Mercurial > projects > mde
annotate mde/file/mergetag/Writer.d @ 137:9f035cd139c6
BIG commit. Major change: old Options class is gone, all content values are loaded and saved automatically. All options updated to reflect this, some changed.
Content restrutured a lot:
New IContent module, Content module includes more functionality.
New ContentLoader module to manage content loading/saving/translation.
Translation module moved to content dir and cut down to reflect current usage.
File format unchanged except renames: FontOptions -> Font, VideoOptions -> Screen.
Font render mode and LCD filter options are now enums.
GUI loading needs to create content (and set type for enums), but doesn't save/load value.
Some setup of mainSchedule moved to mde.mainLoop.
Content callbacks are called on content change now.
ContentLists are set up implicitly from content symbols. Not as fast but much easier!
Bug-fix in the new MTTagReader.
Renamed MT *Reader maker functions to avoid confusion in paths.d.
New mde.setup.logger module to allow logger setup before any other module's static this().
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Sat, 07 Feb 2009 12:46:03 +0000 |
parents | 4084f07f2c7a |
children | e785e98d3b78 |
rev | line source |
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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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15 |
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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.Buffer; |
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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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47 |
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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 |
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140 char[] _path; |
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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. |
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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 { |
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173 scope File conduit; // actual conduit; don't use directly when there's content in the buffer |
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174 scope BufferOutput 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 |
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180 buffer = new BufferOutput(conduit); // And a buffer |
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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 } |
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192 |
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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 |
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204 private void writeSectionIdentifier (BufferOutput buffer, ID id) { |
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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 (BufferOutput buffer, IDataSection sec) { |
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209 void writeItem (char[] tp, ID id, char[] dt) { // actually writes an item |
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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 |
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214 buffer.append (Eol); // blank line at end of each section |
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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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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 } |