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package cgeo.geocaching.utils;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import android.os.Handler;
import android.os.Message;
import java.io.File;
import java.util.List;
/**
* Utility class for files
*
*/
public final class FileUtils {
private FileUtils() {
// utility class
}
public static void listDir(List<File> result, File directory, FileSelector chooser, Handler feedBackHandler) {
if (directory == null || !directory.isDirectory() || !directory.canRead()
|| result == null
|| chooser == null) {
return;
}
final File[] files = directory.listFiles();
if (ArrayUtils.isNotEmpty(files)) {
for (File file : files) {
if (chooser.shouldEnd()) {
return;
}
if (!file.canRead()) {
continue;
}
String name = file.getName();
if (file.isFile()) {
if (chooser.isSelected(file)) {
result.add(file); // add file to list
}
} else if (file.isDirectory()) {
if (name.charAt(0) == '.') {
continue; // skip hidden directories
}
if (name.length() > 16) {
name = name.substring(0, 14) + '…';
}
if (feedBackHandler != null) {
feedBackHandler.sendMessage(Message.obtain(feedBackHandler, 0, name));
}
listDir(result, file, chooser, feedBackHandler); // go deeper
}
}
}
}
public static abstract class FileSelector {
public abstract boolean isSelected(File file);
public abstract boolean shouldEnd();
}
/**
* Create a unique non existing file named like the given file name. If a file with the given name already exists,
* add a number as suffix to the file name.<br>
* Example: For the file name "file.ext" this will return the first file of the list
* <ul>
* <li>file.ext</li>
* <li>file_2.ext</li>
* <li>file_3.ext</li>
* </ul>
* which does not yet exist.
*/
public static File getUniqueNamedFile(final String baseNameAndPath) {
String extension = StringUtils.substringAfterLast(baseNameAndPath, ".");
String pathName = StringUtils.substringBeforeLast(baseNameAndPath, ".");
int number = 1;
while (new File(getNumberedFileName(pathName, extension, number)).exists()) {
number++;
}
return new File(getNumberedFileName(pathName, extension, number));
}
private static String getNumberedFileName(String pathName, String extension, int number) {
return pathName + (number > 1 ? "_" + Integer.toString(number) : "") + "." + extension;
}
}
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