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56  <div class="section" id="loader">
57<h1>loader<a class="headerlink" href="#loader" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-DataLoader.loader">
59<span id="dataloader-loader"></span><h2><a class="reference internal" href="#module-DataLoader.loader" title="DataLoader.loader"><tt class="xref py py-mod docutils literal"><span class="pre">DataLoader.loader</span></tt></a><a class="headerlink" href="#module-DataLoader.loader" title="Permalink to this headline">¶</a></h2>
60<p>File handler to support different file extensions.
61Uses reflectometry&#8217;s registry utility.</p>
62<p>The default readers are found in the &#8216;readers&#8217; sub-module
63and registered by default at initialization time.</p>
64<p>To add a new default reader, one must register it in
65the register_readers method found in readers/__init__.py.</p>
66<p>A utility method (find_plugins) is available to inspect
67a directory (for instance, a user plug-in directory) and
68look for new readers/writers.</p>
69<dl class="class">
70<dt id="DataLoader.loader.Loader">
71<em class="property">class </em><tt class="descclassname">DataLoader.loader.</tt><tt class="descname">Loader</tt><a class="headerlink" href="#DataLoader.loader.Loader" title="Permalink to this definition">¶</a></dt>
72<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">object</span></tt></p>
73<p>Utility class to use the Registry as a singleton.</p>
74<dl class="method">
75<dt id="DataLoader.loader.Loader.associate_file_reader">
76<tt class="descname">associate_file_reader</tt><big>(</big><em>ext</em>, <em>loader</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.associate_file_reader" title="Permalink to this definition">¶</a></dt>
77<dd><p>Append a reader object to readers</p>
78<table class="docutils field-list" frame="void" rules="none">
79<col class="field-name" />
80<col class="field-body" />
81<tbody valign="top">
82<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
83<li><strong>ext</strong> &#8211; file extension [string]</li>
84<li><strong>module</strong> &#8211; reader object</li>
85</ul>
86</td>
87</tr>
88</tbody>
89</table>
90</dd></dl>
91
92<dl class="method">
93<dt id="DataLoader.loader.Loader.associate_file_type">
94<tt class="descname">associate_file_type</tt><big>(</big><em>ext</em>, <em>module</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.associate_file_type" title="Permalink to this definition">¶</a></dt>
95<dd><p>Look into a module to find whether it contains a
96Reader class. If so, append it to readers and (potentially)
97to the list of writers for the given extension</p>
98<table class="docutils field-list" frame="void" rules="none">
99<col class="field-name" />
100<col class="field-body" />
101<tbody valign="top">
102<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
103<li><strong>ext</strong> &#8211; file extension [string]</li>
104<li><strong>module</strong> &#8211; module object</li>
105</ul>
106</td>
107</tr>
108</tbody>
109</table>
110</dd></dl>
111
112<dl class="method">
113<dt id="DataLoader.loader.Loader.find_plugins">
114<tt class="descname">find_plugins</tt><big>(</big><em>dir</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.find_plugins" title="Permalink to this definition">¶</a></dt>
115<dd><p>Find plugins in a given directory</p>
116<table class="docutils field-list" frame="void" rules="none">
117<col class="field-name" />
118<col class="field-body" />
119<tbody valign="top">
120<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>dir</strong> &#8211; directory to look into to find new readers/writers</td>
121</tr>
122</tbody>
123</table>
124</dd></dl>
125
126<dl class="method">
127<dt id="DataLoader.loader.Loader.get_wildcards">
128<tt class="descname">get_wildcards</tt><big>(</big><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.get_wildcards" title="Permalink to this definition">¶</a></dt>
129<dd></dd></dl>
130
131<dl class="method">
132<dt id="DataLoader.loader.Loader.load">
133<tt class="descname">load</tt><big>(</big><em>file</em>, <em>format=None</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.load" title="Permalink to this definition">¶</a></dt>
134<dd><p>Load a file</p>
135<table class="docutils field-list" frame="void" rules="none">
136<col class="field-name" />
137<col class="field-body" />
138<tbody valign="top">
139<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
140<li><strong>file</strong> &#8211; file name (path)</li>
141<li><strong>format</strong> &#8211; specified format to use (optional)</li>
142</ul>
143</td>
144</tr>
145<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">DataInfo object</p>
146</td>
147</tr>
148</tbody>
149</table>
150</dd></dl>
151
152<dl class="method">
153<dt id="DataLoader.loader.Loader.save">
154<tt class="descname">save</tt><big>(</big><em>file</em>, <em>data</em>, <em>format</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Loader.save" title="Permalink to this definition">¶</a></dt>
155<dd><p>Save a DataInfo object to file
156:param file: file name (path)
157:param data: DataInfo object
158:param format: format to write the data in</p>
159</dd></dl>
160
161</dd></dl>
162
163<dl class="class">
164<dt id="DataLoader.loader.Registry">
165<em class="property">class </em><tt class="descclassname">DataLoader.loader.</tt><tt class="descname">Registry</tt><a class="headerlink" href="#DataLoader.loader.Registry" title="Permalink to this definition">¶</a></dt>
166<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">data_util.registry.ExtensionRegistry</span></tt></p>
167<p>Registry class for file format extensions.
