Mercurial > jhg

annotate src/com/tmate/hgkit/ll/RevlogStream.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 5abe5af181bd
children 382cfe9463db
rev   line source
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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 static com.tmate.hgkit.ll.HgRepository.TIP;
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7
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8 import java.io.File;
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9 import java.io.FileInputStream;
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10 import java.io.IOException;
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11 import java.nio.ByteBuffer;
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12 import java.nio.MappedByteBuffer;
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13 import java.nio.channels.FileChannel;
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14 import java.util.ArrayList;
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15 import java.util.Collections;
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16 import java.util.LinkedList;
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17 import java.util.List;
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18 import java.util.zip.DataFormatException;
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19 import java.util.zip.Inflater;
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20
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21 /**
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22 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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23 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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24 * @author artem
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25 * @see http://mercurial.selenic.com/wiki/Revlog
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26 * @see http://mercurial.selenic.com/wiki/RevlogNG
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27 */
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28 public class RevlogStream {
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29
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30 private List<IndexEntry> index; // indexed access highly needed
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31 private boolean inline = false;
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32 private final File indexFile;
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33
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34 RevlogStream(File indexFile) {
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35 this.indexFile = indexFile;
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36 }
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37
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38 /*package*/ DataAccess getIndexStream() {
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39 return create(indexFile);
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40 }
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41
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42 /*package*/ DataAccess getDataStream() {
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43 final String indexName = indexFile.getName();
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44 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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45 return create(dataFile);
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46 }
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47
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48 private DataAccess create(File f) {
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49 if (!f.exists()) {
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50 return new DataAccess();
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51 }
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52 try {
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53 FileChannel fc = new FileInputStream(f).getChannel();
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54 final int MAPIO_MAGIC_BOUNDARY = 100 * 1024;
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55 if (fc.size() > MAPIO_MAGIC_BOUNDARY) {
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56 return new MemoryMapFileAccess(fc, fc.size());
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57 } else {
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58 return new FileAccess(fc, fc.size());
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59 }
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60 } catch (IOException ex) {
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61 // unlikely to happen, we've made sure file exists.
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62 ex.printStackTrace(); // FIXME log error
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63 }
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64 return new DataAccess(); // non-null, empty.
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65 }
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66
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67 public int revisionCount() {
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68 initOutline();
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69 return index.size();
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70 }
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71
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72 private final int REVLOGV1_RECORD_SIZE = 64;
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73
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74 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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75 // ? boolean needsNodeid
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76 public void iterate(int start, int end, boolean needData, Revlog.Inspector inspector) {
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77 initOutline();
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78 final int indexSize = index.size();
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79 if (indexSize == 0) {
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80 return;
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81 }
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82 if (end == TIP) {
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83 end = indexSize - 1;
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84 }
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85 if (start == TIP) {
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86 start = indexSize - 1;
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87 }
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88 if (start < 0 || start >= indexSize) {
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89 throw new IllegalArgumentException("Bad left range boundary " + start);
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90 }
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91 if (end < start || end >= indexSize) {
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92 throw new IllegalArgumentException("Bad right range boundary " + end);
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93 }
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94 // XXX may cache [start .. end] from index with a single read (pre-read)
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95
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96 DataAccess daIndex = null, daData = null;
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97 daIndex = getIndexStream();
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98 if (needData && !inline) {
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99 daData = getDataStream();
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100 }
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101 try {
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102 byte[] lastData = null;
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103 int i;
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104 boolean extraReadsToBaseRev = false;
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105 if (needData && index.get(start).baseRevision < start) {
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106 i = index.get(start).baseRevision;
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107 extraReadsToBaseRev = true;
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108 } else {
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109 i = start;
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110 }
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111
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112 daIndex.seek(inline ? (int) index.get(i).offset : start * REVLOGV1_RECORD_SIZE);
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113 for (; i <= end; i++ ) {
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114 long l = daIndex.readLong();
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115 long offset = l >>> 16;
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116 int flags = (int) (l & 0X0FFFF);
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117 int compressedLen = daIndex.readInt();
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118 int actualLen = daIndex.readInt();
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119 int baseRevision = daIndex.readInt();
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120 int linkRevision = daIndex.readInt();
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121 int parent1Revision = daIndex.readInt();
