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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
package com.ibm.icu.number;
import java.math.RoundingMode;
import com.ibm.icu.impl.number.MacroProps;
import com.ibm.icu.impl.number.Padder;
import com.ibm.icu.number.NumberFormatter.DecimalSeparatorDisplay;
import com.ibm.icu.number.NumberFormatter.GroupingStrategy;
import com.ibm.icu.number.NumberFormatter.SignDisplay;
import com.ibm.icu.number.NumberFormatter.UnitWidth;
import com.ibm.icu.text.DecimalFormatSymbols;
import com.ibm.icu.text.NumberingSystem;
import com.ibm.icu.util.Currency;
import com.ibm.icu.util.Measure;
import com.ibm.icu.util.MeasureUnit;
import com.ibm.icu.util.NoUnit;
import com.ibm.icu.util.ULocale;
/**
* An abstract base class for specifying settings related to number formatting. This class is implemented
* by {@link UnlocalizedNumberFormatter} and {@link LocalizedNumberFormatter}. This class is not intended
* for public subclassing.
*
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
* @see NumberFormatter
*/
public abstract class NumberFormatterSettings> {
static final int KEY_MACROS = 0;
static final int KEY_LOCALE = 1;
static final int KEY_NOTATION = 2;
static final int KEY_UNIT = 3;
static final int KEY_PRECISION = 4;
static final int KEY_ROUNDING_MODE = 5;
static final int KEY_GROUPING = 6;
static final int KEY_PADDER = 7;
static final int KEY_INTEGER = 8;
static final int KEY_SYMBOLS = 9;
static final int KEY_UNIT_WIDTH = 10;
static final int KEY_SIGN = 11;
static final int KEY_DECIMAL = 12;
static final int KEY_SCALE = 13;
static final int KEY_THRESHOLD = 14;
static final int KEY_PER_UNIT = 15;
static final int KEY_MAX = 16;
private final NumberFormatterSettings parent;
private final int key;
private final Object value;
private volatile MacroProps resolvedMacros;
NumberFormatterSettings(NumberFormatterSettings parent, int key, Object value) {
this.parent = parent;
this.key = key;
this.value = value;
}
/**
* Specifies the notation style (simple, scientific, or compact) for rendering numbers.
*
*
* - Simple notation: "12,300"
*
- Scientific notation: "1.23E4"
*
- Compact notation: "12K"
*
*
*
* All notation styles will be properly localized with locale data, and all notation styles are
* compatible with units, rounding strategies, and other number formatter settings.
*
*
* Pass this method the return value of a {@link Notation} factory method. For example:
*
*
* NumberFormatter.with().notation(Notation.compactShort())
*
*
* The default is to use simple notation.
*
* @param notation
* The notation strategy to use.
* @return The fluent chain.
* @see Notation
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T notation(Notation notation) {
return create(KEY_NOTATION, notation);
}
/**
* Specifies the unit (unit of measure, currency, or percent) to associate with rendered numbers.
*
*
* - Unit of measure: "12.3 meters"
*
- Currency: "$12.30"
*
- Percent: "12.3%"
*
*
*
* Note: The unit can also be specified by passing a {@link Measure} to
* {@link LocalizedNumberFormatter#format(Measure)}. Units specified via the format method take
* precedence over units specified here. This setter is designed for situations when the unit is
* constant for the duration of the number formatting process.
*
*
* All units will be properly localized with locale data, and all units are compatible with notation
* styles, rounding strategies, and other number formatter settings.
*
*
* Pass this method any instance of {@link MeasureUnit}. For units of measure:
*
*
* NumberFormatter.with().unit(MeasureUnit.METER)
*
*
* Currency:
*
*
* NumberFormatter.with().unit(Currency.getInstance("USD"))
*
*
* Percent:
*
*
* NumberFormatter.with().unit(NoUnit.PERCENT)
*
*
*
* See {@link #perUnit} for information on how to format strings like "5 meters per second".
*
*
* The default is to render without units (equivalent to {@link NoUnit#BASE}).
*
* @param unit
* The unit to render.
* @return The fluent chain.
* @see MeasureUnit
* @see Currency
* @see NoUnit
* @see #perUnit
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T unit(MeasureUnit unit) {
return create(KEY_UNIT, unit);
}
/**
* Sets a unit to be used in the denominator. For example, to format "3 m/s", pass METER to the unit
* and SECOND to the perUnit.
*
*
* Pass this method any instance of {@link MeasureUnit}. For example:
*
*
* NumberFormatter.with().unit(MeasureUnit.METER).perUnit(MeasureUnit.SECOND)
*
*
*
* The default is not to display any unit in the denominator.
