// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package jodd.typeconverter.impl;

import jodd.datetime.JDateTime;
import jodd.typeconverter.TypeConversionException;
import jodd.typeconverter.TypeConverter;
import jodd.util.StringUtil;

import java.util.Calendar;
import java.util.Date;

/**
 * Converts given object to <code>java.util.Date</code>.
 * Conversion rules:
 * <ul>
 * <li><code>null</code> value is returned as <code>null</code></li>
 * <li>object of destination type is simply casted</li>
 * <li><code>Calendar</code> object is converted</li>
 * <li><code>JDateTime</code> object is converted</li>
 * <li><code>Number</code> is used as number of milliseconds</li>
 * <li>finally, if string value contains only numbers it is parsed as milliseconds;
 * otherwise as JDateTime pattern</li>
 * </ul>
 */
public class DateConverter implements TypeConverter<Date> {

	public Date convert(Object value) {
		if (value == null) {
			return null;
		}

		if (value instanceof Date) {
			return (Date) value;
		}
		if (value instanceof Calendar) {
			return new Date(((Calendar)value).getTimeInMillis());
		}
		if (value instanceof JDateTime) {
			return ((JDateTime) value).convertToDate();
		}
		if (value instanceof Number) {
			return new Date(((Number) value).longValue());
		}

		String stringValue = value.toString().trim();

		if (!StringUtil.containsOnlyDigits(stringValue)) {
			// try to parse default string format
			JDateTime jdt = new JDateTime(stringValue, JDateTime.DEFAULT_FORMAT);
			return jdt.convertToDate();
		}

		try {
			long milliseconds = Long.parseLong(stringValue);
			return new Date(milliseconds);
		} catch (NumberFormatException nfex) {
			throw new TypeConversionException(value, nfex);
		}
	}

}
