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DungeonGenerator/javadoc/org/jgrapht/traverse/DepthFirstIterator.html

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<div class="subTitle">org.jgrapht.traverse</div>
<h2 title="Class DepthFirstIterator" class="title">Class DepthFirstIterator&lt;V,E&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html" title="class in org.jgrapht.traverse">org.jgrapht.traverse.AbstractGraphIterator</a>&lt;V,E&gt;</li>
<li>
<ul class="inheritance">
<li><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">org.jgrapht.traverse.CrossComponentIterator</a>&lt;V,E,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</li>
<li>
<ul class="inheritance">
<li>org.jgrapht.traverse.DepthFirstIterator&lt;V,E&gt;</li>
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<div class="description">
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;V&gt;, <a href="../../../org/jgrapht/traverse/GraphIterator.html" title="interface in org.jgrapht.traverse">GraphIterator</a>&lt;V,E&gt;</dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">DepthFirstIterator&lt;V,E&gt;</span>
extends <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a>&lt;V,E,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</pre>
<div class="block">A depth-first iterator for a directed and an undirected graph. For this
iterator to work correctly the graph must not be modified during iteration.
Currently there are no means to ensure that, nor to fail-fast. The results of
such modifications are undefined.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>Jul 29, 2003</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Liviu Rau, Barak Naveh</dd></dl>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.jgrapht.traverse.<a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a></h3>
<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a></code></li>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static <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></code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#SENTINEL">SENTINEL</a></strong></code>
<div class="block">Sentinel object.</div>
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<h3>Fields inherited from class&nbsp;org.jgrapht.traverse.<a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html" title="class in org.jgrapht.traverse">AbstractGraphIterator</a></h3>
<code><a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#nListeners">nListeners</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#DepthFirstIterator(org.jgrapht.Graph)">DepthFirstIterator</a></strong>(<a href="../../../org/jgrapht/Graph.html" title="interface in org.jgrapht">Graph</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&gt;&nbsp;g)</code>
<div class="block">Creates a new depth-first iterator for the specified graph.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#DepthFirstIterator(org.jgrapht.Graph,%20V)">DepthFirstIterator</a></strong>(<a href="../../../org/jgrapht/Graph.html" title="interface in org.jgrapht">Graph</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&gt;&nbsp;g,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;startVertex)</code>
<div class="block">Creates a new depth-first iterator for the specified graph.</div>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#encounterVertex(V,%20E)">encounterVertex</a></strong>(<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;vertex,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&nbsp;edge)</code>
<div class="block">Update data structures the first time we see a vertex.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#encounterVertexAgain(V,%20E)">encounterVertexAgain</a></strong>(<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;vertex,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&nbsp;edge)</code>
<div class="block">Called whenever we re-encounter a vertex.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Deque.html?is-external=true" title="class or interface in java.util">Deque</a>&lt;<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>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#getStack()">getStack</a></strong>()</code>
<div class="block">Retrieves the LIFO stack of vertices which have been encountered but not
yet visited (WHITE).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#isConnectedComponentExhausted()">isConnectedComponentExhausted</a></strong>()</code>
<div class="block">Returns <tt>true</tt> if there are no more uniterated vertices in the
currently iterated connected component; <tt>false</tt> otherwise.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/jgrapht/traverse/DepthFirstIterator.html#provideNextVertex()">provideNextVertex</a></strong>()</code>
<div class="block">Returns the vertex to be returned in the following call to the iterator
<code>next</code> method.</div>
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<h3>Methods inherited from class&nbsp;org.jgrapht.traverse.<a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a></h3>
<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#finishVertex(V)">finishVertex</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#getGraph()">getGraph</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#getSeenData(V)">getSeenData</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#hasNext()">hasNext</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#isSeenVertex(java.lang.Object)">isSeenVertex</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#next()">next</a>, <a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#putSeenData(V,%20D)">putSeenData</a></code></li>
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<h3>Methods inherited from class&nbsp;org.jgrapht.traverse.<a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html" title="class in org.jgrapht.traverse">AbstractGraphIterator</a></h3>
<code><a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#addTraversalListener(org.jgrapht.event.TraversalListener)">addTraversalListener</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#fireConnectedComponentFinished(org.jgrapht.event.ConnectedComponentTraversalEvent)">fireConnectedComponentFinished</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#fireConnectedComponentStarted(org.jgrapht.event.ConnectedComponentTraversalEvent)">fireConnectedComponentStarted</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#fireEdgeTraversed(org.jgrapht.event.EdgeTraversalEvent)">fireEdgeTraversed</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#fireVertexFinished(org.jgrapht.event.VertexTraversalEvent)">fireVertexFinished</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#fireVertexTraversed(org.jgrapht.event.VertexTraversalEvent)">fireVertexTraversed</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#isCrossComponentTraversal()">isCrossComponentTraversal</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#isReuseEvents()">isReuseEvents</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#remove()">remove</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#removeTraversalListener(org.jgrapht.event.TraversalListener)">removeTraversalListener</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#setCrossComponentTraversal(boolean)">setCrossComponentTraversal</a>, <a href="../../../org/jgrapht/traverse/AbstractGraphIterator.html#setReuseEvents(boolean)">setReuseEvents</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<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></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final&nbsp;<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> SENTINEL</pre>
