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<h2 title="Class QueryAlgebraUtil" class="title">Class QueryAlgebraUtil</h2>
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<li>java.lang.Object</li>
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<pre>public class <a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.57">QueryAlgebraUtil</a>
extends java.lang.Object</pre>
<div class="block">Various static functions for query handling and parsing (alegbra expression).</div>
<dl><dt><span class="strong">Author:</span></dt>
  <dd>Andreas Schwarte</dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<tr class="altColor">
<td class="colFirst"><code>static org.apache.log4j.Logger</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#log">log</a></strong></code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#QueryAlgebraUtil()">QueryAlgebraUtil</a></strong>()</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static org.openrdf.model.Value</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#getVarValue(org.openrdf.query.algebra.Var, org.openrdf.query.BindingSet)">getVarValue</a></strong>(org.openrdf.query.algebra.Var&nbsp;var,
                      org.openrdf.query.BindingSet&nbsp;bindings)</code>
<div class="block">Return the <code>Value</code> of the variable which is either taken from
 the variable itself (bound) or from the bindingsset (unbound).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#hasFreeVars(org.openrdf.query.algebra.StatementPattern, org.openrdf.query.BindingSet)">hasFreeVars</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                      org.openrdf.query.BindingSet&nbsp;bindings)</code>
<div class="block">returns true iff there is at least one free variable, i.e.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQuery(com.fluidops.fedx.algebra.ExclusiveGroup, org.openrdf.query.BindingSet, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">selectQuery</a></strong>(<a href="../../../../com/fluidops/fedx/algebra/ExclusiveGroup.html" title="class in com.fluidops.fedx.algebra">ExclusiveGroup</a>&nbsp;group,
                      org.openrdf.query.BindingSet&nbsp;bindings,
                      <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                      java.lang.Boolean&nbsp;evaluated)</code>
<div class="block">Construct a SELECT query for the provided <a href="../../../../com/fluidops/fedx/algebra/ExclusiveGroup.html" title="class in com.fluidops.fedx.algebra"><code>ExclusiveGroup</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQuery(org.openrdf.query.algebra.StatementPattern, org.openrdf.query.BindingSet, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">selectQuery</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                      org.openrdf.query.BindingSet&nbsp;bindings,
                      <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                      java.lang.Boolean&nbsp;evaluated)</code>
<div class="block">Construct a SELECT query for the provided statement.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQueryBoundUnion(org.openrdf.query.algebra.StatementPattern, java.util.List, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">selectQueryBoundUnion</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                          java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;unionBindings,
                                          <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                                          java.lang.Boolean&nbsp;evaluated)</code>
<div class="block">Construct a SELECT query expression for a bound union.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQueryIndependentJoinGroup(com.fluidops.fedx.algebra.IndependentJoinGroup, org.openrdf.query.BindingSet)">selectQueryIndependentJoinGroup</a></strong>(<a href="../../../../com/fluidops/fedx/algebra/IndependentJoinGroup.html" title="class in com.fluidops.fedx.algebra">IndependentJoinGroup</a>&nbsp;joinGroup,
                                                              org.openrdf.query.BindingSet&nbsp;bindings)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQueryIndependentJoinGroup(com.fluidops.fedx.algebra.IndependentJoinGroup, java.util.List)">selectQueryIndependentJoinGroup</a></strong>(<a href="../../../../com/fluidops/fedx/algebra/IndependentJoinGroup.html" title="class in com.fluidops.fedx.algebra">IndependentJoinGroup</a>&nbsp;joinGroup,
                                                              java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;bindings)</code>
<div class="block">Construct a select query representing a bound independent join group.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.TupleExpr</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#selectQueryStringBoundCheck(org.openrdf.query.algebra.StatementPattern, java.util.List)">selectQueryStringBoundCheck</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                                      java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;unionBindings)</code>
<div class="block">Construct a SELECT query for a grouped bound check.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.openrdf.model.Statement</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#toStatement(org.openrdf.query.algebra.StatementPattern)">toStatement</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static org.openrdf.model.Statement</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#toStatement(org.openrdf.query.algebra.StatementPattern, org.openrdf.query.BindingSet)">toStatement</a></strong>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                      org.openrdf.query.BindingSet&nbsp;bindings)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.StatementPattern</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#toStatementPattern(org.openrdf.model.Resource, org.openrdf.model.URI, org.openrdf.model.Value)">toStatementPattern</a></strong>(org.openrdf.model.Resource&nbsp;subj,
                                    org.openrdf.model.URI&nbsp;pred,
                                    org.openrdf.model.Value&nbsp;obj)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static org.openrdf.query.algebra.StatementPattern</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/util/QueryAlgebraUtil.html#toStatementPattern(org.openrdf.model.Statement)">toStatementPattern</a></strong>(org.openrdf.model.Statement&nbsp;stmt)</code>&nbsp;</td>
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<code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>log</h4>
<pre>public static&nbsp;org.apache.log4j.Logger <a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.59">log</a></pre>
