package org.jtwig.render.expression.calculator.operation.unary.calculators;
import org.jtwig.exceptions.CalculationException;
import org.jtwig.model.expression.Expression;
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;
public class NegativeOperationCalculator implements UnaryOperationCalculator {
@Override
public Object calculate(RenderRequest request, Position position, Expression operand) {
CalculateExpressionService calculateExpressionService = request.getEnvironment().getRenderEnvironment().getCalculateExpressionService();
Converter<BigDecimal> numberConverter = request.getEnvironment().getValueEnvironment().getNumberConverter();
Object calculate = calculateExpressionService.calculate(request, operand);
Converter.Result<BigDecimal> decimalResult = numberConverter.convert(calculate);
if (!decimalResult.isDefined()) {
throw new CalculationException(ErrorMessageFormatter.errorMessage(position, String.format("Unable to convert '%s' to a number", calculate)));
}
return decimalResult.get().multiply(new BigDecimal("-1"));
}
}