/*
 * 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;
    }
}