/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2001-2015 The eXist Project
 *  http://exist-db.org
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.config.annotation;

import java.lang.annotation.*;

/**
 * @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
 *
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ConfigurationFieldSettings {

    String OCTAL_STRING_KEY = "octalString";
    String RADIX_KEY = "radix";

    String KEY_VALUE_SEP = "=";

    String value();

    enum SettingKey {
        OCTAL_STRING(OCTAL_STRING_KEY),
        RADIX(RADIX_KEY);

        private final String key;
        SettingKey(final String key) {
            this.key = key;
        }

        public String getKey() {
            return key;
        }

        public String extractValueFromSettings(final String settings) {
              return settings.substring(getKey().length() + KEY_VALUE_SEP.length());
        }

        public static SettingKey forSettings(final String settings) {
            if(settings.contains(KEY_VALUE_SEP)) {
                return forKey(settings.substring(0, settings.indexOf(KEY_VALUE_SEP)));
            } else {
                return forKey(settings);
            }
        }

        public static SettingKey forKey(final String key) {
            for(final SettingKey settingKey : SettingKey.values()) {
                if(settingKey.getKey().equals(key)) {
                    return settingKey;
                }
            }
            throw new IllegalArgumentException("No such Setting for key: " + key);
        }
    }
}