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<div class="subTitle">org.janusgraph.graphdb.tinkerpop.optimize</div>
<h2 title="Class JanusGraphTraversalUtil" class="title">Class JanusGraphTraversalUtil</h2>
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<pre>public class <span class="typeNameLabel">JanusGraphTraversalUtil</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Matthias Broecheler (me@matthiasb.com)</dd>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#JanusGraphTraversalUtil--">JanusGraphTraversalUtil</a></span>()</code> </td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<td class="colFirst"><code>static org.apache.tinkerpop.gremlin.process.traversal.Step<?,?></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#findMostOuterEligibleStart-org.apache.tinkerpop.gremlin.process.traversal.Step-">findMostOuterEligibleStart</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</code>
<div class="block">In case `step` can be considered as eligible start step then
this method returns the most outer eligible parent step.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/MultiQueryPositions.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize">MultiQueryPositions</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getAllMultiQueryPositionsForMultiQueriable-org.janusgraph.graphdb.tinkerpop.optimize.step.MultiQueriable-boolean-boolean-">getAllMultiQueryPositionsForMultiQueriable</a></span>(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/MultiQueriable.html" title="interface in org.janusgraph.graphdb.tinkerpop.optimize.step">MultiQueriable</a><?,?> multiQueriable,
boolean multiNestedRepeatEligible,
boolean multiNestedRepeatNextIterationEligible)</code>
<div class="block">Backtraces the traversal for the position where a MultiQueriable step would expect its corresponding
JanusGraphMultiQueryStep(s).</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><org.apache.tinkerpop.gremlin.process.traversal.Step></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getEndMultiQueryPosition-org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin-">getEndMultiQueryPosition</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin repeatTraversal)</code>
<div class="block">Returns multi query position for the end of the traversal.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/janusgraph/graphdb/database/StandardJanusGraph.html" title="class in org.janusgraph.graphdb.database">StandardJanusGraph</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getJanusGraph-org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin-">getJanusGraph</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</code> </td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="../../../../../org/janusgraph/graphdb/transaction/StandardJanusGraphTx.html" title="class in org.janusgraph.graphdb.transaction">StandardJanusGraphTx</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getJanusGraphTx-org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin-">getJanusGraphTx</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</code> </td>
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<td class="colFirst"><code>static <a href="../../../../../org/janusgraph/core/JanusGraphVertex.html" title="interface in org.janusgraph.core">JanusGraphVertex</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getJanusGraphVertex-org.apache.tinkerpop.gremlin.structure.Element-">getJanusGraphVertex</a></span>(org.apache.tinkerpop.gremlin.structure.Element v)</code> </td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/janusgraph/core/JanusGraphVertex.html" title="interface in org.janusgraph.core">JanusGraphVertex</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getJanusGraphVertex-org.apache.tinkerpop.gremlin.process.traversal.Traverser-">getJanusGraphVertex</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Traverser<? extends org.apache.tinkerpop.gremlin.structure.Element> traverser)</code> </td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><org.apache.tinkerpop.gremlin.process.traversal.Step></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getLocalMultiQueryPositionForStep-org.apache.tinkerpop.gremlin.process.traversal.Step-">getLocalMultiQueryPositionForStep</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</code>
<div class="block">For a MultiQuery compatible step, this method searches the correct position in the step's traversal at which
a <code>JanusGraphMultiQueryStep</code> should be inserted.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getLocalNonMultiQueryProvidedBatchSize-org.janusgraph.graphdb.tinkerpop.optimize.step.MultiQueriable-">getLocalNonMultiQueryProvidedBatchSize</a></span>(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/MultiQueriable.html" title="interface in org.janusgraph.graphdb.tinkerpop.optimize.step">MultiQueriable</a><?,?> multiQueriable)</code>
<div class="block">Returns local barrier step size if that barrier step is not generated by JanusGraphMultiQueryStep.</div>
</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>static org.apache.tinkerpop.gremlin.process.traversal.Step</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getNextNonIdentityStep-org.apache.tinkerpop.gremlin.process.traversal.Step-">getNextNonIdentityStep</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step start)</code> </td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>static <S> <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><S></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getPreviousStepOfClass-java.lang.Class-org.apache.tinkerpop.gremlin.process.traversal.Step-">getPreviousStepOfClass</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><S> stepClass,
org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> start)</code>
<div class="block">Starting at the given step, this method searches the traversal backwards to find the most recent step which
