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CollectionUtils (plexus-utils API)
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org.codehaus.plexus.util</FONT>
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Class CollectionUtils</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.codehaus.plexus.util.CollectionUtils</B>
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<DL>
<DT><PRE>public class <B>CollectionUtils</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Id: CollectionUtils.java 8055 2009-01-16 12:45:08Z vsiveton $</DD>
<DT><B>Author:</B></DT>
<DD><a href="mailto:olamy@codehaus.org">olamy</a></DD>
</DL>
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<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#CollectionUtils()">CollectionUtils</A></B>()</CODE>
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<CODE>static java.util.Map</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#getCardinalityMap(java.util.Collection)">getCardinalityMap</A></B>(java.util.Collection col)</CODE>
<BR>
Returns a <CODE>Map</CODE> mapping each unique element in
the given <CODE>Collection</CODE> to an <CODE>Integer</CODE>
representing the number of occurances of that element
in the <CODE>Collection</CODE>.</TD>
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<CODE>static java.util.Collection</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#intersection(java.util.Collection, java.util.Collection)">intersection</A></B>(java.util.Collection a,
java.util.Collection b)</CODE>
<BR>
Returns a <CODE>Collection</CODE> containing the intersection
of the given <CODE>Collection</CODE>s.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.util.List</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#iteratorToList(java.util.Iterator)">iteratorToList</A></B>(java.util.Iterator it)</CODE>
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<CODE>static java.util.Map</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#mergeMaps(java.util.Map[])">mergeMaps</A></B>(java.util.Map[] maps)</CODE>
<BR>
Take a series of <code>Map</code>s and merge
them where the ordering of the array from 0..n
is the dominant order.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.util.Map</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#mergeMaps(java.util.Map, java.util.Map)">mergeMaps</A></B>(java.util.Map dominantMap,
java.util.Map recessiveMap)</CODE>
<BR>
Take a dominant and recessive Map and merge the key:value
pairs where the recessive Map may add key:value pairs to the dominant
Map but may not override any existing key:value pairs.</TD>
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<CODE>static java.util.Collection</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/codehaus/plexus/util/CollectionUtils.html#subtract(java.util.Collection, java.util.Collection)">subtract</A></B>(java.util.Collection a,
java.util.Collection b)</CODE>
<BR>
Returns a <CODE>Collection</CODE> containing <tt><i>a</i> - <i>b</i></tt>.</TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="CollectionUtils()"><!-- --></A><H3>
CollectionUtils</H3>
<PRE>
public <B>CollectionUtils</B>()</PRE>
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<A NAME="mergeMaps(java.util.Map, java.util.Map)"><!-- --></A><H3>
mergeMaps</H3>
<PRE>
public static java.util.Map <B>mergeMaps</B>(java.util.Map dominantMap,
java.util.Map recessiveMap)</PRE>
<DL>
<DD>Take a dominant and recessive Map and merge the key:value
pairs where the recessive Map may add key:value pairs to the dominant
Map but may not override any existing key:value pairs.
If we have two Maps, a dominant and recessive, and
their respective keys are as follows:
dominantMapKeys = { a, b, c, d, e, f }
recessiveMapKeys = { a, b, c, x, y, z }
Then the result should be the following:
resultantKeys = { a, b, c, d, e, f, x, y, z }
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dominantMap</CODE> - Dominant Map.<DD><CODE>recessiveMap</CODE> - Recessive Map.
<DT><B>Returns:</B><DD>The result map with combined dominant and recessive values.</DL>
</DD>
</DL>
<HR>
<A NAME="mergeMaps(java.util.Map[])"><!-- --></A><H3>
mergeMaps</H3>
<PRE>
public static java.util.Map <B>mergeMaps</B>(java.util.Map[] maps)</PRE>
<DL>
<DD>Take a series of <code>Map</code>s and merge
them where the ordering of the array from 0..n
is the dominant order.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maps</CODE> - An array of Maps to merge.
<DT><B>Returns:</B><DD>Map The result Map produced after the merging process.</DL>
</DD>
</DL>
<HR>
<A NAME="intersection(java.util.Collection, java.util.Collection)"><!-- --></A><H3>
intersection</H3>
<PRE>
public static java.util.Collection <B>intersection</B>(java.util.Collection a,
java.util.Collection b)</PRE>
<DL>
<DD>Returns a <CODE>Collection</CODE> containing the intersection
of the given <CODE>Collection</CODE>s.
<p>
The cardinality of each element in the returned <CODE>Collection</CODE>
will be equal to the minimum of the cardinality of that element
in the two given <CODE>Collection</CODE>s.
<P>
<DD><DL>
<DT><B>See Also:</B><DD><CODE>Collection.retainAll(java.util.Collection<?>)</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="subtract(java.util.Collection, java.util.Collection)"><!-- --></A><H3>
subtract</H3>
<PRE>
public static java.util.Collection <B>subtract</B>(java.util.Collection a,
java.util.Collection b)</PRE>
<DL>
<DD>Returns a <CODE>Collection</CODE> containing <tt><i>a</i> - <i>b</i></tt>.
The cardinality of each element <i>e</i> in the returned <CODE>Collection</CODE>
will be the cardinality of <i>e</i> in <i>a</i> minus the cardinality
of <i>e</i> in <i>b</i>, or zero, whichever is greater.
<P>
<DD><DL>
<DT><B>See Also:</B><DD><CODE>Collection.removeAll(java.util.Collection<?>)</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getCardinalityMap(java.util.Collection)"><!-- --></A><H3>
getCardinalityMap</H3>
<PRE>
public static java.util.Map <B>getCardinalityMap</B>(java.util.Collection col)</PRE>
<DL>
<DD>Returns a <CODE>Map</CODE> mapping each unique element in
the given <CODE>Collection</CODE> to an <CODE>Integer</CODE>
representing the number of occurances of that element
in the <CODE>Collection</CODE>.
An entry that maps to <tt>null</tt> indicates that the
element does not appear in the given <CODE>Collection</CODE>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="iteratorToList(java.util.Iterator)"><!-- --></A><H3>
iteratorToList</H3>
<PRE>
public static java.util.List <B>iteratorToList</B>(java.util.Iterator it)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
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