Subtraction.java example

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checker-framework-master
import org.checkerframework.checker.units.UnitsTools;
import org.checkerframework.checker.units.qual.*;

public class Subtraction {
    // Subtraction is legal when the operands have the same units.
    void good() {
        // Units
        // Amperes
        @A int aAmpere = 5 * UnitsTools.A;
        @A int bAmpere = 5 * UnitsTools.A;
        @A int sAmpere = aAmpere - bAmpere;

        // Candela
        @cd int aCandela = 5 * UnitsTools.cd;
        @cd int bCandela = 5 * UnitsTools.cd;
        @cd int sCandela = aCandela - bCandela;

        // Celsius
        @C int aCelsius = 5 * UnitsTools.C;
        @C int bCelsius = 5 * UnitsTools.C;
        @C int sCelsius = aCelsius - bCelsius;

        // Gram
        @g int aGram = 5 * UnitsTools.g;
        @g int bGram = 5 * UnitsTools.g;
        @g int sGram = aGram - bGram;

        // Hour
        @h int aHour = 5 * UnitsTools.h;
        @h int bHour = 5 * UnitsTools.h;
        @h int sHour = aHour - bHour;

        // Kelvin
        @K int aKelvin = 5 * UnitsTools.K;
        @K int bKelvin = 5 * UnitsTools.K;
        @K int sKelvin = aKelvin - bKelvin;

        // Kilogram
        @kg int aKilogram = 5 * UnitsTools.kg;
        @kg int bKilogram = 5 * UnitsTools.kg;
        @kg int sKilogram = aKilogram - bKilogram;

        // Kilometer
        @km int aKilometer = 5 * UnitsTools.km;
        @km int bKilometer = 5 * UnitsTools.km;
        @km int sKilometer = aKilometer - bKilometer;

        // Square kilometer
        @km2 int aSquareKilometer = 5 * UnitsTools.km2;
        @km2 int bSquareKilometer = 5 * UnitsTools.km2;
        @km2 int sSquareKilometer = aSquareKilometer - bSquareKilometer;

        // Kilometer per hour
        @kmPERh int aKilometerPerHour = 5 * UnitsTools.kmPERh;
        @kmPERh int bKilometerPerHour = 5 * UnitsTools.kmPERh;
        @kmPERh int sKilometerPerHour = aKilometerPerHour - bKilometerPerHour;

        // Meter
        @m int aMeter = 5 * UnitsTools.m;
        @m int bMeter = 5 * UnitsTools.m;
        @m int sMeter = aMeter - bMeter;

        // Square meter
        @m2 int aSquareMeter = 5 * UnitsTools.m2;
        @m2 int bSquareMeter = 5 * UnitsTools.m2;
        @m2 int sSquareMeter = aSquareMeter - bSquareMeter;

        // Meter per second
        @mPERs int aMeterPerSecond = 5 * UnitsTools.mPERs;
        @mPERs int bMeterPerSecond = 5 * UnitsTools.mPERs;
        @mPERs int sMeterPerSecond = aMeterPerSecond - bMeterPerSecond;

        // Meter per second square
        @mPERs2 int aMeterPerSecondSquare = 5 * UnitsTools.mPERs2;
        @mPERs2 int bMeterPerSecondSquare = 5 * UnitsTools.mPERs2;
        @mPERs2 int sMeterPerSecondSquare = aMeterPerSecondSquare - bMeterPerSecondSquare;

        // Minute
        @min int aMinute = 5 * UnitsTools.min;
        @min int bMinute = 5 * UnitsTools.min;
        @min int sMinute = aMinute - bMinute;

        // Millimeter
        @mm int aMillimeter = 5 * UnitsTools.mm;
        @mm int bMillimeter = 5 * UnitsTools.mm;
        @mm int sMillimeter = aMillimeter - bMillimeter;

        // Square millimeter
        @mm2 int aSquareMillimeter = 5 * UnitsTools.mm2;
        @mm2 int bSquareMillimeter = 5 * UnitsTools.mm2;
        @mm2 int sSquareMillimeter = aSquareMillimeter - bSquareMillimeter;