matches the given class.</div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><org.apache.tinkerpop.gremlin.process.traversal.Step></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getSteps-java.util.function.Predicate-org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin-">getSteps</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a><org.apache.tinkerpop.gremlin.process.traversal.Step> predicate,
org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</code>
<div class="block">Returns a list of steps from the traversal, which match a given predicate.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/janusgraph/core/JanusGraphTransaction.html" title="interface in org.janusgraph.core">JanusGraphTransaction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#getTx-org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin-">getTx</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#isEdgeReturnStep-org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphVertexStep-">isEdgeReturnStep</a></span>(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/JanusGraphVertexStep.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize.step">JanusGraphVertexStep</a> vertexStep)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#isLegalMultiQueryPosition-org.apache.tinkerpop.gremlin.process.traversal.Step-">isLegalMultiQueryPosition</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</code>
<div class="block">This method closely matches the behavior implemented in <code>LazyBarrierStrategy</code> which ensures that
no <code>NoOpBarrierStep</code>s are inserted if path labels are required.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#isMultiQueryCompatibleParent-org.apache.tinkerpop.gremlin.process.traversal.Step-">isMultiQueryCompatibleParent</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#isStartStep-org.apache.tinkerpop.gremlin.process.traversal.Step-">isStartStep</a></span>(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</code>
<div class="block">Checks if the provided step is the start step of its Traversal skipping any `IdentityStep`, `NoOpBarrierStep`,
`SideEffectStep`, `ProfileStep`, and `JanusGraphMultiQueryStep` steps at the beginning.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/JanusGraphTraversalUtil.html#isVertexReturnStep-org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphVertexStep-">isVertexReturnStep</a></span>(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/JanusGraphVertexStep.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize.step">JanusGraphVertexStep</a> vertexStep)</code> </td>
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<h4>JanusGraphTraversalUtil</h4>
<pre>public JanusGraphTraversalUtil()</pre>
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<h4>getJanusGraph</h4>
<pre>public static <a href="../../../../../org/janusgraph/graphdb/database/StandardJanusGraph.html" title="class in org.janusgraph.graphdb.database">StandardJanusGraph</a> getJanusGraph(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</pre>
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<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="../../../../../org/janusgraph/graphdb/transaction/StandardJanusGraphTx.html" title="class in org.janusgraph.graphdb.transaction">StandardJanusGraphTx</a>> getJanusGraphTx(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</pre>
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<pre>public static <a href="../../../../../org/janusgraph/core/JanusGraphVertex.html" title="interface in org.janusgraph.core">JanusGraphVertex</a> getJanusGraphVertex(org.apache.tinkerpop.gremlin.structure.Element v)</pre>
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<pre>public static <a href="../../../../../org/janusgraph/core/JanusGraphVertex.html" title="interface in org.janusgraph.core">JanusGraphVertex</a> getJanusGraphVertex(org.apache.tinkerpop.gremlin.process.traversal.Traverser<? extends org.apache.tinkerpop.gremlin.structure.Element> traverser)</pre>
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<pre>public static boolean isEdgeReturnStep(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/JanusGraphVertexStep.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize.step">JanusGraphVertexStep</a> vertexStep)</pre>
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<pre>public static boolean isVertexReturnStep(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/JanusGraphVertexStep.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize.step">JanusGraphVertexStep</a> vertexStep)</pre>
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<pre>public static org.apache.tinkerpop.gremlin.process.traversal.Step getNextNonIdentityStep(org.apache.tinkerpop.gremlin.process.traversal.Step start)</pre>
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<pre>public static <a href="../../../../../org/janusgraph/core/JanusGraphTransaction.html" title="interface in org.janusgraph.core">JanusGraphTransaction</a> getTx(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</pre>
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<pre>public static org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> findMostOuterEligibleStart(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</pre>
<div class="block">In case `step` can be considered as eligible start step then
this method returns the most outer eligible parent step.
The most outer eligible parent for the provided `step` is
the one which is directly or indirectly includes the provided `step`
and satisfies the following criteria:
<br>
- It includes the maximum number of nested eligible parents for the provided `step`.
- All the nested parents, including the provided `step` must be considered as `start` steps
of their respective traversals.
- Each such nested parent of the provided `step` must be parentToChildProxyStep (determined by
`isParentToChildProxyStep(nextStep)` method).
