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com.ibm.icu.impl.number.CompactData Maven / Gradle / Ivy
International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
package com.ibm.icu.impl.number;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
import com.ibm.icu.impl.ICUData;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.impl.StandardPlural;
import com.ibm.icu.impl.UResource;
import com.ibm.icu.text.CompactDecimalFormat.CompactStyle;
import com.ibm.icu.util.ICUException;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* Datatype for compact notation data. Includes logic for data loading.
*/
public class CompactData implements MultiplierProducer {
public enum CompactType {
DECIMAL, CURRENCY
}
// A dummy object used when a "0" compact decimal entry is encountered. This is necessary
// in order to prevent falling back to root. Object equality ("==") is intended.
private static final String USE_FALLBACK = "";
private final String[] patterns;
private final byte[] multipliers;
private byte largestMagnitude;
private boolean isEmpty;
private static final int COMPACT_MAX_DIGITS = 15;
public CompactData() {
patterns = new String[(CompactData.COMPACT_MAX_DIGITS + 1) * StandardPlural.COUNT];
multipliers = new byte[CompactData.COMPACT_MAX_DIGITS + 1];
largestMagnitude = 0;
isEmpty = true;
}
public void populate(
ULocale locale,
String nsName,
CompactStyle compactStyle,
CompactType compactType) {
assert isEmpty;
CompactDataSink sink = new CompactDataSink(this);
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle
.getBundleInstance(ICUData.ICU_BASE_NAME, locale);
boolean nsIsLatn = nsName.equals("latn");
boolean compactIsShort = compactStyle == CompactStyle.SHORT;
// Fall back to latn numbering system and/or short compact style.
StringBuilder resourceKey = new StringBuilder();
getResourceBundleKey(nsName, compactStyle, compactType, resourceKey);
rb.getAllItemsWithFallbackNoFail(resourceKey.toString(), sink);
if (isEmpty && !nsIsLatn) {
getResourceBundleKey("latn", compactStyle, compactType, resourceKey);
rb.getAllItemsWithFallbackNoFail(resourceKey.toString(), sink);
}
if (isEmpty && !compactIsShort) {
getResourceBundleKey(nsName, CompactStyle.SHORT, compactType, resourceKey);
rb.getAllItemsWithFallbackNoFail(resourceKey.toString(), sink);
}
if (isEmpty && !nsIsLatn && !compactIsShort) {
getResourceBundleKey("latn", CompactStyle.SHORT, compactType, resourceKey);
rb.getAllItemsWithFallbackNoFail(resourceKey.toString(), sink);
}
// The last fallback should be guaranteed to return data.
if (isEmpty) {
throw new ICUException("Could not load compact decimal data for locale " + locale);
}
}
/** Produces a string like "NumberElements/latn/patternsShort/decimalFormat". */
private static void getResourceBundleKey(
String nsName,
CompactStyle compactStyle,
CompactType compactType,
StringBuilder sb) {
sb.setLength(0);
sb.append("NumberElements/");
sb.append(nsName);
sb.append(compactStyle == CompactStyle.SHORT ? "/patternsShort" : "/patternsLong");
sb.append(compactType == CompactType.DECIMAL ? "/decimalFormat" : "/currencyFormat");
}
/** Java-only method used by CLDR tooling. */
public void populate(Map> powersToPluralsToPatterns) {
assert isEmpty;
for (Map.Entry> magnitudeEntry : powersToPluralsToPatterns
.entrySet()) {
byte magnitude = (byte) (magnitudeEntry.getKey().length() - 1);
for (Map.Entry pluralEntry : magnitudeEntry.getValue().entrySet()) {
StandardPlural plural = StandardPlural.fromString(pluralEntry.getKey().toString());
String patternString = pluralEntry.getValue().toString();
patterns[getIndex(magnitude, plural)] = patternString;
int numZeros = countZeros(patternString);
if (numZeros > 0) { // numZeros==0 in certain cases, like Somali "Kun"
// Save the multiplier.
