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annotate mde/file/mergetag/Writer.d @ 81:d8fccaa45d5f

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Moved file IO code from mde/mergetag to mde/file[/mergetag] and changed how some errors are caught.
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 29 Aug 2008 11:59:43 +0100
parents mde/mergetag/Writer.d@108d123238c0
children ac1e3fd07275
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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
26
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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.FileConduit;
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40 import tango.io.Buffer : Buffer, IBuffer;
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41 import tango.io.Print : Print;
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42 import convInt = tango.text.convert.Integer;
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43 import tango.util.log.Log : Log, Logger;
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44
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45 private Logger logger;
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46 static this () {
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47 logger = Log.getLogger ("mde.mergetag.Writer");
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48 }
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49
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50
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51 /** Method to create and return either a MTTWriter or a MTBWriter.
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52 *
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53 * Has two modes of operation: if method is FromExtension, examines the existing extension and
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54 * creates a MTT/MTB writer if the extension is mtt or mtb (throwing if not).
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55 *
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56 * Otherwise, writing format is determined directly by method, and appropriate extensions are
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57 * added to the file name without checking for an existing extension.
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58 *
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59 * Params:
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60 * path = File path
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61 * dataset = Dataset passed to Writer to write from (if null, must be set before write() is called)
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62 * method = $(TABLE
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63 * $(TR $(TH Value) $(TH Writer returned) $(TH Suffix added))
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64 * $(TR $(TD FromExtension) $(TD MTBWriter or MTTWriter)$(TD $(I none)))
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65 * $(TR $(TD Binary) $(TD MTBWriter) $(TD .mtb))
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66 * $(TR $(TD Text) $(TD MTTWriter) $(TD .mtt))
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67 * $(TR $(TD Both) $(TD DualWriter) $(TD .mtb / .mtt))
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68 * )
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69 *
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70 * Throws:
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71 * MTFileFormatException if neither test can deduce the writing method, the supplied writing
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72 * method is invalid or the determined/supplied method is not yet implemented.
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73 *
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74 * Use as:
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75 * -----------------------
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76 * DataSet dataset; // contains data to write
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77 * IWriter foo;
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78 * try {
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79 * foo = makeWriter(...);
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80 * foo.write();
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81 * }
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82 * catch (MTException) {}
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83 * -----------------------
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84 * Where the makeWriter line has one of the following forms:
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85 * -----------------------
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86 * foo = makeWriter("foo.mtt", dataset);
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87 * foo = makeWriter("foo", dataset, WriterMethod.Text);
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88 * -----------------------
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89 *
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90 * Throws:
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91 * MTFileFormatException if unable to determine writing format or use requested format.
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92 */
67
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93 //FIXME: separate functions for separate functionality, like in Reader?
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94 IWriter makeWriter (char[] path, DataSet dataset = null,
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95 WriterMethod method = WriterMethod.FromExtension) {
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96 if (method == WriterMethod.FromExtension) {
67
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97 if (path.length > 4 && path[$-4..$] == ".mtt")
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98 return new MTTWriter (path, dataset);
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99 else if (path.length > 4 && path[$-4..$] == ".mtb")
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100 return new MTBWriter (path, dataset);
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101 else {
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102 logger.error ("Unable to determine writing format: text or binary");
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103 throw new MTFileFormatException;
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104 }
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105 }
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106 else {
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107 if (method == WriterMethod.Binary) return new MTBWriter (path~".mtb", dataset);
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108 else if (method == WriterMethod.Text) return new MTTWriter (path~".mtt", dataset);
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109 else if (method == WriterMethod.Both) return new DualWriter (path, dataset);
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110 else throw new MTFileFormatException;
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111 }
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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 * Class to write a dataset to a file.
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117 *
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118 * Files are only actually open for writing while the write() method is running.
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119 *
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120 * Throws:
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121 * $(TABLE
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122 * $(TR $(TH Exception) $(TH Thrown when))
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123 * $(TR $(TD MTNoDataSetException) $(TD No dataset is available to write from))
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124 * $(TR $(TD MTFileIOException) $(TD An error occurs while attemting to write the file))
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125 * $(TR $(TD MTException) $(TD An unexpected error occurs))
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126 * )
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127 * Note that all exceptions extend MTException; unlike Reader exceptions don't block further calls.
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128 */
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129 class MTTWriter : IWriter
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130 {
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131 //BEGIN DATA
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132 /// Get or set the DataSet (i.e. the container from which all data is written).
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133 DataSet dataset () { return _dataset; }
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134 void dataset (DataSet ds) /// ditto
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135 { _dataset = ds; }
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136
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137
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138 private:
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139 // taken from tango.io.Console, mostly to make sure notepad can read our files:
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140 version (Win32)
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141 const char[] Eol = "\r\n";
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142 else
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143 const char[] Eol = "\n";
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144
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145 /* The container where data is written from. */
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146 DataSet _dataset;
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147
67
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148 char[] _path;
14
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149 //END DATA
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150
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151 //BEGIN CTOR / DTOR
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152 /** Prepares to open file path for writing.
