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1 // © 2020 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 package com.ibm.icu.impl.number;
4 
5 import java.math.BigDecimal;
6 import java.util.List;
7 
8 import com.ibm.icu.impl.units.ComplexUnitsConverter;
9 import com.ibm.icu.impl.units.MeasureUnitImpl;
10 import com.ibm.icu.impl.units.UnitsRouter;
11 import com.ibm.icu.util.MeasureUnit;
12 import com.ibm.icu.util.ULocale;
13 
14 public class UsagePrefsHandler implements MicroPropsGenerator {
15 
16     private final MicroPropsGenerator fParent;
17     private UnitsRouter fUnitsRouter;
18 
UsagePrefsHandler(ULocale locale, MeasureUnit inputUnit, String usage, MicroPropsGenerator parent)19     public UsagePrefsHandler(ULocale locale, MeasureUnit inputUnit, String usage, MicroPropsGenerator parent) {
20         assert parent != null;
21 
22         this.fParent = parent;
23         this.fUnitsRouter = new UnitsRouter(MeasureUnitImpl.forIdentifier(inputUnit.getIdentifier()), locale, usage);
24     }
25 
26     /**
27      * Populates micros.mixedMeasures and modifies quantity, based on the values
28      * in measures.
29      */
30     protected static void
mixedMeasuresToMicros(ComplexUnitsConverter.ComplexConverterResult complexConverterResult, DecimalQuantity quantity, MicroProps outMicros)31     mixedMeasuresToMicros(ComplexUnitsConverter.ComplexConverterResult complexConverterResult, DecimalQuantity quantity, MicroProps outMicros) {
32         outMicros.mixedMeasures = complexConverterResult.measures;
33         outMicros.indexOfQuantity = complexConverterResult.indexOfQuantity;
34         quantity.setToBigDecimal((BigDecimal) outMicros.mixedMeasures.get(outMicros.indexOfQuantity).getNumber());
35     }
36 
37     /**
38      * Returns the list of possible output units, i.e. the full set of
39      * preferences, for the localized, usage-specific unit preferences.
40      * <p>
41      * The returned pointer should be valid for the lifetime of the
42      * UsagePrefsHandler instance.
43      */
getOutputUnits()44     public List<MeasureUnit> getOutputUnits() {
45         return fUnitsRouter.getOutputUnits();
46     }
47 
48     /**
49      * Obtains the appropriate output value, MeasureUnit and
50      * rounding/precision behaviour from the UnitsRouter.
51      * <p>
52      * The output unit is passed on to the LongNameHandler via
53      * micros.outputUnit.
54      */
55     @Override
processQuantity(DecimalQuantity quantity)56     public MicroProps processQuantity(DecimalQuantity quantity) {
57         MicroProps micros = this.fParent.processQuantity(quantity);
58 
59         quantity.roundToInfinity(); // Enables toDouble
60         final UnitsRouter.RouteResult routed = fUnitsRouter.route(quantity.toBigDecimal(), micros);
61         micros.outputUnit = routed.outputUnit.build();
62         UsagePrefsHandler.mixedMeasuresToMicros(routed.complexConverterResult, quantity, micros);
63         return micros;
64     }
65 }
66