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Changed much of the mergetag structure and some functionality. First tests on windows. Changes to mergetag Reader methods. New functionality allowing a dataSecCreator to cause sections to be skipped. Moved several of the mergetag modules and some of their contents around. Moved all interfaces to separate modules in iface/ . IReader & IWriter interfaces exist; MTTReader, MTBReader, MTTWriter, MTBWriter & DualWriter all now exist and implement IReader/IWriter (although the MTB variants are dummy classes); makeReader & makeWriter should both be fully functional. Tested building on windows with partial success (works but window won't open). Included a temporary hack from windows to get supported resolutions information. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 07 Mar 2008 17:51:02 +0000
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children 4608be19ebe2
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14
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1 /**************************************************************************************************
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2 * This module contains all writing functions, for both binary and text MergeTag files.
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3 *
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4 * Files can be written in a text or binary form; binary is faster and smaller while text allows
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5 * editing with an ordinary text editor. TextWriter and BinaryWriter are the main classes, both of
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6 * which implement the interface IWriter. DualWriter is another class implementing IWriter, which
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7 * contains a private instance of a TextWriter and a BinaryWriter and implements all methods in the
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8 * interface simply by chaining the appropriate method from each of these classes, thus performing
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9 * two writes at once.
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10 *
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11 * Any of these three classes may be used directly, or makeWriter may be invoked to create an
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12 * instance of the appropriate class.
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13 *************************************************************************************************/
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14 module mde.mergetag.Writer;
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15
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16 // package imports
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17 public import mde.mergetag.iface.IWriter;
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18 import mde.mergetag.DataSet;
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19 import mde.mergetag.internal;
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20 import mde.mergetag.exception;
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21
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22 // tango imports
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23 import tango.core.Exception;
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24 import tango.io.FileConduit;
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25 import tango.io.Buffer : Buffer, IBuffer;
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26 import tango.io.Print : Print;
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27 import convInt = tango.text.convert.Integer;
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28 import tango.util.log.Log : Log, Logger;
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29
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30 private Logger logger;
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31 static this () {
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32 logger = Log.getLogger ("mde.mergetag.Writer");
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33 }
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34
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35
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36 /** Method to create and return either a MTTWriter or a MTBWriter.
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37 *
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38 * Has two modes of operation: if method is FromExtension, examines the existing extension and
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39 * creates a MTT/MTB writer if the extension is mtt or mtb (throwing if not).
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40 *
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41 * Otherwise, writing format is determined directly by method, and appropriate extensions are
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42 * added to the file name without checking for an existing extension.
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43 *
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44 * Params:
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45 * path = File path
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46 * dataset = Dataset passed to Writer to write from (if null, must be set before write() is called)
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47 * method = $(TABLE
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48 * $(TR $(TH Value) $(TH Writer returned) $(TH Suffix added))
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49 * $(TR $(TD FromExtension) $(TD MTBWriter or MTTWriter)$(TD $(I none)))
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50 * $(TR $(TD Binary) $(TD MTBWriter) $(TD .mtb))
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51 * $(TR $(TD Text) $(TD MTTWriter) $(TD .mtt))
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52 * $(TR $(TD Both) $(TD DualWriter) $(TD .mtb / .mtt))
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53 * )
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54 *
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55 * Throws:
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56 * MTFileFormatException if neither test can deduce the writing method, the supplied writing
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57 * method is invalid or the determined/supplied method is not yet implemented.
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58 *
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59 * Use as:
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60 * -----------------------
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61 * DataSet dataset; // contains data to write
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62 * IWriter foo;
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63 * try {
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64 * foo = makeWriter(...);
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65 * foo.write();
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66 * }
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67 * catch (MTException) {}
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68 * -----------------------
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69 * Where the makeWriter line has one of the following forms:
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70 * -----------------------
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71 * foo = makeWriter("foo.mtt", dataset);
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72 * foo = makeWriter("foo", dataset, WriterMethod.Text);
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73 * -----------------------
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74 *
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75 * Throws:
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76 * MTFileFormatException if unable to determine writing format or use requested format.
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77 */
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78 IWriter makeWriter (char[] path, DataSet dataset = null, WriterMethod method = WriterMethod.FromExtension) {
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79 if (method == WriterMethod.FromExtension) {
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80 PathView fpath = new FilePath (path);
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81
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82 if (fpath.ext == "mtt") return new MTTWriter (fpath, dataset);
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83 else if (fpath.ext == "mtb") return new MTBWriter (fpath, dataset);
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84 else {
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85 logger.error ("Unable to determine writing format: text or binary");
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86 throw new MTFileFormatException;
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87 }
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88 }
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89 else {
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90 if (method == WriterMethod.Binary) return new MTBWriter (path~".mtb", dataset);
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91 else if (method == WriterMethod.Text) return new MTTWriter (path~".mtt", dataset);
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92 else if (method == WriterMethod.Both) return new DualWriter (path, dataset);
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93 else throw new MTFileFormatException;
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94 }
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95 }
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96
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97
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98 /**
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99 * Class to write a dataset to a file.
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100 *
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101 * Files are only actually open for writing while the write() method is running.
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102 *
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103 * Throws:
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104 * $(TABLE
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105 * $(TR $(TH Exception) $(TH Thrown when))
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106 * $(TR $(TD MTNoDataSetException) $(TD No dataset is available to write from))
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107 * $(TR $(TD MTFileIOException) $(TD An error occurs while attemting to write the file))
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108 * $(TR $(TD MTException) $(TD An unexpected error occurs))
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109 * )
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110 * Note that all exceptions extend MTException; unlike Reader exceptions don't block further calls.
