/**
 * All rights reserved. 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.
 */

package org.jivesoftware.smack.util;


/**
 * A Base 64 encoding implementation that generates filename and Url safe encodings.
 * 
 * <p>
 * Note: This does NOT produce standard Base 64 encodings, but a variant as defined in 
 * Section 4 of RFC3548:
 * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
 * 
 * @author Robin Collier
 */
public class Base64FileUrlEncoder implements StringEncoder {

    private static Base64FileUrlEncoder instance = new Base64FileUrlEncoder();

    private Base64FileUrlEncoder() {
        // Use getInstance()
    }

    public static Base64FileUrlEncoder getInstance() {
        return instance;
    }

    public String encode(String s) {
        return Base64.encodeBytes(s.getBytes(), Base64.URL_SAFE);
    }

    public String decode(String s) {
        return new String(Base64.decode(s, Base64.URL_SAFE));
    }

}