        // Mole
        @mol int aMole = 5 * UnitsTools.mol;
        @mol int bMole = 5 * UnitsTools.mol;
        @mol int sMole = aMole - bMole;

        // Second
        @s int aSecond = 5 * UnitsTools.s;
        @s int bSecond = 5 * UnitsTools.s;
        @s int sSecond = aSecond - bSecond;
    }

    // Subtraction is illegal when the operands have different units or one
    // is unqualified.  In these tests, we cycle between the result and
    // the first or second operand having an incorrect type.
    void bad() {
        // Dimensions
        // Acceleration
        @Acceleration int aAcceleration = 5 * UnitsTools.mPERs2;
        @Acceleration int bAcceleration = 5 * UnitsTools.mPERs2;

        // Area
        @Area int aArea = 5 * UnitsTools.km2;
        @Area int bArea = 5 * UnitsTools.mm2;

        // Current
        @Current int aCurrent = 5 * UnitsTools.A;
        @Current int bCurrent = 5 * UnitsTools.A;

        // Length
        @Length int aLength = 5 * UnitsTools.m;
        @Length int bLength = 5 * UnitsTools.mm;

        // Luminance
        @Luminance int aLuminance = 5 * UnitsTools.cd;
        @Luminance int bLuminance = 5 * UnitsTools.cd;

        // Mass
        @Mass int aMass = 5 * UnitsTools.kg;
        @Mass int bMass = 5 * UnitsTools.g;

        // Substance
        @Substance int aSubstance = 5 * UnitsTools.mol;
        @Substance int bSubstance = 5 * UnitsTools.mol;

        // Temperature
        @Temperature int aTemperature = 5 * UnitsTools.K;
        @Temperature int bTemperature = 5 * UnitsTools.K;

        // Time
        @Time int aTime = 5 * UnitsTools.min;
        @Time int bTime = 5 * UnitsTools.h;

        // Dimensions
        //:: error: (assignment.type.incompatible)
        @Acceleration int sAcceleration = aAcceleration - bMass;

        // Area
        //:: error: (assignment.type.incompatible)
        @Luminance int sLuminance = aArea - bArea;

        // Current
        //:: error: (assignment.type.incompatible)
        @Current int sCurrent = aMass - bCurrent;

        // Length
        //:: error: (assignment.type.incompatible)
        @Length int sLength = aLength - bSubstance;

        // Luminance
        //:: error: (assignment.type.incompatible)
        @Temperature int sTemperature = aLuminance - bLuminance;

        // Mass
        //:: error: (assignment.type.incompatible)
        @Mass int sMass = aTemperature - bMass;

        // Substance
        //:: error: (assignment.type.incompatible)
        @Substance int sSubstance = aSubstance - bCurrent;

        // Temperature
        //:: error: (assignment.type.incompatible)
        @Area int sArea = aTemperature - bTemperature;

        // Time
        //:: error: (assignment.type.incompatible)
        @Time int sTime = aArea - bTime;

        // Units
        // Amperes
        @A int aAmpere = 5 * UnitsTools.A;
        @A int bAmpere = 5 * UnitsTools.A;

        // Candela
        @cd int aCandela = 5 * UnitsTools.cd;
        @cd int bCandela = 5 * UnitsTools.cd;

        // Celsius
        @C int aCelsius = 5 * UnitsTools.C;
        @C int bCelsius = 5 * UnitsTools.C;

        // Gram
        @g int aGram = 5 * UnitsTools.g;
        @g int bGram = 5 * UnitsTools.g;

        // Hour
        @h int aHour = 5 * UnitsTools.h;
        @h int bHour = 5 * UnitsTools.h;

        // Kelvin
        @K int aKelvin = 5 * UnitsTools.K;
        @K int bKelvin = 5 * UnitsTools.K;

        // Kilogram
        @kg int aKilogram = 5 * UnitsTools.kg;
        @kg int bKilogram = 5 * UnitsTools.kg;

        // Kilometer
        @km int aKilometer = 5 * UnitsTools.km;
        @km int bKilometer = 5 * UnitsTools.km;

        // Square kilometer
        @km2 int aSquareKilometer = 5 * UnitsTools.km2;
        @km2 int bSquareKilometer = 5 * UnitsTools.km2;

