/*

 * Copyright (c) 2015, 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

 * or visit www.oracle.com if you need additional information or have any

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 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * The MIT License

 *

 * Copyright (c) 2004-2014 Paul R. Holser, Jr.

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

package jdk.internal.joptsimple.util;

import java.text.DateFormat;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.Date;

import jdk.internal.joptsimple.ValueConversionException;

import jdk.internal.joptsimple.ValueConverter;

/**

 * Converts values to {@link Date}s using a {@link DateFormat} object.

 *

 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>

 */

public class DateConverter implements ValueConverter<Date> {

    private final DateFormat formatter;

    /**

     * Creates a converter that uses the given date formatter/parser.

     *

     * @param formatter the formatter/parser to use

     * @throws NullPointerException if {@code formatter} is {@code null}

     */

    public DateConverter( DateFormat formatter ) {

        if ( formatter == null )

            throw new NullPointerException( "illegal null formatter" );

        this.formatter = formatter;

    }

    /**

     * Creates a converter that uses a {@link SimpleDateFormat} with the given date/time pattern.  The date formatter

     * created is not {@link SimpleDateFormat#setLenient(boolean) lenient}.

     *

     * @param pattern expected date/time pattern

     * @return the new converter

     * @throws NullPointerException if {@code pattern} is {@code null}

     * @throws IllegalArgumentException if {@code pattern} is invalid

     */

    public static DateConverter datePattern( String pattern ) {

        SimpleDateFormat formatter = new SimpleDateFormat( pattern );

        formatter.setLenient( false );

        return new DateConverter( formatter );

    }

    public Date convert( String value ) {

        ParsePosition position = new ParsePosition( 0 );

        Date date = formatter.parse( value, position );

        if ( position.getIndex() != value.length() )

            throw new ValueConversionException( message( value ) );

        return date;

    }

    public Class<Date> valueType() {

        return Date.class;

    }

    public String valuePattern() {

        return formatter instanceof SimpleDateFormat

            ? ( (SimpleDateFormat) formatter ).toPattern()

            : "";

    }

    private String message( String value ) {

        String message = "Value [" + value + "] does not match date/time pattern";

        if ( formatter instanceof SimpleDateFormat )

            message += " [" + ( (SimpleDateFormat) formatter ).toPattern() + ']';

        return message;

    }

}