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122 int parent2Revision = daIndex.readInt();
2
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123 byte[] buf = new byte[32];
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124 // XXX Hg keeps 12 last bytes empty, we move them into front here
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125 daIndex.readBytes(buf, 12, 20);
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126 daIndex.skip(12);
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127 byte[] data = null;
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128 if (needData) {
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129 byte[] dataBuf = new byte[compressedLen];
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130 if (inline) {
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131 daIndex.readBytes(dataBuf, 0, compressedLen);
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132 } else {
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133 daData.seek(index.get(i).offset);
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134 daData.readBytes(dataBuf, 0, compressedLen);
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135 }
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136 if (dataBuf[0] == 0x78 /* 'x' */) {
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137 try {
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138 Inflater zlib = new Inflater();
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139 zlib.setInput(dataBuf, 0, compressedLen);
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140 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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141 int resultLen = zlib.inflate(result);
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142 zlib.end();
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143 data = new byte[resultLen];
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144 System.arraycopy(result, 0, data, 0, resultLen);
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145 } catch (DataFormatException ex) {
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146 ex.printStackTrace();
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147 data = new byte[0]; // FIXME need better failure strategy
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148 }
2
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149 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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150 data = new byte[dataBuf.length - 1];
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151 System.arraycopy(dataBuf, 1, data, 0, data.length);
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152 } else {
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153 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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154 // but I don't see reason not to return data as is
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155 data = dataBuf;
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156 }
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157 // XXX
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158 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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159 // this is a patch
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160 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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161 int patchElementIndex = 0;
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162 do {
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163 final int x = patchElementIndex; // shorthand
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164 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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165 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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166 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
3
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167 patchElementIndex += 12 + len;
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168 patches.add(new PatchRecord(p1, p2, len, data, x+12));
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169 } while (patchElementIndex < data.length);
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170 //
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171 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
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172 data = apply(baseRevContent, actualLen, patches);
3
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173 }
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174 } else {
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175 if (inline) {
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176 daIndex.skip(compressedLen);
3
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177 }
2
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178 }
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179 if (!extraReadsToBaseRev || i >= start) {
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180 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, buf, data);
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181 }
3
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182 lastData = data;
2
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183 }
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184 } catch (IOException ex) {
3
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185 throw new IllegalStateException(ex); // FIXME need better handling
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186 } finally {
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187 daIndex.done();
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188 if (daData != null) {
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189 daData.done();
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190 }
2
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191 }
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192 }
0
dbd663faec1f Basic changelog parsing
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193
2
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194 private void initOutline() {
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195 if (index != null && !index.isEmpty()) {
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196 return;
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197 }
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198 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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199 DataAccess da = getIndexStream();
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200 try {
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201 int versionField = da.readInt();
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202 da.readInt(); // just to skip next 2 bytes of offset + flags
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203 final int INLINEDATA = 1 << 16;
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204 inline = (versionField & INLINEDATA) != 0;
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205 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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206 while(true) {
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207 int compressedLen = da.readInt();
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208 // 8+4 = 12 bytes total read here
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209 int actualLen = da.readInt();
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210 int baseRevision = da.readInt();
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211 // 12 + 8 = 20 bytes read here
2
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212 // int linkRevision = di.readInt();
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213 // int parent1Revision = di.readInt();
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214 // int parent2Revision = di.readInt();
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215 // byte[] nodeid = new byte[32];
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216 if (inline) {
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217 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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218 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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219 } else {
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220 res.add(new IndexEntry(offset, baseRevision));
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221 da.skip(3*4 + 32);
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222 }
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223 if (da.nonEmpty()) {
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224 long l = da.readLong();
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225 offset = l >>> 16;
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226 } else {
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227 // fine, done then
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228 index = res;
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229 break;
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230 }
2
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231 }
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232 } catch (IOException ex) {
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233 ex.printStackTrace(); // log error
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diff changeset
234 // too bad, no outline then.
