/*license*\
XBN-Java: Copyright (C) 2014, Jeff Epstein (aliteralmind __DASH__ github __AT__ yahoo __DOT__ com)
This software is dual-licensed under the:
- Lesser General Public License (LGPL) version 3.0 or, at your option, any later version;
- Apache Software License (ASL) version 2.0.
Either license may be applied at your discretion. More information may be found at
- http://en.wikipedia.org/wiki/Multi-licensing.
The text of both licenses is available in the root directory of this project, under the names "LICENSE_lgpl-3.0.txt" and "LICENSE_asl-2.0.txt". The latest copies may be downloaded at:
- LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
- ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
\*license*/
package com.github.xbn.examples.io.non_xbn;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.TreeMap;
import org.apache.commons.io.FileUtils;
/**
<p>Demonstration of listing all files in a directory, in size order, using a {@link java.util.Map} in which each item is a list of values (multiple values per key). This is an answer to (viewed 1/2/2014)
<br/> {@code <a href="http://stackoverflow.com/questions/20889571/java-list-of-subdirectories-and-files-within-a-path-size">http://stackoverflow.com/questions/20889571/java-list-of-subdirectories-and-files-within-a-path-size</a>}</p>
<p>java com.github.xbn.examples.io.SizeOrderAllFilesInDirXmpl</p>
* @since 0.1.0
* @author Copyright (C) 2014, Jeff Epstein ({@code aliteralmind __DASH__ github __AT__ yahoo __DOT__ com}), dual-licensed under the LGPL (version 3.0 or later) or the ASL (version 2.0). See source code for details. <a href="http://xbnjava.aliteralmind.com">{@code http://xbnjava.aliteralmind.com}</a>, <a href="https://github.com/aliteralmind/xbnjava">{@code https://github.com/aliteralmind/xbnjava}</a>
**/
public class SizeOrderAllFilesInDirXmpl {
public static final void main(String[] ignored) {
File fDir = (new File("R:\\jeffy\\programming\\sandbox\\xbnjava\\xbn\\"));
Collection<File> cllf = FileUtils.listFiles(fDir, (new String[]{"java"}), true);
//Add all file paths to a Map, keyed by size.
//It's actually a map of lists-of-files, to
//allow multiple files that happen to have the
//same length.
TreeMap<Long,List<File>> tmFilesBySize = new TreeMap<Long,List<File>>();
Iterator<File> itrf = cllf.iterator();
while(itrf.hasNext()) {
File f = itrf.next();
Long LLen = f.length();
if(!tmFilesBySize.containsKey(LLen)) {
ArrayList<File> alf = new ArrayList<File>();
alf.add(f);
tmFilesBySize.put(LLen, alf);
} else {
tmFilesBySize.get(LLen).add(f);
}
}
//Iterate backwards by key through the map. For each
//List<File>, iterate through the files, printing out
//its size and path.
ArrayList<Long> alSize = new ArrayList<Long>(tmFilesBySize.keySet());
for(int i=alSize.size() - 1; i >= 0; i--) {
itrf = tmFilesBySize.get(alSize.get(i)).iterator();
while(itrf.hasNext()) {
File f = itrf.next();
System.out.println(f.length() + ": " + f.getPath());
}
}
}
}