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package org.directwebremoting.convert;

import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;

import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.directwebremoting.extend.ProtocolConstants;

/**
 * An implementation of Converter for Dates.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DateConverter extends AbstractConverter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data) throws ConversionException
    {
        if (data.isNull())
        {
            return null;
        }

        String value = data.getValue();

        // If the text is null then the whole bean is null
        if (value.trim().equals(ProtocolConstants.INBOUND_NULL))
        {
            return null;
        }

        try
        {
            long millis = 0;
            if (value.length() > 0)
            {
                millis = Long.parseLong(value);
            }

            Date date = new Date(millis);
            if (paramType == Date.class)
            {
                return date;
            }
            else if (paramType == java.sql.Date.class)
            {
                return new java.sql.Date(date.getTime());
            }
            else if (paramType == Time.class)
            {
                return new Time(date.getTime());
            }
            else if (paramType == Timestamp.class)
            {
                return new Timestamp(date.getTime());
            }
            else if (paramType == Calendar.class)
            {
                Calendar cal = Calendar.getInstance();
                cal.setTime(date);
                return cal;
            }
            else
            {
                throw new ConversionException(paramType);
            }
        }
        catch (ConversionException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new ConversionException(paramType, ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws ConversionException
    {
        long millis;

        if (data instanceof Calendar)
        {
            Calendar cal = (Calendar) data;
            millis = cal.getTime().getTime();
        }
        else if (data instanceof Date)
        {
            Date date = (Date) data;
            millis = date.getTime();
        }
        else
        {
            throw new ConversionException(data.getClass());
        }

        return new NonNestedOutboundVariable("new Date(" + millis + ")");
    }
}