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<title>ParallelSorter (cglib (Version 3.1))</title>
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<div class="subTitle">net.sf.cglib.util</div>
<h2 title="Class ParallelSorter" class="title">Class ParallelSorter</h2>
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<pre>public abstract class <span class="strong">ParallelSorter</span>
extends java.lang.Object</pre>
<div class="block">For the efficient sorting of multiple arrays in parallel.
<p>
Given two arrays of equal length and varying types, the standard
technique for sorting them in parallel is to create a new temporary
object for each row, store the objects in a temporary array, sort the
array using a custom comparator, and the extract the original values
back into their respective arrays. This is wasteful in both time and
memory.
<p>
This class generates bytecode customized to the particular set of
arrays you need to sort, in such a way that both arrays are sorted
in-place, simultaneously.
<p>
Two sorting algorithms are provided.
Quicksort is best when you only need to sort by a single column, as
it requires very few comparisons and swaps. Mergesort is best used
when sorting multiple columns, as it is a "stable" sort--that is, it
does not affect the relative order of equal objects from previous sorts.
<p>
The mergesort algorithm here is an "in-place" variant, which while
slower, does not require a temporary array.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Chris Nokleberg</dd></dl>
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<td class="colFirst"><code>static <a href="../../../../net/sf/cglib/util/ParallelSorter.html" title="class in net.sf.cglib.util">ParallelSorter</a></code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#create(java.lang.Object[])">create</a></strong>(java.lang.Object[] arrays)</code>
<div class="block">Create a new ParallelSorter object for a set of arrays.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#mergeSort(int)">mergeSort</a></strong>(int index)</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#mergeSort(int, java.util.Comparator)">mergeSort</a></strong>(int index,
java.util.Comparator cmp)</code>
<div class="block">Sort the arrays using an in-place merge sort.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#mergeSort(int, int, int)">mergeSort</a></strong>(int index,
int lo,
int hi)</code>
<div class="block">Sort the arrays using an in-place merge sort.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#mergeSort(int, int, int, java.util.Comparator)">mergeSort</a></strong>(int index,
int lo,
int hi,
java.util.Comparator cmp)</code>
<div class="block">Sort the arrays using an in-place merge sort.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../net/sf/cglib/util/ParallelSorter.html" title="class in net.sf.cglib.util">ParallelSorter</a></code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#newInstance(java.lang.Object[])">newInstance</a></strong>(java.lang.Object[] arrays)</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#quickSort(int)">quickSort</a></strong>(int index)</code>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#quickSort(int, java.util.Comparator)">quickSort</a></strong>(int index,
java.util.Comparator cmp)</code>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#quickSort(int, int, int)">quickSort</a></strong>(int index,
int lo,
int hi)</code>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../net/sf/cglib/util/ParallelSorter.html#quickSort(int, int, int, java.util.Comparator)">quickSort</a></strong>(int index,
int lo,
int hi,
java.util.Comparator cmp)</code>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
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<pre>public abstract <a href="../../../../net/sf/cglib/util/ParallelSorter.html" title="class in net.sf.cglib.util">ParallelSorter</a> newInstance(java.lang.Object[] arrays)</pre>
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<pre>public static <a href="../../../../net/sf/cglib/util/ParallelSorter.html" title="class in net.sf.cglib.util">ParallelSorter</a> create(java.lang.Object[] arrays)</pre>
<div class="block">Create a new ParallelSorter object for a set of arrays. You may
sort the arrays multiple times via the same ParallelSorter object.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>arrays</code> - An array of arrays to sort. The arrays may be a mix
of primitive and non-primitive types, but should all be the same
length.</dd><dd><code>loader</code> - ClassLoader for generated class, uses "current" if null</dd></dl>
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<pre>public void quickSort(int index)</pre>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd></dl>
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<pre>public void quickSort(int index,
int lo,
int hi)</pre>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>lo</code> - starting array index (row), inclusive</dd><dd><code>hi</code> - ending array index (row), exclusive</dd></dl>
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<h4>quickSort</h4>
<pre>public void quickSort(int index,
java.util.Comparator cmp)</pre>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>cmp</code> - Comparator to use if the specified column is non-primitive</dd></dl>
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<pre>public void quickSort(int index,
int lo,
int hi,
java.util.Comparator cmp)</pre>
<div class="block">Sort the arrays using the quicksort algorithm.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>lo</code> - starting array index (row), inclusive</dd><dd><code>hi</code> - ending array index (row), exclusive</dd><dd><code>cmp</code> - Comparator to use if the specified column is non-primitive</dd></dl>
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<pre>public void mergeSort(int index)</pre>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd></dl>
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<h4>mergeSort</h4>
<pre>public void mergeSort(int index,
int lo,
int hi)</pre>
<div class="block">Sort the arrays using an in-place merge sort.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>lo</code> - starting array index (row), inclusive</dd><dd><code>hi</code> - ending array index (row), exclusive</dd></dl>
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<h4>mergeSort</h4>
<pre>public void mergeSort(int index,
java.util.Comparator cmp)</pre>
<div class="block">Sort the arrays using an in-place merge sort.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>lo</code> - starting array index (row), inclusive</dd><dd><code>hi</code> - ending array index (row), exclusive</dd></dl>
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<h4>mergeSort</h4>
<pre>public void mergeSort(int index,
int lo,
int hi,
java.util.Comparator cmp)</pre>
<div class="block">Sort the arrays using an in-place merge sort.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>index</code> - array (column) to sort by</dd><dd><code>lo</code> - starting array index (row), inclusive</dd><dd><code>hi</code> - ending array index (row), exclusive</dd><dd><code>cmp</code> - Comparator to use if the specified column is non-primitive</dd></dl>
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