com.google.appinventor.common.utils.FilenameUtils.java Source code

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Here is the source code for com.google.appinventor.common.utils.FilenameUtils.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the MIT License https://raw.github.com/mit-cml/app-inventor/master/mitlicense.txt

package com.google.appinventor.common.utils;

import com.google.common.base.Preconditions;

/**
 * Helper class for working with filenames.
 *
 */
public class FilenameUtils {

    private FilenameUtils() {
    }

    /**
     * Returns the extension of a filename.
     *
     * @param filename  filename to get extension of
     * @return  extension of filename
     */
    public static String getExtension(String filename) {
        Preconditions.checkNotNull(filename);

        // Separate filename from rest of pathname
        filename = filename.substring(filename.lastIndexOf('/') + 1);

        // Extract extension
        int index = filename.lastIndexOf('.');
        return index == -1 ? "" : filename.substring(index + 1);
    }
}