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com.ibm.icu.text.RelativeDateTimeFormatter Maven / Gradle / Ivy
International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2013-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.text;
import java.io.InvalidObjectException;
import java.text.AttributedCharacterIterator;
import java.text.Format;
import java.util.EnumMap;
import java.util.Locale;
import com.ibm.icu.impl.CacheBase;
import com.ibm.icu.impl.FormattedStringBuilder;
import com.ibm.icu.impl.FormattedValueStringBuilderImpl;
import com.ibm.icu.impl.ICUData;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.impl.SimpleFormatterImpl;
import com.ibm.icu.impl.SoftCache;
import com.ibm.icu.impl.StandardPlural;
import com.ibm.icu.impl.UResource;
import com.ibm.icu.impl.Utility;
import com.ibm.icu.impl.number.DecimalQuantity;
import com.ibm.icu.impl.number.DecimalQuantity_DualStorageBCD;
import com.ibm.icu.lang.UCharacter;
import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.ICUException;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* Formats simple relative dates. There are two types of relative dates that
* it handles:
*
* relative dates with a quantity e.g "in 5 days"
* relative dates without a quantity e.g "next Tuesday"
*
*
* This API is very basic and is intended to be a building block for more
* fancy APIs. The caller tells it exactly what to display in a locale
* independent way. While this class automatically provides the correct plural
* forms, the grammatical form is otherwise as neutral as possible. It is the
* caller's responsibility to handle cut-off logic such as deciding between
* displaying "in 7 days" or "in 1 week." This API supports relative dates
* involving one single unit. This API does not support relative dates
* involving compound units.
* e.g "in 5 days and 4 hours" nor does it support parsing.
* This class is both immutable and thread-safe.
*
* Here are some examples of use:
*
*
* RelativeDateTimeFormatter fmt = RelativeDateTimeFormatter.getInstance();
* fmt.format(1, Direction.NEXT, RelativeUnit.DAYS); // "in 1 day"
* fmt.format(3, Direction.NEXT, RelativeUnit.DAYS); // "in 3 days"
* fmt.format(3.2, Direction.LAST, RelativeUnit.YEARS); // "3.2 years ago"
*
* fmt.format(Direction.LAST, AbsoluteUnit.SUNDAY); // "last Sunday"
* fmt.format(Direction.THIS, AbsoluteUnit.SUNDAY); // "this Sunday"
* fmt.format(Direction.NEXT, AbsoluteUnit.SUNDAY); // "next Sunday"
* fmt.format(Direction.PLAIN, AbsoluteUnit.SUNDAY); // "Sunday"
*
* fmt.format(Direction.LAST, AbsoluteUnit.DAY); // "yesterday"
* fmt.format(Direction.THIS, AbsoluteUnit.DAY); // "today"
* fmt.format(Direction.NEXT, AbsoluteUnit.DAY); // "tomorrow"
*
* fmt.format(Direction.PLAIN, AbsoluteUnit.NOW); // "now"
*
*
*
* The Style parameter allows selection of different length styles:
* LONG ("3 seconds ago"), SHORT ("3 sec. ago"), NARROW ("3s ago").
* In the future, we may add more forms, such as relative day periods
* ("yesterday afternoon"), etc.
*
* @stable ICU 53
*/
public final class RelativeDateTimeFormatter {
/**
* The formatting style
* @stable ICU 54
*
*/
public static enum Style {
/**
* Everything spelled out.
* @stable ICU 54
*/
LONG,
/**
* Abbreviations used when possible.
* @stable ICU 54
*/
SHORT,
/**
* Use single letters when possible.
* @stable ICU 54
*/
NARROW;
private static final int INDEX_COUNT = 3; // NARROW.ordinal() + 1
}
/**
* Represents the unit for formatting a relative date. e.g "in 5 days"
* or "in 3 months"
* @stable ICU 53
*/
public static enum RelativeUnit {
/**
* Seconds
* @stable ICU 53
*/
SECONDS,
/**
* Minutes
* @stable ICU 53
*/
MINUTES,
/**
* Hours
* @stable ICU 53
*/
HOURS,
/**
* Days
* @stable ICU 53
*/
DAYS,
/**
* Weeks
* @stable ICU 53
*/
WEEKS,
/**
* Months
* @stable ICU 53
*/
MONTHS,
/**
* Years
* @stable ICU 53
*/
YEARS,
/**
* Quarters
* @draft ICU 76
*/
QUARTERS,
/**
* Sundays
* @draft ICU 76
*/
SUNDAYS,
/**
* Mondays
* @draft ICU 76
*/
MONDAYS,
/**
* Tuesdays
* @draft ICU 76
*/
TUESDAYS,
/**
* Wednesdays
* @draft ICU 76
*/
WEDNESDAYS,
/**
* Thursdays
* @draft ICU 76
*/
THURSDAYS,
/**
* Fridays
* @draft ICU 76
*/
FRIDAYS,
/**
* Saturdays
* @draft ICU 76
*/
SATURDAYS,
}
/**
* Represents an absolute unit.
