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/*
* SonarQube
* Copyright (C) 2009-2024 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonarqube.ws;
import static java.util.Objects.requireNonNull;
/**
* Extracted from org.apache.commons.io.FilenameUtils
*/
public class FilenameUtils {
private static final int NOT_FOUND = -1;
private static final char EXTENSION_SEPARATOR = '.';
/**
* The Unix separator character.
*/
private static final char UNIX_SEPARATOR = '/';
/**
* The Windows separator character.
*/
private static final char WINDOWS_SEPARATOR = '\\';
private FilenameUtils() {
// Only static methods here
}
public static String getExtension(String filename) {
requireNonNull(filename);
final int index = indexOfExtension(filename);
if (index == NOT_FOUND) {
return "";
} else {
return filename.substring(index + 1);
}
}
private static int indexOfExtension(String filename) {
final int extensionPos = filename.lastIndexOf(EXTENSION_SEPARATOR);
final int lastSeparator = indexOfLastSeparator(filename);
return lastSeparator > extensionPos ? NOT_FOUND : extensionPos;
}
private static int indexOfLastSeparator(String filename) {
final int lastUnixPos = filename.lastIndexOf(UNIX_SEPARATOR);
final int lastWindowsPos = filename.lastIndexOf(WINDOWS_SEPARATOR);
return Math.max(lastUnixPos, lastWindowsPos);
}
}
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