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annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents e55f17a7a195
children 7c0d2ce340b8
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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21 /**
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22 * Serialization friend of {@link DataAccess}
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 @Experimental(reason="Work in progress")
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28 public class DataSerializer {
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29
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30 public void writeByte(byte... values) throws IOException {
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31 write(values, 0, values.length);
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32 }
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34 public void writeInt(int... values) throws IOException {
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35 byte[] buf = new byte[4];
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36 for (int v : values) {
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37 bigEndian(v, buf, 0);
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38 write(buf, 0, buf.length);
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39 }
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40 }
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42 public void write(byte[] data, int offset, int length) throws IOException {
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43 throw new IOException("Attempt to write to non-existent file");
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44 }
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46 public void done() {
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47 // FIXME perhaps, shall allow IOException, too
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48 // no-op
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49 }
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51 /**
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52 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian.
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53 */
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54 public static final void bigEndian(int value, byte[] buffer, int offset) {
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55 assert offset + 4 <= buffer.length;
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56 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff);
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57 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff);
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58 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff);
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59 buffer[offset++] = (byte) (value & 0x0ff);
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60 }
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61
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62 /**
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63 * Denotes an entity that wants to/could be serialized
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64 */
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65 @Experimental(reason="Work in progress")
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66 interface DataSource {
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67 public void serialize(DataSerializer out) throws IOException;
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68
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69 /**
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70 * Hint of data length it would like to writes
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71 * @return -1 if can't answer
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72 */
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73 public int serializeLength();
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74 }
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76 public static class ByteArrayDataSource implements DataSource {
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78 private final byte[] data;
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80 public ByteArrayDataSource(byte[] bytes) {
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81 data = bytes;
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82 }
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84 public void serialize(DataSerializer out) throws IOException {
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85 if (data != null) {
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86 out.write(data, 0, data.length);
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87 }
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88 }
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90 public int serializeLength() {
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91 return data == null ? 0 : data.length;
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92 }
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94 }
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95 }