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annotate src/com/tmate/hgkit/ll/HgDataFile.java @ 9:d6d2a630f4a6

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Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 25 Dec 2010 04:45:59 +0100
parents fc265ddeab26
children 571e1b2cc3f7
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1 /**
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2 * Copyright (c) 2010 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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6 import static com.tmate.hgkit.ll.HgRepository.TIP;
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8 /**
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9 * Extends Revlog/uses RevlogStream?
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10 * ? name:HgFileNode?
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11 * @author artem
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12 */
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13 public class HgDataFile extends Revlog {
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15 private final RevlogStream content; // XXX move up to Revlog?
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16
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17 // absolute from repo root?
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18 // slashes, unix-style?
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19 // repo location agnostic, just to give info to user, not to access real storage
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20 private final String path;
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22 /*package-local*/HgDataFile(HgRepository hgRepo, String path, RevlogStream content) {
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23 super(hgRepo);
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24 this.path = path;
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25 this.content = content;
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26 }
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27
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28 public boolean exists() {
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29 return content != null; // XXX need better impl
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30 }
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31
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32 public String getPath() {
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33 return path; // hgRepo.backresolve(this) -> name?
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34 }
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35
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36 public int getRevisionCount() {
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37 return content.revisionCount();
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38 }
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39
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40 public byte[] content() {
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41 return content(TIP);
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42 }
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43
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44 public byte[] content(int revision) {
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45 final byte[][] dataPtr = new byte[1][];
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46 Revlog.Inspector insp = new Revlog.Inspector() {
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47 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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48 dataPtr[0] = data;
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49 }
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50 };
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51 content.iterate(revision, revision, true, insp);
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52 return dataPtr[0];
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53 }
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54
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55 public void history(Changeset.Inspector inspector) {
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56 if (!exists()) {
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57 throw new IllegalStateException("Can't get history of invalid repository file node");
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58 }
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59 final int[] commitRevisions = new int[content.revisionCount()];
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60 Revlog.Inspector insp = new Revlog.Inspector() {
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61 int count = 0;
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62
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63 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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64 commitRevisions[count++] = linkRevision;
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65 }
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66 };
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67 content.iterate(0, -1, false, insp);
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68 getRepo().getChangelog().range(inspector, commitRevisions);
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69 }
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70
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71 public void history(int start, int end, Changeset.Inspector i) {
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72 throw HgRepository.notImplemented();
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73 }
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74 }