* @stable ICU 53
*/
public static enum AbsoluteUnit {
/**
* Sunday
* @stable ICU 53
*/
SUNDAY,
/**
* Monday
* @stable ICU 53
*/
MONDAY,
/**
* Tuesday
* @stable ICU 53
*/
TUESDAY,
/**
* Wednesday
* @stable ICU 53
*/
WEDNESDAY,
/**
* Thursday
* @stable ICU 53
*/
THURSDAY,
/**
* Friday
* @stable ICU 53
*/
FRIDAY,
/**
* Saturday
* @stable ICU 53
*/
SATURDAY,
/**
* Day
* @stable ICU 53
*/
DAY,
/**
* Week
* @stable ICU 53
*/
WEEK,
/**
* Month
* @stable ICU 53
*/
MONTH,
/**
* Year
* @stable ICU 53
*/
YEAR,
/**
* Now
* @stable ICU 53
*/
NOW,
/**
* Quarter
* @stable ICU 64
*/
QUARTER,
/**
* Hour
* @stable ICU 65
*/
HOUR,
/**
* Minute
* @stable ICU 65
*/
MINUTE,
}
/**
* Represents a direction for an absolute unit e.g "Next Tuesday"
* or "Last Tuesday"
* @stable ICU 53
*/
public static enum Direction {
/**
* Two before. Not fully supported in every locale
* @stable ICU 53
*/
LAST_2,
/**
* Last
* @stable ICU 53
*/
LAST,
/**
* This
* @stable ICU 53
*/
THIS,
/**
* Next
* @stable ICU 53
*/
NEXT,
/**
* Two after. Not fully supported in every locale
* @stable ICU 53
*/
NEXT_2,
/**
* Plain, which means the absence of a qualifier
* @stable ICU 53
*/
PLAIN,
}
/**
* Represents the unit for formatting a relative date. e.g "in 5 days"
* or "next year"
* @stable ICU 57
*/
public static enum RelativeDateTimeUnit {
/**
* Specifies that relative unit is year, e.g. "last year",
* "in 5 years".
* @stable ICU 57
*/
YEAR,
/**
* Specifies that relative unit is quarter, e.g. "last quarter",
* "in 5 quarters".
* @stable ICU 57
*/
QUARTER,
/**
* Specifies that relative unit is month, e.g. "last month",
* "in 5 months".
* @stable ICU 57
*/
MONTH,
/**
* Specifies that relative unit is week, e.g. "last week",
* "in 5 weeks".
* @stable ICU 57
*/
WEEK,
/**
* Specifies that relative unit is day, e.g. "yesterday",
* "in 5 days".
* @stable ICU 57
*/
DAY,
/**
* Specifies that relative unit is hour, e.g. "1 hour ago",
* "in 5 hours".
* @stable ICU 57
*/
HOUR,
/**
* Specifies that relative unit is minute, e.g. "1 minute ago",
* "in 5 minutes".
* @stable ICU 57
*/
MINUTE,
/**
* Specifies that relative unit is second, e.g. "1 second ago",
* "in 5 seconds".
* @stable ICU 57
*/
SECOND,
/**
* Specifies that relative unit is Sunday, e.g. "last Sunday",
* "this Sunday", "next Sunday", "in 5 Sundays".
* @stable ICU 57
*/
SUNDAY,
/**
* Specifies that relative unit is Monday, e.g. "last Monday",
* "this Monday", "next Monday", "in 5 Mondays".
* @stable ICU 57
*/
MONDAY,
/**
* Specifies that relative unit is Tuesday, e.g. "last Tuesday",
* "this Tuesday", "next Tuesday", "in 5 Tuesdays".
* @stable ICU 57
*/
TUESDAY,
/**
* Specifies that relative unit is Wednesday, e.g. "last Wednesday",
* "this Wednesday", "next Wednesday", "in 5 Wednesdays".
* @stable ICU 57
*/
WEDNESDAY,
/**
* Specifies that relative unit is Thursday, e.g. "last Thursday",
* "this Thursday", "next Thursday", "in 5 Thursdays".
* @stable ICU 57
*/
THURSDAY,
/**
* Specifies that relative unit is Friday, e.g. "last Friday",
* "this Friday", "next Friday", "in 5 Fridays".
* @stable ICU 57
*/
FRIDAY,
/**
* Specifies that relative unit is Saturday, e.g. "last Saturday",
* "this Saturday", "next Saturday", "in 5 Saturdays".
* @stable ICU 57
*/
SATURDAY,
}
/**
* Field constants used when accessing field information for relative
* datetime strings in FormattedValue.
*
* There is no public constructor to this class; the only instances are the
* constants defined here.
*
* @stable ICU 64
*/
public static class Field extends Format.Field {
private static final long serialVersionUID = -5327685528663492325L;
/**
* Represents a literal text string, like "tomorrow" or "days ago".
*
* @stable ICU 64
*/
public static final Field LITERAL = new Field("literal");
/**
* Represents a number quantity, like "3" in "3 days ago".
*
* @stable ICU 64
*/
public static final Field NUMERIC = new Field("numeric");
private Field(String fieldName) {
super(fieldName);
}
/**
* Serizalization method resolve instances to the constant Field values
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
@Override
protected Object readResolve() throws InvalidObjectException {
if (this.getName().equals(LITERAL.getName()))
return LITERAL;
if (this.getName().equals(NUMERIC.getName()))
return NUMERIC;
throw new InvalidObjectException("An invalid object.");
}
}
/**
* Represents the result of a formatting operation of a relative datetime.
* Access the string value or field information.
*
* Instances of this class are immutable and thread-safe.
*
* Not intended for public subclassing.
*
* @author sffc
* @stable ICU 64
*/
public static class FormattedRelativeDateTime implements FormattedValue {
private final FormattedStringBuilder string;
private FormattedRelativeDateTime(FormattedStringBuilder string) {
this.string = string;
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public String toString() {
return string.toString();
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public int length() {
return string.length();
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public char charAt(int index) {
return string.charAt(index);
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public CharSequence subSequence(int start, int end) {
return string.subString(start, end);
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public A appendTo(A appendable) {
return Utility.appendTo(string, appendable);
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public boolean nextPosition(ConstrainedFieldPosition cfpos) {
return FormattedValueStringBuilderImpl.nextPosition(string, cfpos, Field.NUMERIC);
}
/**
* {@inheritDoc}
*
* @stable ICU 64
*/
@Override
public AttributedCharacterIterator toCharacterIterator() {
return FormattedValueStringBuilderImpl.toCharacterIterator(string, Field.NUMERIC);
}
}
/**
* Returns a RelativeDateTimeFormatter for the default locale.
