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<h1>Source code for rdflib.plugins.sparql.results.jsonlayer</h1><div class="highlight"><pre>
<span class="c"># -*- coding: utf-8 -*-</span>
<span class="c">#</span>
<span class="c"># Copyright (C) 2009 Christopher Lenz</span>
<span class="c"># All rights reserved.</span>
<span class="c">#</span>
<span class="c"># Redistribution and use in source and binary forms, with or without</span>
<span class="c"># modification, are permitted provided that the following conditions</span>
<span class="c"># are met:</span>
<span class="c"># 1. Redistributions of source code must retain the above copyright</span>
<span class="c"># notice, this list of conditions and the following disclaimer.</span>
<span class="c"># 2. Redistributions in binary form must reproduce the above copyright</span>
<span class="c"># notice, this list of conditions and the following disclaimer in</span>
<span class="c"># the documentation and/or other materials provided with the</span>
<span class="c"># distribution.</span>
<span class="c"># 3. The name of the author may not be used to endorse or promote</span>
<span class="c"># products derived from this software without specific prior</span>
<span class="c"># written permission.</span>
<span class="c"># THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS</span>
<span class="c"># OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
<span class="c"># WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<span class="c"># ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span>
<span class="c"># DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
<span class="c"># DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span>
<span class="c"># GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<span class="c"># INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER</span>
<span class="c"># IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR</span>
<span class="c"># OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN</span>
<span class="c"># IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<span class="sd">"""Thin abstraction layer over the different available modules for decoding</span>
<span class="sd">and encoding JSON data.</span>
<span class="sd">This module currently supports the following JSON modules:</span>
<span class="sd"> - ``simplejson``: http://code.google.com/p/simplejson/</span>
<span class="sd"> - ``cjson``: http://pypi.python.org/pypi/python-cjson</span>
<span class="sd"> - ``json``: This is the version of ``simplejson`` that is bundled with the</span>
<span class="sd"> Python standard library since version 2.6</span>
<span class="sd"> (see http://docs.python.org/library/json.html)</span>
<span class="sd">The default behavior is to use ``simplejson`` if installed, and otherwise</span>
<span class="sd">fallback to the standard library module. To explicitly tell SPARQLWrapper</span>
<span class="sd">which module to use, invoke the `use()` function with the module name::</span>
<span class="sd"> import jsonlayer</span>
<span class="sd"> jsonlayer.use('cjson')</span>
<span class="sd">In addition to choosing one of the above modules, you can also configure</span>
<span class="sd">SPARQLWrapper to use custom decoding and encoding functions::</span>
<span class="sd"> import jsonlayer</span>
<span class="sd"> jsonlayer.use(decode=my_decode, encode=my_encode)</span>
<span class="sd">"""</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">'decode'</span><span class="p">,</span> <span class="s">'encode'</span><span class="p">,</span> <span class="s">'use'</span><span class="p">]</span>
<span class="n">_initialized</span> <span class="o">=</span> <span class="bp">False</span>
<span class="n">_using</span> <span class="o">=</span> <span class="bp">None</span>
<span class="n">_decode</span> <span class="o">=</span> <span class="bp">None</span>
<span class="n">_encode</span> <span class="o">=</span> <span class="bp">None</span>
<div class="viewcode-block" id="decode"><a class="viewcode-back" href="../../../../../apidocs/rdflib.plugins.sparql.results.html#rdflib.plugins.sparql.results.jsonlayer.decode">[docs]</a><span class="k">def</span> <span class="nf">decode</span><span class="p">(</span><span class="n">string</span><span class="p">):</span>
<span class="sd">"""Decode the given JSON string.</span>
<span class="sd"> :param string: the JSON string to decode</span>
<span class="sd"> :type string: basestring</span>
<span class="sd"> :return: the corresponding Python data structure</span>
<span class="sd"> :rtype: object</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">_initialized</span><span class="p">:</span>
<span class="n">_initialize</span><span class="p">()</span>
<span class="k">return</span> <span class="n">_decode</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="encode"><a class="viewcode-back" href="../../../../../apidocs/rdflib.plugins.sparql.results.html#rdflib.plugins.sparql.results.jsonlayer.encode">[docs]</a><span class="k">def</span> <span class="nf">encode</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span>
<span class="sd">"""Encode the given object as a JSON string.</span>
<span class="sd"> :param obj: the Python data structure to encode</span>
<span class="sd"> :type obj: object</span>
<span class="sd"> :return: the corresponding JSON string</span>
<span class="sd"> :rtype: basestring</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">_initialized</span><span class="p">:</span>
<span class="n">_initialize</span><span class="p">()</span>
<span class="k">return</span> <span class="n">_encode</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="use"><a class="viewcode-back" href="../../../../../apidocs/rdflib.plugins.sparql.results.html#rdflib.plugins.sparql.results.jsonlayer.use">[docs]</a><span class="k">def</span> <span class="nf">use</span><span class="p">(</span><span class="n">module</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">decode</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">encode</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""Set the JSON library that should be used, either by specifying a known</span>
<span class="sd"> module name, or by providing a decode and encode function.</span>
<span class="sd"> The modules "simplejson", "cjson", and "json" are currently supported for</span>
<span class="sd"> the ``module`` parameter.</span>
<span class="sd"> If provided, the ``decode`` parameter must be a callable that accepts a</span>
<span class="sd"> JSON string and returns a corresponding Python data structure. The</span>
<span class="sd"> ``encode`` callable must accept a Python data structure and return the</span>
