import java.util.*;
import java.text.*;

public class RightFormat extends java.text.Format
{
    private int size;
    private char pad;

    public RightFormat(int fieldsize, char padchar) {
	if (fieldsize <= 1) 
	    throw new IllegalArgumentException("fieldsize must be > 1");
	size = fieldsize;
	pad = padchar;
    }

    public RightFormat(int fieldsize) {
	this(fieldsize, ' ');
    }
	
    public StringBuffer format(Object obj, 
			       StringBuffer toAppendTo, 
			       FieldPosition pos)
    {
	String val;
	int ix;
	val = obj.toString();
	for(ix = size; ix > val.length(); ix--)
	    toAppendTo.append(pad);
	toAppendTo.append(val);
	return toAppendTo;
    }

    
    public Object parseObject(String source, ParsePosition status) 
    {
	int start, end, ix;
	String ret = "";
	end = status.getIndex() + size;
	start = status.getIndex();
	for(ix = start; ix < end; ix++) {
	    if (source.charAt(ix) != pad) break;
	}
	if (ix < end) {
	    ret = source.substring(ix, end);
	}
	status.setIndex(end);
	return ret;
    }
}