<div class="block">Sentinel object. Unfortunately, we can't use null, because ArrayDeque
won't accept those. And we don't want to rely on the caller to provide a
sentinel object for us. So we have to play typecasting games.</div>
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<a name="DepthFirstIterator(org.jgrapht.Graph)">
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<h4>DepthFirstIterator</h4>
<pre>public&nbsp;DepthFirstIterator(<a href="../../../org/jgrapht/Graph.html" title="interface in org.jgrapht">Graph</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&gt;&nbsp;g)</pre>
<div class="block">Creates a new depth-first iterator for the specified graph.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>g</code> - the graph to be iterated.</dd></dl>
</li>
</ul>
<a name="DepthFirstIterator(org.jgrapht.Graph,java.lang.Object)">
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<h4>DepthFirstIterator</h4>
<pre>public&nbsp;DepthFirstIterator(<a href="../../../org/jgrapht/Graph.html" title="interface in org.jgrapht">Graph</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&gt;&nbsp;g,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;startVertex)</pre>
<div class="block">Creates a new depth-first iterator for the specified graph. Iteration
will start at the specified start vertex and will be limited to the
connected component that includes that vertex. If the specified start
vertex is <code>null</code>, iteration will start at an arbitrary vertex
and will not be limited, that is, will be able to traverse all the graph.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>g</code> - the graph to be iterated.</dd><dd><code>startVertex</code> - the vertex iteration to be started.</dd></dl>
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<a name="isConnectedComponentExhausted()">
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<h4>isConnectedComponentExhausted</h4>
<pre>protected&nbsp;boolean&nbsp;isConnectedComponentExhausted()</pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#isConnectedComponentExhausted()">CrossComponentIterator</a></code></strong></div>
<div class="block">Returns <tt>true</tt> if there are no more uniterated vertices in the
currently iterated connected component; <tt>false</tt> otherwise.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#isConnectedComponentExhausted()">isConnectedComponentExhausted</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</code></dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if there are no more uniterated vertices in the
currently iterated connected component; <tt>false</tt> otherwise.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#isConnectedComponentExhausted()"><code>CrossComponentIterator.isConnectedComponentExhausted()</code></a></dd></dl>
</li>
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<h4>encounterVertex</h4>
<pre>protected&nbsp;void&nbsp;encounterVertex(<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;vertex,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&nbsp;edge)</pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertex(V,%20E)">CrossComponentIterator</a></code></strong></div>
<div class="block">Update data structures the first time we see a vertex.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertex(V,%20E)">encounterVertex</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>vertex</code> - the vertex encountered</dd><dd><code>edge</code> - the edge via which the vertex was encountered, or null if the
vertex is a starting point</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertex(V,%20E)"><code>CrossComponentIterator.encounterVertex(Object, Object)</code></a></dd></dl>
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<a name="encounterVertexAgain(java.lang.Object,java.lang.Object)">
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<h4>encounterVertexAgain</h4>
<pre>protected&nbsp;void&nbsp;encounterVertexAgain(<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;vertex,
<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>&nbsp;edge)</pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertexAgain(V,%20E)">CrossComponentIterator</a></code></strong></div>
<div class="block">Called whenever we re-encounter a vertex. The default implementation does
nothing.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertexAgain(V,%20E)">encounterVertexAgain</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>vertex</code> - the vertex re-encountered</dd><dd><code>edge</code> - the edge via which the vertex was re-encountered</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#encounterVertexAgain(V,%20E)"><code>CrossComponentIterator.encounterVertexAgain(Object, Object)</code></a></dd></dl>
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<h4>provideNextVertex</h4>
<pre>protected&nbsp;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>&nbsp;provideNextVertex()</pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#provideNextVertex()">CrossComponentIterator</a></code></strong></div>
<div class="block">Returns the vertex to be returned in the following call to the iterator
<code>next</code> method.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#provideNextVertex()">provideNextVertex</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html" title="class in org.jgrapht.traverse">CrossComponentIterator</a>&lt;<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">V</a>,<a href="../../../org/jgrapht/traverse/DepthFirstIterator.html" title="type parameter in DepthFirstIterator">E</a>,<a href="../../../org/jgrapht/traverse/CrossComponentIterator.VisitColor.html" title="enum in org.jgrapht.traverse">CrossComponentIterator.VisitColor</a>&gt;</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the next vertex to be returned by this iterator.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/jgrapht/traverse/CrossComponentIterator.html#provideNextVertex()"><code>CrossComponentIterator.provideNextVertex()</code></a></dd></dl>
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<h4>getStack</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Deque.html?is-external=true" title="class or interface in java.util">Deque</a>&lt;<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>&gt;&nbsp;getStack()</pre>
<div class="block">Retrieves the LIFO stack of vertices which have been encountered but not
yet visited (WHITE). This stack also contains <em>sentinel</em> entries
representing vertices which have been visited but are still GRAY. A
sentinel entry is a sequence (v, SENTINEL), whereas a non-sentinel entry
is just (v).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>stack</dd></dl>
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