* @stable ICU 53
*/
public static RelativeDateTimeFormatter getInstance() {
return getInstance(ULocale.getDefault(), null, Style.LONG, DisplayContext.CAPITALIZATION_NONE);
}
/**
* Returns a RelativeDateTimeFormatter for a particular locale.
*
* @param locale the locale.
* @return An instance of RelativeDateTimeFormatter.
* @stable ICU 53
*/
public static RelativeDateTimeFormatter getInstance(ULocale locale) {
return getInstance(locale, null, Style.LONG, DisplayContext.CAPITALIZATION_NONE);
}
/**
* Returns a RelativeDateTimeFormatter for a particular {@link java.util.Locale}.
*
* @param locale the {@link java.util.Locale}.
* @return An instance of RelativeDateTimeFormatter.
* @stable ICU 54
*/
public static RelativeDateTimeFormatter getInstance(Locale locale) {
return getInstance(ULocale.forLocale(locale));
}
/**
* Returns a RelativeDateTimeFormatter for a particular locale that uses a particular
* NumberFormat object.
*
* @param locale the locale
* @param nf the number format object. It is defensively copied to ensure thread-safety
* and immutability of this class.
* @return An instance of RelativeDateTimeFormatter.
* @stable ICU 53
*/
public static RelativeDateTimeFormatter getInstance(ULocale locale, NumberFormat nf) {
return getInstance(locale, nf, Style.LONG, DisplayContext.CAPITALIZATION_NONE);
}
/**
* Returns a RelativeDateTimeFormatter for a particular locale that uses a particular
* NumberFormat object, style, and capitalization context
*
* @param locale the locale
* @param nf the number format object. It is defensively copied to ensure thread-safety
* and immutability of this class. May be null.
* @param style the style.
* @param capitalizationContext the capitalization context.
* @stable ICU 54
*/
public static RelativeDateTimeFormatter getInstance(
ULocale locale,
NumberFormat nf,
Style style,
DisplayContext capitalizationContext) {
RelativeDateTimeFormatterData data = cache.get(locale);
if (nf == null) {
nf = NumberFormat.getInstance(locale);
} else {
nf = (NumberFormat) nf.clone();
}
return new RelativeDateTimeFormatter(
data.qualitativeUnitMap,
data.relUnitPatternMap,
SimpleFormatterImpl.compileToStringMinMaxArguments(
data.dateTimePattern, new StringBuilder(), 2, 2),
PluralRules.forLocale(locale),
nf,
style,
capitalizationContext,
capitalizationContext == DisplayContext.CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE ?
BreakIterator.getSentenceInstance(locale) : null,
locale);
}
/**
* Returns a RelativeDateTimeFormatter for a particular {@link java.util.Locale} that uses a
* particular NumberFormat object.
*
* @param locale the {@link java.util.Locale}
* @param nf the number format object. It is defensively copied to ensure thread-safety
* and immutability of this class.
* @return An instance of RelativeDateTimeFormatter.
* @stable ICU 54
*/
public static RelativeDateTimeFormatter getInstance(Locale locale, NumberFormat nf) {
return getInstance(ULocale.forLocale(locale), nf);
}
/**
* Formats a relative date with a quantity such as "in 5 days" or
* "3 months ago".
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param quantity The numerical amount e.g 5. This value is formatted
* according to this object's {@link NumberFormat} object.
* @param direction NEXT means a future relative date; LAST means a past
* relative date.
* @param unit the unit e.g day? month? year?
* @return the formatted string
* @throws IllegalArgumentException if direction is something other than
* NEXT or LAST.
* @stable ICU 53
*/
public String format(double quantity, Direction direction, RelativeUnit unit) {
FormattedStringBuilder output = formatImpl(quantity, direction, unit);
return adjustForContext(output.toString());
}
/**
* Formats a relative date with a quantity such as "in 5 days" or
* "3 months ago".
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* @param quantity The numerical amount e.g 5. This value is formatted
* according to this object's {@link NumberFormat} object.
* @param direction NEXT means a future relative date; LAST means a past
* relative date.
* @param unit the unit e.g day? month? year?
* @return the formatted relative datetime
* @throws IllegalArgumentException if direction is something other than
* NEXT or LAST.
* @stable ICU 64
*/
public FormattedRelativeDateTime formatToValue(double quantity, Direction direction, RelativeUnit unit) {
checkNoAdjustForContext();
return new FormattedRelativeDateTime(formatImpl(quantity, direction, unit));
}
/** Implementation method for format and formatToValue with RelativeUnit */
private FormattedStringBuilder formatImpl(double quantity, Direction direction, RelativeUnit unit) {
if (direction != Direction.LAST && direction != Direction.NEXT) {
throw new IllegalArgumentException("direction must be NEXT or LAST");
}
int pastFutureIndex = (direction == Direction.NEXT ? 1 : 0);
FormattedStringBuilder output = new FormattedStringBuilder();
String pluralKeyword;
if (numberFormat instanceof DecimalFormat) {
DecimalQuantity dq = new DecimalQuantity_DualStorageBCD(quantity);
((DecimalFormat) numberFormat).toNumberFormatter().formatImpl(dq, output);
pluralKeyword = pluralRules.select(dq);
} else {
String result = numberFormat.format(quantity);
output.append(result, null);
pluralKeyword = pluralRules.select(quantity);
}
StandardPlural pluralForm = StandardPlural.orOtherFromString(pluralKeyword);
String compiledPattern = getRelativeUnitPluralPattern(style, unit, pastFutureIndex, pluralForm);
SimpleFormatterImpl.formatPrefixSuffix(compiledPattern, Field.LITERAL, 0, output.length(), output);
return output;
}
/**
* Format a combination of RelativeDateTimeUnit and numeric offset
* using a numeric style, e.g. "1 week ago", "in 1 week",
* "5 weeks ago", "in 5 weeks".
*
* This method returns a String. To get more information about the
* formatting result, use formatNumericToValue().
*
* @param offset The signed offset for the specified unit. This
* will be formatted according to this object's
* NumberFormat object.
