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<h2 title="Interface UnionFind" class="title">Interface UnionFind<E></h2>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>E</code> - element type</dd></dl>
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<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../com/google/javascript/jscomp/graph/StandardUnionFind.html" title="class in com.google.javascript.jscomp.graph">StandardUnionFind</a></dd>
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<pre>public interface <span class="strong">UnionFind<E></span></pre>
<div class="block">Union-Find is a classical algorithm used to find connected components in
graph theory.
<p>Each equivalence class has a representative element that is chosen
arbitrarily and is used to determine if two elements are members of the same
class.
<p>See <a
href="http://www.algorithmist.com/index.php?title=Union_Find&oldid=7575">
algorithmist</a> for more detail.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#add(E)">add</a></strong>(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> e)</code>
<div class="block">Adds the given element to a new set if it is not already in a set.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Collection<java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>>></code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#allEquivalenceClasses()">allEquivalenceClasses</a></strong>()</code>
<div class="block">Returns an immutable collection containing all equivalence classes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#areEquivalent(E, E)">areEquivalent</a></strong>(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> a,
<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> b)</code>
<div class="block">Returns true if <code>a</code> and <code>b</code> belong to the same equivalence
class.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#elements()">elements</a></strong>()</code>
<div class="block">Returns an unmodifiable set of all elements added to the UnionFind.</div>
</td>
</tr>
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<td class="colFirst"><code><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#find(E)">find</a></strong>(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> e)</code>
<div class="block">Returns the representative of the equivalence class of <code>e</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#findAll(E)">findAll</a></strong>(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> value)</code>
<div class="block">Returns the elements in the same equivalence class as <code>value</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#union(E, E)">union</a></strong>(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> a,
<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> b)</code>
<div class="block">Unions the equivalence classes of <code>a</code> and <code>b</code> and returns the
representative of the resulting equivalence class.</div>
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<h4>add</h4>
<pre>void add(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> e)</pre>
<div class="block">Adds the given element to a new set if it is not already in a set.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the add operation is not
supported by this union-find.</dd></dl>
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<a name="union(java.lang.Object,java.lang.Object)">
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<h4>union</h4>
<pre><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> union(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> a,
<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> b)</pre>
<div class="block">Unions the equivalence classes of <code>a</code> and <code>b</code> and returns the
representative of the resulting equivalence class. The elements will be
added if they are not already present.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the add operation is not
supported by this union-find.</dd></dl>
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<a name="find(java.lang.Object)">
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<h4>find</h4>
<pre><a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> find(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> e)</pre>
<div class="block">Returns the representative of the equivalence class of <code>e</code>.</div>
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<h4>areEquivalent</h4>
<pre>boolean areEquivalent(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> a,
<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> b)</pre>
<div class="block">Returns true if <code>a</code> and <code>b</code> belong to the same equivalence
class.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if any argument is not an element of this
structure.</dd></dl>
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<h4>elements</h4>
<pre>java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>> elements()</pre>
<div class="block">Returns an unmodifiable set of all elements added to the UnionFind.</div>
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<h4>allEquivalenceClasses</h4>
<pre>java.util.Collection<java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>>> allEquivalenceClasses()</pre>
<div class="block">Returns an immutable collection containing all equivalence classes. The
returned collection represents a snapshot of the current state and will not
reflect changes made to the data structure.</div>
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<h4>findAll</h4>
<pre>java.util.Set<<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a>> findAll(<a href="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</a> value)</pre>
<div class="block">Returns the elements in the same equivalence class as <code>value</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an unmodifiable view. As equivalence classes are merged, this set
will reflect those changes.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if a requested element does not belong
to the structure.</dd></dl>
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