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111 */
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112 class MTTWriter : IWriter
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113 {
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114 //BEGIN DATA
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115 /// Get or set the DataSet (i.e. the container from which all data is written).
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116 DataSet dataset () { return _dataset; }
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117 void dataset (DataSet ds) /// ditto
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118 { _dataset = ds; }
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119
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120
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121 private:
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122 // taken from tango.io.Console, mostly to make sure notepad can read our files:
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123 version (Win32)
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124 const char[] Eol = "\r\n";
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125 else
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126 const char[] Eol = "\n";
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127
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128 /* The container where data is written from. */
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129 DataSet _dataset;
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130
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131 PathView _path;
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132 //END DATA
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133
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134 //BEGIN CTOR / DTOR
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135 /** Prepares to open file path for writing.
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136 *
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137 * The call doesn't actually execute any code so cannot fail (unless out of memory).
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138 *
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139 * Params:
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140 * path = The name or FilePath of the file to open.
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141 * Standard extensions are .mtt and .mtb for text and binary files respectively.
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142 * dataset_ = If null create a new DataSet, else use existing DataSet *dataset_ and merge read
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143 * data into it.
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144 */
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145 public this (char[] path, DataSet ds = null) {
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146 this (new FilePath (path), ds);
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147 }
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148 /** ditto */
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149 public this (PathView path, DataSet ds = null) {
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150 _path = path;
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151 _dataset = ds;
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152 }
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153 //END CTOR / DTOR
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154
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155 /** Writes the header and all DataSections.
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156 *
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157 * Firstly writes the header unless it has already been written. Then writes all DataSections
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158 * to the file. Thus if write is called more than once with or without changing the DataSet the
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159 * header should be written only once. This behaviour could, for instance, be used to write
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160 * multiple DataSets into one file without firstly merging them. Note that this behaviour may
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161 * be changed when binary support is added.
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162 */
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163 public void write ()
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164 {
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165 if (!_dataset) throwMTErr ("write(): no Dataset available to write from!", new MTNoDataSetException ());
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166
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167 try {
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168 FileConduit conduit; // actual conduit; don't use directly when there's content in the buffer
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169 IBuffer buffer; // write strings directly to this (use opCall(void[]) )
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170
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171 // Open a conduit on the file:
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172 conduit = new FileConduit (_path, FileConduit.WriteCreate);
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173 scope(exit) conduit.close();
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174
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175 buffer = new Buffer(conduit); // And a buffer
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176 scope(exit) buffer.flush();
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177
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178 // Write the header:
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179 buffer ("{MT" ~ MTFormatVersion.CurrentString ~ "}" ~ Eol);
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180 if (_dataset.header !is null) writeSection (buffer, _dataset.header);
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181
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182 // Write the rest:
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183 foreach (ID id, IDataSection sec; _dataset.sec) {
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184 writeSectionIdentifier (buffer, id);
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185 writeSection (buffer, sec);
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186 }
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187
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188 buffer.flush();
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189
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190 }
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191 catch (IOException e) {
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192 throwMTErr ("Error writing to file: " ~ e.msg, new MTFileIOException);
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193 }
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194 catch (Exception e) {
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195 throwMTErr ("Unexpected exception when writing file: " ~ e.msg);
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196 }
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197 }
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198
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199 private void writeSectionIdentifier (IBuffer buffer, ID id) {
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200 buffer ("{" ~ cast(char[])id ~ "}" ~ Eol);
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201 }
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202
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203 private void writeSection (IBuffer buffer, IDataSection sec) {
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204 void writeItem (char[] tp, ID id, char[] dt) { // actually writes an item
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205 buffer ("<" ~ tp ~ "|" ~ cast(char[])id ~"=" ~ dt ~ ">" ~ Eol);
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206 }
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207 sec.writeAll (&writeItem);
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208
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209 buffer (Eol); // blank line at end of each section
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210 }
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211
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212 private void throwMTErr (char[] msg, Exception exc = new MTException) {
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213 logger.error (msg); // report the error
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214 throw exc; // and signal our error
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215 }
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216 }
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217
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218 /*
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219 * Implement MTBWriter (and move both writers to own modules?).
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220 */
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221 class MTBWriter : IWriter {
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222 public this (char[] path, DataSet ds = null) {
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223 this (new FilePath (path), ds);
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224 }
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225 public this (PathView path, DataSet ds = null) {
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226 throw new MTNotImplementedException;
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227
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228 /+_path = path;
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229 _dataset = ds;+/
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230 }
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231
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232 DataSet dataset () {
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233 return null;
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234 }
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235 void dataset (DataSet) {}
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236
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237 void write () {}
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238 }
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239
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240 /* Basic implementation for mtt only.
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241 *
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242 *Implement std CTORs which add extensions to each filename and extra CTORs which take two filenames.
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243 */
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244 class DualWriter : IWriter {
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245 /** The individual writers.
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246 *
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247 * Potentially could be used directly, but I'd suggest not. */
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248 MTTWriter mtt;
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249 //MTBWriter mtb; /** ditto */
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250
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251 public this (char[] path, DataSet ds = null) {
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252 mtt = new MTTWriter (path~".mtt", ds);
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253 }
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254
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255 DataSet dataset () {
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256 return mtt.dataset;
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257 }
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258 void dataset (DataSet ds) {
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259 mtt.dataset = ds;
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260 }
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261
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262 /** Write.
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263 *
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264 * Write text then binary, so the mtb file will be the most recent.
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265 */
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266 void write () {
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267 mtt.write();
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268 }
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269 }