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<h1 title="Package" class="title">Package&nbsp;org.apache.commons.io.comparator</h1>
<div class="docSummary">
<div class="block">This package provides various <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a> implementations
for <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io"><code>File</code></a>s.</div>
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<p>See:&nbsp;<a href="#package.description">Description</a></p>
</div>
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<table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation">
<caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/CompositeFileComparator.html" title="class in org.apache.commons.io.comparator">CompositeFileComparator</a></td>
<td class="colLast">
<div class="block">Compare two files using a set of delegate file <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/DefaultFileComparator.html" title="class in org.apache.commons.io.comparator">DefaultFileComparator</a></td>
<td class="colLast">
<div class="block">Compare two files using the <b>default</b> <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#compareTo-java.io.File-" title="class or interface in java.io"><code>File.compareTo(File)</code></a> method.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/DirectoryFileComparator.html" title="class in org.apache.commons.io.comparator">DirectoryFileComparator</a></td>
<td class="colLast">
<div class="block">Compare two files using the <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#isDirectory--" title="class or interface in java.io"><code>File.isDirectory()</code></a> method.</div>
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</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/ExtensionFileComparator.html" title="class in org.apache.commons.io.comparator">ExtensionFileComparator</a></td>
<td class="colLast">
<div class="block">Compare the file name <b>extensions</b> for order
 (see <a href="../../../../../org/apache/commons/io/FilenameUtils.html#getExtension-java.lang.String-"><code>FilenameUtils.getExtension(String)</code></a>).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/LastModifiedFileComparator.html" title="class in org.apache.commons.io.comparator">LastModifiedFileComparator</a></td>
<td class="colLast">
<div class="block">Compare the <b>last modified date/time</b> of two files for order
 (see <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#lastModified--" title="class or interface in java.io"><code>File.lastModified()</code></a>).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/NameFileComparator.html" title="class in org.apache.commons.io.comparator">NameFileComparator</a></td>
<td class="colLast">
<div class="block">Compare the <b>names</b> of two files for order (see <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#getName--" title="class or interface in java.io"><code>File.getName()</code></a>).</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/PathFileComparator.html" title="class in org.apache.commons.io.comparator">PathFileComparator</a></td>
<td class="colLast">
<div class="block">Compare the <b>path</b> of two files for order (see <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#getPath--" title="class or interface in java.io"><code>File.getPath()</code></a>).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../../../../org/apache/commons/io/comparator/SizeFileComparator.html" title="class in org.apache.commons.io.comparator">SizeFileComparator</a></td>
<td class="colLast">
<div class="block">Compare the <b>length/size</b> of two files for order (see
 <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true#length--" title="class or interface in java.io"><code>File.length()</code></a> and <a href="../../../../../org/apache/commons/io/FileUtils.html#sizeOfDirectory-java.io.File-"><code>FileUtils.sizeOfDirectory(File)</code></a>).</div>
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<a name="package.description">
<!--   -->
</a>
<h2 title="Package org.apache.commons.io.comparator Description">Package org.apache.commons.io.comparator Description</h2>
<div class="block"><p>This package provides various <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a> implementations
for <a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io"><code>File</code></a>s.
</p>
<h3>Sorting</h3>
<p>
  All the compartors include <i>convenience</i> utility <code>sort(File...)</code> and
  <code>sort(List)</code> methods.
</p>
<p>
  For example, to sort the files in a directory by name:
</p>
  <pre>
        File[] files = dir.listFiles();
        NameFileComparator.NAME_COMPARATOR.sort(files);
  </pre>
<p>
  ...alternatively you can do this in one line:
</p>
<pre>
      File[] files = NameFileComparator.NAME_COMPARATOR.sort(dir.listFiles());
</pre>

<h3>Composite Comparator</h3>
<p>
  The <a href="CompositeFileComparator.html">CompositeFileComparator</a> can be used
  to compare (and sort lists or arrays of files) by combining a number other comparators.
