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1 /*******************************************************************************
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2
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3 copyright: Copyright (c) 2007 Kris Bell. All rights reserved
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4
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5 license: BSD style: $(LICENSE)
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6
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7 version: Initial release: Nov 2007
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8
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9 author: Kris
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10
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11 Streams to expose simple native types as discrete elements. I/O
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12 is buffered and should yield fair performance.
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13
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14 *******************************************************************************/
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15
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16 module tango.io.stream.TypedStream;
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17
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18 private import tango.io.Buffer,
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19 tango.io.Conduit;
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20
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21 /*******************************************************************************
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22
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23 Type T is the target or destination type
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24
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25 *******************************************************************************/
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26
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27 class TypedInput(T) : InputFilter, Buffered
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28 {
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29 private IBuffer input;
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30
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31 /***********************************************************************
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32
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33 ***********************************************************************/
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34
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35 this (InputStream stream)
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36 {
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37 super (input = Buffer.share (stream));
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38 }
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39
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40 /***********************************************************************
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41
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42 Buffered interface
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43
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44 ***********************************************************************/
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45
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46 final IBuffer buffer ()
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47 {
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48 return input;
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49 }
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50
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51 /***********************************************************************
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52
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53 Override this to give back a useful chaining reference
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54
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55 ***********************************************************************/
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56
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57 final override TypedInput clear ()
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58 {
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59 host.clear;
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60 return this;
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61 }
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62
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63 /***********************************************************************
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64
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65 Read a value from the stream. Returns false when all
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66 content has been consumed
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67
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68 ***********************************************************************/
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69
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70 final bool read (inout T x)
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71 {
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72 return input.read((&x)[0..1]) is T.sizeof;
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73 }
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74
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75 /***********************************************************************
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76
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77 Iterate over all content
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78
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79 ***********************************************************************/
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80
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81 final int opApply (int delegate(ref T x) dg)
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82 {
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83 T x;
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84 int ret;
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85
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86 while ((input.read((&x)[0..1]) is T.sizeof))
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87 if ((ret = dg (x)) != 0)
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88 break;
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89 return ret;
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90 }
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91 }
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92
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93
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94
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95 /*******************************************************************************
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96
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97 Type T is the target or destination type.
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98
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99 *******************************************************************************/
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100
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101 class TypedOutput (T) : OutputFilter, Buffered
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102 {
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103 private IBuffer output;
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104
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105 /***********************************************************************
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106
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107 ***********************************************************************/
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108
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109 this (OutputStream stream)
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110 {
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111 super (output = Buffer.share (stream));
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112 }
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113
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114 /***********************************************************************
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115
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116 Buffered interface
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117
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118 ***********************************************************************/
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119
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120 final IBuffer buffer ()
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121 {
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122 return output;
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123 }
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124
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125 /***********************************************************************
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126
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127 Append a value to the output stream
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128
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129 ***********************************************************************/
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130
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131 final void write (T x)
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132 {
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133 output.append (&x, T.sizeof);
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134 }
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135 }
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136
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137
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138 /*******************************************************************************
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139
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140 *******************************************************************************/
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141
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142 debug (UnitTest)
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143 {
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144 import tango.io.Stdout;
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145 import tango.io.stream.UtfStream;
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146
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147 unittest
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148 {
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149 auto inp = new TypedInput!(char)(new Buffer("hello world"));
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150 auto oot = new TypedOutput!(char)(new Buffer(20));
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151
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152 foreach (x; inp)
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153 oot.write (x);
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154 assert (oot.buffer.slice == "hello world");
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155
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156 auto xx = new TypedInput!(char)(new UtfInput!(char, dchar)(new Buffer("hello world"d)));
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157 char[] yy;
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158 foreach (x; xx)
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159 yy ~= x;
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160 assert (yy == "hello world");
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161 }
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162 }
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