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extensions/net.sf.basedb.reggie/trunk/src/net/sf/basedb/reggie/converter/DateToYearConverter.java

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Rev	Date	Author	Line
4461	21 Apr 17	nicklas	1	package net.sf.basedb.reggie.converter;
4461	21 Apr 17	nicklas	2
4461	21 Apr 17	nicklas	3	import java.time.Instant;
4461	21 Apr 17	nicklas	4	import java.time.LocalDateTime;
4461	21 Apr 17	nicklas	5	import java.time.ZoneId;
4461	21 Apr 17	nicklas	6	import java.util.Date;
4461	21 Apr 17	nicklas	7
4461	21 Apr 17	nicklas	8	/**
4461	21 Apr 17	nicklas	9	Value converter implementation for converting dates to an integer year.
4461	21 Apr 17	nicklas	10
4461	21 Apr 17	nicklas	11	@author nicklas
4461	21 Apr 17	nicklas	12	@since 4.10
4461	21 Apr 17	nicklas	13	*/
4461	21 Apr 17	nicklas	14	public class DateToYearConverter
4461	21 Apr 17	nicklas	15	implements ValueConverter<Date, Integer>
4461	21 Apr 17	nicklas	16	{
4461	21 Apr 17	nicklas	17
4461	21 Apr 17	nicklas	18	/**
4461	21 Apr 17	nicklas	19	We will never need more than this instance.
4461	21 Apr 17	nicklas	20	*/
4461	21 Apr 17	nicklas	21	public static final DateToYearConverter INSTANCE = new DateToYearConverter();
4461	21 Apr 17	nicklas	22
4461	21 Apr 17	nicklas	23	/**
4461	21 Apr 17	nicklas	24	Use the singleton instance instead.
4461	21 Apr 17	nicklas	25	*/
4461	21 Apr 17	nicklas	26	private DateToYearConverter()
4461	21 Apr 17	nicklas	27	{}
4461	21 Apr 17	nicklas	28
4461	21 Apr 17	nicklas	29	/*
4461	21 Apr 17	nicklas	30	From the ValueConverter interface
4461	21 Apr 17	nicklas	31	---------------------------------
4461	21 Apr 17	nicklas	32	*/
4461	21 Apr 17	nicklas	33	@Override
4461	21 Apr 17	nicklas	34	public Integer convert(Date value)
4461	21 Apr 17	nicklas	35	{
4479	05 May 17	nicklas	36	if (value == null) return null;
4461	21 Apr 17	nicklas	37	// IMPORTANT! We must use Instant.ofEpochMilli() instead of Date.toInstant()
4461	21 Apr 17	nicklas	38	// since java.sql.Date.toInstant() throw UnsupporterOperationException
4461	21 Apr 17	nicklas	39	LocalDateTime dateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(value.getTime()), ZoneId.systemDefault());
4461	21 Apr 17	nicklas	40	return dateTime.getYear();
4461	21 Apr 17	nicklas	41	}
4461	21 Apr 17	nicklas	42	// ----------------------------------
4461	21 Apr 17	nicklas	43
4461	21 Apr 17	nicklas	44	}