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  <h1>Source code for rdflib.plugins.sparql.aggregates</h1><div class="highlight"><pre>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Literal</span><span class="p">,</span> <span class="n">XSD</span>

<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.evalutils</span> <span class="kn">import</span> <span class="n">_eval</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.operators</span> <span class="kn">import</span> <span class="n">numeric</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.datatypes</span> <span class="kn">import</span> <span class="n">type_promotion</span>

<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.compat</span> <span class="kn">import</span> <span class="n">num_max</span><span class="p">,</span> <span class="n">num_min</span>

<span class="kn">from</span> <span class="nn">decimal</span> <span class="kn">import</span> <span class="n">Decimal</span>

<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">Aggregation functions</span>
<span class="sd">&quot;&quot;&quot;</span>


<span class="k">def</span> <span class="nf">_eval_rows</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">group</span><span class="p">):</span>
    <span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="k">yield</span> <span class="n">_eval</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">row</span><span class="p">)</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">pass</span>


<div class="viewcode-block" id="agg_Sum"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Sum">[docs]</a><span class="k">def</span> <span class="nf">agg_Sum</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>
    <span class="n">c</span> <span class="o">=</span> <span class="mi">0</span>

    <span class="n">dt</span> <span class="o">=</span> <span class="bp">None</span>
    <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">e</span> <span class="o">=</span> <span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
            <span class="n">n</span> <span class="o">=</span> <span class="n">numeric</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">dt</span> <span class="o">==</span> <span class="bp">None</span><span class="p">:</span>
                <span class="n">dt</span> <span class="o">=</span> <span class="n">e</span><span class="o">.</span><span class="n">datatype</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">dt</span> <span class="o">=</span> <span class="n">type_promotion</span><span class="p">(</span><span class="n">dt</span><span class="p">,</span> <span class="n">e</span><span class="o">.</span><span class="n">datatype</span><span class="p">)</span>

            <span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="o">==</span> <span class="nb">float</span> <span class="ow">and</span> <span class="nb">type</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="o">==</span> <span class="n">Decimal</span><span class="p">:</span>
                <span class="n">c</span> <span class="o">+=</span> <span class="nb">float</span><span class="p">(</span><span class="n">n</span><span class="p">)</span>
            <span class="k">elif</span> <span class="nb">type</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="o">==</span> <span class="nb">float</span> <span class="ow">and</span> <span class="nb">type</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="o">==</span> <span class="n">Decimal</span><span class="p">:</span>
                <span class="n">c</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="o">+</span> <span class="n">n</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">c</span> <span class="o">+=</span> <span class="n">n</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">pass</span>  <span class="c"># simply dont count</span>

    <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">datatype</span><span class="o">=</span><span class="n">dt</span><span class="p">)</span>

<span class="c"># Perhaps TODO: keep datatype for max/min?</span>

</div>
<div class="viewcode-block" id="agg_Min"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Min">[docs]</a><span class="k">def</span> <span class="nf">agg_Min</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>
    <span class="n">m</span> <span class="o">=</span> <span class="bp">None</span>

    <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">v</span> <span class="o">=</span> <span class="n">numeric</span><span class="p">(</span><span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">x</span><span class="p">))</span>
            <span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
                <span class="n">m</span> <span class="o">=</span> <span class="n">v</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">m</span> <span class="o">=</span> <span class="n">num_min</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">m</span><span class="p">)</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">return</span>  <span class="c"># error in aggregate =&gt; no binding</span>

    <span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">m</span><span class="p">)</span>

</div>
<div class="viewcode-block" id="agg_Max"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Max">[docs]</a><span class="k">def</span> <span class="nf">agg_Max</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>
    <span class="n">m</span> <span class="o">=</span> <span class="bp">None</span>

    <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">v</span> <span class="o">=</span> <span class="n">numeric</span><span class="p">(</span><span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">x</span><span class="p">))</span>
            <span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
                <span class="n">m</span> <span class="o">=</span> <span class="n">v</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">m</span> <span class="o">=</span> <span class="n">num_max</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">m</span><span class="p">)</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">return</span>  <span class="c"># error in aggregate =&gt; no binding</span>

    <span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">m</span><span class="p">)</span>

</div>
<div class="viewcode-block" id="agg_Count"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Count">[docs]</a><span class="k">def</span> <span class="nf">agg_Count</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>

