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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 Singleton {
    A("Undefined", -1, null, null), B("Undefined", -1, null, null), C("Undefined", -1, null, null), D("Undefined", -1,
        null, null), E("Undefined", -1, null, null), F("Undefined", -1, null, null), G("Undefined", -1, null, null), H(
        "Undefined", -1, null, null), I("Undefined", -1, null, null), J("Undefined", -1, null, null), K("Undefined",
        -1, null, null), L("Undefined", -1, null, null), M("Undefined", -1, null, null), N("Undefined", -1, null, null), O(
        "Undefined", -1, null, null), P("Undefined", -1, null, null), Q("Undefined", -1, null, null), R("Undefined",
        -1, null, null), S("Undefined", -1, null, null), T("Undefined", -1, null, null), U("Undefined", -1, null, null), V(
        "Undefined", -1, null, null), W("Undefined", -1, null, null), X("Private Use", 4646, null, null), Y(
        "Undefined", -1, null, null), Z("Undefined", -1, null, null);

    private final String description;
    private final int rfc;
    private final String deprecated;
    private final String preferred;

    private Singleton(String description, int rfc, String deprecated, String preferred) {
        this.description = description;
        this.rfc = rfc;
        this.deprecated = deprecated;
        this.preferred = preferred;
    }

    public String getDescription() {
        return description;
    }

    public int getRFC() {
        return rfc;
    }

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

    public String getDeprecated() {
        return deprecated;
    }

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

    public String getPreferredValue() {
        return preferred;
    }

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

    public static Singleton valueOf(Subtag subtag) {
        if (subtag == null)
            return null;
        if (subtag.getType() == Subtag.Type.SINGLETON)
            return valueOf(subtag.getName().toUpperCase(Locale.US));
        else
            throw new IllegalArgumentException("Wrong subtag type");
    }
}