001/**
002 *
003 * Copyright the original author or authors
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.util;
018
019
020/**
021 * A Base 64 encoding implementation that generates filename and Url safe encodings.
022 * 
023 * <p>
024 * Note: This does NOT produce standard Base 64 encodings, but a variant as defined in 
025 * Section 4 of RFC3548:
026 * <a href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org/rfcs/rfc3548.html</a>.
027 * 
028 * @author Robin Collier
029 */
030public class Base64FileUrlEncoder implements StringEncoder {
031
032    private static Base64FileUrlEncoder instance = new Base64FileUrlEncoder();
033
034    private Base64FileUrlEncoder() {
035        // Use getInstance()
036    }
037
038    public static Base64FileUrlEncoder getInstance() {
039        return instance;
040    }
041
042    public String encode(String s) {
043        return Base64.encodeBytes(s.getBytes(), Base64.URL_SAFE);
044    }
045
046    public String decode(String s) {
047        return new String(Base64.decode(s, Base64.URL_SAFE));
048    }
049
050}