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Various utility classes to ease development of plugins

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package kg.apc.charting;

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

import org.apache.jorphan.gui.NumberRenderer;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;

public class DateTimeRenderer
        extends NumberRenderer {

    /**
     *
     */
    private static final Logger log = LoggingManager.getLoggerForClass();
    protected final SimpleDateFormat dateFormatter;
    private long relativeStartTime = 0;
    private static final String EMPTY = "";
    public static final String HHMMSS = "HH:mm:ss";

    /**
     *
     */
    public DateTimeRenderer() {
        super();
        dateFormatter = (SimpleDateFormat) SimpleDateFormat.getInstance();
        //log.info("Simple inst");
    }

    /**
     *
     * @param format
     */
    public DateTimeRenderer(String format) {
        super();
        dateFormatter = new SimpleDateFormat(format);
        // log.info("Format inst " + format);
    }

    /**
     * Creates new instance
     * @param format - date/time format
     * @param aRelativeStartTime - test start time
     */
    public DateTimeRenderer(String format, long aRelativeStartTime) {
        this(format);
        TimeZone utc = TimeZone.getTimeZone("UTC");
        dateFormatter.setTimeZone(utc);

        relativeStartTime = aRelativeStartTime;
    }

    @Override
    public void setValue(Object value) {
        if (value == null) {
            setText(EMPTY);
        } else {
            if (value instanceof Double) {
                value=Math.round((Double) value);
            }
                setLongValue((Long) value);
        }
    }

    /**
     * Sets value to render
     * @param value
     */
    private void setLongValue(Long value) {
        setText(dateFormatter.format(value - relativeStartTime));
    }
}