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annotate src/com/tmate/hgkit/ll/RevlogIndexStreamAccess.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 dbd663faec1f
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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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5
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6 import java.io.DataInput;
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7 import java.io.IOException;
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8
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9 /**
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10 * @author artem
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11 *
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12 */
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13 public class RevlogIndexStreamAccess {
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14
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15 private final RevlogStream stream;
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16
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17 // takes RevlogStream. RevlogStream delegates calls for data to this accessor, which in turn refers back to RevlogStream to get
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18 // correct [Input|Data]Stream according to revlog version (Revlogv0 or RevlogNG)
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19
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20 public RevlogIndexStreamAccess(RevlogStream stream) {
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21 this.stream = stream;
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22 // TODO Auto-generated constructor stub
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23 }
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24
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25
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26 void readRevlogV0Record() throws IOException {
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27 DataInput di = null; //FIXME stream.getIndexStream();
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28 int offset = di.readInt();
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29 int compressedLen = di.readInt();
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30 int baseRevision = di.readInt();
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31 int linkRevision = di.readInt();
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32 // int r = (((buf[0] & 0xff) << 24) | ((buf[1] & 0xff) << 16) | ((buf[2] & 0xff) << 8) | (buf[3] & 0xff));
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33 byte[] buf = new byte[20];
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34 di.readFully(buf, 0, 20);
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35 Object nodeidOwn = buf.clone();
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36 // XXX nodeid as an Object with hash/equals?
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37 di.readFully(buf, 0, 20);
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38 Object nodeidParent1 = buf.clone();
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39 di.readFully(buf, 0, 20);
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40 Object nodeidParent2 = buf.clone();
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41 }
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42
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43 // another subclass?
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44 void readRevlogNGRecord() throws IOException {
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45 DataInput di = null; //FIXME stream.getIndexStream();
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46 long l = di.readLong();
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47 long offset = l >>> 16;
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48 int flags = (int) (l & 0X0FFFF);
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49 int compressedLen = di.readInt();
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50 int actualLen = di.readInt();
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51 int baseRevision = di.readInt();
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52 int linkRevision = di.readInt();
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53 int parent1Revision = di.readInt();
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54 int parent2Revision = di.readInt();
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55 byte[] buf = new byte[32];
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56 di.readFully(buf, 0, 20+12);
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57 Object nodeid = buf/*[0..20]*/;
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58
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59 }
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60 }