multipliers[magnitude] = (byte) (numZeros - magnitude - 1);
if (magnitude > largestMagnitude) {
largestMagnitude = magnitude;
}
isEmpty = false;
}
}
}
}
@Override
public int getMultiplier(int magnitude) {
if (magnitude < 0) {
return 0;
}
if (magnitude > largestMagnitude) {
magnitude = largestMagnitude;
}
return multipliers[magnitude];
}
public String getPattern(int magnitude, StandardPlural plural) {
if (magnitude < 0) {
return null;
}
if (magnitude > largestMagnitude) {
magnitude = largestMagnitude;
}
String patternString = patterns[getIndex(magnitude, plural)];
if (patternString == null && plural != StandardPlural.OTHER) {
// Fall back to "other" plural variant
patternString = patterns[getIndex(magnitude, StandardPlural.OTHER)];
}
if (patternString == USE_FALLBACK) { // == is intended
// Return null if USE_FALLBACK is present
patternString = null;
}
return patternString;
}
public void getUniquePatterns(Set output) {
assert output.isEmpty();
// NOTE: In C++, this is done more manually with a UVector.
// In Java, we can take advantage of JDK HashSet.
output.addAll(Arrays.asList(patterns));
output.remove(USE_FALLBACK);
output.remove(null);
}
private static final class CompactDataSink extends UResource.Sink {
CompactData data;
public CompactDataSink(CompactData data) {
this.data = data;
}
@Override
public void put(UResource.Key key, UResource.Value value, boolean isRoot) {
// traverse into the table of powers of ten
UResource.Table powersOfTenTable = value.getTable();
for (int i3 = 0; powersOfTenTable.getKeyAndValue(i3, key, value); ++i3) {
// Assumes that the keys are always of the form "10000" where the magnitude is the
// length of the key minus one. We expect magnitudes to be less than MAX_DIGITS.
byte magnitude = (byte) (key.length() - 1);
byte multiplier = data.multipliers[magnitude];
assert magnitude < COMPACT_MAX_DIGITS;
// Iterate over the plural variants ("one", "other", etc)
UResource.Table pluralVariantsTable = value.getTable();
for (int i4 = 0; pluralVariantsTable.getKeyAndValue(i4, key, value); ++i4) {
// Skip this magnitude/plural if we already have it from a child locale.
// Note: This also skips USE_FALLBACK entries.
StandardPlural plural = StandardPlural.fromString(key.toString());
if (data.patterns[getIndex(magnitude, plural)] != null) {
continue;
}
// The value "0" means that we need to use the default pattern and not fall back
// to parent locales. Example locale where this is relevant: 'it'.
String patternString = value.toString();
if (patternString.equals("0")) {
patternString = USE_FALLBACK;
}
// Save the pattern string. We will parse it lazily.
data.patterns[getIndex(magnitude, plural)] = patternString;
// If necessary, compute the multiplier: the difference between the magnitude
// and the number of zeros in the pattern.
if (multiplier == 0) {
int numZeros = countZeros(patternString);
if (numZeros > 0) { // numZeros==0 in certain cases, like Somali "Kun"
multiplier = (byte) (numZeros - magnitude - 1);
}
}
}
// Save the multiplier.
if (data.multipliers[magnitude] == 0) {
data.multipliers[magnitude] = multiplier;
if (magnitude > data.largestMagnitude) {
data.largestMagnitude = magnitude;
}
data.isEmpty = false;
} else {
assert data.multipliers[magnitude] == multiplier;
}
}
}
}
private static final int getIndex(int magnitude, StandardPlural plural) {
return magnitude * StandardPlural.COUNT + plural.ordinal();
}
private static final int countZeros(String patternString) {
// NOTE: This strategy for computing the number of zeros is a hack for efficiency.
// It could break if there are any 0s that aren't part of the main pattern.
int numZeros = 0;
for (int i = 0; i < patternString.length(); i++) {
if (patternString.charAt(i) == '0') {
numZeros++;
} else if (numZeros > 0) {
break; // zeros should always be contiguous
}
}
return numZeros;
}
}
