com.obdobion.algebrain.function.FuncDateTimeFmt Maven / Gradle / Ivy

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package com.obdobion.algebrain.function;

import java.text.ParseException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import com.obdobion.algebrain.Function;
import com.obdobion.algebrain.ValueStack;
import com.obdobion.algebrain.token.TokVariable;
import com.obdobion.calendar.CalendarFactory;

/**
 * 
 * FuncDateTimeFmt class.
 * 
 *
 * @author Chris DeGreef [email protected]
 */
public class FuncDateTimeFmt extends Function
{

    /**
     * 
     * Constructor for FuncDate.
     * 
     */
    public FuncDateTimeFmt()
    {
        super();
    }

    /**
     * 
     * Constructor for FuncDateTimeFmt.
     * 
     *
     * @param var a {@link com.obdobion.algebrain.token.TokVariable} object.
     */
    public FuncDateTimeFmt(final TokVariable var)
    {
        super(var);
    }

    /** {@inheritDoc} */
    @Override
    public void resolve(final ValueStack values) throws Exception
    {
        if (values.size() < 2)
            throw new Exception("missing operands for " + toString());

        try
        {
            String adjustments = "";

            if (getParameterCount() == 3)
                adjustments = values.popString();

            final DateTimeFormatter dtf = DateTimeFormatter.ofPattern(values.popString());

            final String dateInputObject = values.popString();
            final LocalDateTime convertedInputDate = LocalDateTime.parse(dateInputObject, dtf);

            values.push(CalendarFactory.modify(convertedInputDate, adjustments));

        } catch (final ParseException e)
        {
            e.fillInStackTrace();
            throw new Exception(toString() + "; " + e.getMessage(), e);
        }
    }

    /** {@inheritDoc} */
    @Override
    public String toString()
    {
        return "function(dateTimeFmt)";
    }
}