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RFC 3987 (Internationlaized Resource Identifier) libraries.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  The ASF licenses this file to You
 * 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.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.abdera.i18n.rfc4646.enums;

import java.util.Locale;

import org.apache.abdera.i18n.rfc4646.Subtag;

/**
 * Enum constants used to validate language tags
 */
public enum Variant {

    _1606NICT(null, null, "frm", "Late Middle French (to 1606)"), _1694ACAD(null, null, "fr", "Early Modern French"), _1901(
        null, null, "de", "Traditional German orthography"), _1994(null, null, new String[] {"sl-rozaj",
                                                                                             "sl-rozaj-biske",
                                                                                             "sl-rozaj-njiva",
                                                                                             "sl-rozaj-osojs",
                                                                                             "sl-rozaj-solba"},
        "Standardized Resian orthography"), _1996(null, null, "de", "German orthography of 1996"), AREVELA(null, null,
        "hy", "Eastern Armenian"), AREVMDA(null, null, "hy", "Western Armenian"), BAKU1926(null, null,
        new String[] {"az", "ba", "crh", "kk", "krc", "ky", "sah", "tk", "tt", "uz"},
        "Unified Turkic Latin Alphabet (Historical)"), BISKE(null, null, "sl-rozaj",
        "The San Giorgio dialect of Resian", "The Bila dialect of Resian"), BOONT(null, null, "en", "Boontling"), FONIPA(
        null, null, (String)null, "International Phonetic Alphabet"), FONUPA(null, null, (String)null,
        "Uralic Phonetic Alphabet"), LIPAW(null, null, "sl-rozaj", "The Lipovaz dialect of Resian",
        "The Lipovec dialect of Resian"), MONOTON(null, null, "el", "Monotonic Greek"), NEDIS(null, null, "sl",
        "Natisone dialect", "Nadiza dialect"), NJIVA(null, null, "sl-rozaj", "The Gniva dialect of Resian",
        "The Njiva dialect of Resian"), OSOJS(null, null, "sl-rozaj", "The Oseacco dialect of Resian",
        "The Osojane dialect of Resian"), POLYTON(null, null, "el", "Polytonic Greek"), ROZAJ(null, null, "sl",
        "Resian", "Resianic", "Rezijan"), SCOTLAND(null, null, "en", "Scottish Standard English"), SCOUSE(null, null,
        "en", "Scouse"), SOLBA(null, null, "sl-rozaj", "The Stolvizza dialect of Resian",
        "The Solbica dialect of Resian"), TARASK(null, null, "be", "Belarusian in Taraskievica orthography"), VALENCIA(
        null, null, "ca", "Valencian");

    private final String deprecated;
    private final String preferred;
    private final String[] prefixes;
    private final String[] descriptions;

    private Variant(String dep, String pref, String prefix, String... desc) {
        this(dep, pref, new String[] {prefix}, desc);
    }

    private Variant(String dep, String pref, String[] prefixes, String... desc) {
        this.deprecated = dep;
        this.preferred = pref;
        this.prefixes = prefixes;
        this.descriptions = desc;
    }

    public boolean isDeprecated() {
        return deprecated != null;
    }

    public String getDeprecated() {
        return deprecated;
    }

    public String getPreferredValue() {
        return preferred;
    }

    public Variant getPreferred() {
        return preferred != null ? valueOf(preferred.toUpperCase(Locale.US)) : this;
    }

    public String getPrefix() {
        return prefixes != null && prefixes.length > 0 ? prefixes[0] : null;
    }

    public String[] getPrefixes() {
        return prefixes;
    }

    public String getDescription() {
        return descriptions.length > 0 ? descriptions[0] : null;
    }

    public String[] getDescriptions() {
        return descriptions;
    }

    public Subtag newSubtag() {
        return new Subtag(this);
    }

    public static Variant valueOf(Subtag subtag) {
        if (subtag == null)
            return null;
        if (subtag.getType() == Subtag.Type.VARIANT) {
            String name = subtag.getName();
            if (name.startsWith("1"))
                name = "_" + name;
            return valueOf(name.toUpperCase(Locale.US));
        } else
            throw new IllegalArgumentException("Wrong subtag type");
    }

}