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Directory.java

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import java.util.regex.*;

import java.io.*;

import java.util.*;

public final class Directory {

public static File[] local(File dir, final String regex) {

return dir.listFiles(new FilenameFilter() {

private Pattern pattern = Pattern.compile(regex);

public boolean accept(File dir, String name) {

return pattern.matcher(

new File(name).getName()).matches();

}

});

}

public static File[] local(String path, final String regex) { // Overloaded

return local(new File(path), regex);

}

// A two-tuple for returning a pair of objects:

public static class TreeInfo implements Iterable<File> {

public List<File> files = new ArrayList<File>();

public List<File> dirs = new ArrayList<File>();

// The default iterable element is the file list:

public Iterator<File> iterator() {

return files.iterator();

}

void addAll(TreeInfo other) {

files.addAll(other.files);

dirs.addAll(other.dirs);

}

public String toString() {

return "dirs: " + PPrint.pformat(dirs) +

"\n\nfiles: " + PPrint.pformat(files);

}

}

public static TreeInfo walk(String start, String regex) { // Begin recursion

return recurseDirs(new File(start), regex);

}

public static TreeInfo walk(File start, String regex) { // Overloaded

return recurseDirs(start, regex);

}

public static TreeInfo walk(File start) { // Everything

return recurseDirs(start, ".*");

}

public static TreeInfo walk(String start) {

return recurseDirs(new File(start), ".*");

}

static TreeInfo recurseDirs(File startDir, String regex) {

TreeInfo result = new TreeInfo();

for (File item : startDir.listFiles()) {

if (item.isDirectory()) {

result.dirs.add(item);

result.addAll(recurseDirs(item, regex));

} else // Regular file

if (item.getName().matches(regex))

result.files.add(item);

}

return result;

}

// Simple validation test:

public static void main(String[] args) {

if (args.length == 0)

System.out.println(walk("."));

else

for (String arg : args)

System.out.println(walk(arg));

}

}

class PPrint {

public static String pformat(Collection<?> c) {

if (c.size() == 0)

return "[]";

StringBuilder result = new StringBuilder("[");

for (Object elem : c) {

if (c.size() != 1)

result.append("\n ");

result.append(elem);

}

if (c.size() != 1)

result.append("\n");

result.append("]");

return result.toString();

}

public static void pprint(Collection<?> c) {

System.out.println(pformat(c));

}

public static void pprint(Object[] c) {

System.out.println(pformat(Arrays.asList(c)));

}

}