</p>
<p>
  For example, to sort an array of files by type (i.e. directory or file)
  and then by name:
</p>
<pre>
      CompositeFileComparator comparator =
                      new CompositeFileComparator(
                                  DirectoryFileComparator.DIRECTORY_COMPARATOR,
                                  NameFileComparator.NAME_COMPARATOR);
      File[] files = dir.listFiles();
      comparator.sort(files);
</pre>

<h3>Singleton Instances (thread-safe)</h3>
<p>
 The <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a> implementations have some <i>convenience</i>
 singleton(<i>thread-safe</i>) instances ready to use:
</p>
<ul>
   <li><a href="DefaultFileComparator.html">DefaultFileComparator</a> - default file compare:
       <ul>
          <li><a href="DefaultFileComparator.html#DEFAULT_COMPARATOR">DEFAULT_COMPARATOR</a>
              - Compare using <code>File.compareTo(File)</code> method.
          </li>
          <li><a href="DefaultFileComparator.html#DEFAULT_REVERSE">DEFAULT_REVERSE</a>
              - Reverse compare of <code>File.compareTo(File)</code> method.
          </li>
       </ul>
   </li>
   <li><a href="DirectoryFileComparator.html">DirectoryFileComparator</a> - compare by type (directory or file):
       <ul>
          <li><a href="DirectoryFileComparator.html#DIRECTORY_COMPARATOR">DIRECTORY_COMPARATOR</a>
              - Compare using <code>File.isDirectory()</code> method (directories &lt; files).
          </li>
          <li><a href="DirectoryFileComparator.html#DIRECTORY_REVERSE">DIRECTORY_REVERSE</a>
              - Reverse compare of <code>File.isDirectory()</code> method  (directories &gt;files).
          </li>
       </ul>
   </li>
   <li><a href="ExtensionFileComparator.html">ExtensionFileComparator</a> - compare file extenstions:
       <ul>
          <li><a href="ExtensionFileComparator.html#EXTENSION_COMPARATOR">EXTENSION_COMPARATOR</a>
              - Compare using <code>FilenameUtils.getExtension(String)</code> method.
          </li>
          <li><a href="ExtensionFileComparator.html#EXTENSION_REVERSE">EXTENSION_REVERSE</a>
              - Reverse compare of <code>FilenameUtils.getExtension(String)</code> method.
          </li>
          <li><a href="ExtensionFileComparator.html#EXTENSION_INSENSITIVE_COMPARATOR">EXTENSION_INSENSITIVE_COMPARATOR</a>
              - Case-insensitive compare using <code>FilenameUtils.getExtension(String)</code> method.
          </li>
          <li><a href="ExtensionFileComparator.html#EXTENSION_INSENSITIVE_REVERSE">EXTENSION_INSENSITIVE_REVERSE</a>
              - Reverse case-insensitive compare of <code>FilenameUtils.getExtension(String)</code> method.
          </li>
          <li><a href="ExtensionFileComparator.html#EXTENSION_SYSTEM_COMPARATOR">EXTENSION_SYSTEM_COMPARATOR</a>
              -  System sensitive compare using <code>FilenameUtils.getExtension(String)</code> method.
          </li>
          <li><a href="ExtensionFileComparator.html#EXTENSION_SYSTEM_REVERSE">EXTENSION_SYSTEM_REVERSE</a>
              - Reverse system sensitive compare of <code>FilenameUtils.getExtension(String)</code> method.
          </li>
       </ul>
   </li>
   <li><a href="LastModifiedFileComparator.html">LastModifiedFileComparator</a>
       - compare the file's last modified date/time:
       <ul>
          <li><a href="LastModifiedFileComparator.html#LASTMODIFIED_COMPARATOR">LASTMODIFIED_COMPARATOR</a>
              - Compare using <code>File.lastModified()</code> method.
          </li>
          <li><a href="LastModifiedFileComparator.html#LASTMODIFIED_REVERSE">LASTMODIFIED_REVERSE</a>
              - Reverse compare of <code>File.lastModified()</code> method.
