Java File Name Get getFilename(File file)

Description

return filename without the path.

License

Open Source License

Parameter

Parameter	Description
file	is a file such as <code>/home/data/a.dat</code>

Return

File the filename only. i.e. if "/home/data/abc.dat" is passed to this method it will return "abc.dat"

Declaration

public static String getFilename(File file) 

Method Source Code

//package com.java2s;
/*//from  w w  w.j  av  a 2 s .  co m
 * License information at https://github.com/Caltech-IPAC/firefly/blob/master/License.txt
 */

import java.io.*;

public class Main {
    /**
     * return filename without the path.
     *
     * @param file is a file such as <code>/home/data/a.dat</code>
     * @return File the filename only. i.e. if "/home/data/abc.dat" is
     *         passed to this method it will return "abc.dat"
     */
    public static String getFilename(File file) {
        String ext = getExtension(file);
        String base = getBase(file);
        return setExtension(ext, base);
    }

    /**
     * Get the extension of a filename.
     * @param  s a file name such as <code>a.dat</code>
     * @return String the extension of the file.
     *                A null is returned if there is no extension; 
     *                
     */
    public static String getExtension(String s) {
        String ext = null;
        int i = s.lastIndexOf('.');
        if (i > 0 && i < s.length() - 1) {
            ext = s.substring(i + 1).toLowerCase();
        }
        return ext;
    }

    /**
     * Get the extension of a file.
     * @param  f a file such as <code>a.dat</code>
     * @return String the extension of the file.
     *                A null is returned if there is no extension
     *                
     */
    public static String getExtension(File f) {
        return getExtension(f.getName());
    }

    /**
     * Get the name of of a filename without the extension.
     * @param  s a file name such as <code>a.dat</code>
     * @return String the base name of the file. i.e. if "abc.dat" is
     *                passed to this method it will return "abc"
     *                A null is returned if there is no base;
     *                
     */
    public static String getBase(String s) {
        String base;
        int i = s.lastIndexOf('.');
        if (i == -1 || i == 0) {
            base = s;
        } else {
            base = s.substring(0, i);
        }
        return base;
    }

    /**
     * Get the name of of a filename without the extension. 
     * @param  f a file name such as <code>a.dat</code>
     * @return String the base name of the file. i.e. if "abc.dat" is
     *                passed to this method it will return "abc"
     *                A null is returned if there is no base;
     *                
     */
    public static String getBase(File f) {
        return getBase(f.getName());
    }

    /**
     * Set the extension of a filename.
     * @param  extensionName the extension to be replaced or added.
     * @param  fileName a file name such as <code>xxxx.dat</code> or
              <code>xxx</code>
     * @param  replace if true replace the filename extension (if it
               has one) with the specified extension, otherwise
               just add the extension to the filename.
     * @return String The file with the specified extension.
     */
    public static String setExtension(String extensionName, String fileName, boolean replace) {
        int dotPosition = fileName.lastIndexOf(".");
        String newFileName;
        //AR253: TLau 08/02/10 no extension to set if extensionName is null.
        if (extensionName == null)
            return fileName;

        if (dotPosition == -1) {
            newFileName = fileName + "." + extensionName;
        } else if (replace) {
            newFileName = fileName.substring(0, dotPosition + 1) + extensionName;
        } else { // has extension && !replace
            newFileName = fileName + "." + extensionName;
        }

        return newFileName;
    }

    public static File setExtension(String extensionName, File fileName, boolean replace) {
        return new File(setExtension(extensionName, fileName.getPath(), replace));
    }

    /**
     * Set the extension of a filename.  If the file already has
     * an extension the replace the extension with the specified
     * one.
     * @param  extensionName a file name such as <code>xxxx.dat</code> or
              <code>xxx</code>
     * @param  fileName the extension to be replaced or added.
     * @return String The file with the specified extension.
     */
    public static String setExtension(String extensionName, String fileName) {
        return setExtension(extensionName, fileName, true);
    }
}

Related

1. getFilename(File file)
2. getFileName(File file)
3. getFileName(File file)
4. getFilename(File file)
5. getFilename(File file)
6. getFileName(File file)
7. getFileName(File file)
8. getFileName(File file)
9. getFilename(File file, boolean withExtension)