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annotate src/com/tmate/hgkit/ll/Nodeid.java @ 20:11cfabe692b3

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 04 Jan 2011 02:08:25 +0100
parents df8c67f3006a
children 603806cd2dc6
rev   line source
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1 /*
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2 * Copyright (c) 2010, 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.ll;
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6 import java.util.Arrays;
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9 /**
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10 * Whether to store fixed size array (20 bytes) - ease of manipulation (e.g. hashcode/equals), or
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11 * memory effective - reuse supplied array, keep significant bits only?
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12 * Fixed size array looks most appealing to me now - I doubt one can save any significant amount of memory.
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13 * There'd always 20 non-zero bytes, the difference is only for any extra bytes one may pass to constructor
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14 * @author artem
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15 *
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16 */
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17 public final class Nodeid implements Comparable<Nodeid> {
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19 public static int NULLREV = -1;
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20 private final byte[] binaryData;
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22 public Nodeid(byte[] binaryRepresentation) {
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23 // 5 int fields => 32 bytes
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24 // byte[20] => 48 bytes
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25 this.binaryData = binaryRepresentation;
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26 }
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28 // instead of hashCode/equals
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29 public int compareTo(Nodeid o) {
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30 byte[] a1, a2;
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31 if (this.binaryData.length != 20) {
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32 a1 = new byte[20];
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33 System.arraycopy(binaryData, 0, a1, 20 - binaryData.length, binaryData.length);
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34 } else {
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35 a1 = this.binaryData;
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36 }
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37
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38 if (o.binaryData.length != 20) {
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39 a2 = new byte[20];
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40 System.arraycopy(o.binaryData, 0, a2, 20 - o.binaryData.length, o.binaryData.length);
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41 } else {
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42 a2 = o.binaryData;
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43 }
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44 return Arrays.equals(a1, a2) ? 0 : -1;
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45 }
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47 @Override
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48 public String toString() {
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49 return new DigestHelper().toHexString(binaryData, 0, binaryData.length);
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50 }
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52 // binascii.unhexlify()
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53 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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54 assert length % 2 == 0; // Python's binascii.hexlify convert each byte into 2 digits
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55 byte[] data = new byte[length >>> 1]; // XXX use known size instead? nodeid is always 20 bytes
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56 for (int i = 0, j = offset; i < data.length; i++) {
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57 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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58 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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59 data[i] = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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60 }
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61 return new Nodeid(data);
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62 }
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63 }