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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 AsyncTextDataReader : AsyncTextReader |
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27 { |
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28 #region Enumerations |
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29 public enum TReadDirection |
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30 { |
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31 EReadDirectionForwards = 0, |
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32 EReadDirectionBackwards |
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33 } |
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34 #endregion |
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35 |
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36 #region Construct & destruct |
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37 protected AsyncTextDataReader( string[] aLines ) |
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38 : this( aLines, new AsyncTextReaderPrefix() ) |
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39 { |
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40 } |
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41 |
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42 protected AsyncTextDataReader( string[] aLines, ITracer aTracer ) |
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43 : this( aLines, new AsyncTextReaderPrefix(), aTracer ) |
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44 { |
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45 } |
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46 |
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47 protected AsyncTextDataReader( string[] aLines, AsyncTextReaderPrefix aPrefixes ) |
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48 : this( aLines, TReadDirection.EReadDirectionForwards, aPrefixes ) |
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49 { |
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50 } |
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51 |
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52 protected AsyncTextDataReader( string[] aLines, AsyncTextReaderPrefix aPrefixes, ITracer aTracer ) |
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53 : this( aLines, TReadDirection.EReadDirectionForwards, aPrefixes, aTracer ) |
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54 { |
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55 } |
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56 |
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57 protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection ) |
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58 : this( aLines, TReadDirection.EReadDirectionForwards, new AsyncTextReaderPrefix(), null ) |
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59 { |
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60 } |
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61 |
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62 protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, ITracer aTracer ) |
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63 : this( aLines, TReadDirection.EReadDirectionForwards, new AsyncTextReaderPrefix(), aTracer ) |
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64 { |
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65 } |
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66 |
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67 protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, AsyncTextReaderPrefix aPrefixes ) |
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68 : this( aLines, aReadDirection, aPrefixes, null ) |
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69 { |
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70 } |
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71 |
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72 protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, AsyncTextReaderPrefix aPrefixes, ITracer aTracer ) |
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73 : base( aPrefixes, aTracer ) |
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74 { |
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75 iLines = aLines; |
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76 iReadDirection = aReadDirection; |
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77 // |
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78 switch( iReadDirection ) |
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79 { |
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80 default: |
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81 case TReadDirection.EReadDirectionForwards: |
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82 iLineIndex = 0; |
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83 break; |
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84 case TReadDirection.EReadDirectionBackwards: |
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85 iLineIndex = iLines.Length - 1; |
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86 break; |
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87 } |
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88 } |
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89 #endregion |
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90 |
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91 #region Properties |
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92 public int LineNumber |
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93 { |
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94 get { return iLineIndex; } |
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95 } |
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96 #endregion |
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97 |
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98 #region Abstract reading framework |
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99 protected override int CalculateProgress() |
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100 { |
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101 int prog = 0; |
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102 // |
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103 switch( iReadDirection ) |
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104 { |
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105 default: |
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106 case TReadDirection.EReadDirectionForwards: |
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107 { |
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108 prog = base.CalculateProgress(); |
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109 break; |
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110 } |
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111 case TReadDirection.EReadDirectionBackwards: |
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112 { |
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113 float positionAsFloat = (float)Position; |
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114 float sizeAsFloat = (float)Size; |
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115 prog = (int)((positionAsFloat / sizeAsFloat) * 100.0); |
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116 prog = System.Math.Max(1, System.Math.Min(100, prog)); |
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117 break; |
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118 } |
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119 } |
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120 // |
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121 return prog; |
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122 } |
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123 |
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124 protected override string ProvideReadLine() |
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125 { |
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126 string ret = null; |
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127 // |
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128 switch( iReadDirection ) |
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129 { |
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130 default: |
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131 case TReadDirection.EReadDirectionForwards: |
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132 if ( iLineIndex < iLines.Length ) |
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133 { |
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134 ret = iLines[ iLineIndex++ ]; |
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135 } |
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136 break; |
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137 case TReadDirection.EReadDirectionBackwards: |
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138 if ( iLineIndex >= 0 ) |
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139 { |
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140 ret = iLines[ iLineIndex-- ]; |
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141 } |
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142 break; |
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143 } |
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144 // |
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145 return ret; |
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146 } |
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147 |
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148 protected override long Size |
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149 { |
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150 get |
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151 { |
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152 long size = iLines.LongLength; |
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153 return size; |
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154 } |
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155 } |
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156 |
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157 protected override long Position |
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158 { |
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159 get |
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160 { |
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161 long position = (long) iLineIndex; |
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162 return position; |
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163 } |
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164 } |
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165 #endregion |
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166 |
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167 #region Data members |
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168 private readonly string[] iLines; |
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169 private readonly TReadDirection iReadDirection; |
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170 private int iLineIndex = 0; |
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171 #endregion |
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172 } |
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173 } |