* @param unit The unit to use when formatting the relative
* date, e.g. RelativeDateTimeUnit.WEEK,
* RelativeDateTimeUnit.FRIDAY.
* @return The formatted string (may be empty in case of error)
* @stable ICU 57
*/
public String formatNumeric(double offset, RelativeDateTimeUnit unit) {
FormattedStringBuilder output = formatNumericImpl(offset, unit);
return adjustForContext(output.toString());
}
/**
* Format a combination of RelativeDateTimeUnit and numeric offset
* using a numeric style, e.g. "1 week ago", "in 1 week",
* "5 weeks ago", "in 5 weeks".
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by formatNumeric().
*
* @param offset The signed offset for the specified unit. This
* will be formatted according to this object's
* NumberFormat object.
* @param unit The unit to use when formatting the relative
* date, e.g. RelativeDateTimeUnit.WEEK,
* RelativeDateTimeUnit.FRIDAY.
* @return The formatted string (may be empty in case of error)
* @stable ICU 64
*/
public FormattedRelativeDateTime formatNumericToValue(double offset, RelativeDateTimeUnit unit) {
checkNoAdjustForContext();
return new FormattedRelativeDateTime(formatNumericImpl(offset, unit));
}
/** Implementation method for formatNumeric and formatNumericToValue */
private FormattedStringBuilder formatNumericImpl(double offset, RelativeDateTimeUnit unit) {
// TODO:
// The full implementation of this depends on CLDR data that is not yet available,
// see: http://unicode.org/cldr/trac/ticket/9165 Add more relative field data.
// In the meantime do a quick bring-up by calling the old format method. When the
// new CLDR data is available, update the data storage accordingly, rewrite this
// to use it directly, and rewrite the old format method to call this new one;
// that is covered by https://unicode-org.atlassian.net/browse/ICU-12171.
RelativeUnit relunit = RelativeUnit.SECONDS;
switch (unit) {
case YEAR: relunit = RelativeUnit.YEARS; break;
case QUARTER: relunit = RelativeUnit.QUARTERS; break;
case MONTH: relunit = RelativeUnit.MONTHS; break;
case WEEK: relunit = RelativeUnit.WEEKS; break;
case DAY: relunit = RelativeUnit.DAYS; break;
case HOUR: relunit = RelativeUnit.HOURS; break;
case MINUTE: relunit = RelativeUnit.MINUTES; break;
case SECOND: break; // set above
case SUNDAY: relunit = RelativeUnit.SUNDAYS; break;
case MONDAY: relunit = RelativeUnit.MONDAYS; break;
case TUESDAY: relunit = RelativeUnit.TUESDAYS; break;
case WEDNESDAY: relunit = RelativeUnit.WEDNESDAYS; break;
case THURSDAY: relunit = RelativeUnit.THURSDAYS; break;
case FRIDAY: relunit = RelativeUnit.FRIDAYS; break;
case SATURDAY: relunit = RelativeUnit.SATURDAYS; break;
}
Direction direction = Direction.NEXT;
if (Double.compare(offset,0.0) < 0) { // needed to handle -0.0
direction = Direction.LAST;
offset = -offset;
}
return formatImpl(offset, direction, relunit);
}
private int[] styleToDateFormatSymbolsWidth = {
DateFormatSymbols.WIDE, DateFormatSymbols.SHORT, DateFormatSymbols.NARROW
};
/**
* Formats a relative date without a quantity.
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param direction NEXT, LAST, THIS, etc.
* @param unit e.g SATURDAY, DAY, MONTH
* @return the formatted string. If direction has a value that is documented as not being
* fully supported in every locale (for example NEXT_2 or LAST_2) then this function may
* return null to signal that no formatted string is available.
* @throws IllegalArgumentException if the direction is incompatible with
* unit this can occur with NOW which can only take PLAIN.
* @stable ICU 53
*/
public String format(Direction direction, AbsoluteUnit unit) {
String result = formatAbsoluteImpl(direction, unit);
return result != null ? adjustForContext(result) : null;
}
/**
* Formats a relative date without a quantity.
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* @param direction NEXT, LAST, THIS, etc.
* @param unit e.g SATURDAY, DAY, MONTH
* @return the formatted string. If direction has a value that is documented as not being
* fully supported in every locale (for example NEXT_2 or LAST_2) then this function may
* return null to signal that no formatted string is available.
* @throws IllegalArgumentException if the direction is incompatible with
* unit this can occur with NOW which can only take PLAIN.
* @stable ICU 64
*/
public FormattedRelativeDateTime formatToValue(Direction direction, AbsoluteUnit unit) {
checkNoAdjustForContext();
String string = formatAbsoluteImpl(direction, unit);
if (string == null) {
return null;
}
FormattedStringBuilder nsb = new FormattedStringBuilder();
nsb.append(string, Field.LITERAL);
return new FormattedRelativeDateTime(nsb);
}
/** Implementation method for format and formatToValue with AbsoluteUnit */
private String formatAbsoluteImpl(Direction direction, AbsoluteUnit unit) {
if (unit == AbsoluteUnit.NOW && direction != Direction.PLAIN) {
throw new IllegalArgumentException("NOW can only accept direction PLAIN.");
}
String result;
// Get plain day of week names from DateFormatSymbols.
if ((direction == Direction.PLAIN) && (AbsoluteUnit.SUNDAY.ordinal() <= unit.ordinal() &&
unit.ordinal() <= AbsoluteUnit.SATURDAY.ordinal())) {
// Convert from AbsoluteUnit days to Calendar class indexing.
int dateSymbolsDayOrdinal = (unit.ordinal() - AbsoluteUnit.SUNDAY.ordinal()) + Calendar.SUNDAY;
String[] dayNames =
dateFormatSymbols.getWeekdays(DateFormatSymbols.STANDALONE,
styleToDateFormatSymbolsWidth[style.ordinal()]);
result = dayNames[dateSymbolsDayOrdinal];
} else {
// Not PLAIN, or not a weekday.
result = getAbsoluteUnitString(style, unit, direction);
}
return result;
}
/**
* Format a combination of RelativeDateTimeUnit and numeric offset
* using a text style if possible, e.g. "last week", "this week",
* "next week", "yesterday", "tomorrow". Falls back to numeric
* style if no appropriate text term is available for the specified
* offset in the object’s locale.