*
*
* If a per-unit is specified without a primary unit via {@link #unit}, the behavior is undefined.
*
* @param perUnit
* The unit to render in the denominator.
* @return The fluent chain
* @see #unit
* @draft ICU 61
* @provisional This API might change or be removed in a future release.
*/
public T perUnit(MeasureUnit perUnit) {
return create(KEY_PER_UNIT, perUnit);
}
/**
* Specifies the rounding precision to use when formatting numbers.
*
*
* - Round to 3 decimal places: "3.142"
*
- Round to 3 significant figures: "3.14"
*
- Round to the closest nickel: "3.15"
*
- Do not perform rounding: "3.1415926..."
*
*
*
* Pass this method the return value of one of the factory methods on {@link Precision}. For example:
*
*
* NumberFormatter.with().precision(Precision.fixedFraction(2))
*
*
*
* In most cases, the default rounding precision is to round to 6 fraction places; i.e.,
* Precision.maxFraction(6). The exceptions are if compact notation is being used, then
* the compact notation rounding precision is used (see {@link Notation#compactShort} for details), or
* if the unit is a currency, then standard currency rounding is used, which varies from currency to
* currency (see {@link Precision#currency} for details).
*
* @param precision
* The rounding precision to use.
* @return The fluent chain.
* @see Precision
* @draft ICU 62
* @provisional This API might change or be removed in a future release.
*/
public T precision(Precision precision) {
return create(KEY_PRECISION, precision);
}
/**
* @deprecated ICU 62 Use precision() instead. This method is for backwards compatibility and will be
* removed in ICU 64. See http://bugs.icu-project.org/trac/ticket/13746
*/
@Deprecated
public T rounding(Precision rounder) {
return precision(rounder);
}
/**
* Specifies how to determine the direction to round a number when it has more digits than fit in the
* desired precision. When formatting 1.235:
*
*
* - Ceiling rounding mode with integer precision: "2"
*
- Half-down rounding mode with 2 fixed fraction digits: "1.23"
*
- Half-up rounding mode with 2 fixed fraction digits: "1.24"
*
*
* The default is HALF_EVEN. For more information on rounding mode, see the ICU userguide here:
*
* http://userguide.icu-project.org/formatparse/numbers/rounding-modes
*
* @param roundingMode
* The rounding mode to use.
* @return The fluent chain.
* @see Precision
* @draft ICU 62
* @provisional This API might change or be removed in a future release.
*/
public T roundingMode(RoundingMode roundingMode) {
return create(KEY_ROUNDING_MODE, roundingMode);
}
/**
* Specifies the grouping strategy to use when formatting numbers.
*
*
* - Default grouping: "12,300" and "1,230"
*
- Grouping with at least 2 digits: "12,300" and "1230"
*
- No grouping: "12300" and "1230"
*
*
*
* The exact grouping widths will be chosen based on the locale.
*
*
* Pass this method an element from the {@link GroupingStrategy} enum. For example:
*
*
* NumberFormatter.with().grouping(GroupingStrategy.MIN2)
*
*
* The default is to perform grouping according to locale data; most locales, but not all locales,
* enable it by default.
*
* @param strategy
* The grouping strategy to use.
* @return The fluent chain.
* @see GroupingStrategy
* @draft ICU 61
* @provisional This API might change or be removed in a future release.
*/
public T grouping(GroupingStrategy strategy) {
return create(KEY_GROUPING, strategy);
}
/**
* Specifies the minimum and maximum number of digits to render before the decimal mark.
*
*
* - Zero minimum integer digits: ".08"
*
- One minimum integer digit: "0.08"
*
- Two minimum integer digits: "00.08"
*
*
*
* Pass this method the return value of {@link IntegerWidth#zeroFillTo(int)}. For example:
*
*
* NumberFormatter.with().integerWidth(IntegerWidth.zeroFillTo(2))
*
*
* The default is to have one minimum integer digit.
*
* @param style
* The integer width to use.
* @return The fluent chain.
* @see IntegerWidth
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T integerWidth(IntegerWidth style) {
return create(KEY_INTEGER, style);
}
/**
* Specifies the symbols (decimal separator, grouping separator, percent sign, numerals, etc.) to use
* when rendering numbers.
*
*
* - en_US symbols: "12,345.67"
*
- fr_FR symbols: "12 345,67"
*
- de_CH symbols: "12’345.67"
*
- my_MY symbols: "၁၂,၃၄၅.၆၇"
*
*
*
* Pass this method an instance of {@link DecimalFormatSymbols}. For example:
*
*
* NumberFormatter.with().symbols(DecimalFormatSymbols.getInstance(new ULocale("de_CH")))
*
*
*
* Note: DecimalFormatSymbols automatically chooses the best numbering system based
* on the locale. In the examples above, the first three are using the Latin numbering system, and
* the fourth is using the Myanmar numbering system.