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153 *
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154 * The call doesn't actually execute any code so cannot fail (unless out of memory).
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155 *
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156 * Params:
67
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157 * path = The name of the file to open.
14
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158 * Standard extensions are .mtt and .mtb for text and binary files respectively.
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159 * dataset_ = If null create a new DataSet, else use existing DataSet *dataset_ and merge read
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160 * data into it.
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161 */
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162 public this (char[] path, DataSet ds = null) {
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163 _path = path;
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164 _dataset = ds;
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165 }
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166 //END CTOR / DTOR
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167
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168 /** Writes the header and all DataSections.
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169 *
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170 * Firstly writes the header unless it has already been written. Then writes all DataSections
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171 * to the file. Thus if write is called more than once with or without changing the DataSet the
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172 * header should be written only once. This behaviour could, for instance, be used to write
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173 * multiple DataSets into one file without firstly merging them. Note that this behaviour may
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174 * be changed when binary support is added.
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175 */
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176 public void write ()
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177 {
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178 if (!_dataset) throwMTErr ("write(): no Dataset available to write from!", new MTNoDataSetException ());
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179
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180 try {
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181 FileConduit conduit; // actual conduit; don't use directly when there's content in the buffer
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182 IBuffer buffer; // write strings directly to this (use opCall(void[]) )
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183
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184 // Open a conduit on the file:
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185 conduit = new FileConduit (_path, FileConduit.WriteCreate);
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186 scope(exit) conduit.close();
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187
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188 buffer = new Buffer(conduit); // And a buffer
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189 scope(exit) buffer.flush();
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190
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191 // Write the header:
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192 buffer ("{MT" ~ MTFormatVersion.CurrentString ~ "}" ~ Eol);
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193 if (_dataset.header !is null) writeSection (buffer, _dataset.header);
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194
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195 // Write the rest:
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196 foreach (ID id, IDataSection sec; _dataset.sec) {
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197 writeSectionIdentifier (buffer, id);
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198 writeSection (buffer, sec);
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199 }
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200
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201 buffer.flush();
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202
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203 }
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204 catch (IOException e) {
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205 throwMTErr ("Error writing to file: " ~ e.msg, new MTFileIOException);
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206 }
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207 catch (Exception e) {
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208 throwMTErr ("Unexpected exception when writing file: " ~ e.msg);
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209 }
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210 }
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211
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212 private void writeSectionIdentifier (IBuffer buffer, ID id) {
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213 buffer ("{" ~ cast(char[])id ~ "}" ~ Eol);
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214 }
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215
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216 private void writeSection (IBuffer buffer, IDataSection sec) {
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217 void writeItem (char[] tp, ID id, char[] dt) { // actually writes an item
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218 buffer ("<" ~ tp ~ "|" ~ cast(char[])id ~"=" ~ dt ~ ">" ~ Eol);
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219 }
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220 sec.writeAll (&writeItem);
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221
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222 buffer (Eol); // blank line at end of each section
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223 }
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224
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225 private void throwMTErr (char[] msg, Exception exc = new MTException) {
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226 logger.error (msg); // report the error
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227 throw exc; // and signal our error
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228 }
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229 }
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230
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231 /*
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232 * Implement MTBWriter (and move both writers to own modules?).
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233 */
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234 class MTBWriter : IWriter {
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235 public this (char[] path, DataSet ds = null) {
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236 throw new MTNotImplementedException;
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237
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238 /+_path = path;
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239 _dataset = ds;+/
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240 }
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241
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242 DataSet dataset () {
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243 return null;
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244 }
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245 void dataset (DataSet) {}
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246
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247 void write () {}
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248 }
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249
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250 /* Basic implementation for mtt only.
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251 *
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252 *Implement std CTORs which add extensions to each filename and extra CTORs which take two filenames.
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253 */
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254 class DualWriter : IWriter {
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255 /** The individual writers.
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256 *
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257 * Potentially could be used directly, but there should be no need. */
14
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258 MTTWriter mtt;
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259 //MTBWriter mtb; /** ditto */
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260
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261 public this (char[] path, DataSet ds = null) {
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262 mtt = new MTTWriter (path~".mtt", ds);
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263 }
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264
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265 DataSet dataset () {
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266 return mtt.dataset;
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267 }
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268 void dataset (DataSet ds) {
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269 mtt.dataset = ds;
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270 }
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271
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272 /** Write.
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273 *
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274 * Write text then binary, so the mtb file will be the most recent.
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275 */
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276 void write () {
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277 mtt.write();
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278 }
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279 }