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param offset The signed offset for the specified field.
* @param unit The unit to use when formatting the relative
* date, e.g. RelativeDateTimeUnit.WEEK,
* RelativeDateTimeUnit.FRIDAY.
* @return The formatted string (may be empty in case of error)
* @stable ICU 57
*/
public String format(double offset, RelativeDateTimeUnit unit) {
return adjustForContext(formatRelativeImpl(offset, unit).toString());
}
/**
* Format a combination of RelativeDateTimeUnit and numeric offset
* using a text style if possible, e.g. "last week", "this week",
* "next week", "yesterday", "tomorrow". Falls back to numeric
* style if no appropriate text term is available for the specified
* offset in the object’s locale.
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* @param offset The signed offset for the specified field.
* @param unit The unit to use when formatting the relative
* date, e.g. RelativeDateTimeUnit.WEEK,
* RelativeDateTimeUnit.FRIDAY.
* @return The formatted string (may be empty in case of error)
* @stable ICU 64
*/
public FormattedRelativeDateTime formatToValue(double offset, RelativeDateTimeUnit unit) {
checkNoAdjustForContext();
CharSequence cs = formatRelativeImpl(offset, unit);
FormattedStringBuilder nsb;
if (cs instanceof FormattedStringBuilder) {
nsb = (FormattedStringBuilder) cs;
} else {
nsb = new FormattedStringBuilder();
nsb.append(cs, Field.LITERAL);
}
return new FormattedRelativeDateTime(nsb);
}
/** Implementation method for format and formatToValue with RelativeDateTimeUnit. */
private CharSequence formatRelativeImpl(double offset, RelativeDateTimeUnit unit) {
// TODO:
// The full implementation of this depends on CLDR data that is not yet available,
// see: http://unicode.org/cldr/trac/ticket/9165 Add more relative field data.
// In the meantime do a quick bring-up by calling the old format method. When the
// new CLDR data is available, update the data storage accordingly, rewrite this
// to use it directly, and rewrite the old format method to call this new one;
// that is covered by https://unicode-org.atlassian.net/browse/ICU-12171.
boolean useNumeric = true;
Direction direction = Direction.THIS;
if (offset > -2.1 && offset < 2.1) {
// Allow a 1% epsilon, so offsets in -1.01..-0.99 map to LAST
double offsetx100 = offset * 100.0;
int intoffsetx100 = (offsetx100 < 0)? (int)(offsetx100-0.5) : (int)(offsetx100+0.5);
switch (intoffsetx100) {
case -200/*-2*/: direction = Direction.LAST_2; useNumeric = false; break;
case -100/*-1*/: direction = Direction.LAST; useNumeric = false; break;
case 0/* 0*/: useNumeric = false; break; // direction = Direction.THIS was set above
case 100/* 1*/: direction = Direction.NEXT; useNumeric = false; break;
case 200/* 2*/: direction = Direction.NEXT_2; useNumeric = false; break;
default: break;
}
}
AbsoluteUnit absunit = AbsoluteUnit.NOW;
switch (unit) {
case YEAR: absunit = AbsoluteUnit.YEAR; break;
case QUARTER: absunit = AbsoluteUnit.QUARTER; break;
case MONTH: absunit = AbsoluteUnit.MONTH; break;
case WEEK: absunit = AbsoluteUnit.WEEK; break;
case DAY: absunit = AbsoluteUnit.DAY; break;
case SUNDAY: absunit = AbsoluteUnit.SUNDAY; break;
case MONDAY: absunit = AbsoluteUnit.MONDAY; break;
case TUESDAY: absunit = AbsoluteUnit.TUESDAY; break;
case WEDNESDAY: absunit = AbsoluteUnit.WEDNESDAY; break;
case THURSDAY: absunit = AbsoluteUnit.THURSDAY; break;
case FRIDAY: absunit = AbsoluteUnit.FRIDAY; break;
case SATURDAY: absunit = AbsoluteUnit.SATURDAY; break;
case HOUR: absunit = AbsoluteUnit.HOUR; break;
case MINUTE: absunit = AbsoluteUnit.MINUTE; break;
case SECOND:
if (direction == Direction.THIS) {
// absunit = AbsoluteUnit.NOW was set above
direction = Direction.PLAIN;
break;
}
// could just fall through here but that produces warnings
useNumeric = true;
break;
default:
useNumeric = true;
break;
}
if (!useNumeric) {
String result = formatAbsoluteImpl(direction, absunit);
if (result != null && result.length() > 0) {
return result;
}
}
// otherwise fallback to formatNumeric
return formatNumericImpl(offset, unit);
}
/**
* Gets the string value from qualitativeUnitMap with fallback based on style.
*/
private String getAbsoluteUnitString(Style style, AbsoluteUnit unit, Direction direction) {
EnumMap> unitMap;
EnumMap dirMap;
do {
unitMap = qualitativeUnitMap.get(style);
if (unitMap != null) {
dirMap = unitMap.get(unit);
if (dirMap != null) {
String result = dirMap.get(direction);
if (result != null) {
return result;
}
}
}
// Consider other styles from alias fallback.
// Data loading guaranteed no endless loops.
} while ((style = fallbackCache[style.ordinal()]) != null);
return null;
}
/**
* Combines a relative date string and a time string in this object's
* locale. This is done with the same date-time separator used for the
* default calendar in this locale.
