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<title>FibonacciHeap (JGraphT : a free Java graph library)</title>
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<div class="subTitle">org.jgrapht.util</div>
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<h2 title="Class FibonacciHeap" class="title">Class FibonacciHeap<T></h2>
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</div>
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<div class="contentContainer">
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<ul class="inheritance">
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<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>
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<li>
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<ul class="inheritance">
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<li>org.jgrapht.util.FibonacciHeap<T></li>
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</ul>
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</ul>
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<br>
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<pre>public class <span class="strong">FibonacciHeap<T></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">This class implements a Fibonacci heap data structure. Much of the code in
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this class is based on the algorithms in the "Introduction to Algorithms"by
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Cormen, Leiserson, and Rivest in Chapter 21. The amortized running time of
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most of these methods is O(1), making it a very fast data structure. Several
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have an actual running time of O(1). removeMin() and delete() have O(log n)
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amortized running times because they do the heap consolidation. If you
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attempt to store nodes in this heap with key values of -Infinity
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(Double.NEGATIVE_INFINITY) the <code>delete()</code> operation may fail to
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remove the correct element.
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<p><b>Note that this implementation is not synchronized.</b> If multiple
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threads access a set concurrently, and at least one of the threads modifies
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the set, it <i>must</i> be synchronized externally. This is typically
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accomplished by synchronizing on some object that naturally encapsulates the
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set.</p>
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<p>This class was originally developed by Nathan Fiedler for the GraphMaker
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project. It was imported to JGraphT with permission, courtesy of Nathan
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Fiedler.</p></div>
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<dl><dt><span class="strong">Author:</span></dt>
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<dd>Nathan Fiedler</dd></dl>
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</li>
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</ul>
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<h3>Constructor Summary</h3>
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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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<tr>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
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<td class="colOne"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#FibonacciHeap()">FibonacciHeap</a></strong>()</code>
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<div class="block">Constructs a FibonacciHeap object that contains no elements.</div>
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</td>
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</tr>
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</table>
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</li>
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<h3>Method Summary</h3>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
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<td class="colFirst"><code>protected void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#cascadingCut(org.jgrapht.util.FibonacciHeapNode)">cascadingCut</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y)</code>
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<div class="block">Performs a cascading cut operation.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#clear()">clear</a></strong>()</code>
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<div class="block">Removes all elements from this heap.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>protected void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#consolidate()">consolidate</a></strong>()</code> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#cut(org.jgrapht.util.FibonacciHeapNode,%20org.jgrapht.util.FibonacciHeapNode)">cut</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x,
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<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y)</code>
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<div class="block">The reverse of the link operation: removes x from the child list of y.</div>
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</td>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#decreaseKey(org.jgrapht.util.FibonacciHeapNode,%20double)">decreaseKey</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x,
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double k)</code>
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<div class="block">Decreases the key value for a heap node, given the new value to take on.</div>
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</td>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#delete(org.jgrapht.util.FibonacciHeapNode)">delete</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x)</code>
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<div class="block">Deletes a node from the heap given the reference to the node.</div>
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</td>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#insert(org.jgrapht.util.FibonacciHeapNode,%20double)">insert</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> node,
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double key)</code>
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<div class="block">Inserts a new data element into the heap.</div>
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</td>
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#isEmpty()">isEmpty</a></strong>()</code>
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<div class="block">Tests if the Fibonacci heap is empty or not.</div>
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</td>
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<td class="colFirst"><code>protected void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#link(org.jgrapht.util.FibonacciHeapNode,%20org.jgrapht.util.FibonacciHeapNode)">link</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y,
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<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x)</code>
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<div class="block">Make node y a child of node x.</div>
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</td>
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<tr class="rowColor">
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<td class="colFirst"><code><a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#min()">min</a></strong>()</code>
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<div class="block">Returns the smallest element in the heap.</div>
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</td>
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<tr class="altColor">
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<td class="colFirst"><code><a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#removeMin()">removeMin</a></strong>()</code>
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<div class="block">Removes the smallest element from the heap.</div>
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</td>
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<tr class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#size()">size</a></strong>()</code>
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<div class="block">Returns the size of the heap which is measured in the number of elements
|
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contained in the heap.</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/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#toString()">toString</a></strong>()</code>
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<div class="block">Creates a String representation of this Fibonacci heap.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <T> <a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T></code></td>
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<td class="colLast"><code><strong><a href="../../../org/jgrapht/util/FibonacciHeap.html#union(org.jgrapht.util.FibonacciHeap,%20org.jgrapht.util.FibonacciHeap)">union</a></strong>(<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T> h1,
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<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T> h2)</code>
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<div class="block">Joins two Fibonacci heaps into a new one.</div>
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</td>
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<h3>Methods inherited from class 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>
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<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#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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<h3>Constructor Detail</h3>
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<a name="FibonacciHeap()">
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</a>
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<pre>public FibonacciHeap()</pre>
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<div class="block">Constructs a FibonacciHeap object that contains no elements.</div>
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<pre>public boolean isEmpty()</pre>
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<div class="block">Tests if the Fibonacci heap is empty or not. Returns true if the heap is
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empty, false otherwise.
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<p>Running time: O(1) actual</p></div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>true if the heap is empty, false otherwise</dd></dl>
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<pre>public void clear()</pre>
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<div class="block">Removes all elements from this heap.</div>
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<a name="decreaseKey(org.jgrapht.util.FibonacciHeapNode, double)">
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<pre>public void decreaseKey(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x,
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double k)</pre>
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<div class="block">Decreases the key value for a heap node, given the new value to take on.