          </li>
       </ul>
   </li>
    <li><a href="NameFileComparator.html">NameFileComparator</a> - compare file names:
       <ul>
          <li><a href="NameFileComparator.html#NAME_COMPARATOR">NAME_COMPARATOR</a>
              - Compare using <code>File.getName()</code> method.
          </li>
          <li><a href="NameFileComparator.html#NAME_REVERSE">NAME_REVERSE</a>
              - Reverse compare of <code>File.getName()</code> method.
          </li>
          <li><a href="NameFileComparator.html#NAME_INSENSITIVE_COMPARATOR">NAME_INSENSITIVE_COMPARATOR</a>
              - Case-insensitive compare using <code>File.getName()</code> method.
          </li>
          <li><a href="NameFileComparator.html#NAME_INSENSITIVE_REVERSE">NAME_INSENSITIVE_REVERSE</a>
              - Reverse case-insensitive compare of <code>File.getName()</code> method.
          </li>
          <li><a href="NameFileComparator.html#NAME_SYSTEM_COMPARATOR">NAME_SYSTEM_COMPARATOR</a>
              -  System sensitive compare using <code>File.getName()</code> method.
          </li>
          <li><a href="NameFileComparator.html#NAME_SYSTEM_REVERSE">NAME_SYSTEM_REVERSE</a>
              - Reverse system sensitive compare of <code>File.getName()</code> method.
          </li>
       </ul>
   </li>
    <li><a href="PathFileComparator.html">PathFileComparator</a> - compare file paths:
       <ul>
          <li><a href="PathFileComparator.html#PATH_COMPARATOR">PATH_COMPARATOR</a>
              - Compare using <code>File.getPath()</code> method.
          </li>
          <li><a href="PathFileComparator.html#PATH_REVERSE">PATH_REVERSE</a>
              - Reverse compare of <code>File.getPath()</code> method.
          </li>
          <li><a href="PathFileComparator.html#PATH_INSENSITIVE_COMPARATOR">PATH_INSENSITIVE_COMPARATOR</a>
              - Case-insensitive compare using <code>File.getPath()</code> method.
          </li>
          <li><a href="PathFileComparator.html#PATH_INSENSITIVE_REVERSE">PATH_INSENSITIVE_REVERSE</a>
              - Reverse case-insensitive compare of <code>File.getPath()</code> method.
          </li>
          <li><a href="PathFileComparator.html#PATH_SYSTEM_COMPARATOR">PATH_SYSTEM_COMPARATOR</a>
              -  System sensitive compare using <code>File.getPath()</code> method.
          </li>
          <li><a href="PathFileComparator.html#PATH_SYSTEM_REVERSE">PATH_SYSTEM_REVERSE</a>
              - Reverse system sensitive compare of <code>File.getPath()</code> method.
          </li>
       </ul>
   </li>
   <li><a href="SizeFileComparator.html">SizeFileComparator</a> - compare the file's size:
       <ul>
          <li><a href="SizeFileComparator.html#SIZE_COMPARATOR">SIZE_COMPARATOR</a>
              - Compare using <code>File.length()</code> method (directories treated as zero length).
          </li>
          <li><a href="SizeFileComparator.html#SIZE_REVERSE">LASTMODIFIED_REVERSE</a>
              - Reverse compare of <code>File.length()</code> method (directories treated as zero length).
          </li>
          <li><a href="SizeFileComparator.html#SIZE_SUMDIR_COMPARATOR">SIZE_SUMDIR_COMPARATOR</a>
              - Compare using <code>FileUtils.sizeOfDirectory(File)</code> method
               (sums the size of a directory's contents).
          </li>
          <li><a href="SizeFileComparator.html#SIZE_SUMDIR_REVERSE">SIZE_SUMDIR_REVERSE</a>
              - Reverse compare of <code>FileUtils.sizeOfDirectory(File)</code> method
               (sums the size of a directory's contents).
          </li>
       </ul>
   </li>
</ul></div>
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