* @param relativeDateString the relative date e.g 'yesterday'
* @param timeString the time e.g '3:45'
* @return the date and time concatenated according to the default
* calendar in this locale e.g 'yesterday, 3:45'
* @stable ICU 53
*/
public String combineDateAndTime(String relativeDateString, String timeString) {
return SimpleFormatterImpl.formatCompiledPattern(
combinedDateAndTime, timeString, relativeDateString);
}
/**
* Returns a copy of the NumberFormat this object is using.
* @return A copy of the NumberFormat.
* @stable ICU 53
*/
public NumberFormat getNumberFormat() {
// This class is thread-safe, yet numberFormat is not. To ensure thread-safety of this
// class we must guarantee that only one thread at a time uses our numberFormat.
synchronized (numberFormat) {
return (NumberFormat) numberFormat.clone();
}
}
/**
* Return capitalization context.
* @return The capitalization context.
* @stable ICU 54
*/
public DisplayContext getCapitalizationContext() {
return capitalizationContext;
}
/**
* Return style
* @return The formatting style.
* @stable ICU 54
*/
public Style getFormatStyle() {
return style;
}
private String adjustForContext(String originalFormattedString) {
if (breakIterator == null || originalFormattedString.length() == 0
|| !UCharacter.isLowerCase(UCharacter.codePointAt(originalFormattedString, 0))) {
return originalFormattedString;
}
synchronized (breakIterator) {
return UCharacter.toTitleCase(
locale,
originalFormattedString,
breakIterator,
UCharacter.TITLECASE_NO_LOWERCASE | UCharacter.TITLECASE_NO_BREAK_ADJUSTMENT);
}
}
private void checkNoAdjustForContext() {
if (breakIterator != null) {
throw new UnsupportedOperationException("Capitalization context is not supported in formatV");
}
}
private RelativeDateTimeFormatter(
EnumMap>> qualitativeUnitMap,
EnumMap> patternMap,
String combinedDateAndTime,
PluralRules pluralRules,
NumberFormat numberFormat,
Style style,
DisplayContext capitalizationContext,
BreakIterator breakIterator,
ULocale locale) {
this.qualitativeUnitMap = qualitativeUnitMap;
this.patternMap = patternMap;
this.combinedDateAndTime = combinedDateAndTime;
this.pluralRules = pluralRules;
this.numberFormat = numberFormat;
this.style = style;
if (capitalizationContext.type() != DisplayContext.Type.CAPITALIZATION) {
throw new IllegalArgumentException(capitalizationContext.toString());
}
this.capitalizationContext = capitalizationContext;
this.breakIterator = breakIterator;
this.locale = locale;
this.dateFormatSymbols = new DateFormatSymbols(locale);
}
private String getRelativeUnitPluralPattern(
Style style, RelativeUnit unit, int pastFutureIndex, StandardPlural pluralForm) {
if (pluralForm != StandardPlural.OTHER) {
String formatter = getRelativeUnitPattern(style, unit, pastFutureIndex, pluralForm);
if (formatter != null) {
return formatter;
}
}
return getRelativeUnitPattern(style, unit, pastFutureIndex, StandardPlural.OTHER);
}
private String getRelativeUnitPattern(
Style style, RelativeUnit unit, int pastFutureIndex, StandardPlural pluralForm) {
int pluralIndex = pluralForm.ordinal();
do {
EnumMap unitMap = patternMap.get(style);
if (unitMap != null) {
String[][] spfCompiledPatterns = unitMap.get(unit);
if (spfCompiledPatterns != null) {
if (spfCompiledPatterns[pastFutureIndex][pluralIndex] != null) {
return spfCompiledPatterns[pastFutureIndex][pluralIndex];
}
}
}
// Consider other styles from alias fallback.
// Data loading guaranteed no endless loops.
} while ((style = fallbackCache[style.ordinal()]) != null);
return null;
}
private final EnumMap>> qualitativeUnitMap;
private final EnumMap> patternMap;
private final String combinedDateAndTime; // compiled SimpleFormatter pattern
private final PluralRules pluralRules;
private final NumberFormat numberFormat;
private final Style style;
private final DisplayContext capitalizationContext;
private final BreakIterator breakIterator;
private final ULocale locale;
private final DateFormatSymbols dateFormatSymbols;
private static final Style fallbackCache[] = new Style[Style.INDEX_COUNT];
private static class RelativeDateTimeFormatterData {
public RelativeDateTimeFormatterData(
EnumMap>> qualitativeUnitMap,
EnumMap> relUnitPatternMap,
String dateTimePattern) {
this.qualitativeUnitMap = qualitativeUnitMap;
this.relUnitPatternMap = relUnitPatternMap;
this.dateTimePattern = dateTimePattern;
}
public final EnumMap>> qualitativeUnitMap;
EnumMap> relUnitPatternMap;
public final String dateTimePattern; // Example: "{1}, {0}"
}
private static class Cache {
private final CacheBase cache =
new SoftCache() {
@Override
protected RelativeDateTimeFormatterData createInstance(String key, ULocale locale) {
return new Loader(locale).load();
}
};
public RelativeDateTimeFormatterData get(ULocale locale) {
String key = locale.toString();
return cache.getInstance(key, locale);
}
}
private static Direction keyToDirection(UResource.Key key) {
if (key.contentEquals("-2")) {
return Direction.LAST_2;
}
if (key.contentEquals("-1")) {
return Direction.LAST;
}
if (key.contentEquals("0")) {
return Direction.THIS;
}
if (key.contentEquals("1")) {
return Direction.NEXT;
}
if (key.contentEquals("2")) {
return Direction.NEXT_2;
}
return null;
}
/**
* Sink for enumerating all of the relative data time formatter names.
*
* More specific bundles (en_GB) are enumerated before their parents (en_001, en, root):
* Only store a value if it is still missing, that is, it has not been overridden.
