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UnionFind (Compiler)
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com.google.javascript.jscomp.graph</FONT>
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Interface UnionFind&lt;E&gt;</H2>
<DL>
<DT><DT><B>Type Parameters:</B><DD><CODE>E</CODE> - element type</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../com/google/javascript/jscomp/graph/StandardUnionFind.html" title="class in com.google.javascript.jscomp.graph">StandardUnionFind</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>UnionFind&lt;E&gt;</B></DL>
</PRE>
<P>
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.
<P>
<P>
<HR>
<P>
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#add(E)">add</A></B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;e)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adds the given element to a new set if it is not already in a set.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt;&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#allEquivalenceClasses()">allEquivalenceClasses</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an immutable collection containing all equivalence classes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#areEquivalent(E, E)">areEquivalent</A></B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;a,
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;b)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns true if <code>a</code> and <code>b</code> belong to the same equivalence
class.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#elements()">elements</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an unmodifiable set of all elements added to the UnionFind.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#find(E)">find</A></B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;e)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the representative of the equivalence class of <code>e</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#findAll(E)">findAll</A></B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;value)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the elements in the same equivalence class as <code>value</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html#union(E, E)">union</A></B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;a,
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;b)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unions the equivalence classes of <code>a</code> and <code>b</code> and returns the
representative of the resulting equivalence class.</TD>
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<A NAME="add(java.lang.Object)"><!-- --></A><A NAME="add(E)"><!-- --></A><H3>
add</H3>
<PRE>
void <B>add</B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;e)</PRE>
<DL>
<DD>Adds the given element to a new set if it is not already in a set.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if the add operation is not
supported by this union-find.</DL>
</DD>
</DL>
<HR>
<A NAME="union(java.lang.Object,java.lang.Object)"><!-- --></A><A NAME="union(E, E)"><!-- --></A><H3>
union</H3>
<PRE>
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A> <B>union</B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;a,
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;b)</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if the add operation is not
supported by this union-find.</DL>
</DD>
</DL>
<HR>
<A NAME="find(java.lang.Object)"><!-- --></A><A NAME="find(E)"><!-- --></A><H3>
find</H3>
<PRE>
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A> <B>find</B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;e)</PRE>
<DL>
<DD>Returns the representative of the equivalence class of <code>e</code>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="areEquivalent(java.lang.Object,java.lang.Object)"><!-- --></A><A NAME="areEquivalent(E, E)"><!-- --></A><H3>
areEquivalent</H3>
<PRE>
boolean <B>areEquivalent</B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;a,
<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;b)</PRE>
<DL>
<DD>Returns true if <code>a</code> and <code>b</code> belong to the same equivalence
class.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if any argument is not an element of this
structure.</DL>
</DD>
</DL>
<HR>
<A NAME="elements()"><!-- --></A><H3>
elements</H3>
<PRE>
<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt; <B>elements</B>()</PRE>
<DL>
<DD>Returns an unmodifiable set of all elements added to the UnionFind.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="allEquivalenceClasses()"><!-- --></A><H3>
allEquivalenceClasses</H3>
<PRE>
<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt;&gt; <B>allEquivalenceClasses</B>()</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="findAll(java.lang.Object)"><!-- --></A><A NAME="findAll(E)"><!-- --></A><H3>
findAll</H3>
<PRE>
<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&gt; <B>findAll</B>(<A HREF="../../../../../com/google/javascript/jscomp/graph/UnionFind.html" title="type parameter in UnionFind">E</A>&nbsp;value)</PRE>
<DL>
<DD>Returns the elements in the same equivalence class as <code>value</code>.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an unmodifiable view. As equivalence classes are merged, this set
will reflect those changes.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if a requested element does not belong
to the structure.</DL>
</DD>
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