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<h4>QueryAlgebraUtil</h4>
<pre>public&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.57">QueryAlgebraUtil</a>()</pre>
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<pre>public static&nbsp;boolean&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.69">hasFreeVars</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                  org.openrdf.query.BindingSet&nbsp;bindings)</pre>
<div class="block">returns true iff there is at least one free variable, i.e. there is no binding
 for any variable</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>stmt</code> - </dd><dd><code>bindings</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
</li>
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<a name="getVarValue(org.openrdf.query.algebra.Var, org.openrdf.query.BindingSet)">
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<h4>getVarValue</h4>
<pre>public static&nbsp;org.openrdf.model.Value&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.88">getVarValue</a>(org.openrdf.query.algebra.Var&nbsp;var,
                                  org.openrdf.query.BindingSet&nbsp;bindings)</pre>
<div class="block">Return the <code>Value</code> of the variable which is either taken from
 the variable itself (bound) or from the bindingsset (unbound).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>var</code> - </dd><dd><code>bindings</code> - the bindings, must not be null, use <code>EmptyBindingSet</code> instead</dd>
<dt><span class="strong">Returns:</span></dt><dd>the value or null</dd></dl>
</li>
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<a name="toStatementPattern(org.openrdf.model.Statement)">
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<h4>toStatementPattern</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.StatementPattern&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.99">toStatementPattern</a>(org.openrdf.model.Statement&nbsp;stmt)</pre>
</li>
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<h4>toStatementPattern</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.StatementPattern&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.103">toStatementPattern</a>(org.openrdf.model.Resource&nbsp;subj,
                                                            org.openrdf.model.URI&nbsp;pred,
                                                            org.openrdf.model.Value&nbsp;obj)</pre>
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<a name="toStatement(org.openrdf.query.algebra.StatementPattern)">
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<h4>toStatement</h4>
<pre>public static&nbsp;org.openrdf.model.Statement&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.112">toStatement</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt)</pre>
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<h4>toStatement</h4>
<pre>public static&nbsp;org.openrdf.model.Statement&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.116">toStatement</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                      org.openrdf.query.BindingSet&nbsp;bindings)</pre>
</li>
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<a name="selectQuery(org.openrdf.query.algebra.StatementPattern, org.openrdf.query.BindingSet, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">
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<h4>selectQuery</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.139">selectQuery</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                              org.openrdf.query.BindingSet&nbsp;bindings,
                                              <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                                              java.lang.Boolean&nbsp;evaluated)
                                                       throws <a href="../../../../com/fluidops/fedx/exception/IllegalQueryException.html" title="class in com.fluidops.fedx.exception">IllegalQueryException</a></pre>
<div class="block">Construct a SELECT query for the provided statement.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>stmt</code> - </dd><dd><code>bindings</code> - </dd><dd><code>filterExpr</code> - </dd><dd><code>evaluated</code> - parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning</dd>
<dt><span class="strong">Returns:</span></dt><dd></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/IllegalQueryException.html" title="class in com.fluidops.fedx.exception">IllegalQueryException</a></code></dd></dl>
</li>
</ul>
<a name="selectQuery(com.fluidops.fedx.algebra.ExclusiveGroup, org.openrdf.query.BindingSet, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">
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<h4>selectQuery</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.180">selectQuery</a>(<a href="../../../../com/fluidops/fedx/algebra/ExclusiveGroup.html" title="class in com.fluidops.fedx.algebra">ExclusiveGroup</a>&nbsp;group,
                                              org.openrdf.query.BindingSet&nbsp;bindings,
                                              <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                                              java.lang.Boolean&nbsp;evaluated)</pre>
<div class="block">Construct a SELECT query for the provided <a href="../../../../com/fluidops/fedx/algebra/ExclusiveGroup.html" title="class in com.fluidops.fedx.algebra"><code>ExclusiveGroup</code></a>. Note that bindings
 and filterExpr are applied whenever possible.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>group</code> - the expression for the query</dd><dd><code>bindings</code> - the bindings to be applied</dd><dd><code>filterExpr</code> - a filter expression or null</dd><dd><code>evaluated</code> - parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning</dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
</li>
</ul>
<a name="selectQueryBoundUnion(org.openrdf.query.algebra.StatementPattern, java.util.List, com.fluidops.fedx.algebra.FilterValueExpr, java.lang.Boolean)">
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<h4>selectQueryBoundUnion</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.241">selectQueryBoundUnion</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                                        java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;unionBindings,
                                                        <a href="../../../../com/fluidops/fedx/algebra/FilterValueExpr.html" title="interface in com.fluidops.fedx.algebra">FilterValueExpr</a>&nbsp;filterExpr,
                                                        java.lang.Boolean&nbsp;evaluated)</pre>
<div class="block">Construct a SELECT query expression for a bound union.
 