        // Kilometer per hour
        @kmPERh int aKilometerPerHour = 5 * UnitsTools.kmPERh;
        @kmPERh int bKilometerPerHour = 5 * UnitsTools.kmPERh;

        // Meter
        @m int aMeter = 5 * UnitsTools.m;
        @m int bMeter = 5 * UnitsTools.m;

        // Square meter
        @m2 int aSquareMeter = 5 * UnitsTools.m2;
        @m2 int bSquareMeter = 5 * UnitsTools.m2;

        // Meter per second
        @mPERs int aMeterPerSecond = 5 * UnitsTools.mPERs;
        @mPERs int bMeterPerSecond = 5 * UnitsTools.mPERs;

        // Meter per second square
        @mPERs2 int aMeterPerSecondSquare = 5 * UnitsTools.mPERs2;
        @mPERs2 int bMeterPerSecondSquare = 5 * UnitsTools.mPERs2;

        // Minute
        @min int aMinute = 5 * UnitsTools.min;
        @min int bMinute = 5 * UnitsTools.min;

        // Millimeter
        @mm int aMillimeter = 5 * UnitsTools.mm;
        @mm int bMillimeter = 5 * UnitsTools.mm;

        // Square millimeter
        @mm2 int aSquareMillimeter = 5 * UnitsTools.mm2;
        @mm2 int bSquareMillimeter = 5 * UnitsTools.mm2;

        // Mole
        @mol int aMole = 5 * UnitsTools.mol;
        @mol int bMole = 5 * UnitsTools.mol;

        // Second
        @s int aSecond = 5 * UnitsTools.s;
        @s int bSecond = 5 * UnitsTools.s;

        // Units
        // Amperes
        //:: error: (assignment.type.incompatible)
        @g int sGram = aAmpere - bAmpere;

        // Candela
        //:: error: (assignment.type.incompatible)
        @cd int sCandela = aTemperature - bCandela;

        // Celsius
        //:: error: (assignment.type.incompatible)
        @C int sCelsius = aCelsius - bMillimeter;

        // Gram
        //:: error: (assignment.type.incompatible)
        @kg int sKilogram = aGram - bGram;

        // Hour
        //:: error: (assignment.type.incompatible)
        @h int sHour = aSquareMeter - bHour;

        // Kelvin
        //:: error: (assignment.type.incompatible)
        @K int sKelvin = aKelvin - bSecond;

        // Kilogram
        //:: error: (assignment.type.incompatible)
        @kmPERh int sKilometerPerHour = aKilogram - bKilogram;

        // Kilometer
        //:: error: (assignment.type.incompatible)
        @km int sKilometer = aCandela - bKilometer;

        // Square kilometer
        //:: error: (assignment.type.incompatible)
        @km2 int sSquareKilometer = aSquareKilometer - bAmpere;

        // Kilometer per hour
        //:: error: (assignment.type.incompatible)
        @mPERs int sMeterPerSecond = aKilometerPerHour - bKilometerPerHour;

        // Meter
        //:: error: (assignment.type.incompatible)
        @m int sMeter = aHour - bMeter;

        // Square meter
        //:: error: (assignment.type.incompatible)
        @m2 int sSquareMeter = aSquareMeter - bGram;

        // Meter per second
        //:: error: (assignment.type.incompatible)
        @mm2 int sSquareMillimeter = aMeterPerSecond - bMeterPerSecond;

        // Meter per second square
        //:: error: (assignment.type.incompatible)
        @mPERs2 int sMeterPerSecondSquare = aMeterPerSecondSquare - bMeter;

        // Minute
        //:: error: (assignment.type.incompatible)
        @min int sMinute = aMole - bMinute;

        // Millimeter
        //:: error: (assignment.type.incompatible)
        @mm int sMillimeter = aMillimeter - bHour;

        // Square millimeter
        //:: error: (assignment.type.incompatible)
        @A int sAmpere = aSquareMillimeter - bSquareMillimeter;

        // Mole
        //:: error: (assignment.type.incompatible)
        @mol int sMole = aCandela - bMole;

        // Second
        //:: error: (assignment.type.incompatible)
        @s int sSecond = aSecond - bSquareKilometer;
    }
}