2
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diff changeset
235 index = Collections.emptyList();
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236 } finally {
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diff changeset
237 da.done();
2
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238 }
9
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diff changeset
239
3
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240 }
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diff changeset
241
2
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diff changeset
242
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243 // perhaps, package-local or protected, if anyone else from low-level needs them
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244 // XXX think over if we should keep offset in case of separate data file - we read the field anyway. Perhaps, distinct entry classes for Inline and non-inline indexes?
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245 private static class IndexEntry {
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246 public final long offset; // for separate .i and .d - copy of index record entry, for inline index - actual offset of the record in the .i file (record entry + revision * record size))
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247 //public final int length; // data past fixed record (need to decide whether including header size or not), and whether length is of compressed data or not
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248 public final int baseRevision;
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249
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250 public IndexEntry(long o, int baseRev) {
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251 offset = o;
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252 baseRevision = baseRev;
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253 }
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254 }
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255
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256 // mpatch.c : apply()
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257 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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258 private static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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259 byte[] tempBuf = new byte[outcomeLen]; // XXX
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260 int last = 0, destIndex = 0;
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261 for (PatchRecord pr : patch) {
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262 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, pr.start-last);
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263 destIndex += pr.start - last;
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264 System.arraycopy(pr.data, 0, tempBuf, destIndex, pr.data.length);
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265 destIndex += pr.data.length;
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266 last = pr.end;
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267 }
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268 System.arraycopy(baseRevisionContent, last, tempBuf, destIndex, baseRevisionContent.length - last);
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269 destIndex += baseRevisionContent.length - last; // total length
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270 byte[] rv = new byte[destIndex];
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271 System.arraycopy(tempBuf, 0, rv, 0, destIndex);
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272 return rv;
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273 }
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274
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275 static class PatchRecord { // copy of struct frag from mpatch.c
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276 int start, end, len;
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277 byte[] data;
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278
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279 public PatchRecord(int p1, int p2, int len, byte[] src, int srcOffset) {
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280 start = p1;
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281 end = p2;
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282 this.len = len;
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283 data = new byte[len];
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284 System.arraycopy(src, srcOffset, data, 0, len);
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285 }
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286 }
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287
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288 /*package-local*/ class DataAccess {
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289 public boolean nonEmpty() {
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290 return false;
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291 }
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292 // absolute positioning
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293 public void seek(long offset) throws IOException {
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294 throw new UnsupportedOperationException();
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295 }
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296 // relative positioning
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297 public void skip(int bytes) throws IOException {
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298 throw new UnsupportedOperationException();
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299 }
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300 // shall be called once this object no longer needed
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301 public void done() {
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302 // no-op in this empty implementation
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303 }
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304 public int readInt() throws IOException {
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305 byte[] b = new byte[4];
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306 readBytes(b, 0, 4);
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307 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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308 }
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309 public long readLong() throws IOException {
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310 byte[] b = new byte[8];
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311 readBytes(b, 0, 8);
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312 int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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313 int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
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314 return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFF);
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315 }
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316 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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317 throw new UnsupportedOperationException();
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318 }
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319 }
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320
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321 // DOESN'T WORK YET
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322 private class MemoryMapFileAccess extends DataAccess {
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323 private FileChannel fileChannel;
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324 private final long size;
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325 private long position = 0;
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326
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327 public MemoryMapFileAccess(FileChannel fc, long channelSize) {
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328 fileChannel = fc;
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329 size = channelSize;
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330 }
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331
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332 @Override
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333 public void seek(long offset) {
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334 position = offset;
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335 }
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336
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337 @Override
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338 public void skip(int bytes) throws IOException {
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339 position += bytes;
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340 }
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341
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342 private boolean fill() throws IOException {
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343 final int BUFFER_SIZE = 8 * 1024;
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344 long left = size - position;
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345 MappedByteBuffer rv = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < BUFFER_SIZE ? left : BUFFER_SIZE);
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346 position += rv.capacity();
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347 return rv.hasRemaining();
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348 }
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349
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350 @Override
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351 public void done() {
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352 if (fileChannel != null) {
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353 try {
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354 fileChannel.close();
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355 } catch (IOException ex) {
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356 ex.printStackTrace(); // log debug
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357 }
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diff changeset
358 fileChannel = null;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
359 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
360 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
361 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
362
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
363 private class FileAccess extends DataAccess {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
364 private FileChannel fileChannel;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
365 private final long size;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
366 private ByteBuffer buffer;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
367 private long bufferStartInFile = 0; // offset of this.buffer in the file.