*/
private static final class RelDateTimeDataSink extends UResource.Sink {
// For white list of units to handle in RelativeDateTimeFormatter.
private enum DateTimeUnit {
SECOND(RelativeUnit.SECONDS, null),
MINUTE(RelativeUnit.MINUTES, AbsoluteUnit.MINUTE),
HOUR(RelativeUnit.HOURS, AbsoluteUnit.HOUR),
DAY(RelativeUnit.DAYS, AbsoluteUnit.DAY),
WEEK(RelativeUnit.WEEKS, AbsoluteUnit.WEEK),
MONTH(RelativeUnit.MONTHS, AbsoluteUnit.MONTH),
QUARTER(RelativeUnit.QUARTERS, AbsoluteUnit.QUARTER),
YEAR(RelativeUnit.YEARS, AbsoluteUnit.YEAR),
SUNDAY(RelativeUnit.SUNDAYS, AbsoluteUnit.SUNDAY),
MONDAY(RelativeUnit.MONDAYS, AbsoluteUnit.MONDAY),
TUESDAY(RelativeUnit.TUESDAYS, AbsoluteUnit.TUESDAY),
WEDNESDAY(RelativeUnit.WEDNESDAYS, AbsoluteUnit.WEDNESDAY),
THURSDAY(RelativeUnit.THURSDAYS, AbsoluteUnit.THURSDAY),
FRIDAY(RelativeUnit.FRIDAYS, AbsoluteUnit.FRIDAY),
SATURDAY(RelativeUnit.SATURDAYS, AbsoluteUnit.SATURDAY);
RelativeUnit relUnit;
AbsoluteUnit absUnit;
DateTimeUnit(RelativeUnit relUnit, AbsoluteUnit absUnit) {
this.relUnit = relUnit;
this.absUnit = absUnit;
}
private static final DateTimeUnit orNullFromString(CharSequence keyword) {
// Quick check from string to enum.
switch (keyword.length()) {
case 3:
if ("day".contentEquals(keyword)) {
return DAY;
} else if ("sun".contentEquals(keyword)) {
return SUNDAY;
} else if ("mon".contentEquals(keyword)) {
return MONDAY;
} else if ("tue".contentEquals(keyword)) {
return TUESDAY;
} else if ("wed".contentEquals(keyword)) {
return WEDNESDAY;
} else if ("thu".contentEquals(keyword)) {
return THURSDAY;
} else if ("fri".contentEquals(keyword)) {
return FRIDAY;
} else if ("sat".contentEquals(keyword)) {
return SATURDAY;
}
break;
case 4:
if ("hour".contentEquals(keyword)) {
return HOUR;
} else if ("week".contentEquals(keyword)) {
return WEEK;
} else if ("year".contentEquals(keyword)) {
return YEAR;
}
break;
case 5:
if ("month".contentEquals(keyword)) {
return MONTH;
}
break;
case 6:
if ("minute".contentEquals(keyword)) {
return MINUTE;
}else if ("second".contentEquals(keyword)) {
return SECOND;
}
break;
case 7:
if ("quarter".contentEquals(keyword)) {
return QUARTER; // RelativeUnit.QUARTERS is deprecated
}
break;
default:
break;
}
return null;
}
}
EnumMap>> qualitativeUnitMap =
new EnumMap<>(Style.class);
EnumMap> styleRelUnitPatterns =
new EnumMap<>(Style.class);
StringBuilder sb = new StringBuilder();
// Values keep between levels of parsing the CLDR data.
int pastFutureIndex;
Style style; // {LONG, SHORT, NARROW} Derived from unit key string.
DateTimeUnit unit; // From the unit key string, with the style (e.g., "-short") separated out.
private Style styleFromKey(UResource.Key key) {
if (key.endsWith("-short")) {
return Style.SHORT;
} else if (key.endsWith("-narrow")) {
return Style.NARROW;
} else {
return Style.LONG;
}
}
private Style styleFromAlias(UResource.Value value) {
String s = value.getAliasString();
if (s.endsWith("-short")) {
return Style.SHORT;
} else if (s.endsWith("-narrow")) {
return Style.NARROW;
} else {
return Style.LONG;
}
}
private static int styleSuffixLength(Style style) {
switch (style) {
case SHORT: return 6;
case NARROW: return 7;
default: return 0;
}
}
public void consumeTableRelative(UResource.Key key, UResource.Value value) {
UResource.Table unitTypesTable = value.getTable();
for (int i = 0; unitTypesTable.getKeyAndValue(i, key, value); i++) {
if (value.getType() == ICUResourceBundle.STRING) {
String valueString = value.getString();
EnumMap> absMap = qualitativeUnitMap.get(style);
if (unit.relUnit == RelativeUnit.SECONDS) {
if (key.contentEquals("0")) {
// Handle Zero seconds for "now".
EnumMap unitStrings = absMap.get(AbsoluteUnit.NOW);
if (unitStrings == null) {
unitStrings = new EnumMap<>(Direction.class);
absMap.put(AbsoluteUnit.NOW, unitStrings);
}
if (unitStrings.get(Direction.PLAIN) == null) {
unitStrings.put(Direction.PLAIN, valueString);
}
continue;
}
}
Direction keyDirection = keyToDirection(key);
if (keyDirection == null) {
continue;
}
AbsoluteUnit absUnit = unit.absUnit;
if (absUnit == null) {
continue;
}
if (absMap == null) {
absMap = new EnumMap<>(AbsoluteUnit.class);
qualitativeUnitMap.put(style, absMap);
}
EnumMap dirMap = absMap.get(absUnit);
if (dirMap == null) {
dirMap = new EnumMap<>(Direction.class);
absMap.put(absUnit, dirMap);
}
if (dirMap.get(keyDirection) == null) {
// Do not override values already entered.
dirMap.put(keyDirection, value.getString());
}
}
}
}
// Record past or future and
public void consumeTableRelativeTime(UResource.Key key, UResource.Value value) {
if (unit.relUnit == null) {
return;
}
UResource.Table unitTypesTable = value.getTable();
for (int i = 0; unitTypesTable.getKeyAndValue(i, key, value); i++) {
if (key.contentEquals("past")) {
pastFutureIndex = 0;
} else if (key.contentEquals("future")) {
pastFutureIndex = 1;
} else {
continue;
}
// Get the details of the relative time.
