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Object Automation library
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/*  Copyright 1999 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.converter;

import java.sql.Date;
import java.sql.Time;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZonedDateTime;

import com.viaoa.util.OAConverter;
import com.viaoa.util.OADate;
import com.viaoa.util.OADateTime;

/**
 * Convert to/from a OADate value. 

 * Converting the following to an OADate
 * 
 * String, using optional format string.
 * 
Time
 * 
Date
 * 
OADateTime
 * 
All others value will return null.
 * 
 * 

 * Converting an OADate to any of the following
 * 
 * String, using an optional format.
 * 
 * See OADateTime for format definitions.
 *
 * @see OAConverter
 * @see OADateTime
 * @see OADate
 */
public class OAConverterOADate implements OAConverterInterface {

	/**
	 * Convert to/from a OADate value.
	 *
	 * @return Object of type clazz if conversion can be done, else null.
	 */
	public Object convert(Class clazz, Object value, String fmt) {
		if (clazz == null) {
			return null;
		}
		if (clazz.equals(OADate.class)) {
			return convertToOADate(value, fmt);
		}
		if (value != null && value instanceof OADate) {
			return convertFromOADate(clazz, (OADate) value, fmt);
		}
		return null;
	}

	protected OADate convertToOADate(Object value, String fmt) {
		if (value instanceof OADate) {
			return (OADate) value;
		}
		if (value == null) {
			return null;
		}
		OADate d = null;
		if (value instanceof String) {
			d = (OADate) OADate.valueOf((String) value, fmt);
		} else if (value instanceof Time) {
			d = new OADate((Time) value);
		} else if (value instanceof Date) {
			d = new OADate((Date) value);
		} else if (value instanceof OADateTime) {
			d = new OADate((OADateTime) value);
		} else if (value instanceof byte[]) {
			d = new OADate(new java.math.BigInteger((byte[]) value).longValue());
		} else if (value instanceof Number) {
			d = new OADate(((Number) value).longValue());
		}

		if (value instanceof Instant) {
			return new OADate(new OADateTime((Instant) value));
		}

		if (value instanceof LocalDate) {
			return new OADate((LocalDate) value);
		}

		// if (value instanceof LocalTime) {

		if (value instanceof LocalDateTime) {
			return new OADate(new OADateTime((LocalDateTime) value));
		}

		if (value instanceof ZonedDateTime) {
			return new OADate(new OADateTime((ZonedDateTime) value));
		}

		if (d != null) {
			if (d.getYear() > 9999) {
				d = null;
			} // Access will not allow dates where year is > 4 digits
		}

		return d;
	}

	protected Object convertFromOADate(Class toClass, OADate dateValue, String fmt) {
		if (toClass.equals(String.class)) {
			return (dateValue).toString(fmt);
		}
		//qqqqqqqq Date, long, etc.
		return null;
	}

}