*
*
* Note: The instance of DecimalFormatSymbols will be copied: changes made to the
* symbols object after passing it into the fluent chain will not be seen.
*
*
* Note: Calling this method will override the NumberingSystem previously specified
* in {@link #symbols(NumberingSystem)}.
*
*
* The default is to choose the symbols based on the locale specified in the fluent chain.
*
* @param symbols
* The DecimalFormatSymbols to use.
* @return The fluent chain.
* @see DecimalFormatSymbols
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T symbols(DecimalFormatSymbols symbols) {
symbols = (DecimalFormatSymbols) symbols.clone();
return create(KEY_SYMBOLS, symbols);
}
/**
* Specifies that the given numbering system should be used when fetching symbols.
*
*
* - Latin numbering system: "12,345"
*
- Myanmar numbering system: "၁၂,၃၄၅"
*
- Math Sans Bold numbering system: "𝟭𝟮,𝟯𝟰𝟱"
*
*
*
* Pass this method an instance of {@link NumberingSystem}. For example, to force the locale to
* always use the Latin alphabet numbering system (ASCII digits):
*
*
* NumberFormatter.with().symbols(NumberingSystem.LATIN)
*
*
*
* Note: Calling this method will override the DecimalFormatSymbols previously
* specified in {@link #symbols(DecimalFormatSymbols)}.
*
*
* The default is to choose the best numbering system for the locale.
*
* @param ns
* The NumberingSystem to use.
* @return The fluent chain.
* @see NumberingSystem
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T symbols(NumberingSystem ns) {
return create(KEY_SYMBOLS, ns);
}
/**
* Sets the width of the unit (measure unit or currency). Most common values:
*
*
* - Short: "$12.00", "12 m"
*
- ISO Code: "USD 12.00"
*
- Full name: "12.00 US dollars", "12 meters"
*
*
*
* Pass an element from the {@link UnitWidth} enum to this setter. For example:
*
*
* NumberFormatter.with().unitWidth(UnitWidth.FULL_NAME)
*
*
*
* The default is the SHORT width.
*
* @param style
* The width to use when rendering numbers.
* @return The fluent chain
* @see UnitWidth
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T unitWidth(UnitWidth style) {
return create(KEY_UNIT_WIDTH, style);
}
/**
* Sets the plus/minus sign display strategy. Most common values:
*
*
* - Auto: "123", "-123"
*
- Always: "+123", "-123"
*
- Accounting: "$123", "($123)"
*
*
*
* Pass an element from the {@link SignDisplay} enum to this setter. For example:
*
*
* NumberFormatter.with().sign(SignDisplay.ALWAYS)
*
*
*
* The default is AUTO sign display.
*
* @param style
* The sign display strategy to use when rendering numbers.
* @return The fluent chain
* @see SignDisplay
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T sign(SignDisplay style) {
return create(KEY_SIGN, style);
}
/**
* Sets the decimal separator display strategy. This affects integer numbers with no fraction part.
* Most common values:
*
*
* - Auto: "1"
*
- Always: "1."
*
*
*
* Pass an element from the {@link DecimalSeparatorDisplay} enum to this setter. For example:
*
*
* NumberFormatter.with().decimal(DecimalSeparatorDisplay.ALWAYS)
*
*
*
* The default is AUTO decimal separator display.
*
* @param style
* The decimal separator display strategy to use when rendering numbers.
* @return The fluent chain
* @see DecimalSeparatorDisplay
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
public T decimal(DecimalSeparatorDisplay style) {
return create(KEY_DECIMAL, style);
}
/**
* Sets a scale (multiplier) to be used to scale the number by an arbitrary amount before formatting.
* Most common values:
*
*
* - Multiply by 100: useful for percentages.
*
- Multiply by an arbitrary value: useful for unit conversions.
*
*
*
* Pass an element from a {@link Scale} factory method to this setter. For example:
*
*
* NumberFormatter.with().scale(Scale.powerOfTen(2))
*
*
*
* The default is to not apply any multiplier.
*
* @param scale
* An amount to be multiplied against numbers before formatting.
* @return The fluent chain
* @see Scale
* @draft ICU 62
* @provisional This API might change or be removed in a future release.
*/
public T scale(Scale scale) {
return create(KEY_SCALE, scale);
}
/**
* Internal method to set a starting macros.
