package org.jtwig.render.expression.test.calculator;
import org.jtwig.exceptions.CalculationException;
import org.jtwig.model.expression.Expression;
import org.jtwig.model.expression.test.DivisibleByTestExpression;
import org.jtwig.model.position.Position;
import org.jtwig.render.RenderRequest;
import org.jtwig.render.expression.CalculateExpressionService;
import org.jtwig.util.ErrorMessageFormatter;
import org.jtwig.value.convert.Converter;
import java.math.BigDecimal;
import java.math.MathContext;
public class DivisibleByTestExpressionCalculator implements TestExpressionCalculator<DivisibleByTestExpression> {
@Override
public Object calculate(RenderRequest request, Position position, DivisibleByTestExpression test, Expression argument) {
CalculateExpressionService calculateExpressionService = request.getEnvironment().getRenderEnvironment().getCalculateExpressionService();
Converter<BigDecimal> numberConverter = request.getEnvironment().getValueEnvironment().getNumberConverter();
MathContext mathContext = request.getEnvironment().getValueEnvironment().getMathContext();
BigDecimal testValue = getNumber(request, calculateExpressionService, numberConverter, argument);
BigDecimal divisor = getNumber(request, calculateExpressionService, numberConverter, test.getExpression());
return testValue.remainder(divisor, mathContext).equals(BigDecimal.ZERO);
}
private BigDecimal getNumber(RenderRequest request, CalculateExpressionService calculateExpressionService, Converter<BigDecimal> numberConverter, Expression expression) {
Object calculate = calculateExpressionService.calculate(request, expression);
Converter.Result<BigDecimal> decimalResult = numberConverter.convert(calculate);
if (!decimalResult.isDefined()) {
throw new CalculationException(ErrorMessageFormatter.errorMessage(expression.getPosition(), String.format("Cannot convert '%s' to number", calculate)));
}
return decimalResult.get();
}
}