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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 using SymbianUtils.Tracer; |
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23 |
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24 namespace SymbianUtils |
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25 { |
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26 public abstract class AsyncTextReaderBase : AsyncReaderBase |
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27 { |
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28 #region Constructors |
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29 protected AsyncTextReaderBase() |
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30 : this( null ) |
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31 { |
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32 } |
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33 |
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34 protected AsyncTextReaderBase( ITracer aTracer ) |
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35 : base( aTracer ) |
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36 { |
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37 } |
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38 #endregion |
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39 |
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40 #region Properties |
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41 protected bool TrimLine |
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42 { |
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43 get { return iTrimLine; } |
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44 set { iTrimLine = value; } |
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45 } |
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46 #endregion |
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47 |
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48 #region Read handlers |
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49 protected virtual bool ContinueProcessing() |
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50 { |
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51 return false; |
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52 } |
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53 |
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54 protected virtual bool ImmediateAbort() |
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55 { |
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56 return false; |
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57 } |
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58 |
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59 protected virtual void HandleReadLine( string aLine ) |
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60 { |
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61 } |
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62 #endregion |
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63 |
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64 #region Framework API |
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65 protected abstract string ProvideReadLine(); |
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66 |
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67 protected virtual void OnProgressChanged( int aProgress ) |
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68 { |
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69 NotifyEvent( TEvent.EReadingProgress ); |
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70 } |
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71 #endregion |
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72 |
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73 #region Internal constants |
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74 private const int KProgressCheckGranularity = 500; |
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75 #endregion |
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76 |
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77 #region Internal methods |
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78 protected override void PerformOperation() |
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79 { |
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80 bool forcedContinue = false; |
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81 bool immediateAbort = false; |
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82 string line; |
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83 // |
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84 lock( this ) |
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85 { |
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86 line = ProvideReadLine(); |
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87 forcedContinue = ContinueProcessing(); |
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88 immediateAbort = ImmediateAbort(); |
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89 } |
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90 |
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91 System.DateTime tenPercentTime = DateTime.Now; |
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92 |
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93 int newProgress = 0; |
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94 int oldProgress = 0; |
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95 int progressTracker = 0; |
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96 |
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97 while ( ( line != null || forcedContinue ) && !immediateAbort ) |
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98 { |
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99 if ( line != null && TrimLine ) |
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100 { |
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101 line = line.Trim(); |
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102 } |
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103 // |
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104 lock( this ) |
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105 { |
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106 HandleReadLine( line ); |
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107 } |
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108 // |
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109 lock( this ) |
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110 { |
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111 if ( progressTracker == KProgressCheckGranularity ) |
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112 { |
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113 newProgress = Progress; |
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114 progressTracker = 0; |
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115 } |
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116 |
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117 ++progressTracker; |
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118 } |
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119 if ( newProgress != oldProgress ) |
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120 { |
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121 #if DEBUG |
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122 if ( newProgress > 0 && ( newProgress % 10 ) == 0 ) |
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123 { |
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124 System.DateTime now = DateTime.Now; |
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125 long intermediateTickDuration = ( ( now.Ticks - tenPercentTime.Ticks ) / 100 ); |
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126 System.Diagnostics.Debug.WriteLine( newProgress.ToString( "d2" ) + " % COMPLETE - " + intermediateTickDuration.ToString( "d12" ) ); |
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127 tenPercentTime = now; |
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128 } |
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129 #endif |
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130 OnProgressChanged( newProgress ); |
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131 oldProgress = newProgress; |
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132 } |
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133 // |
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134 lock( this ) |
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135 { |
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136 line = ProvideReadLine(); |
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137 forcedContinue = ContinueProcessing(); |
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138 immediateAbort = ImmediateAbort(); |
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139 } |
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140 } |
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141 |
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142 System.DateTime endTime = DateTime.Now; |
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143 long tickDuration = ( ( endTime.Ticks - iOperationStartTime.Ticks ) / 100 ); |
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144 System.Diagnostics.Debug.WriteLine( "TEXT READ COMPLETE - " + tickDuration.ToString( "d12" ) ); |
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145 } |
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146 #endregion |
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147 |
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148 #region Data members |
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149 private bool iTrimLine = true; |
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150 #endregion |
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151 } |
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152 } |