*
* @internal
* @deprecated ICU 60 This API is ICU internal only.
*/
@Deprecated
public T macros(MacroProps macros) {
return create(KEY_MACROS, macros);
}
/**
* Set the padding strategy. May be added to ICU 61; see #13338.
*
* @internal
* @deprecated ICU 60 This API is ICU internal only.
*/
@Deprecated
public T padding(Padder padder) {
return create(KEY_PADDER, padder);
}
/**
* Internal fluent setter to support a custom regulation threshold. A threshold of 1 causes the data
* structures to be built right away. A threshold of 0 prevents the data structures from being built.
*
* @internal
* @deprecated ICU 60 This API is ICU internal only.
*/
@Deprecated
public T threshold(Long threshold) {
return create(KEY_THRESHOLD, threshold);
}
/**
* Creates a skeleton string representation of this number formatter. A skeleton string is a
* locale-agnostic serialized form of a number formatter.
*
* Not all options are capable of being represented in the skeleton string; for example, a
* DecimalFormatSymbols object. If any such option is encountered, an
* {@link UnsupportedOperationException} is thrown.
*
* The returned skeleton is in normalized form, such that two number formatters with equivalent
* behavior should produce the same skeleton.
*
* @return A number skeleton string with behavior corresponding to this number formatter.
* @throws UnsupportedOperationException
* If the number formatter has an option that cannot be represented in a skeleton string.
* @draft ICU 62
* @provisional This API might change or be removed in a future release.
*/
public String toSkeleton() {
return NumberSkeletonImpl.generate(resolve());
}
/* package-protected */ abstract T create(int key, Object value);
MacroProps resolve() {
if (resolvedMacros != null) {
return resolvedMacros;
}
// Although the linked-list fluent storage approach requires this method,
// my benchmarks show that linked-list is still faster than a full clone
// of a MacroProps object at each step.
// TODO: Remove the reference to the parent after the macros are resolved?
MacroProps macros = new MacroProps();
NumberFormatterSettings current = this;
while (current != null) {
switch (current.key) {
case KEY_MACROS:
macros.fallback((MacroProps) current.value);
break;
case KEY_LOCALE:
if (macros.loc == null) {
macros.loc = (ULocale) current.value;
}
break;
case KEY_NOTATION:
if (macros.notation == null) {
macros.notation = (Notation) current.value;
}
break;
case KEY_UNIT:
if (macros.unit == null) {
macros.unit = (MeasureUnit) current.value;
}
break;
case KEY_PRECISION:
if (macros.precision == null) {
macros.precision = (Precision) current.value;
}
break;
case KEY_ROUNDING_MODE:
if (macros.roundingMode == null) {
macros.roundingMode = (RoundingMode) current.value;
}
break;
case KEY_GROUPING:
if (macros.grouping == null) {
macros.grouping = /* (Object) */ current.value;
}
break;
case KEY_PADDER:
if (macros.padder == null) {
macros.padder = (Padder) current.value;
}
break;
case KEY_INTEGER:
if (macros.integerWidth == null) {
macros.integerWidth = (IntegerWidth) current.value;
}
break;
case KEY_SYMBOLS:
if (macros.symbols == null) {
macros.symbols = /* (Object) */ current.value;
}
break;
case KEY_UNIT_WIDTH:
if (macros.unitWidth == null) {
macros.unitWidth = (UnitWidth) current.value;
}
break;
case KEY_SIGN:
if (macros.sign == null) {
macros.sign = (SignDisplay) current.value;
}
break;
case KEY_DECIMAL:
if (macros.decimal == null) {
macros.decimal = (DecimalSeparatorDisplay) current.value;
}
break;
case KEY_SCALE:
if (macros.scale == null) {
macros.scale = (Scale) current.value;
}
break;
case KEY_THRESHOLD:
if (macros.threshold == null) {
macros.threshold = (Long) current.value;
}
break;
case KEY_PER_UNIT:
if (macros.perUnit == null) {
macros.perUnit = (MeasureUnit) current.value;
}
break;
default:
throw new AssertionError("Unknown key: " + current.key);
}
current = current.parent;
}
resolvedMacros = macros;
return macros;
}
/**
* {@inheritDoc}
*
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
@Override
public int hashCode() {
return resolve().hashCode();
}
/**
* {@inheritDoc}
*
* @draft ICU 60
* @provisional This API might change or be removed in a future release.
*/
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other == null) {
return false;
}
if (!(other instanceof NumberFormatterSettings)) {
return false;
}
return resolve().equals(((NumberFormatterSettings) other).resolve());
}
}