    <span class="n">c</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">a</span><span class="o">.</span><span class="n">vars</span> <span class="o">!=</span> <span class="s">&#39;*&#39;</span><span class="p">:</span>
                <span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
            <span class="n">c</span> <span class="o">+=</span> <span class="mi">1</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">return</span>  <span class="c"># error in aggregate =&gt; no binding</span>
            <span class="c"># pass  # simply dont count</span>

    <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>

</div>
<div class="viewcode-block" id="agg_Sample"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Sample">[docs]</a><span class="k">def</span> <span class="nf">agg_Sample</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="nb">iter</span><span class="p">(</span><span class="n">group</span><span class="p">)</span><span class="o">.</span><span class="n">next</span><span class="p">())</span>
    <span class="k">except</span> <span class="ne">StopIteration</span><span class="p">:</span>
        <span class="k">pass</span>  <span class="c"># no res</span>

</div>
<div class="viewcode-block" id="agg_GroupConcat"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_GroupConcat">[docs]</a><span class="k">def</span> <span class="nf">agg_GroupConcat</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>

    <span class="n">sep</span> <span class="o">=</span> <span class="n">a</span><span class="o">.</span><span class="n">separator</span> <span class="ow">or</span> <span class="s">&quot; &quot;</span>

    <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span>
        <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">unicode</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">_eval_rows</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">group</span><span class="p">)))</span>

</div>
<div class="viewcode-block" id="agg_Avg"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.agg_Avg">[docs]</a><span class="k">def</span> <span class="nf">agg_Avg</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>

    <span class="n">c</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="n">s</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="n">dt</span> <span class="o">=</span> <span class="bp">None</span>
    <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">group</span><span class="p">:</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">e</span> <span class="o">=</span> <span class="n">_eval</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">vars</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
            <span class="n">n</span> <span class="o">=</span> <span class="n">numeric</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">dt</span> <span class="o">==</span> <span class="bp">None</span><span class="p">:</span>
                <span class="n">dt</span> <span class="o">=</span> <span class="n">e</span><span class="o">.</span><span class="n">datatype</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">dt</span> <span class="o">=</span> <span class="n">type_promotion</span><span class="p">(</span><span class="n">dt</span><span class="p">,</span> <span class="n">e</span><span class="o">.</span><span class="n">datatype</span><span class="p">)</span>

            <span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">==</span> <span class="nb">float</span> <span class="ow">and</span> <span class="nb">type</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="o">==</span> <span class="n">Decimal</span><span class="p">:</span>
                <span class="n">s</span> <span class="o">+=</span> <span class="nb">float</span><span class="p">(</span><span class="n">n</span><span class="p">)</span>
            <span class="k">elif</span> <span class="nb">type</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="o">==</span> <span class="nb">float</span> <span class="ow">and</span> <span class="nb">type</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">==</span> <span class="n">Decimal</span><span class="p">:</span>
                <span class="n">s</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">+</span> <span class="n">n</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">s</span> <span class="o">+=</span> <span class="n">n</span>
            <span class="n">c</span> <span class="o">+=</span> <span class="mi">1</span>
        <span class="k">except</span><span class="p">:</span>
            <span class="k">return</span>  <span class="c"># error in aggregate =&gt; no binding</span>

    <span class="k">if</span> <span class="n">c</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">dt</span> <span class="o">==</span> <span class="n">XSD</span><span class="o">.</span><span class="n">float</span> <span class="ow">or</span> <span class="n">dt</span> <span class="o">==</span> <span class="n">XSD</span><span class="o">.</span><span class="n">double</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">s</span> <span class="o">/</span> <span class="n">c</span><span class="p">)</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">bindings</span><span class="p">[</span><span class="n">a</span><span class="o">.</span><span class="n">res</span><span class="p">]</span> <span class="o">=</span> <span class="n">Literal</span><span class="p">(</span><span class="n">Decimal</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">/</span> <span class="n">Decimal</span><span class="p">(</span><span class="n">c</span><span class="p">))</span>

</div>
<div class="viewcode-block" id="evalAgg"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.aggregates.evalAgg">[docs]</a><span class="k">def</span> <span class="nf">evalAgg</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">):</span>
    <span class="k">if</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Count&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Count</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Sum&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Sum</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Sample&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Sample</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_GroupConcat&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_GroupConcat</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Avg&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Avg</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Min&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Min</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
    <span class="k">elif</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">&#39;Aggregate_Max&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">agg_Max</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>

    <span class="k">else</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">&quot;Unknown aggregate function &quot;</span> <span class="o">+</span> <span class="n">a</span><span class="o">.</span><span class="n">name</span><span class="p">)</span></div>
</pre></div>

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