<span class="sd"> corresponding JSON string. Exceptions raised by decoding and encoding</span>
<span class="sd"> should be propagated up unaltered.</span>
<span class="sd"> :param module: the name of the JSON library module to use, or the module</span>
<span class="sd"> object itself</span>
<span class="sd"> :type module: str or module</span>
<span class="sd"> :param decode: a function for decoding JSON strings</span>
<span class="sd"> :type decode: callable</span>
<span class="sd"> :param encode: a function for encoding objects as JSON strings</span>
<span class="sd"> :type encode: callable</span>
<span class="sd"> """</span>
<span class="k">global</span> <span class="n">_decode</span><span class="p">,</span> <span class="n">_encode</span><span class="p">,</span> <span class="n">_initialized</span><span class="p">,</span> <span class="n">_using</span>
<span class="k">if</span> <span class="n">module</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="nb">basestring</span><span class="p">):</span>
<span class="n">module</span> <span class="o">=</span> <span class="n">module</span><span class="o">.</span><span class="n">__name__</span>
<span class="k">if</span> <span class="n">module</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">(</span><span class="s">'cjson'</span><span class="p">,</span> <span class="s">'json'</span><span class="p">,</span> <span class="s">'simplejson'</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">'Unsupported JSON module </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">module</span><span class="p">)</span>
<span class="n">_using</span> <span class="o">=</span> <span class="n">module</span>
<span class="n">_initialized</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">assert</span> <span class="n">decode</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span> <span class="ow">and</span> <span class="n">encode</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span>
<span class="n">_using</span> <span class="o">=</span> <span class="s">'custom'</span>
<span class="n">_decode</span> <span class="o">=</span> <span class="n">decode</span>
<span class="n">_encode</span> <span class="o">=</span> <span class="n">encode</span>
<span class="n">_initialized</span> <span class="o">=</span> <span class="bp">True</span>
</div>
<span class="k">def</span> <span class="nf">_initialize</span><span class="p">():</span>
<span class="k">global</span> <span class="n">_initialized</span>
<span class="k">def</span> <span class="nf">_init_simplejson</span><span class="p">():</span>
<span class="k">global</span> <span class="n">_decode</span><span class="p">,</span> <span class="n">_encode</span>
<span class="kn">import</span> <span class="nn">simplejson</span>
<span class="n">_decode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">string</span><span class="p">,</span> <span class="n">loads</span><span class="o">=</span><span class="n">simplejson</span><span class="o">.</span><span class="n">loads</span><span class="p">:</span> <span class="n">loads</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<span class="n">_encode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">obj</span><span class="p">,</span> <span class="n">dumps</span><span class="o">=</span><span class="n">simplejson</span><span class="o">.</span><span class="n">dumps</span><span class="p">:</span> \
<span class="n">dumps</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">allow_nan</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span> <span class="n">ensure_ascii</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_init_cjson</span><span class="p">():</span>
<span class="k">global</span> <span class="n">_decode</span><span class="p">,</span> <span class="n">_encode</span>
<span class="kn">import</span> <span class="nn">cjson</span>
<span class="n">_decode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">string</span><span class="p">,</span> <span class="n">decode</span><span class="o">=</span><span class="n">cjson</span><span class="o">.</span><span class="n">decode</span><span class="p">:</span> <span class="n">decode</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<span class="n">_encode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">obj</span><span class="p">,</span> <span class="n">encode</span><span class="o">=</span><span class="n">cjson</span><span class="o">.</span><span class="n">encode</span><span class="p">:</span> <span class="n">encode</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_init_stdlib</span><span class="p">():</span>
<span class="k">global</span> <span class="n">_decode</span><span class="p">,</span> <span class="n">_encode</span>
<span class="n">json</span> <span class="o">=</span> <span class="nb">__import__</span><span class="p">(</span><span class="s">'json'</span><span class="p">,</span> <span class="p">{},</span> <span class="p">{})</span>
<span class="n">_decode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">string</span><span class="p">,</span> <span class="n">loads</span><span class="o">=</span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">:</span> <span class="n">loads</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<span class="n">_encode</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">obj</span><span class="p">,</span> <span class="n">dumps</span><span class="o">=</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">:</span> \
<span class="n">dumps</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">allow_nan</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span> <span class="n">ensure_ascii</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">if</span> <span class="n">_using</span> <span class="o">==</span> <span class="s">'simplejson'</span><span class="p">:</span>
<span class="n">_init_simplejson</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">_using</span> <span class="o">==</span> <span class="s">'cjson'</span><span class="p">:</span>
<span class="n">_init_cjson</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">_using</span> <span class="o">==</span> <span class="s">'json'</span><span class="p">:</span>
<span class="n">_init_stdlib</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">_using</span> <span class="o">!=</span> <span class="s">'custom'</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">_init_simplejson</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">_init_stdlib</span><span class="p">()</span>
<span class="n">_initialized</span> <span class="o">=</span> <span class="bp">True</span>
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