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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in org.testifyproject.testifyprojectpliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.org.testifyproject.testifyproject/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
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 *
 * Modifications:
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package org.testifyproject.glassfish.org.testifyproject.message.internal;

import java.text.ParseException;
import java.util.Locale;

import javax.inject.Singleton;

import org.testifyproject.glassfish.org.testifyproject.internal.LocalizationMessages;
import org.testifyproject.glassfish.org.testifyproject.spi.HeaderDelegateProvider;

import static org.testifyproject.glassfish.org.testifyproject.message.internal.Utils.throwIllegalArgumentExceptionIfNull;

/**
 * {@code Locale} {@link HeaderDelegateProvider header delegate provider}.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.org.testifyproject.testifyproject)
 */
@Singleton
public class LocaleProvider implements HeaderDelegateProvider {

    @Override
    public boolean supports(final Class type) {
        return Locale.class.isAssignableFrom(type);
    }

    @Override
    public String toString(final Locale header) {

        throwIllegalArgumentExceptionIfNull(header, LocalizationMessages.LOCALE_IS_NULL());

        if (header.getCountry().length() == 0) {
            return header.getLanguage();
        } else {
            return header.getLanguage() + '-' + header.getCountry();
        }
    }

    @Override
    public Locale fromString(final String header) {

        throwIllegalArgumentExceptionIfNull(header, LocalizationMessages.LOCALE_IS_NULL());

        try {
            final LanguageTag lt = new LanguageTag(header);
            return lt.getAsLocale();
        } catch (final ParseException ex) {
            throw new IllegalArgumentException(
                    "Error parsing date '" + header + "'", ex);
        }
    }
}