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annotate mde/file/mergetag/Writer.d @ 151:e785e98d3b78

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Updated for compatibility with tango 0.99.8.
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 04 Apr 2009 17:32:18 +0200
parents 9f035cd139c6
children
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5f90774ea1ef Applied the GNU GPL v2 to mde.
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16 /**************************************************************************************************
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17 * This module contains all writing functions, for both binary and text MergeTag files.
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18 *
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19 * Files can be written in a text or binary form; binary is faster and smaller while text allows
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20 * editing with an ordinary text editor. TextWriter and BinaryWriter are the main classes, both of
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21 * which implement the interface IWriter. DualWriter is another class implementing IWriter, which
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22 * contains a private instance of a TextWriter and a BinaryWriter and implements all methods in the
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23 * interface simply by chaining the appropriate method from each of these classes, thus performing
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24 * two writes at once.
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25 *
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26 * Any of these three classes may be used directly, or makeWriter may be invoked to create an
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27 * instance of the appropriate class.
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28 *************************************************************************************************/
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29 module mde.file.mergetag.Writer;
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30
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31 // package imports
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32 public import mde.file.mergetag.iface.IWriter;
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33 import mde.file.mergetag.DataSet;
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34 import mde.file.mergetag.internal;
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35 import mde.file.mergetag.exception;
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36
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37 // tango imports
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38 import tango.core.Exception;
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39 import tango.io.device.File;
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40 import tango.io.stream.Buffered;
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41 import tango.util.log.Log : Log, Logger;
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42
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43 private Logger logger;
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44 static this () {
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45 logger = Log.getLogger ("mde.file.mergetag.Writer");
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46 }
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48
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49 /** Method to create and return either a MTTWriter or a MTBWriter.
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50 *
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51 * Has two modes of operation: if method is FromExtension, examines the existing extension and
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52 * creates a MTT/MTB writer if the extension is mtt or mtb (throwing if not).
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53 *
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54 * Otherwise, writing format is determined directly by method, and appropriate extensions are
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55 * added to the file name without checking for an existing extension.
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56 *
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57 * Params:
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58 * path = File path
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59 * dataset = Dataset passed to Writer to write from (if null, must be set before write() is called)
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60 * method = $(TABLE
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61 * $(TR $(TH Value) $(TH Writer returned) $(TH Suffix added))
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62 * $(TR $(TD FromExtension) $(TD MTBWriter or MTTWriter)$(TD $(I none)))
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63 * $(TR $(TD Binary) $(TD MTBWriter) $(TD .mtb))
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64 * $(TR $(TD Text) $(TD MTTWriter) $(TD .mtt))
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65 * $(TR $(TD Both) $(TD DualWriter) $(TD .mtb / .mtt))
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66 * )
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67 *
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68 * Throws:
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69 * MTFileFormatException if neither test can deduce the writing method, the supplied writing
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70 * method is invalid or the determined/supplied method is not yet implemented.
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71 *
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72 * Use as:
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73 * -----------------------
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74 * DataSet dataset; // contains data to write
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75 * IWriter foo;
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76 * try {
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77 * foo = makeWriter(...);
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78 * foo.write();
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79 * }
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80 * catch (MTException) {}
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81 * -----------------------
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82 * Where the makeWriter line has one of the following forms:
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83 * -----------------------
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84 * foo = makeWriter("foo.mtt", dataset);
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85 * foo = makeWriter("foo", dataset, WriterMethod.Text);
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86 * -----------------------
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87 *
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88 * Throws:
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89 * MTFileFormatException if unable to determine writing format or use requested format.
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90 */
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91 //FIXME: separate functions for separate functionality, like in Reader?
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92 IWriter getMTWriter (char[] path, DataSet dataset = null,
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93 WriterMethod method = WriterMethod.FromExtension) {
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94 if (method == WriterMethod.FromExtension) {
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95 if (path.length > 4 && path[$-4..$] == ".mtt")
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96 return new MTTWriter (path, dataset);
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97 else if (path.length > 4 && path[$-4..$] == ".mtb")
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98 return new MTBWriter (path, dataset);
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99 else {
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100 logger.error ("Unable to determine writing format: text or binary");
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101 throw new MTFileFormatException;
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102 }
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103 }
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104 else {
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105 if (method == WriterMethod.Binary) return new MTBWriter (path~".mtb", dataset);
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106 else if (method == WriterMethod.Text) return new MTTWriter (path~".mtt", dataset);
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107 else if (method == WriterMethod.Both) return new DualWriter (path, dataset);
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108 else throw new MTFileFormatException;
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109 }
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110 }
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111
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112
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113 /**
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114 * Class to write a dataset to a file.
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115 *
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116 * Files are only actually open for writing while the write() method is running.
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117 *
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118 * Throws:
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119 * $(TABLE
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120 * $(TR $(TH Exception) $(TH Thrown when))
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121 * $(TR $(TD MTNoDataSetException) $(TD No dataset is available to write from))
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122 * $(TR $(TD MTFileIOException) $(TD An error occurs while attemting to write the file))
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123 * $(TR $(TD MTException) $(TD An unexpected error occurs))
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124 * )
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125 * Note that all exceptions extend MTException; unlike Reader exceptions don't block further calls.
