| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.apache.commons.compress.utils; |
| |
| import java.io.File; |
| |
| /** |
| * Generic file name utilities. |
| * @since 1.20 |
| */ |
| public class FileNameUtils { |
| |
| /** |
| * Returns the extension (i.e. the part after the last ".") of a file. |
| * |
| * <p>Will return an empty string if the file name doesn't contain |
| * any dots. Only the last segment of a the file name is consulted |
| * - i.e. all leading directories of the {@code filename} |
| * parameter are skipped.</p> |
| * |
| * @return the extension of filename |
| * @param filename the name of the file to obtain the extension of. |
| */ |
| public static String getExtension(final String filename) { |
| if (filename == null) { |
| return null; |
| } |
| |
| final String name = new File(filename).getName(); |
| final int extensionPosition = name.lastIndexOf('.'); |
| if (extensionPosition < 0) { |
| return ""; |
| } |
| return name.substring(extensionPosition + 1); |
| } |
| |
| /** |
| * Returns the basename (i.e. the part up to and not including the |
| * last ".") of the last path segment of a filename. |
| * |
| * <p>Will return the file name itself if it doesn't contain any |
| * dots. All leading directories of the {@code filename} parameter |
| * are skipped.</p> |
| * |
| * @return the basename of filename |
| * @param filename the name of the file to obtain the basename of. |
| */ |
| public static String getBaseName(final String filename) { |
| if (filename == null) { |
| return null; |
| } |
| |
| final String name = new File(filename).getName(); |
| |
| final int extensionPosition = name.lastIndexOf('.'); |
| if (extensionPosition < 0) { |
| return name; |
| } |
| |
| return name.substring(0, extensionPosition); |
| } |
| } |