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<h2 title="Class CollectionUtils" class="title">Class CollectionUtils</h2>
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<pre>public class <span class="strong">CollectionUtils</span>
extends <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<dl><dt><span class="strong">Version:</span></dt>
<dd>$Id$</dd>
<dt><span class="strong">Author:</span></dt>
<dd><a href="mailto:olamy@codehaus.org">olamy</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#CollectionUtils()">CollectionUtils</a></strong>()</code> </td>
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<td class="colFirst"><code>static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><E,<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#getCardinalityMap(java.util.Collection)">getCardinalityMap</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> col)</code>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>Map</code></a> mapping each unique element in
the given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> to an <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang"><code>Integer</code></a>
representing the number of occurances of that element
in the <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>.</div>
</td>
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<td class="colFirst"><code>static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#intersection(java.util.Collection,%20java.util.Collection)">intersection</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> a,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> b)</code>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> containing the intersection
of the given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>s.</div>
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<td class="colFirst"><code>static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><E></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#iteratorToList(java.util.Iterator)">iteratorToList</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><E> it)</code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>static <K,V> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#mergeMaps(java.util.Map[])">mergeMaps</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V>[] maps)</code>
<div class="block">Take a series of <code>Map</code>s and merge
them where the ordering of the array from 0..n
is the dominant order.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>static <K,V> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#mergeMaps(java.util.Map,%20java.util.Map)">mergeMaps</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> dominantMap,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> recessiveMap)</code>
<div class="block">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.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static <T> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T></code></td>
<td class="colLast"><code><strong><a href="../../../../org/codehaus/plexus/util/CollectionUtils.html#subtract(java.util.Collection,%20java.util.Collection)">subtract</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T> a,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T> b)</code>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> containing <tt><i>a</i> - <i>b</i></tt>.</div>
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<h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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 CollectionUtils()</pre>
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<pre>public static <K,V> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> mergeMaps(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> dominantMap,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> recessiveMap)</pre>
<div class="block">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 }</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dominantMap</code> - Dominant Map.</dd><dd><code>recessiveMap</code> - Recessive Map.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The result map with combined dominant and recessive values.</dd></dl>
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<pre>public static <K,V> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V> mergeMaps(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><K,V>[] maps)</pre>
<div class="block">Take a series of <code>Map</code>s and merge
them where the ordering of the array from 0..n
is the dominant order.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>maps</code> - An array of Maps to merge.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Map The result Map produced after the merging process.</dd></dl>
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<pre>public static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> intersection(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> a,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> b)</pre>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> containing the intersection
of the given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>s.
<p>
The cardinality of each element in the returned <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>
will be equal to the minimum of the cardinality of that element
in the two given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>s.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - The first collection</dd><dd><code>b</code> - The second collection</dd>
<dt><span class="strong">Returns:</span></dt><dd>The intersection of a and b, never null</dd><dt><span class="strong">See Also:</span></dt><dd><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true#retainAll(java.util.Collection)" title="class or interface in java.util"><code>Collection.retainAll(java.util.Collection<?>)</code></a></dd></dl>
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<pre>public static <T> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T> subtract(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T> a,
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><T> b)</pre>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> containing <tt><i>a</i> - <i>b</i></tt>.
The cardinality of each element <i>e</i> in the returned <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>
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.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - The start collection</dd><dd><code>b</code> - The collection that will be subtracted</dd>
<dt><span class="strong">Returns:</span></dt><dd>The result of the subtraction</dd><dt><span class="strong">See Also:</span></dt><dd><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true#removeAll(java.util.Collection)" title="class or interface in java.util"><code>Collection.removeAll(java.util.Collection<?>)</code></a></dd></dl>
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<h4>getCardinalityMap</h4>
<pre>public static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><E,<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> getCardinalityMap(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><E> col)</pre>
<div class="block">Returns a <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util"><code>Map</code></a> mapping each unique element in
the given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a> to an <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang"><code>Integer</code></a>
representing the number of occurances of that element
in the <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>.
An entry that maps to <tt>null</tt> indicates that the
element does not appear in the given <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util"><code>Collection</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>col</code> - The collection to count cardinalities for</dd>
<dt><span class="strong">Returns:</span></dt><dd>A map of counts, indexed on each element in the collection</dd></dl>
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<h4>iteratorToList</h4>
<pre>public static <E> <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><E> iteratorToList(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><E> it)</pre>
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