Android File Name Get getFileName(String path)

Description

Return the filename component of the provided string path, if one exists.

License

Apache License

Parameter

Parameter	Description
path	the string path to extract the filename from

Return

The filename component of the provided path, or null if none exists.

Declaration

public static String getFileName(String path) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2013 Geoscience Australia/*from   w  w w .j a  va 2s.  c  o m*/
 * 
 * Licensed 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.
 ******************************************************************************/

import java.util.regex.Pattern;

public class Main {
    private static final String FILE_PATH_PATTERN = "(file://)?[a-zA-Z]:[/\\\\]([^/\\\\]+[/\\\\]?)+";

    /**
     * Return the filename component of the provided string path, if one exists.
     * 
     * @param path
     *            the string path to extract the filename from
     * 
     * @return The filename component of the provided path, or <code>null</code>
     *         if none exists.
     */
    public static String getFileName(String path) {
        if (!isLikelyFilePath(path)) {
            return null;
        }

        String[] components = path.split("\\\\|/"); //$NON-NLS-1$
        return components[components.length - 1];
    }

    /**
     * Return whether or not the provided string is possibly a valid file path.
     * <p/>
     * Note that this method is purely a pattern-based heuristic and doesn't
     * attempt to query the file system for a file's existence.
     * 
     * @param s
     *            The string to test
     * 
     * @return <code>true</code> if the string is likely a valid file path;
     *         <code>false</code> otherwise.
     */
    public static boolean isLikelyFilePath(String s) {
        if (s == null || s.trim().length() == 0) {
            return false;
        }

        return Pattern.matches(FILE_PATH_PATTERN, s);
    }
}

Related

1. getFileName(String fileName)
2. getFileName(String filePath)
3. getRandomFileName(String prefix, String suffix)
4. parseFileName(String path)
5. getSuffix(File file)
6. getSuffix(String fileName)