHistoryChunk {
tikhomirov@596: 	private final HgDataFile df;
tikhomirov@596: 	// change ancestry, sequence of file revisions
tikhomirov@596: 	private IntVector fileRevsToVisit;
tikhomirov@596: 	// parent pairs of complete file history
tikhomirov@596: 	private IntVector fileParentRevs;
tikhomirov@596: 	// map file revision to changelog revision (sparse array, only file revisions to visit are set)
tikhomirov@596: 	private int[] file2changelog;
tikhomirov@596: 	private int originChangelogRev = BAD_REVISION, originFileRev = BAD_REVISION;
tikhomirov@596: 	private int csetRangeStart = NO_REVISION, csetRangeEnd = BAD_REVISION; 
tikhomirov@596: 	
tikhomirov@596: 
tikhomirov@596: 	public FileRevisionHistoryChunk(HgDataFile file) {
tikhomirov@596: 		df = file;
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	/**
tikhomirov@596: 	 * @return file at this specific chunk of history (i.e. its path may be different from the paths of other chunks)
tikhomirov@596: 	 */
tikhomirov@596: 	public HgDataFile getFile() {
tikhomirov@596: 		return df;
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	/**
tikhomirov@596: 	 * @return changeset this file history chunk was chopped at, or {@link HgRepository#NO_REVISION} if none specified
tikhomirov@596: 	 */
tikhomirov@596: 	public int getStartChangeset() {
tikhomirov@596: 		return csetRangeStart;
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	/**
tikhomirov@596: 	 * @return changeset this file history chunk ends at
tikhomirov@596: 	 */
tikhomirov@596: 	public int getEndChangeset() {
tikhomirov@596: 		return csetRangeEnd;
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	public void init(int changelogRevisionIndex) {
tikhomirov@596: 		csetRangeEnd = changelogRevisionIndex;
tikhomirov@596: 		// XXX df.indexWalk(0, fileRevIndex, ) might be more effective
tikhomirov@596: 		Nodeid fileRev = df.getRepo().getManifest().getFileRevision(changelogRevisionIndex, df.getPath());
tikhomirov@596: 		int fileRevIndex = df.getRevisionIndex(fileRev);
tikhomirov@596: 		int[] fileRevParents = new int[2];
tikhomirov@596: 		fileParentRevs = new IntVector((fileRevIndex+1) * 2, 0);
tikhomirov@596: 		fileParentRevs.add(NO_REVISION, NO_REVISION); // parents of fileRevIndex == 0
tikhomirov@596: 		for (int i = 1; i <= fileRevIndex; i++) {
tikhomirov@596: 			df.parents(i, fileRevParents, null, null);
tikhomirov@596: 			fileParentRevs.add(fileRevParents[0], fileRevParents[1]);
tikhomirov@596: 		}
tikhomirov@596: 		// fileRevsToVisit keep file change ancestry from new to old
tikhomirov@596: 		fileRevsToVisit = new IntVector(fileRevIndex + 1, 0);
tikhomirov@596: 		// keep map of file revision to changelog revision
tikhomirov@596: 		file2changelog = new int[fileRevIndex+1];
tikhomirov@596: 		// only elements worth visit would get mapped, so there would be unfilled areas in the file2changelog,
tikhomirov@596: 		// prevent from error (make it explicit) by bad value
tikhomirov@596: 		Arrays.fill(file2changelog, BAD_REVISION);
tikhomirov@596: 		LinkedList<Integer> queue = new LinkedList<Integer>();
tikhomirov@596: 		BitSet seen = new BitSet(fileRevIndex + 1);
tikhomirov@596: 		queue.add(fileRevIndex);
tikhomirov@596: 		do {
tikhomirov@596: 			int x = queue.removeFirst();
tikhomirov@596: 			if (seen.get(x)) {
tikhomirov@596: 				continue;
tikhomirov@596: 			}
tikhomirov@596: 			seen.set(x);
tikhomirov@596: 			fileRevsToVisit.add(x);
tikhomirov@596: 			file2changelog[x] = df.getChangesetRevisionIndex(x);
tikhomirov@596: 			int p1 = fileParentRevs.get(2*x);
tikhomirov@596: 			int p2 = fileParentRevs.get(2*x + 1);
tikhomirov@596: 			if (p1 != NO_REVISION) {
tikhomirov@596: 				queue.addLast(p1);
tikhomirov@596: 			}
tikhomirov@596: 			if (p2 != NO_REVISION) {
tikhomirov@596: 				queue.addLast(p2);
tikhomirov@596: 			}
tikhomirov@596: 		} while (!queue.isEmpty());
tikhomirov@596: 		// make sure no child is processed before we handled all (grand-)parents of the element