 Pattern:
 
 SELECT ?v_1 ?v_2 ?v_N WHERE { { ?v_1 p o } UNION { ?v_2 p o } UNION ... } 
 
 Note that the filterExpr is not evaluated at the moment.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>stmt</code> - </dd><dd><code>unionBindings</code> - </dd><dd><code>filterExpr</code> - </dd><dd><code>evaluated</code> - parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning</dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
</li>
</ul>
<a name="selectQueryStringBoundCheck(org.openrdf.query.algebra.StatementPattern, java.util.List)">
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<h4>selectQueryStringBoundCheck</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.280">selectQueryStringBoundCheck</a>(org.openrdf.query.algebra.StatementPattern&nbsp;stmt,
                                                              java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;unionBindings)</pre>
<div class="block">Construct a SELECT query for a grouped bound check.
 
 Pattern:
 
 SELECT DISTINCT ?o_1 .. ?o_N WHERE { { s1 p1 ?o_1 FILTER ?o_1=o1 } UNION ... UNION { sN pN ?o_N FILTER ?o_N=oN }}</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>stmt</code> - </dd><dd><code>unionBindings</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
</li>
</ul>
<a name="selectQueryIndependentJoinGroup(com.fluidops.fedx.algebra.IndependentJoinGroup, org.openrdf.query.BindingSet)">
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<h4>selectQueryIndependentJoinGroup</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.306">selectQueryIndependentJoinGroup</a>(<a href="../../../../com/fluidops/fedx/algebra/IndependentJoinGroup.html" title="class in com.fluidops.fedx.algebra">IndependentJoinGroup</a>&nbsp;joinGroup,
                                                                  org.openrdf.query.BindingSet&nbsp;bindings)</pre>
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<h4>selectQueryIndependentJoinGroup</h4>
<pre>public static&nbsp;org.openrdf.query.algebra.TupleExpr&nbsp;<a href="../../../../src-html/com/fluidops/fedx/util/QueryAlgebraUtil.html#line.358">selectQueryIndependentJoinGroup</a>(<a href="../../../../com/fluidops/fedx/algebra/IndependentJoinGroup.html" title="class in com.fluidops.fedx.algebra">IndependentJoinGroup</a>&nbsp;joinGroup,
                                                                  java.util.List&lt;org.openrdf.query.BindingSet&gt;&nbsp;bindings)</pre>
<div class="block">Construct a select query representing a bound independent join group.
 
 ?v_%stmt%#%bindingId$
 
 SELECT ?v_0_0 ?v_0_1 ?v_1_0 ... 
        WHERE { 
                { ?v_0#0 p o UNION ?v_0_1 p o UNION ... } 
                UNION 
                { ?v_1_0 p o UNION ?v_1_1 p o UNION ... } 
      UNION
      ...
  }</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>joinGroup</code> - </dd><dd><code>bindings</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
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