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moved DateField format question so it shows up in javadocs 

git-svn-id: https://svn.apache.org/repos/asf/incubator/solr/trunk@398012 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Chris M. Hostetter 2006-04-28 21:12:31 +00:00
parent 1898a8adbe
commit 0359b97c80
1 changed files with 34 additions and 25 deletions
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59
src/java/org/apache/solr/schema/DateField.java
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@ -26,41 +26,50 @@ import org.apache.solr.search.function.OrdFieldSource;
import java.util.Map;
import java.io.IOException;
/***
Date Format for the XML, incoming and outgoing:
A date field shall be of the form 1995-12-31T23:59:59Z
The trailing "Z" designates UTC time and is mandatory.
Optional fractional seconds are allowed: 1995-12-31T23:59:59.999Z
All other parts are mandatory.
This format was derived to be standards compliant (ISO 8601) and is a more
restricted form of the canonical representation of dateTime from XML schema part 2.
http://www.w3.org/TR/xmlschema-2/#dateTime
"In 1970 the Coordinated Universal Time system was devised by an international
advisory group of technical experts within the International Telecommunication
Union (ITU). The ITU felt it was best to designate a single abbreviation for
use in all languages in order to minimize confusion. Since unanimous agreement
could not be achieved on using either the English word order, CUT, or the
French word order, TUC, the acronym UTC was chosen as a compromise."
***/
// The XML (external) date format will sort correctly, except if
// fractions of seconds are present (because '.' is lower than 'Z').
// The easiest fix is to simply remove the 'Z' for the internal
// format.
// TODO: make a FlexibleDateField that can accept dates in multiple
// formats, better for human entered dates.
// TODO: make a DayField that only stores the day?
/**
* FieldType that can represent any Date/Time with millisecond precisison.
* <p>
* Date Format for the XML, incoming and outgoing:
* </p>
* <blockquote>
* A date field shall be of the form 1995-12-31T23:59:59Z
* The trailing "Z" designates UTC time and is mandatory.
* Optional fractional seconds are allowed: 1995-12-31T23:59:59.999Z
* All other parts are mandatory.
* </blockquote>
* <p>
* This format was derived to be standards compliant (ISO 8601) and is a more
* restricted form of the canonical representation of dateTime from XML
* schema part 2.
* http://www.w3.org/TR/xmlschema-2/#dateTime
* </p>
* <blockquote>
* "In 1970 the Coordinated Universal Time system was devised by an
* international advisory group of technical experts within the International
* Telecommunication Union (ITU). The ITU felt it was best to designate a
* single abbreviation for use in all languages in order to minimize
* confusion. Since unanimous agreement could not be achieved on using
* either the English word order, CUT, or the French word order, TUC, the
* acronym UTC was chosen as a compromise."
* </blockquote>
*
* @author yonik
* @version $Id$
* @see <a href="http://www.w3.org/TR/xmlschema-2/#dateTime">XML schema part 2</a>
*/
public class DateField extends FieldType {
// The XML (external) date format will sort correctly, except if
// fractions of seconds are present (because '.' is lower than 'Z').
// The easiest fix is to simply remove the 'Z' for the internal
// format.
protected void init(IndexSchema schema, Map<String,String> args) {
}