tikhomirov@596: 		fileRevsToVisit.sort(false);
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	public void linkTo(FileRevisionHistoryChunk target) {
tikhomirov@596: 		// assume that target.init() has been called already 
tikhomirov@596: 		if (target == null) {
tikhomirov@596: 			return;
tikhomirov@596: 		}
tikhomirov@596: 		target.originFileRev = fileRevsToVisit.get(0); // files to visit are new to old
tikhomirov@596: 		target.originChangelogRev = changeset(target.originFileRev);
tikhomirov@596: 	}
tikhomirov@596: 
tikhomirov@596: 	/**
tikhomirov@596: 	 * Mark revision closest(ceil) to specified as the very first one (no parents) 
tikhomirov@596: 	 */
tikhomirov@596: 	public void chopAtChangeset(int firstChangelogRevOfInterest) {
tikhomirov@596: 		csetRangeStart = firstChangelogRevOfInterest;
tikhomirov@596: 		if (firstChangelogRevOfInterest == 0) {
tikhomirov@596: 			return; // nothing to do
tikhomirov@596: 		}
tikhomirov@596: 		int i = 0, x = fileRevsToVisit.size(), fileRev = BAD_REVISION;
tikhomirov@596: 		// fileRevsToVisit is new to old, greater numbers to smaller
tikhomirov@596: 		while (i < x && changeset(fileRev = fileRevsToVisit.get(i)) >= firstChangelogRevOfInterest) {
tikhomirov@596: 			i++;
tikhomirov@596: 		}
tikhomirov@596: 		assert fileRev != BAD_REVISION; // there's at least 1 revision in fileRevsToVisit
tikhomirov@596: 		if (i == x && changeset(fileRev) != firstChangelogRevOfInterest) {
tikhomirov@596: 			assert false : "Requested changeset shall belong to the chunk";
tikhomirov@596: 			return;
tikhomirov@596: 		}
tikhomirov@596: 		fileRevsToVisit.trimTo(i); // no need to iterate more
tikhomirov@596: 		// pretend fileRev got no parents
tikhomirov@596: 		fileParentRevs.set(fileRev * 2, NO_REVISION);
tikhomirov@596: 		fileParentRevs.set(fileRev, NO_REVISION);
tikhomirov@596: 	}
tikhomirov@596: 
tikhomirov@596: 	public int[] fileRevisions(HgIterateDirection iterateOrder) {
tikhomirov@596: 		// fileRevsToVisit is { r10, r7, r6, r5, r0 }, new to old
tikhomirov@596: 		int[] rv = fileRevsToVisit.toArray();
tikhomirov@596: 		if (iterateOrder == OldToNew) {
tikhomirov@596: 			// reverse return value
tikhomirov@596: 			for (int a = 0, b = rv.length-1; a < b; a++, b--) {
tikhomirov@596: 				int t = rv[b];
tikhomirov@596: 				rv[b] = rv[a];
tikhomirov@596: 				rv[a] = t;
tikhomirov@596: 			}
tikhomirov@596: 		}
tikhomirov@596: 		return rv;
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	public int changeset(int fileRevIndex) {
tikhomirov@596: 		return file2changelog[fileRevIndex];
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	public void fillFileParents(int fileRevIndex, int[] fileParents) {
tikhomirov@596: 		if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
tikhomirov@596: 			// this chunk continues another file
tikhomirov@596: 			assert originFileRev != NO_REVISION;
tikhomirov@596: 			fileParents[0] = originFileRev;
tikhomirov@596: 			fileParents[1] = NO_REVISION;
tikhomirov@596: 			return;
tikhomirov@596: 		}
tikhomirov@596: 		fileParents[0] = fileParentRevs.get(fileRevIndex * 2);
tikhomirov@596: 		fileParents[1] = fileParentRevs.get(fileRevIndex * 2 + 1);
tikhomirov@596: 	}
tikhomirov@596: 	
tikhomirov@596: 	public void fillCsetParents(int fileRevIndex, int[] csetParents) {
tikhomirov@596: 		if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
tikhomirov@596: 			assert originFileRev != NO_REVISION;
tikhomirov@596: 			csetParents[0] = originChangelogRev;
tikhomirov@596: 			csetParents[1] = NO_REVISION; // I wonder if possible to start a copy with two parents?
tikhomirov@596: 			return;
tikhomirov@596: 		}
tikhomirov@596: 		int fp1 = fileParentRevs.get(fileRevIndex * 2);
tikhomirov@596: 		int fp2 = fileParentRevs.get(fileRevIndex * 2 + 1);
tikhomirov@596: 		csetParents[0] = fp1 == NO_REVISION ? NO_REVISION : changeset(fp1);
tikhomirov@596: 		csetParents[1] = fp2 == NO_REVISION ? NO_REVISION : changeset(fp2);
tikhomirov@596: 	}
tikhomirov@596: }