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Modern server-side Java template engine for both web and standalone environments
/*
* =============================================================================
*
* Copyright (c) 2011-2014, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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 org.thymeleaf.extras.java8time.util;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.time.Year;
import java.time.YearMonth;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.chrono.ChronoZonedDateTime;
import java.time.format.*;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.util.Locale;
import org.thymeleaf.util.Validate;
/**
* Utilities for the creation of Java 8 Time objects.
*
* @author José Miguel Samper
*
* @since 2.1.1
*/
public final class TemporalObjects {
public TemporalObjects() {
super();
}
public static DateTimeFormatter formatterFor(final Object target, final Locale locale) {
Validate.notNull(target, "Target cannot be null");
Validate.notNull(locale, "Locale cannot be null");
if (target instanceof LocalDate) {
return DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG).withLocale(locale);
} else if (target instanceof LocalDateTime) {
return DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG, FormatStyle.MEDIUM).withLocale(locale);
} else if (target instanceof ZonedDateTime) {
return DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG).withLocale(locale);
} else if (target instanceof Instant) {
return new DateTimeFormatterBuilder().appendInstant().toFormatter();
} else if (target instanceof LocalTime) {
return DateTimeFormatter.ofLocalizedTime(FormatStyle.MEDIUM).withLocale(locale);
} else if (target instanceof OffsetTime) {
return new DateTimeFormatterBuilder()
.appendValue(ChronoField.HOUR_OF_DAY)
.appendLiteral(':')
.appendValue(ChronoField.MINUTE_OF_HOUR)
.appendLiteral(':')
.appendValue(ChronoField.SECOND_OF_MINUTE)
.appendLocalizedOffset(TextStyle.FULL)
.toFormatter()
.withLocale(locale);
} else if (target instanceof OffsetDateTime) {
return new DateTimeFormatterBuilder()
.appendLocalized(FormatStyle.LONG, FormatStyle.MEDIUM)
.appendLocalizedOffset(TextStyle.FULL)
.toFormatter()
.withLocale(locale);
} else if (target instanceof Year) {
return new DateTimeFormatterBuilder()
.appendValue(ChronoField.YEAR)
.toFormatter();
} else if (target instanceof YearMonth) {
return yearMonthFormatter(locale);
} else {
throw new IllegalArgumentException(
"Cannot format object of class \"" + target.getClass().getName() + "\" as a date");
}
}
/**
* Creates a Temporal object filling the missing fields of the provided time with default values.
* @param target the temporal object to be converted
* @param defaultZoneId the default value for ZoneId
* @return a Temporal object
*/
public static ChronoZonedDateTime zonedTime(final Object target, final ZoneId defaultZoneId) {
Validate.notNull(target, "Target cannot be null");
Validate.notNull(defaultZoneId, "ZoneId cannot be null");
if (target instanceof ChronoZonedDateTime) {
return (ChronoZonedDateTime) target;
} else if (target instanceof LocalDateTime) {
return ZonedDateTime.of((LocalDateTime) target, defaultZoneId);
} else if (target instanceof LocalTime) {
return ZonedDateTime.of(LocalDate.now(), (LocalTime) target, defaultZoneId);
} else if (target instanceof LocalDate) {
return ZonedDateTime.of((LocalDate) target, LocalTime.MIDNIGHT, defaultZoneId);
} else if (target instanceof Instant) {
return ZonedDateTime.ofInstant((Instant) target, defaultZoneId);
} else {
throw new IllegalArgumentException(
"Cannot format object of class \"" + target.getClass().getName() + "\" as a date");
}
}
public static TemporalAccessor temporal(final Object target) {
Validate.notNull(target, "Target cannot be null");
if (target instanceof TemporalAccessor) {
return (TemporalAccessor) target;
} else {
throw new IllegalArgumentException(
"Cannot normalize class \"" + target.getClass().getName() + "\" as a date");
}
}
private static DateTimeFormatter yearMonthFormatter(final Locale locale) {
if (shouldDisplayYearBeforeMonth(locale)) {
return new DateTimeFormatterBuilder()
.appendValue(ChronoField.YEAR)
.appendLiteral(' ')
.appendText(ChronoField.MONTH_OF_YEAR)
.toFormatter()
.withLocale(locale);
} else {
return new DateTimeFormatterBuilder()
.appendText(ChronoField.MONTH_OF_YEAR)
.appendLiteral(' ')
.appendValue(ChronoField.YEAR)
.toFormatter()
.withLocale(locale);
}
}
private static boolean shouldDisplayYearBeforeMonth(final Locale locale) {
// We use "Month Year" or "Year Month" depending on the locale according to https://en.wikipedia.org/wiki/Date_format_by_country
String country = locale.getCountry();
switch (country) {
case "BT" :
case "CA" :
case "CN" :
case "KP" :
case "KR" :
case "TW" :
case "HU" :
case "IR" :
case "JP" :
case "LT" :
case "MN" :
return true;
default:
return false;
}
}
}