arq/org.apache.jena.arq/org/apache/jena/sparql/expr/ExprLib.html - jena-site - Git at Google

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 <div class="sub-title"><span class="module-label-in-type">Module</span>&nbsp;<a href="../../../../../module-summary.html">org.apache.jena.arq</a></div>
 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.jena.sparql.expr</a></div>
 <h1 title="Class ExprLib" class="title">Class ExprLib</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
 <div class="inheritance">org.apache.jena.sparql.expr.ExprLib</div>
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 <section class="class-description" id="class-description">
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 <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">ExprLib</span>
 <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
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 <section class="summary">
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 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
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 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">ExprLib</a>()</code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 </div>
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 <!-- ========== METHOD SUMMARY =========== -->
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 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel">
 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="NodeValue.html" title="class in org.apache.jena.sparql.expr">NodeValue</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#evalOrNull(org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.engine.binding.Binding,org.apache.jena.sparql.function.FunctionEnv)" class="member-name-link">evalOrNull</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr,
  <a href="../engine/binding/Binding.html" title="interface in org.apache.jena.sparql.engine.binding">Binding</a>&nbsp;binding,
  <a href="../function/FunctionEnv.html" title="interface in org.apache.jena.sparql.function">FunctionEnv</a>&nbsp;functionEnv)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Evaluate or return null.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#foldConstants(org.apache.jena.sparql.expr.Expr)" class="member-name-link">foldConstants</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Attempt to fold any sub-expressions of the Expr.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isAssignmentSafeEquality(org.apache.jena.sparql.expr.Expr)" class="member-name-link">isAssignmentSafeEquality</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Decide whether an expression is safe for using a graph substitution.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isAssignmentSafeEquality(org.apache.jena.sparql.expr.Expr,boolean,boolean)" class="member-name-link">isAssignmentSafeEquality</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr,
  boolean&nbsp;graphHasStringEquality,
  boolean&nbsp;graphHasNumercialValueEquality)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isStable(org.apache.jena.sparql.expr.Expr)" class="member-name-link">isStable</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Some "functions" are non-deterministic (unstable) -
  calling them with the same arguments
  does not yields the same answer each time.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#nodeToExpr(org.apache.jena.graph.Node)" class="member-name-link">nodeToExpr</a><wbr>(org.apache.jena.graph.Node&nbsp;n)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Go from a node to an expression.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#replaceAggregateByVariable(org.apache.jena.sparql.expr.Expr)" class="member-name-link">replaceAggregateByVariable</a><wbr>(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">transform an expression that may involve aggregates into one that just uses the variable for the aggregate</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#rewriteTriple(org.apache.jena.graph.Triple)" class="member-name-link">rewriteTriple</a><wbr>(org.apache.jena.graph.Triple&nbsp;t)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;()">
 <h3>ExprLib</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">ExprLib</span>()</div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="evalOrNull(org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.engine.binding.Binding,org.apache.jena.sparql.function.FunctionEnv)">
 <h3>evalOrNull</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="NodeValue.html" title="class in org.apache.jena.sparql.expr">NodeValue</a></span>&nbsp;<span class="element-name">evalOrNull</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr,
  <a href="../engine/binding/Binding.html" title="interface in org.apache.jena.sparql.engine.binding">Binding</a>&nbsp;binding,
  <a href="../function/FunctionEnv.html" title="interface in org.apache.jena.sparql.function">FunctionEnv</a>&nbsp;functionEnv)</span></div>
 <div class="block">Evaluate or return null.
  <p>
  This is better (faster) than the simple implementation
  which captures <a href="ExprEvalException.html" title="class in org.apache.jena.sparql.expr"><code>ExprEvalException</code></a> and returns null.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="foldConstants(org.apache.jena.sparql.expr.Expr)">
 <h3>foldConstants</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></span>&nbsp;<span class="element-name">foldConstants</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</span></div>
 <div class="block">Attempt to fold any sub-expressions of the Expr.
  Return an expression that is equivalent to the argument but maybe simpler.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>expr</code> - </dd>
 <dt>Returns:</dt>
 <dd>Expression</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="replaceAggregateByVariable(org.apache.jena.sparql.expr.Expr)">
 <h3>replaceAggregateByVariable</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></span>&nbsp;<span class="element-name">replaceAggregateByVariable</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</span></div>
 <div class="block">transform an expression that may involve aggregates into one that just uses the variable for the aggregate</div>
 </section>
 </li>
 <li>
 <section class="detail" id="isAssignmentSafeEquality(org.apache.jena.sparql.expr.Expr)">
 <h3>isAssignmentSafeEquality</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isAssignmentSafeEquality</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</span></div>
 <div class="block">Decide whether an expression is safe for using a graph substitution.
  Need to be careful about value-like tests when the graph is not
  matched in a value fashion.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="isAssignmentSafeEquality(org.apache.jena.sparql.expr.Expr,boolean,boolean)">
 <h3>isAssignmentSafeEquality</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isAssignmentSafeEquality</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr,
  boolean&nbsp;graphHasStringEquality,
  boolean&nbsp;graphHasNumercialValueEquality)</span></div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>graphHasStringEquality</code> - True if the graph triple matching equates xsd:string and plain literal</dd>
 <dd><code>graphHasNumercialValueEquality</code> - True if the graph triple matching equates numeric values</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="isStable(org.apache.jena.sparql.expr.Expr)">
 <h3>isStable</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isStable</span><wbr><span class="parameters">(<a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a>&nbsp;expr)</span></div>
 <div class="block">Some "functions" are non-deterministic (unstable) -
  calling them with the same arguments
  does not yields the same answer each time.
  Therefore how and when they are called
  matters.

  Functions: RAND, UUID, StrUUID, BNode

  NOW() is safe.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="nodeToExpr(org.apache.jena.graph.Node)">
 <h3>nodeToExpr</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></span>&nbsp;<span class="element-name">nodeToExpr</span><wbr><span class="parameters">(org.apache.jena.graph.Node&nbsp;n)</span></div>
 <div class="block">Go from a node to an expression.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="rewriteTriple(org.apache.jena.graph.Triple)">
 <h3>rewriteTriple</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="Expr.html" title="interface in org.apache.jena.sparql.expr">Expr</a></span>&nbsp;<span class="element-name">rewriteTriple</span><wbr><span class="parameters">(org.apache.jena.graph.Triple&nbsp;t)</span></div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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