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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.time;
import org.elasticsearch.common.Strings;
import java.text.ParsePosition;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalField;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.function.Consumer;
class JavaDateFormatter implements DateFormatter {
// base fields which should be used for default parsing, when we round up for date math
private static final Map ROUND_UP_BASE_FIELDS = new HashMap<>(6);
{
ROUND_UP_BASE_FIELDS.put(ChronoField.MONTH_OF_YEAR, 1L);
ROUND_UP_BASE_FIELDS.put(ChronoField.DAY_OF_MONTH, 1L);
ROUND_UP_BASE_FIELDS.put(ChronoField.HOUR_OF_DAY, 23L);
ROUND_UP_BASE_FIELDS.put(ChronoField.MINUTE_OF_HOUR, 59L);
ROUND_UP_BASE_FIELDS.put(ChronoField.SECOND_OF_MINUTE, 59L);
ROUND_UP_BASE_FIELDS.put(ChronoField.NANO_OF_SECOND, 999_999_999L);
}
private final String format;
private final DateTimeFormatter printer;
private final List parsers;
private final DateTimeFormatter roundupParser;
JavaDateFormatter(String format, DateTimeFormatter printer, DateTimeFormatter... parsers) {
this(format, printer, builder -> ROUND_UP_BASE_FIELDS.forEach(builder::parseDefaulting), parsers);
}
JavaDateFormatter(String format, DateTimeFormatter printer, Consumer roundupParserConsumer,
DateTimeFormatter... parsers) {
if (printer == null) {
throw new IllegalArgumentException("printer may not be null");
}
long distinctZones = Arrays.stream(parsers).map(DateTimeFormatter::getZone).distinct().count();
if (distinctZones > 1) {
throw new IllegalArgumentException("formatters must have the same time zone");
}
long distinctLocales = Arrays.stream(parsers).map(DateTimeFormatter::getLocale).distinct().count();
if (distinctLocales > 1) {
throw new IllegalArgumentException("formatters must have the same locale");
}
this.printer = printer;
this.format = format;
if (parsers.length == 0) {
this.parsers = Collections.singletonList(printer);
} else {
this.parsers = Arrays.asList(parsers);
}
DateTimeFormatterBuilder builder = new DateTimeFormatterBuilder();
if (format.contains("||") == false) {
builder.append(this.parsers.get(0));
}
roundupParserConsumer.accept(builder);
DateTimeFormatter roundupFormatter = builder.toFormatter(locale());
if (printer.getZone() != null) {
roundupFormatter = roundupFormatter.withZone(zone());
}
this.roundupParser = roundupFormatter;
}
DateTimeFormatter getRoundupParser() {
return roundupParser;
}
DateTimeFormatter getPrinter() {
return printer;
}
@Override
public TemporalAccessor parse(String input) {
if (Strings.isNullOrEmpty(input)) {
throw new IllegalArgumentException("cannot parse empty date");
}
try {
return doParse(input);
} catch (DateTimeParseException e) {
throw new IllegalArgumentException("failed to parse date field [" + input + "] with format [" + format + "]", e);
}
}
/**
* Attempt parsing the input without throwing exception. If multiple parsers are provided,
* it will continue iterating if the previous parser failed. The pattern must fully match, meaning whole input was used.
* This also means that this method depends on DateTimeFormatter.ClassicFormat.parseObject
* which does not throw exceptions when parsing failed.
*
* The approach with collection of parsers was taken because java-time requires ordering on optional (composite)
* patterns. Joda does not suffer from this.
* https://bugs.openjdk.java.net/browse/JDK-8188771
*
* @param input An arbitrary string resembling the string representation of a date or time
* @return a TemporalAccessor if parsing was successful.
* @throws DateTimeParseException when unable to parse with any parsers
*/
private TemporalAccessor doParse(String input) {
if (parsers.size() > 1) {
for (DateTimeFormatter formatter : parsers) {
ParsePosition pos = new ParsePosition(0);
Object object = formatter.toFormat().parseObject(input, pos);
if (parsingSucceeded(object, input, pos) == true) {
return (TemporalAccessor) object;
}
}
throw new DateTimeParseException("Failed to parse with all enclosed parsers", input, 0);
}
return this.parsers.get(0).parse(input);
}
private boolean parsingSucceeded(Object object, String input, ParsePosition pos) {
return object != null && pos.getIndex() == input.length();
}
@Override
public DateFormatter withZone(ZoneId zoneId) {
// shortcurt to not create new objects unnecessarily
if (zoneId.equals(zone())) {
return this;
}
return new JavaDateFormatter(format, printer.withZone(zoneId),
parsers.stream().map(p -> p.withZone(zoneId)).toArray(size -> new DateTimeFormatter[size]));
}
@Override
public DateFormatter withLocale(Locale locale) {
// shortcurt to not create new objects unnecessarily
if (locale.equals(locale())) {
return this;
}
return new JavaDateFormatter(format, printer.withLocale(locale),
parsers.stream().map(p -> p.withLocale(locale)).toArray(size -> new DateTimeFormatter[size]));
}
@Override
public String format(TemporalAccessor accessor) {
return printer.format(DateFormatters.from(accessor));
}
@Override
public String pattern() {
return format;
}
@Override
public Locale locale() {
return this.printer.getLocale();
}
@Override
public ZoneId zone() {
return this.printer.getZone();
}
@Override
public DateMathParser toDateMathParser() {
return new JavaDateMathParser(format, this, getRoundupParser());
}
@Override
public int hashCode() {
return Objects.hash(locale(), printer.getZone(), format);
}
@Override
public boolean equals(Object obj) {
if (obj.getClass().equals(this.getClass()) == false) {
return false;
}
JavaDateFormatter other = (JavaDateFormatter) obj;
return Objects.equals(format, other.format) &&
Objects.equals(locale(), other.locale()) &&
Objects.equals(this.printer.getZone(), other.printer.getZone());
}
@Override
public String toString() {
return String.format(Locale.ROOT, "format[%s] locale[%s]", format, locale());
}
Collection getParsers() {
return parsers;
}
}