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
368
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
369 public FileAccess(FileChannel fc, long channelSize) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
370 fileChannel = fc;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
371 size = channelSize;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
372 final int BUFFER_SIZE = 8 * 1024;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
373 // XXX once implementation is more or less stable,
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
374 // may want to try ByteBuffer.allocateDirect() to see
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
375 // if there's any performance gain.
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
376 buffer = ByteBuffer.allocate(size < BUFFER_SIZE ? (int) size : BUFFER_SIZE);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
377 buffer.flip(); // or .limit(0) to indicate it's empty
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
378 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
379
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
380 @Override
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
381 public boolean nonEmpty() {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
382 return bufferStartInFile + buffer.position() < size;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
383 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
384
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
385 @Override
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
386 public void seek(long offset) throws IOException {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
387 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
388 buffer.position((int) (offset - bufferStartInFile));
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
389 } else {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
390 // out of current buffer, invalidate it (force re-read)
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
391 // XXX or ever re-read it right away?
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
392 bufferStartInFile = offset;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
393 buffer.clear();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
394 buffer.limit(0); // or .flip() to indicate we switch to reading
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
395 fileChannel.position(offset);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
396 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
397 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
398
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
399 @Override
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
400 public void skip(int bytes) throws IOException {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
401 final int newPos = buffer.position() + bytes;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
402 if (newPos >= 0 && newPos < buffer.limit()) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
403 // no need to move file pointer, just rewind/seek buffer
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
404 buffer.position(newPos);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
405 } else {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
406 //
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
407 seek(fileChannel.position()+ bytes);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
408 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
409 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
410
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
411 private boolean fill() throws IOException {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
412 if (!buffer.hasRemaining()) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
413 bufferStartInFile += buffer.limit();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
414 buffer.clear();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
415 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
416 fileChannel.read(buffer);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
417 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
418 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
419 buffer.flip();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
420 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
421 return buffer.hasRemaining();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
422 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
423
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
424 @Override
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
425 public void readBytes(byte[] buf, int offset, int length) throws IOException {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
426 final int tail = buffer.remaining();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
427 if (tail >= length) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
428 buffer.get(buf, offset, length);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
429 } else {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
430 buffer.get(buf, offset, tail);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
431 if (fill()) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
432 buffer.get(buf, offset + tail, length - tail);
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
433 } else {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
434 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past nonEmpty() == false are made.
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
435 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
436 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
437 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
438
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
439 @Override
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
440 public void done() {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
441 if (buffer != null) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
442 buffer = null;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
443 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
444 if (fileChannel != null) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
445 try {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
446 fileChannel.close();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
447 } catch (IOException ex) {
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
448 ex.printStackTrace(); // log debug
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
449 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
450 fileChannel = null;
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
451 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
452 }
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
453 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
454 }