LocalizedNumberFormatter.java
// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
package com.ibm.icu.number;
import com.ibm.icu.impl.FormattedStringBuilder;
import com.ibm.icu.impl.StandardPlural;
import com.ibm.icu.impl.number.DecimalQuantity;
import com.ibm.icu.impl.number.DecimalQuantity_DualStorageBCD;
import com.ibm.icu.impl.number.LocalizedNumberFormatterAsFormat;
import com.ibm.icu.impl.number.MacroProps;
import com.ibm.icu.impl.number.MicroProps;
import com.ibm.icu.math.BigDecimal;
import com.ibm.icu.util.CurrencyAmount;
import com.ibm.icu.util.Measure;
import com.ibm.icu.util.MeasureUnit;
import java.math.BigInteger;
import java.text.Format;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
/**
* A NumberFormatter that has a locale associated with it; this means .format() methods are
* available.
*
* <p>Instances of this class are immutable and thread-safe.
*
* @see NumberFormatter
* @stable ICU 60
* @see NumberFormatter
*/
public class LocalizedNumberFormatter extends NumberFormatterSettings<LocalizedNumberFormatter> {
static final AtomicLongFieldUpdater<LocalizedNumberFormatter> callCount =
AtomicLongFieldUpdater.newUpdater(LocalizedNumberFormatter.class, "callCountInternal");
volatile long callCountInternal; // do not access directly; use callCount instead
volatile LocalizedNumberFormatter savedWithUnit;
volatile NumberFormatterImpl compiled;
LocalizedNumberFormatter(NumberFormatterSettings<?> parent, int key, Object value) {
super(parent, key, value);
}
/**
* Format the given byte, short, int, or long to a string using the settings specified in the
* NumberFormatter fluent setting chain.
*
* @param input The number to format.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
* @see NumberFormatter
*/
public FormattedNumber format(long input) {
return format(new DecimalQuantity_DualStorageBCD(input));
}
/**
* Format the given float or double to a string using the settings specified in the
* NumberFormatter fluent setting chain.
*
* @param input The number to format.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
* @see NumberFormatter
*/
public FormattedNumber format(double input) {
return format(new DecimalQuantity_DualStorageBCD(input));
}
/**
* Format the given {@link BigInteger}, {@link BigDecimal}, or other {@link Number} to a string
* using the settings specified in the NumberFormatter fluent setting chain.
*
* @param input The number to format.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
* @see NumberFormatter
*/
public FormattedNumber format(Number input) {
return format(new DecimalQuantity_DualStorageBCD(input));
}
/**
* Format the given {@link Measure} or {@link CurrencyAmount} to a string using the settings
* specified in the NumberFormatter fluent setting chain.
*
* <p>The unit specified here overrides any unit that may have been specified in the setter
* chain. This method is intended for cases when each input to the number formatter has a
* different unit.
*
* @param input The number to format.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
* @see NumberFormatter
*/
public FormattedNumber format(Measure input) {
DecimalQuantity fq = new DecimalQuantity_DualStorageBCD(input.getNumber());
MeasureUnit unit = input.getUnit();
FormattedStringBuilder string = new FormattedStringBuilder();
MicroProps micros = formatImpl(fq, unit, string);
return new FormattedNumber(string, fq, micros.outputUnit, micros.gender);
}
/**
* Creates a representation of this LocalizedNumberFormat as a {@link java.text.Format},
* enabling the use of this number formatter with APIs that need an object of that type, such as
* MessageFormat.
*
* <p>This API is not intended to be used other than for enabling API compatibility. The {@link
* #format} methods should normally be used when formatting numbers, not the Format object
* returned by this method.
*
* @return A Format wrapping this LocalizedNumberFormatter.
* @stable ICU 62
* @see NumberFormatter
*/
public Format toFormat() {
return new LocalizedNumberFormatterAsFormat(this, resolve().loc);
}
/**
* Disassociate the locale from this formatter.
*
* @return The fluent chain.
* @stable ICU 74
*/
public UnlocalizedNumberFormatter withoutLocale() {
return new UnlocalizedNumberFormatter(this, KEY_LOCALE, null);
}
/** Helper method that creates a FormattedStringBuilder and formats. */
private FormattedNumber format(DecimalQuantity fq) {
FormattedStringBuilder string = new FormattedStringBuilder();
MicroProps micros = formatImpl(fq, string);
return new FormattedNumber(string, fq, micros.outputUnit, micros.gender);
}
/**
* This is the core entrypoint to the number formatting pipeline. It performs self-regulation: a
* static code path for the first few calls, and compiling a more efficient data structure if
* called repeatedly.
*
* <p>This function is very hot, being called in every call to the number formatting pipeline.
*
* @param fq The quantity to be formatted.
* @param string The string builder into which to insert the result.
* @internal
* @deprecated ICU 60 This API is ICU internal only.
*/
@Deprecated
public MicroProps formatImpl(DecimalQuantity fq, FormattedStringBuilder string) {
if (computeCompiled()) {
return compiled.format(fq, string);
}
return NumberFormatterImpl.formatStatic(resolve(), fq, string);
}
/**
* Version of above for unit override.
*
* @internal
* @deprecated ICU 67 This API is ICU internal only.
*/
@Deprecated
public MicroProps formatImpl(
DecimalQuantity fq, MeasureUnit unit, FormattedStringBuilder string) {
// Use this formatter if possible
if (Objects.equals(resolve().unit, unit)) {
return formatImpl(fq, string);
}
// This mechanism saves the previously used unit, so if the user calls this method with the
// same unit multiple times in a row, they get a more efficient code path.
LocalizedNumberFormatter withUnit = savedWithUnit;
if (withUnit == null || !Objects.equals(withUnit.resolve().unit, unit)) {
withUnit = new LocalizedNumberFormatter(this, KEY_UNIT, unit);
savedWithUnit = withUnit;
}
return withUnit.formatImpl(fq, string);
}
/**
* @internal
* @deprecated This API is ICU internal only. Use {@link FormattedNumber#nextPosition} for
* related functionality.
*/
@Deprecated
public String getAffixImpl(boolean isPrefix, boolean isNegative) {
FormattedStringBuilder string = new FormattedStringBuilder();
byte signum = (byte) (isNegative ? -1 : 1);
// Always return affixes for plural form OTHER.
StandardPlural plural = StandardPlural.OTHER;
int prefixLength;
if (computeCompiled()) {
prefixLength = compiled.getPrefixSuffix(signum, plural, string);
} else {
prefixLength =
NumberFormatterImpl.getPrefixSuffixStatic(resolve(), signum, plural, string);
}
if (isPrefix) {
return string.subSequence(0, prefixLength).toString();
} else {
return string.subSequence(prefixLength, string.length()).toString();
}
}
private boolean computeCompiled() {
MacroProps macros = resolve();
// NOTE: In Java, the atomic increment logic is slightly different than ICU4C.
// It seems to be more efficient to make just one function call instead of two.
// Further benchmarking is required.
long currentCount = callCount.incrementAndGet(this);
if (currentCount == macros.threshold.longValue()) {
compiled = new NumberFormatterImpl(macros);
return true;
} else if (compiled != null) {
return true;
} else {
return false;
}
}
@Override
LocalizedNumberFormatter create(int key, Object value) {
return new LocalizedNumberFormatter(this, key, value);
}
}