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126 */
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127 class MTTWriter : IWriter
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128 {
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129 //BEGIN DATA
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130 /// Get or set the DataSet (i.e. the container from which all data is written).
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131 DataSet dataset () { return _dataset; }
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132 void dataset (DataSet ds) /// ditto
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133 { _dataset = ds; }
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134
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135
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136 private:
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137 /* The container where data is written from. */
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138 DataSet _dataset;
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139
67
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140 char[] _path;
14
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141 //END DATA
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142
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143 //BEGIN CTOR / DTOR
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144 /** Prepares to open file path for writing.
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145 *
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146 * The call doesn't actually execute any code so cannot fail (unless out of memory).
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147 *
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148 * Params:
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149 * path = The name of the file to open.
14
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150 * Standard extensions are .mtt and .mtb for text and binary files respectively.
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151 * dataset_ = If null create a new DataSet, else use existing DataSet *dataset_ and merge read
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152 * data into it.
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153 */
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154 public this (char[] path, DataSet ds = null) {
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155 _path = path;
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156 _dataset = ds;
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157 }
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158 //END CTOR / DTOR
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159
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160 /** Writes the header and all DataSections.
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161 *
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162 * Firstly writes the header unless it has already been written. Then writes all DataSections
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163 * to the file. Thus if write is called more than once with or without changing the DataSet the
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164 * header should be written only once. This behaviour could, for instance, be used to write
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165 * multiple DataSets into one file without firstly merging them. Note that this behaviour may
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166 * be changed when binary support is added.
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167 */
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168 public void write ()
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169 {
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170 if (!_dataset) throwMTErr ("write(): no Dataset available to write from!", new MTNoDataSetException ());
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171
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172 try {
114
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173 scope File conduit; // actual conduit; don't use directly when there's content in the buffer
151
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174 scope BufferedOutput buffer; // write strings directly to this (use opCall(void[]) )
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175
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176 // Open a conduit on the file:
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177 conduit = new File (_path, File.WriteCreate);
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178 scope(exit) conduit.close();
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179
151
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180 buffer = new BufferedOutput(conduit); // And a buffer
14
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181 scope(exit) buffer.flush();
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182
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183 // Write the header:
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184 buffer.append ("{" ~ CurrentVersionString ~ "}" ~ Eol);
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185 if (_dataset.header !is null) writeSection (buffer, _dataset.header);
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186
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187 // Write the rest:
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188 foreach (ID id, IDataSection sec; _dataset.sec) {
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189 writeSectionIdentifier (buffer, id);
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190 writeSection (buffer, sec);
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191 }
85
56c0ddd90193 Intermediate commit (not stable). Changes to init system.
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192
14
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193 buffer.flush();
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194
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195 }
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196 catch (IOException e) {
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197 throwMTErr ("Error writing to file: " ~ e.msg, new MTFileIOException);
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198 }
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199 catch (Exception e) {
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200 throwMTErr ("Unexpected exception when writing file: " ~ e.msg);
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201 }
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202 }
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203
151
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204 private void writeSectionIdentifier (BufferedOutput buffer, ID id) {
136
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205 buffer.append ("{" ~ id ~ "}" ~ Eol);
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206 }
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207
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208 private void writeSection (BufferedOutput buffer, IDataSection sec) {
14
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209 void writeItem (char[] tp, ID id, char[] dt) { // actually writes an item
136
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210 buffer.append ("<" ~ tp ~ "|" ~ id ~"=" ~ dt ~ ">" ~ Eol);
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211 }
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212 sec.writeAll (&writeItem);
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213
114
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214 buffer.append (Eol); // blank line at end of each section
14
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215 }
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216
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217 private void throwMTErr (char[] msg, Exception exc = new MTException) {
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218 logger.error (msg); // report the error
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219 throw exc; // and signal our error
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220 }
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221 }
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222
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223 /*
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224 * Implement MTBWriter (and move both writers to own modules?).
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225 */
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226 class MTBWriter : IWriter {
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227 public this (char[] path, DataSet ds = null) {
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228 throw new MTNotImplementedException;
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229
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230 /+_path = path;
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231 _dataset = ds;+/
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232 }
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233
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234 DataSet dataset () {
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235 return null;
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236 }
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237 void dataset (DataSet) {}
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238
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239 void write () {}
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240 }
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241
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242 /* Basic implementation for mtt only.
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243 *
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244 *Implement std CTORs which add extensions to each filename and extra CTORs which take two filenames.
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245 */
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246 class DualWriter : IWriter {
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247 /** The individual writers.
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248 *
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4608be19ebe2 Use OS paths (linux only for now), merging multiple paths. Init changes regarding options.
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249 * Potentially could be used directly, but there should be no need. */
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250 MTTWriter mtt;
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251 //MTBWriter mtb; /** ditto */
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252
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253 public this (char[] path, DataSet ds = null) {
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254 mtt = new MTTWriter (path~".mtt", ds);
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255 }
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256
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257 DataSet dataset () {
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258 return mtt.dataset;
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259 }
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260 void dataset (DataSet ds) {
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261 mtt.dataset = ds;
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262 }
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263
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264 /** Write.
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265 *
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266 * Write text then binary, so the mtb file will be the most recent.
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267 */
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268 void write () {
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269 mtt.write();
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270 }
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271 }