001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.gwt.shared;
029
030import java.io.UnsupportedEncodingException;
031
032import com.google.common.io.BaseEncoding;
033
034/**
035 * Encodes/decodes the configuration passed to the data view popup as a request parameter.<p>
036 */
037public final class CmsDataViewParamEncoder {
038
039    /** The encoding. */
040    public static final BaseEncoding CODEC = BaseEncoding.base64Url().withPadChar('.');
041
042    /**
043     * Hidden default constructor.<p>
044     */
045    private CmsDataViewParamEncoder() {
046        // do nothing
047    }
048
049    /**
050     * Decodes a string.<p>
051     *
052     * @param s the encoded string
053     * @return the decoded string
054     */
055    public static String decodeString(String s) {
056
057        try {
058            return new String(CODEC.decode(s), "UTF-8");
059        } catch (UnsupportedEncodingException e) {
060            // shouldn't happen
061            return null;
062        }
063    }
064
065    /**
066     * Encodes a string.<p>
067     *
068     * @param s the input string
069     * @return the encoded string
070     */
071    public static String encodeString(String s) {
072
073        try {
074            return CODEC.encode(s.getBytes("UTF-8"));
075        } catch (UnsupportedEncodingException e) {
076            // shouldn't happen
077            return null;
078        }
079    }
080
081}