/*
 *
 *    OPEN-XCHANGE legal information
 *
 *    All intellectual property rights in the Software are protected by
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 *
 *
 *    In some countries OX, OX Open-Xchange, open xchange and OXtender
 *    as well as the corresponding Logos OX Open-Xchange and OX are registered
 *    trademarks of the Open-Xchange, Inc. group of companies.
 *    The use of the Logos is not covered by the GNU General Public License.
 *    Instead, you are allowed to use these Logos according to the terms and
 *    conditions of the Creative Commons License, Version 2.5, Attribution,
 *    Non-commercial, ShareAlike, and the interpretation of the term
 *    Non-commercial applicable to the aforementioned license is published
 *    on the web site http://www.open-xchange.com/EN/legal/index.html.
 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
 *
 *    Any modifications to this package must retain all copyright notices
 *    of the original copyright holder(s) for the original code used.
 *
 *    After any such modifications, the original and derivative code shall remain
 *    under the copyright of the copyright holder(s) and/or original author(s)per
 *    the Attribution and Assignment Agreement that can be located at
 *    http://www.open-xchange.com/EN/developer/. The contributing author shall be
 *    given Attribution for the derivative code and a license granting use.
 *
 *     Copyright (C) 2004-2010 Open-Xchange, Inc.
 *     Mail: info@open-xchange.com
 *
 *
 *     This program is free software; you can redistribute it and/or modify it
 *     under the terms of the GNU General Public License, Version 2 as published
 *     by the Free Software Foundation.
 *
 *     This program is distributed in the hope that it will be useful, but
 *     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *     or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 *     for more details.
 *
 *     You should have received a copy of the GNU General Public License along
 *     with this program; if not, write to the Free Software Foundation, Inc., 59
 *     Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

package com.openexchange.mail.mime;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * {@link MimeTypeFileLineParser} - Parses entries in MIME type files like:
 * 
 * <pre>
 * type=magnus-internal/cgi	exts=cgi,exe,bat
 * </pre>
 * 
 * @author <a href="mailto:thorben.betten@open-xchange.com">Thorben Betten</a>
 */
public final class MimeTypeFileLineParser {

    private static final Pattern PAT_VAL = Pattern.compile("(?:[^\"][\\p{ASCII}&&[^\\s\"]]*|\"[\\p{ASCII}&&[^\"]]+\")");

    private String type;

    private final List<String> extensions;

    /**
     * Initializes a new MIME type file's line parser
     * 
     * @param entry The MIME type file entry; e.g. <code>type=magnus-internal/cgi&nbsp;&nbsp;&nbsp;&nbsp;exts=cgi,exe,bat</code>
     */
    public MimeTypeFileLineParser(final String entry) {
        super();
        extensions = new ArrayList<String>();
        parse(entry);
    }

    private static final String STR_TYPE = "type=";

    private static final String STR_EXTS = "exts=";

    private void parse(final String entry) {
        int pos = -1;
        if ((pos = entry.toLowerCase(Locale.ENGLISH).indexOf(STR_TYPE)) != -1) {
            final Matcher m = PAT_VAL.matcher(entry);
            final int start = pos + 5;
            if (m.find(start) && (m.start() == start)) {
                type = m.group();
            }
        }
        if ((pos = entry.toLowerCase(Locale.ENGLISH).indexOf(STR_EXTS)) != -1) {
            final Matcher m = PAT_VAL.matcher(entry);
            final int start = pos + 5;
            if (m.find(start) && (m.start() == start)) {
                final String sExts = m.group();
                final String[] exts;
                if ((sExts.charAt(0) == '"') && (sExts.charAt(sExts.length() - 1) == '"')) {
                    exts = sExts.substring(1, sExts.length() - 1).split("[ \t\n\r\f]*,[ \t\n\r\f]*");
                } else {
                    exts = m.group().split("[ \t\n\r\f]*,[ \t\n\r\f]*");
                }
                extensions.addAll(Arrays.asList(exts));
            }
        }
    }

    /**
     * Gets the extensions
     * 
     * @return the extensions
     */
    public List<String> getExtensions() {
        return Collections.unmodifiableList(extensions);
    }

    /**
     * Gets the type
     * 
     * @return the type
     */
    public String getType() {
        return type;
    }

}