168Readers and writers are supported.</p>
169<dl class="method">
170<dt id="DataLoader.loader.Registry.associate_file_reader">
171<tt class="descname">associate_file_reader</tt><big>(</big><em>ext</em>, <em>loader</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.associate_file_reader" title="Permalink to this definition">¶</a></dt>
172<dd><p>Append a reader object to readers</p>
173<table class="docutils field-list" frame="void" rules="none">
174<col class="field-name" />
175<col class="field-body" />
176<tbody valign="top">
177<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
178<li><strong>ext</strong> &#8211; file extension [string]</li>
179<li><strong>module</strong> &#8211; reader object</li>
180</ul>
181</td>
182</tr>
183</tbody>
184</table>
185</dd></dl>
186
187<dl class="method">
188<dt id="DataLoader.loader.Registry.associate_file_type">
189<tt class="descname">associate_file_type</tt><big>(</big><em>ext</em>, <em>module</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.associate_file_type" title="Permalink to this definition">¶</a></dt>
190<dd><p>Look into a module to find whether it contains a
191Reader class. If so, APPEND it to readers and (potentially)
192to the list of writers for the given extension</p>
193<table class="docutils field-list" frame="void" rules="none">
194<col class="field-name" />
195<col class="field-body" />
196<tbody valign="top">
197<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
198<li><strong>ext</strong> &#8211; file extension [string]</li>
199<li><strong>module</strong> &#8211; module object</li>
200</ul>
201</td>
202</tr>
203</tbody>
204</table>
205</dd></dl>
206
207<dl class="method">
208<dt id="DataLoader.loader.Registry.extensions">
209<tt class="descname">extensions</tt><big>(</big><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.extensions" title="Permalink to this definition">¶</a></dt>
210<dd><p>Return a sorted list of registered extensions.</p>
211</dd></dl>
212
213<dl class="method">
214<dt id="DataLoader.loader.Registry.find_plugins">
215<tt class="descname">find_plugins</tt><big>(</big><em>dir</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.find_plugins" title="Permalink to this definition">¶</a></dt>
216<dd><p>Find readers in a given directory. This method
217can be used to inspect user plug-in directories to
218find new readers/writers.</p>
219<table class="docutils field-list" frame="void" rules="none">
220<col class="field-name" />
221<col class="field-body" />
222<tbody valign="top">
223<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>dir</strong> &#8211; directory to search into</td>
224</tr>
225<tr class="field"><th class="field-name">Returns:</th><td class="field-body">number of readers found</td>
226</tr>
227</tbody>
228</table>
229</dd></dl>
230
231<dl class="method">
232<dt id="DataLoader.loader.Registry.formats">
233<tt class="descname">formats</tt><big>(</big><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.formats" title="Permalink to this definition">¶</a></dt>
234<dd><p>Return a sorted list of the registered formats.</p>
235</dd></dl>
236
237<dl class="method">
238<dt id="DataLoader.loader.Registry.load">
239<tt class="descname">load</tt><big>(</big><em>path</em>, <em>format=None</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.load" title="Permalink to this definition">¶</a></dt>
240<dd><p>Call the loader for the file type of path.</p>
241<table class="docutils field-list" frame="void" rules="none">
242<col class="field-name" />
243<col class="field-body" />
244<tbody valign="top">
245<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
246<li><strong>path</strong> &#8211; file path</li>
247<li><strong>format</strong> &#8211; explicit extension, to force the use
248of a particular reader</li>
249</ul>
250</td>
251</tr>
252</tbody>
253</table>
254<p>Defaults to the ascii (multi-column) reader
255if no reader was registered for the file&#8217;s
256extension.</p>
257</dd></dl>
258
259<dl class="method">
260<dt id="DataLoader.loader.Registry.lookup">
261<tt class="descname">lookup</tt><big>(</big><em>path</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.lookup" title="Permalink to this definition">¶</a></dt>
262<dd><p>Return the loader associated with the file type of path.</p>
263<p>Raises ValueError if file type is not known.</p>
264</dd></dl>
265
266<dl class="method">
267<dt id="DataLoader.loader.Registry.lookup_writers">
268<tt class="descname">lookup_writers</tt><big>(</big><em>path</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.lookup_writers" title="Permalink to this definition">¶</a></dt>
269<dd><table class="docutils field-list" frame="void" rules="none">
270<col class="field-name" />
271<col class="field-body" />
272<tbody valign="top">
273<tr class="field"><th class="field-name">Returns:</th><td class="field-body">the loader associated with the file type of path.</td>
274</tr>
275<tr class="field"><th class="field-name" colspan="2">Raises ValueError:</th></tr>
276<tr><td>&nbsp;</td><td class="field-body">if file type is not known.</td>
277</tr>
278</tbody>
279</table>
280</dd></dl>
281
282<dl class="method">
283<dt id="DataLoader.loader.Registry.save">
284<tt class="descname">save</tt><big>(</big><em>path</em>, <em>data</em>, <em>format=None</em><big>)</big><a class="headerlink" href="#DataLoader.loader.Registry.save" title="Permalink to this definition">¶</a></dt>
285<dd><p>Call the writer for the file type of path.</p>
286<p>Raises ValueError if no writer is available.
287Raises KeyError if format is not available.</p>
288<p>May raise a writer-defined exception if writer fails.</p>
289</dd></dl>
290
291</dd></dl>
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