</function>

  <function>
    <description>
      Returns formatted number from a given value.
    </description>
    <name>formatNumber</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String formatNumber(long, java.lang.String)</function-signature>
    <example>
      ${fe:formatNumber(doc.content_length, "###,###")}
    </example>
  </function>

     *
     * @param value the number to format
     * @param pattern the number format pattern
     * @return formatted number string
     */
    public static String formatNumber(final long value, final String pattern) {
        final DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(getUserLocale());
        df.applyPattern(pattern);
        return df.format(value);
    }

public class FessFunctionsTest extends UnitFessTestCase {
    @Test
    public void test_formatNumber() {
        assertEquals("0", FessFunctions.formatNumber(0, "###,###"));
        assertEquals("1,000", FessFunctions.formatNumber(1000, "###,###"));
        assertEquals("1,000,000", FessFunctions.formatNumber(1000000, "###,###"));
    }

    @Test
    public void test_formatFileSize() {
        assertEquals("0", FessFunctions.formatFileSize(0));