Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.date;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import org.apache.commons.lang3.Range;

import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_TIME;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class TimeFunction extends AbstractFunction {

    public TimeFunction() {

        super("Date", FUNCTION_TIME,Range.is(1),

            "Returns a time from the arguments",

            FUNCTION_TIME+"({{time}})",

            new String[]{

                "time - a string with a time"

            },

            "Time"

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) {

        Object date_obj = getObject(args, 0);

        if( date_obj instanceof Date ) {

            Date x = new Date(((Date) date_obj).getTime());

            x.setDate(0);

            x.setMonth(0);

            x.setYear(0);

            return x;

        }

        String date = getStr(args, 0);

        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");

        try {

            Date x = df.parse(date);

            x.setDate(0);

            x.setMonth(0);

            x.setYear(0);

            return x;

        } catch (ParseException ex) {

            throw new RuntimeException("Can't parse time value '"+date+"' expected format 'HH:mm:ss'.", ex);

        }

    }

}