<br>
In case `step` don't have any eligible parents then the provided `step` will be returned.</div>
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<pre>public static boolean isMultiQueryCompatibleParent(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</pre>
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<pre>public static <a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/MultiQueryPositions.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize">MultiQueryPositions</a> getAllMultiQueryPositionsForMultiQueriable(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/MultiQueriable.html" title="interface in org.janusgraph.graphdb.tinkerpop.optimize.step">MultiQueriable</a><?,?> multiQueriable,
boolean multiNestedRepeatEligible,
boolean multiNestedRepeatNextIterationEligible)</pre>
<div class="block">Backtraces the traversal for the position where a MultiQueriable step would expect its corresponding
JanusGraphMultiQueryStep(s). In case of MultiQueriables nested in RepeatSteps, multiple destinations
are returned.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>multiQueriable</code> - The MultiQuery compatible step whose MultiQueryStep positions shall be searched.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The step before which the MultiQueryStep is located or expected.</dd>
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<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><org.apache.tinkerpop.gremlin.process.traversal.Step> getEndMultiQueryPosition(org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin repeatTraversal)</pre>
<div class="block">Returns multi query position for the end of the traversal.
This can be useful in case by the end of the traversal, vertices should be registered for prefetching
in some other places.</div>
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<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><org.apache.tinkerpop.gremlin.process.traversal.Step> getLocalMultiQueryPositionForStep(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</pre>
<div class="block">For a MultiQuery compatible step, this method searches the correct position in the step's traversal at which
a <code>JanusGraphMultiQueryStep</code> should be inserted. Only the traversal of the given step is considered,
parent and child traversals are not taken into account.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>step</code> - The MultiQuery compatible step.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The step before which a <code>JanusGraphMultiQueryStep</code> should be inserted.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/JanusGraphMultiQueryStep.html" title="class in org.janusgraph.graphdb.tinkerpop.optimize.step"><code>JanusGraphMultiQueryStep</code></a></dd>
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<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> getLocalNonMultiQueryProvidedBatchSize(<a href="../../../../../org/janusgraph/graphdb/tinkerpop/optimize/step/MultiQueriable.html" title="interface in org.janusgraph.graphdb.tinkerpop.optimize.step">MultiQueriable</a><?,?> multiQueriable)</pre>
<div class="block">Returns local barrier step size if that barrier step is not generated by JanusGraphMultiQueryStep.</div>
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<pre>public static boolean isStartStep(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</pre>
<div class="block">Checks if the provided step is the start step of its Traversal skipping any `IdentityStep`, `NoOpBarrierStep`,
`SideEffectStep`, `ProfileStep`, and `JanusGraphMultiQueryStep` steps at the beginning.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>step</code> - Step to check.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>`true` if the step can be considered as the start of its traversal. `false` otherwise.</dd>
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<pre>public static boolean isLegalMultiQueryPosition(org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> step)</pre>
<div class="block">This method closely matches the behavior implemented in <code>LazyBarrierStrategy</code> which ensures that
no <code>NoOpBarrierStep</code>s are inserted if path labels are required. Since the same limitation applies
to <code>JanusGraphMultiQueryStep</code>s, the definition of legal positions for this step is the same.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>step</code> - The step which follows the JanusGraphMultiQueryStep to be inserted.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if no path labels are required for this position, otherwise <code>false</code>.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>LazyBarrierStrategy</code></dd>
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<pre>public static <S> <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><S> getPreviousStepOfClass(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><S> stepClass,
org.apache.tinkerpop.gremlin.process.traversal.Step<?,?> start)</pre>
<div class="block">Starting at the given step, this method searches the traversal backwards to find the most recent step which
matches the given class. Only the traversal of the given step is scanned and parent or child traversals are
not taken into account.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>S</code> - The class of the requested step.</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stepClass</code> - The class of the requested step.</dd>
<dd><code>start</code> - The step from which the search is started.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An Optional which contains the requested step if it was found.</dd>
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<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><org.apache.tinkerpop.gremlin.process.traversal.Step> getSteps(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a><org.apache.tinkerpop.gremlin.process.traversal.Step> predicate,
org.apache.tinkerpop.gremlin.process.traversal.Traversal.Admin<?,?> traversal)</pre>
<div class="block">Returns a list of steps from the traversal, which match a given predicate.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>predicate</code> - Whether or not a step should be in the returned list.</dd>
<dd><code>traversal</code> - The traversal whose steps should be used.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The list of matching steps.</dd>
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