consumeTimeDetail(key, value);
}
}
public void consumeTimeDetail(UResource.Key key, UResource.Value value) {
UResource.Table unitTypesTable = value.getTable();
EnumMap unitPatterns = styleRelUnitPatterns.get(style);
if (unitPatterns == null) {
unitPatterns = new EnumMap<>(RelativeUnit.class);
styleRelUnitPatterns.put(style, unitPatterns);
}
String[][] patterns = unitPatterns.get(unit.relUnit);
if (patterns == null) {
patterns = new String[2][StandardPlural.COUNT];
unitPatterns.put(unit.relUnit, patterns);
}
// Stuff the pattern for the correct plural index with a simple formatter.
for (int i = 0; unitTypesTable.getKeyAndValue(i, key, value); i++) {
if (value.getType() == ICUResourceBundle.STRING) {
int pluralIndex = StandardPlural.indexFromString(key.toString());
if (patterns[pastFutureIndex][pluralIndex] == null) {
patterns[pastFutureIndex][pluralIndex] =
SimpleFormatterImpl.compileToStringMinMaxArguments(
value.getString(), sb, 0, 1);
}
}
}
}
private void handlePlainDirection(UResource.Key key, UResource.Value value) {
AbsoluteUnit absUnit = unit.absUnit;
if (absUnit == null) {
return; // Not interesting.
}
EnumMap> unitMap =
qualitativeUnitMap.get(style);
if (unitMap == null) {
unitMap = new EnumMap<>(AbsoluteUnit.class);
qualitativeUnitMap.put(style, unitMap);
}
EnumMap dirMap = unitMap.get(absUnit);
if (dirMap == null) {
dirMap = new EnumMap<>(Direction.class);
unitMap.put(absUnit, dirMap);
}
if (dirMap.get(Direction.PLAIN) == null) {
dirMap.put(Direction.PLAIN, value.toString());
}
}
// Handle at the Unit level,
public void consumeTimeUnit(UResource.Key key, UResource.Value value) {
UResource.Table unitTypesTable = value.getTable();
for (int i = 0; unitTypesTable.getKeyAndValue(i, key, value); i++) {
if (key.contentEquals("dn") && value.getType() == ICUResourceBundle.STRING) {
handlePlainDirection(key, value);
}
if (value.getType() == ICUResourceBundle.TABLE) {
if (key.contentEquals("relative")) {
consumeTableRelative(key, value);
} else if (key.contentEquals("relativeTime")) {
consumeTableRelativeTime(key, value);
}
}
}
}
private void handleAlias(UResource.Key key, UResource.Value value, boolean noFallback) {
Style sourceStyle = styleFromKey(key);
int limit = key.length() - styleSuffixLength(sourceStyle);
DateTimeUnit unit = DateTimeUnit.orNullFromString(key.substring(0, limit));
if (unit != null) {
// Record the fallback chain for the values.
// At formatting time, limit to 2 levels of fallback.
Style targetStyle = styleFromAlias(value);
if (sourceStyle == targetStyle) {
throw new ICUException("Invalid style fallback from " + sourceStyle + " to itself");
}
// Check for inconsistent fallbacks.
if (fallbackCache[sourceStyle.ordinal()] == null) {
fallbackCache[sourceStyle.ordinal()] = targetStyle;
} else if (fallbackCache[sourceStyle.ordinal()] != targetStyle) {
throw new ICUException(
"Inconsistent style fallback for style " + sourceStyle + " to " + targetStyle);
}
return;
}
}
@Override
public void put(UResource.Key key, UResource.Value value, boolean noFallback) {
// Main entry point to sink
if (value.getType() == ICUResourceBundle.ALIAS) {
return;
}
UResource.Table table = value.getTable();
// Process each key / value in this table.
for (int i = 0; table.getKeyAndValue(i, key, value); i++) {
if (value.getType() == ICUResourceBundle.ALIAS) {
handleAlias(key, value, noFallback);
} else {
// Remember style and unit for deeper levels.
style = styleFromKey(key);
int limit = key.length() - styleSuffixLength(style);
unit = DateTimeUnit.orNullFromString(key.substring(0, limit));
if (unit != null) {
// Process only if unitString is in the white list.
consumeTimeUnit(key, value);
}
}
}
}
RelDateTimeDataSink() {
}
}
private static class Loader {
private final ULocale ulocale;
public Loader(ULocale ulocale) {
this.ulocale = ulocale;
}
private String getDateTimePattern() {
Calendar cal = Calendar.getInstance(ulocale);
return Calendar.getDateAtTimePattern(cal, ulocale, DateFormat.MEDIUM);
}
public RelativeDateTimeFormatterData load() {
// Sink for traversing data.
RelDateTimeDataSink sink = new RelDateTimeDataSink();
ICUResourceBundle r = (ICUResourceBundle)UResourceBundle.
getBundleInstance(ICUData.ICU_BASE_NAME, ulocale);
r.getAllItemsWithFallback("fields", sink);
// Check fallbacks array for loops or too many levels.
for (Style testStyle : Style.values()) {
Style newStyle1 = fallbackCache[testStyle.ordinal()];
// Data loading guaranteed newStyle1 != testStyle.
if (newStyle1 != null) {
Style newStyle2 = fallbackCache[newStyle1.ordinal()];
if (newStyle2 != null) {
// No fallback should take more than 2 steps.
if (fallbackCache[newStyle2.ordinal()] != null) {
throw new IllegalStateException("Style fallback too deep");
}
}
}
}
return new RelativeDateTimeFormatterData(
sink.qualitativeUnitMap, sink.styleRelUnitPatterns,
getDateTimePattern());
}
}
private static final Cache cache = new Cache();
}
