ERXOrdinalFormatter.java

package er.extensions.formatters;

import java.text.FieldPosition;
import java.text.ParsePosition;

import com.ibm.icu.text.RuleBasedNumberFormat;
import com.ibm.icu.util.ULocale;



/**
 * Formats numbers into 1st, 2nd, 3rd. etc.  Not localized (English only at present).
 *
 * @author chill
 */
public class ERXOrdinalFormatter extends java.text.Format {
	/**
	 * Do I need to update serialVersionUID?
	 * See section 5.6 <cite>Type Changes Affecting Serialization</cite> on page 51 of the 
	 * <a href="http://java.sun.com/j2se/1.4/pdf/serial-spec.pdf">Java Object Serialization Spec</a>
	 */
	private static final long serialVersionUID = 1L;


	@Override
	public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
		StringBuffer result = new StringBuffer();
		if (obj != null) {
			if ( !(obj instanceof Number)) {
		        throw new RuntimeException("Object of class " + obj.getClass().getCanonicalName() + " passed to ERXOrdinalFormatter");
			}
			
			RuleBasedNumberFormat rbnf = new RuleBasedNumberFormat(ULocale.ENGLISH,RuleBasedNumberFormat.ORDINAL);
			result.append(rbnf.format(obj));		 
		}

		return result;
	}

    /**
     * API conformance.
     */
    @Override
    public Object parseObject(String source, ParsePosition pos)
    {
        throw new RuntimeException("Method not implemented");
    }

}