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<div class="subTitle">org.jgrapht.alg</div>
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<h2 title="Class CycleDetector" class="title">Class CycleDetector<V,E></h2>
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<pre>public class <span class="strong">CycleDetector<V,E></span>
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extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
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<div class="block">Performs cycle detection on a graph. The <i>inspected graph</i> is specified
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at construction time and cannot be modified. Currently, the detector supports
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only directed graphs.</div>
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<dl><dt><span class="strong">Since:</span></dt>
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<dd>Sept 16, 2004</dd>
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<dt><span class="strong">Author:</span></dt>
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<dd>John V. Sichi</dd></dl>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../org/jgrapht/alg/CycleDetector.html#CycleDetector(org.jgrapht.DirectedGraph)">CycleDetector</a></strong>(<a href="../../../org/jgrapht/DirectedGraph.html" title="interface in org.jgrapht">DirectedGraph</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>,<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">E</a>> graph)</code>
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<div class="block">Creates a cycle detector for the specified graph.</div>
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</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/alg/CycleDetector.html#detectCycles()">detectCycles</a></strong>()</code>
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<div class="block">Performs yes/no cycle detection on the entire graph.</div>
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</td>
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<tr class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/alg/CycleDetector.html#detectCyclesContainingVertex(V)">detectCyclesContainingVertex</a></strong>(<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a> v)</code>
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<div class="block">Performs yes/no cycle detection on an individual vertex.</div>
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</td>
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<tr class="altColor">
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/alg/CycleDetector.html#findCycles()">findCycles</a></strong>()</code>
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<div class="block">Finds the vertex set for the subgraph of all cycles.</div>
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</td>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/alg/CycleDetector.html#findCyclesContainingVertex(V)">findCyclesContainingVertex</a></strong>(<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a> v)</code>
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<div class="block">Finds the vertex set for the subgraph of all cycles which contain a
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particular vertex.</div>
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<a name="CycleDetector(org.jgrapht.DirectedGraph)">
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<h4>CycleDetector</h4>
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<pre>public CycleDetector(<a href="../../../org/jgrapht/DirectedGraph.html" title="interface in org.jgrapht">DirectedGraph</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>,<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">E</a>> graph)</pre>
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<div class="block">Creates a cycle detector for the specified graph. Currently only directed
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graphs are supported.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>graph</code> - the DirectedGraph in which to detect cycles</dd></dl>
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<h3>Method Detail</h3>
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<a name="detectCycles()">
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<h4>detectCycles</h4>
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<pre>public boolean detectCycles()</pre>
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<div class="block">Performs yes/no cycle detection on the entire graph.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>true iff the graph contains at least one cycle</dd></dl>
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<a name="detectCyclesContainingVertex(java.lang.Object)">
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</a><a name="detectCyclesContainingVertex(V)">
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<h4>detectCyclesContainingVertex</h4>
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<pre>public boolean detectCyclesContainingVertex(<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a> v)</pre>
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<div class="block">Performs yes/no cycle detection on an individual vertex.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - the vertex to test</dd>
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<dt><span class="strong">Returns:</span></dt><dd>true if v is on at least one cycle</dd></dl>
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<a name="findCycles()">
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<h4>findCycles</h4>
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<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>> findCycles()</pre>
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<div class="block">Finds the vertex set for the subgraph of all cycles.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>set of all vertices which participate in at least one cycle in
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this graph</dd></dl>
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<a name="findCyclesContainingVertex(java.lang.Object)">
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<h4>findCyclesContainingVertex</h4>
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<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a>> findCyclesContainingVertex(<a href="../../../org/jgrapht/alg/CycleDetector.html" title="type parameter in CycleDetector">V</a> v)</pre>
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<div class="block">Finds the vertex set for the subgraph of all cycles which contain a
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particular vertex.
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<p>REVIEW jvs 25-Aug-2006: This implementation is not guaranteed to cover
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all cases. If you want to be absolutely certain that you report vertices
|
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from all cycles containing v, it's safer (but less efficient) to use
|
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StrongConnectivityAlgorithm instead and return the strongly connected
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component containing v.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - the vertex to test</dd>
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<dt><span class="strong">Returns:</span></dt><dd>set of all vertices reachable from v via at least one cycle</dd></dl>
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