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generics + raw types + serializer

// DateAttribute.java
// $Id: DateAttribute.java,v 1.6 2013/10/18 13:42:25 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1996.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.tools.resources;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class DateAttribute extends LongAttribute {

    private static final long serialVersionUID = 6816635455379978245L;
    String cachedPickledValue = null;
    Long cachedPickledLong = null;

    public DateAttribute(String name, Object def, int flags) {
        super(name, (Long) def, flags);
        this.type = "java.util.Date".intern();
    }

    public DateAttribute() {
        super();
    }

    /**
     * Get a DateFormat compliant with RFC 822 updated by RFC 1123.
     *
     * @return a SimpleDateFormat instance.
     */
    private SimpleDateFormat getDateFormatter() {
        SimpleDateFormat formatter =
                new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz");
        formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
        return formatter;
    }

    /**
     * Pickle an integer to the given output stream.
     *
     * @param obj The object to pickle.
     */

    public String pickle(Object obj) {
        if (obj == cachedPickledLong) {
            if (cachedPickledValue == null) {
                SimpleDateFormat formatter = getDateFormatter();
                String s = formatter.format(new Date(((Long) obj).longValue()));
                cachedPickledValue = s;
                return s;
            }
            return cachedPickledValue;
        }
        SimpleDateFormat formatter = getDateFormatter();
        return formatter.format(new Date(((Long) obj).longValue()));
    }

    /**
     * Unpickle an integer from the given input stream.
     *
     * @param value the string representation of this integer
     * @return An instance of Integer.
     */

    public Object unpickle(String value) {
        try {
            SimpleDateFormat formatter = getDateFormatter();
            Long l = new Long((formatter.parse(value)).getTime());
            cachedPickledLong = l;
            return l;
        } catch (ParseException ex) {
            return new Long(-1);
        }
    }

}