/*

 * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package sun.util.locale.provider;

import java.lang.reflect.InvocationTargetException;

import java.text.DecimalFormat;

import java.util.ServiceConfigurationError;

import java.util.spi.LocaleServiceProvider;

/**

 * LocaleProviderAdapter implementation for the host locale data.

 * Currently it is only implemented on Windows Vista or later.

 *

 * @author Naoto Sato

 */

public class HostLocaleProviderAdapter extends AuxLocaleProviderAdapter {

    /**

     * Returns the type of this LocaleProviderAdapter

     */

    @Override

    public LocaleProviderAdapter.Type getAdapterType() {

        return LocaleProviderAdapter.Type.HOST;

    }

    @Override

    @SuppressWarnings("unchecked")

    protected <P extends LocaleServiceProvider> P findInstalledProvider(final Class<P> c) {

        try {

            return (P)Class.forName(

                        "sun.util.locale.provider.HostLocaleProviderAdapterImpl")

                    .getMethod("get" + c.getSimpleName(), (Class<?>[]) null)

                    .invoke(null, (Object[]) null);

        } catch (ClassNotFoundException |

                 NoSuchMethodException ex) {

            // permissible exceptions as platform may not support host adapter

            return null;

        } catch (IllegalAccessException |

                 IllegalArgumentException |

                 InvocationTargetException ex) {

            throw new ServiceConfigurationError(

                "Host locale provider cannot be located.", ex);

        }

    }

    /**

     * Utility to make the decimal format specific to integer, called

     * by the platform dependent adapter implementations.

     *

     * @param df A DecimalFormat object

     * @return The same DecimalFormat object in the argument, modified

     *          to allow integer formatting/parsing only.

     */

    static DecimalFormat makeIntegerFormatter(DecimalFormat df) {

        df.setMaximumFractionDigits(0);

        df.setDecimalSeparatorAlwaysShown(false);

        df.setParseIntegerOnly(true);

        return df;

    }

}