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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 using System; |
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18 using System.IO; |
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19 using System.Text; |
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20 using System.Threading; |
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21 using System.Collections; |
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22 |
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23 namespace SymbianUtils |
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24 { |
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25 public abstract class AsyncBinaryFileReader : AsyncBinaryReaderBase |
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26 { |
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27 #region Construct & destruct |
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28 public AsyncBinaryFileReader( string aFileName ) |
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29 : this( aFileName, KDefaultReadChunkSize ) |
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30 { |
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31 } |
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32 |
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33 public AsyncBinaryFileReader( string aFileName, int aReadChunkSize ) |
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34 { |
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35 iSourceFileName = aFileName; |
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36 iReadChunkSize = aReadChunkSize; |
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37 } |
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38 #endregion |
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39 |
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40 #region Constants |
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41 public const int KDefaultReadChunkSize = 512; |
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42 #endregion |
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43 |
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44 #region Properties |
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45 public string FileName |
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46 { |
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47 get |
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48 { |
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49 string fileName = string.Empty; |
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50 // |
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51 lock( this ) |
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52 { |
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53 fileName = iSourceFileName; |
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54 } |
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55 // |
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56 return fileName; |
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57 } |
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58 } |
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59 |
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60 protected BinaryReader Reader |
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61 { |
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62 get { return iReader; } |
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63 } |
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64 #endregion |
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65 |
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66 #region New API |
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67 protected virtual void HandleReaderOpen() |
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68 { |
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69 } |
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70 #endregion |
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71 |
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72 #region From DisposableObject - Cleanup Framework |
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73 protected override void CleanupManagedResources() |
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74 { |
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75 try |
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76 { |
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77 Cleanup(); |
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78 } |
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79 finally |
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80 { |
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81 base.CleanupManagedResources(); |
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82 } |
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83 } |
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84 #endregion |
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85 |
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86 #region From AsyncReaderBase |
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87 protected override void HandleReadStarted() |
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88 { |
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89 iReader = new BinaryReader( new FileStream( FileName, FileMode.Open, FileAccess.Read ) ); |
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90 HandleReaderOpen(); |
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91 // |
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92 base.HandleReadStarted(); |
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93 } |
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94 |
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95 protected override void HandleReadCompleted() |
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96 { |
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97 try |
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98 { |
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99 Cleanup(); |
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100 } |
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101 finally |
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102 { |
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103 base.HandleReadCompleted(); |
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104 } |
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105 } |
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106 #endregion |
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107 |
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108 #region Abstract reading framework |
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109 protected override byte[] ProvideReadBytes() |
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110 { |
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111 byte[] ret = iReader.ReadBytes( iReadChunkSize ); |
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112 return ret; |
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113 } |
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114 |
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115 protected override long Size |
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116 { |
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117 get |
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118 { |
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119 long size = 0; |
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120 // |
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121 lock( this ) |
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122 { |
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123 if ( iReader != null && iReader.BaseStream != null ) |
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124 { |
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125 size = iReader.BaseStream.Length; |
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126 } |
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127 } |
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128 // |
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129 return size; |
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130 } |
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131 } |
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132 |
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133 protected override long Position |
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134 { |
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135 get |
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136 { |
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137 long position = 0; |
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138 // |
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139 lock( this ) |
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140 { |
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141 if ( iReader != null && iReader.BaseStream != null ) |
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142 { |
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143 position = iReader.BaseStream.Position; |
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144 } |
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145 } |
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146 // |
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147 return position; |
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148 } |
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149 } |
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150 #endregion |
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151 |
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152 #region Internal methods |
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153 private void Cleanup() |
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154 { |
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155 lock( this ) |
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156 { |
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157 if ( iReader != null ) |
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158 { |
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159 iReader.Close(); |
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160 iReader = null; |
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161 } |
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162 } |
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163 } |
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164 #endregion |
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165 |
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166 #region Data members |
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167 private BinaryReader iReader; |
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168 private readonly int iReadChunkSize; |
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169 private readonly string iSourceFileName; |
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170 #endregion |
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171 } |
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172 } |