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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
package com.ibm.icu.impl.number;
import com.ibm.icu.impl.ICUData;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.impl.number.PatternStringParser.ParsedPatternInfo;
import com.ibm.icu.number.NumberFormatter.GroupingStrategy;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* A full options object for grouping sizes.
*/
public class Grouper {
private static final Grouper GROUPER_NEVER = new Grouper((short) -1, (short) -1, (short) -2);
private static final Grouper GROUPER_MIN2 = new Grouper((short) -2, (short) -2, (short) -3);
private static final Grouper GROUPER_AUTO = new Grouper((short) -2, (short) -2, (short) -2);
private static final Grouper GROUPER_ON_ALIGNED = new Grouper((short) -4, (short) -4, (short) 1);
private static final Grouper GROUPER_WESTERN = new Grouper((short) 3, (short) 3, (short) 1);
private static final Grouper GROUPER_INDIC = new Grouper((short) 3, (short) 2, (short) 1);
private static final Grouper GROUPER_WESTERN_MIN2 = new Grouper((short) 3, (short) 3, (short) 2);
private static final Grouper GROUPER_INDIC_MIN2 = new Grouper((short) 3, (short) 2, (short) 2);
/**
* Convert from the GroupingStrategy enum to a Grouper object.
*/
public static Grouper forStrategy(GroupingStrategy grouping) {
switch (grouping) {
case OFF:
return GROUPER_NEVER;
case MIN2:
return GROUPER_MIN2;
case AUTO:
return GROUPER_AUTO;
case ON_ALIGNED:
return GROUPER_ON_ALIGNED;
case THOUSANDS:
return GROUPER_WESTERN;
default:
throw new AssertionError();
}
}
/**
* Resolve the values in Properties to a Grouper object.
*/
public static Grouper forProperties(DecimalFormatProperties properties) {
if (!properties.getGroupingUsed()) {
return GROUPER_NEVER;
}
short grouping1 = (short) properties.getGroupingSize();
short grouping2 = (short) properties.getSecondaryGroupingSize();
short minGrouping = (short) properties.getMinimumGroupingDigits();
grouping1 = grouping1 > 0 ? grouping1 : grouping2 > 0 ? grouping2 : grouping1;
grouping2 = grouping2 > 0 ? grouping2 : grouping1;
return getInstance(grouping1, grouping2, minGrouping);
}
public static Grouper getInstance(short grouping1, short grouping2, short minGrouping) {
if (grouping1 == -1) {
return GROUPER_NEVER;
} else if (grouping1 == 3 && grouping2 == 3 && minGrouping == 1) {
return GROUPER_WESTERN;
} else if (grouping1 == 3 && grouping2 == 2 && minGrouping == 1) {
return GROUPER_INDIC;
} else if (grouping1 == 3 && grouping2 == 3 && minGrouping == 2) {
return GROUPER_WESTERN_MIN2;
} else if (grouping1 == 3 && grouping2 == 2 && minGrouping == 2) {
return GROUPER_INDIC_MIN2;
} else {
return new Grouper(grouping1, grouping2, minGrouping);
}
}
private static short getMinGroupingForLocale(ULocale locale) {
// TODO: Cache this?
ICUResourceBundle resource = (ICUResourceBundle) UResourceBundle
.getBundleInstance(ICUData.ICU_BASE_NAME, locale);
String result = resource.getStringWithFallback("NumberElements/minimumGroupingDigits");
return Short.parseShort(result);
}
/**
* The primary grouping size, with the following special values:
*
* - -1 = no grouping
*
- -2 = needs locale data
*
- -4 = fall back to Western grouping if not in locale
*
*/
private final short grouping1;
/**
* The secondary grouping size, with the following special values:
*
* - -1 = no grouping
*
- -2 = needs locale data
*
- -4 = fall back to Western grouping if not in locale
*
*/
private final short grouping2;
/**
* The minimum grouping size, with the following special values:
*
* - -2 = needs locale data
*
- -3 = no less than 2
*
*/
private final short minGrouping;
private Grouper(short grouping1, short grouping2, short minGrouping) {
this.grouping1 = grouping1;
this.grouping2 = grouping2;
this.minGrouping = minGrouping;
}
public Grouper withLocaleData(ULocale locale, ParsedPatternInfo patternInfo) {
short minGrouping;
if (this.minGrouping == -2) {
minGrouping = getMinGroupingForLocale(locale);
} else if (this.minGrouping == -3) {
minGrouping = (short) Math.max(2, getMinGroupingForLocale(locale));
} else {
minGrouping = this.minGrouping;
}
if (this.grouping1 != -2 && this.grouping2 != -4) {
if (minGrouping == this.minGrouping) {
return this;
}
return getInstance(this.grouping1, this.grouping2, minGrouping);
}
short grouping1 = (short) (patternInfo.positive.groupingSizes & 0xffff);
short grouping2 = (short) ((patternInfo.positive.groupingSizes >>> 16) & 0xffff);
short grouping3 = (short) ((patternInfo.positive.groupingSizes >>> 32) & 0xffff);
if (grouping2 == -1) {
grouping1 = this.grouping1 == -4 ? (short) 3 : (short) -1;
}
if (grouping3 == -1) {
grouping2 = grouping1;
}
return getInstance(grouping1, grouping2, minGrouping);
}
public boolean groupAtPosition(int position, DecimalQuantity value) {
assert grouping1 != -2 && grouping1 != -4;
if (grouping1 == -1 || grouping1 == 0) {
// Either -1 or 0 means "no grouping"
return false;
}
position -= grouping1;
return position >= 0
&& (position % grouping2) == 0
&& value.getUpperDisplayMagnitude() - grouping1 + 1 >= minGrouping;
}
public short getPrimary() {
return grouping1;
}
public short getSecondary() {
return grouping2;
}
}