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annotate src/com/tmate/hgkit/ll/Nodeid.java @ 24:d4fdd1845b3f

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Nodeid with array of exactly 20 bytes
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 06 Jan 2011 04:42:15 +0100
parents 603806cd2dc6
children b2251b7a9823
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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10 /**
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11 * Whether to store fixed size array (20 bytes) - ease of manipulation (e.g. hashcode/equals), or
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12 * memory effective - reuse supplied array, keep significant bits only?
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13 * Fixed size array looks most appealing to me now - I doubt one can save any significant amount of memory.
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14 * There'd always 20 non-zero bytes, the difference is only for any extra bytes one may pass to constructor
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15 * @author artem
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16 *
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17 */
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18 public final class Nodeid {
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20 public static int NULLREV = -1;
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21 private final byte[] binaryData;
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23 /**
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24 * @param binaryRepresentation - byte[20], kept by reference. Use {@link #clone()} if original array may get changed.
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25 */
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26 public Nodeid(byte[] binaryRepresentation) {
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27 // 5 int fields => 32 bytes
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28 // byte[20] => 48 bytes
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29 if (binaryRepresentation == null || binaryRepresentation.length != 20) {
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30 throw new IllegalArgumentException();
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31 }
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32 this.binaryData = binaryRepresentation;
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33 }
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34
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35 @Override
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36 public int hashCode() {
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37 // TODO consider own impl, especially if byte[] get replaced with 5 ints
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38 return Arrays.hashCode(binaryData);
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39 }
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40
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41 @Override
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42 public boolean equals(Object o) {
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43 if (o instanceof Nodeid) {
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44 return Arrays.equals(this.binaryData, ((Nodeid) o).binaryData);
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45 }
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46 return false;
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47 }
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48
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49 public boolean equalsTo(byte[] buf) {
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50 return Arrays.equals(this.binaryData, buf);
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51 }
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53 @Override
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54 public String toString() {
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55 return new DigestHelper().toHexString(binaryData, 0, binaryData.length);
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56 }
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57
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58 // binascii.unhexlify()
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59 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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60 if (length != 40) {
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61 throw new IllegalArgumentException();
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62 }
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63 byte[] data = new byte[20];
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64 for (int i = 0, j = offset; i < data.length; i++) {
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65 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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66 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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67 data[i] = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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68 }
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69 return new Nodeid(data);
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70 }
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71 }