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The structure of the heap may be changed and will not be consolidated.
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<p>Running time: O(1) amortized</p></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - node to decrease the key of</dd><dd><code>k</code> - new key value for node x</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - Thrown if k is larger than x.key
|
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value.</dd></dl>
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<a name="delete(org.jgrapht.util.FibonacciHeapNode)">
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<h4>delete</h4>
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<pre>public void delete(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x)</pre>
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<div class="block">Deletes a node from the heap given the reference to the node. The trees
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in the heap will be consolidated, if necessary. This operation may fail
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to remove the correct element if there are nodes with key value
|
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-Infinity.
|
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<p>Running time: O(log n) amortized</p></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - node to remove from heap</dd></dl>
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</li>
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<a name="insert(org.jgrapht.util.FibonacciHeapNode, double)">
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<h4>insert</h4>
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<pre>public void insert(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> node,
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double key)</pre>
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<div class="block">Inserts a new data element into the heap. No heap consolidation is
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performed at this time, the new node is simply inserted into the root
|
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list of this heap.
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<p>Running time: O(1) actual</p></div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>node</code> - new node to insert into heap</dd><dd><code>key</code> - key value associated with data object</dd></dl>
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</li>
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<a name="min()">
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<h4>min</h4>
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<pre>public <a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> min()</pre>
|
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<div class="block">Returns the smallest element in the heap. This smallest element is the
|
||
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one with the minimum key value.
|
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<p>Running time: O(1) actual</p></div>
|
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<dl><dt><span class="strong">Returns:</span></dt><dd>heap node with the smallest key</dd></dl>
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</li>
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<a name="removeMin()">
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<h4>removeMin</h4>
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<pre>public <a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> removeMin()</pre>
|
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<div class="block">Removes the smallest element from the heap. This will cause the trees in
|
||
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the heap to be consolidated, if necessary.
|
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<p>Running time: O(log n) amortized</p></div>
|
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<dl><dt><span class="strong">Returns:</span></dt><dd>node with the smallest key</dd></dl>
|
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</li>
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<a name="size()">
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<h4>size</h4>
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<pre>public int size()</pre>
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<div class="block">Returns the size of the heap which is measured in the number of elements
|
||
|
contained in the heap.
|
||
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|
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<p>Running time: O(1) actual</p></div>
|
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<dl><dt><span class="strong">Returns:</span></dt><dd>number of elements in the heap</dd></dl>
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<a name="union(org.jgrapht.util.FibonacciHeap, org.jgrapht.util.FibonacciHeap)">
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<h4>union</h4>
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<pre>public static <T> <a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T> union(<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T> h1,
|
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<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="class in org.jgrapht.util">FibonacciHeap</a><T> h2)</pre>
|
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<div class="block">Joins two Fibonacci heaps into a new one. No heap consolidation is
|
||
|
performed at this time. The two root lists are simply joined together.
|
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|
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<p>Running time: O(1) actual</p></div>
|
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>h1</code> - first heap</dd><dd><code>h2</code> - second heap</dd>
|
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<dt><span class="strong">Returns:</span></dt><dd>new heap containing h1 and h2</dd></dl>
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<h4>toString</h4>
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<pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre>
|
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<div class="block">Creates a String representation of this Fibonacci heap.</div>
|
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<dl>
|
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<dt><strong>Overrides:</strong></dt>
|
||
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<dd><code><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></code> in class <code><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></dd>
|
||
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<dt><span class="strong">Returns:</span></dt><dd>String of this.</dd></dl>
|
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</li>
|
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</ul>
|
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<a name="cascadingCut(org.jgrapht.util.FibonacciHeapNode)">
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<h4>cascadingCut</h4>
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<pre>protected void cascadingCut(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y)</pre>
|
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<div class="block">Performs a cascading cut operation. This cuts y from its parent and then
|
||
|
does the same for its parent, and so on up the tree.
|
||
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|
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<p>Running time: O(log n); O(1) excluding the recursion</p></div>
|
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>y</code> - node to perform cascading cut on</dd></dl>
|
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<a name="consolidate()">
|
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<h4>consolidate</h4>
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<pre>protected void consolidate()</pre>
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|
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<a name="cut(org.jgrapht.util.FibonacciHeapNode, org.jgrapht.util.FibonacciHeapNode)">
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<h4>cut</h4>
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<pre>protected void cut(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x,
|
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<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y)</pre>
|
||
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<div class="block">The reverse of the link operation: removes x from the child list of y.
|
||
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This method assumes that min is non-null.
|
||
|
|
||
|
<p>Running time: O(1)</p></div>
|
||
|
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>x</code> - child of y to be removed from y's child list</dd><dd><code>y</code> - parent of x about to lose a child</dd></dl>
|
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</li>
|
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</ul>
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<a name="link(org.jgrapht.util.FibonacciHeapNode, org.jgrapht.util.FibonacciHeapNode)">
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<h4>link</h4>
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<pre>protected void link(<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> y,
|
||
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<a href="../../../org/jgrapht/util/FibonacciHeapNode.html" title="class in org.jgrapht.util">FibonacciHeapNode</a><<a href="../../../org/jgrapht/util/FibonacciHeap.html" title="type parameter in FibonacciHeap">T</a>> x)</pre>
|
||
|
<div class="block">Make node y a child of node x.
|
||
|
|
||
|
<p>Running time: O(1) actual</p></div>
|
||
|
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>y</code> - node to become child</dd><dd><code>x</code> - node to become parent</dd></dl>
|
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</li>
|
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|
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