Android File Extension Name Get hasExtension(String filename, String extension)

Description

Returns whether or not the provided filename has the provided extension.

License

Apache License

Return

true if the provided file has the provided extension. false otherwise.

Declaration

public static boolean hasExtension(String filename, String extension) 

Method Source Code

/*******************************************************************************
 * Copyright 2012 Geoscience Australia//  w w w . j  av  a  2  s.c  om
 * 
 * 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.
 ******************************************************************************/


public class Main{
    /**
     * Returns whether or not the provided filename has the provided extension.
     * <p/>
     * Comparisons are case-insensitive, and '.' characters are ignored.
     * 
     * @return <code>true</code> if the provided file has the provided extension. <code>false</code> otherwise.
     */
    public static boolean hasExtension(String filename, String extension) {
        if (Util.isBlank(extension)) {
            return false;
        }

        String fileExtension = getExtension(filename);
        if (Util.isBlank(fileExtension)) {
            return false;
        }

        return fileExtension.equalsIgnoreCase(extension.replace(".", ""));
    }
    /**
     * Return the file extension of the provided filename, or <code>null</code> if
     * one does not exist.
     * <p/>
     * A file extension if defined as anything after the last period '.'
     * <p/>
     * The returned extension does <b>not</b> include the '.' character. 
     * 
     * @return The file extension of the provided filename, or <code>null</code> if none exists
     */
    public static String getExtension(String filename) {
        if (Util.isBlank(filename)) {
            return null;
        }

        if (filename.lastIndexOf('.') == -1) {
            return null;
        }

        return filename.substring(filename.lastIndexOf('.') + 1);
    }
}

Related

1. getFileExtensionFromUrl(String url)
2. getFilenameExtension(String path)
3. getNameMinusExtension(File file)
4. getPathExtension(final String path)
5. getSuffix(String f)
6. indexOfExtension(String filename)
7. isValidFileExtension(String extension)
8. parseFileExtension(String filename)
9. parseFileExtension(String filename)