Examples of java.text.FieldPosition

java.text.FieldPosition
FieldPosition is a simple class used by Format and its subclasses to identify fields in formatted output. Fields can be identified in two ways:
- By an integer constant, whose names typically end with _FIELD. The constants are defined in the various subclasses of Format.
- By a Format.Field constant, see ERA_FIELD and its friends in DateFormat for an example.
FieldPosition keeps track of the position of the field within the formatted output with two indices: the index of the first character of the field and the index of the last character of the field.
One version of the format method in the various Format classes requires a FieldPosition object as an argument. You use this format method to perform partial formatting or to get information about the formatted output (such as the position of a field).
If you are interested in the positions of all attributes in the formatted string use the Format method formatToCharacterIterator. @version 1.22 11/17/05 @author Mark Davis @see java.text.Format

   */
  public static String format (Date d) {
    StringBuffer iso8601 = new StringBuffer();
    SimpleDateFormat sdf = new SimpleDateFormat(masks[2]);
    sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
    sdf.format(d, iso8601, new FieldPosition(0));
    return iso8601.toString();
  }

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      Locale loc = Locale.US;
      Locale.setDefault (loc);


      StringBuffer buf = new StringBuffer ();
      DecimalFormat df = new DecimalFormat ("0.##");
      FieldPosition intPos = new FieldPosition (NumberFormat.INTEGER_FIELD);
      FieldPosition fracPos = new FieldPosition (NumberFormat.FRACTION_FIELD);


      harness.check (format (df, -1234.56, intPos, buf), "-1234.56");
      harness.check (intPos.getBeginIndex (), 1);
      harness.check (intPos.getEndIndex (), 5);


      harness.check (format (df, -1234.56, fracPos, buf), "-1234.56");
      harness.check (fracPos.getBeginIndex (), 6);
      harness.check (fracPos.getEndIndex (), 8);
    }

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    }
  }
  public String getNumberAsString(Object o){
    if (enableLocalized){
      return formatNumber.format(o, new StringBuffer(),
                    new FieldPosition(0)).toString();
    }
    else {
      return o.toString();
    }
  }

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     */
    private void readObject(final ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        in.defaultReadObject();
        dummy = new FieldPosition(0);
    }

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   * @return the formatted color string
   */
  public final String format(
    Color color)
  {
    return format(color, new StringBuffer(),new FieldPosition(0)).toString();
  }

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    private void writeScientific(double value, StringBuffer output,
            Set<StringMod> mods) {


        StringBuffer result = new StringBuffer();
        FieldPosition fractionPos = new FieldPosition(
                DecimalFormat.FRACTION_FIELD);
        decimalFmt.format(value, result, fractionPos);
        writeInteger(result, output, integerSpecials, mods, integerCommas);
        writeFractional(result, output);


        /*
        * Exponent sign handling is complex.
        *
        * In DecimalFormat, you never put the sign in the format, and the sign only
        * comes out of the format if it is negative.
        *
        * In Excel, you always say whether to always show the sign ("e+") or only
        * show negative signs ("e-").
        *
        * Also in Excel, where you put the sign in the format is NOT where it comes
        * out in the result.  In the format, the sign goes with the "e"; in the
        * output it goes with the exponent value.  That is, if you say "#e-|#" you
        * get "1e|-5", not "1e-|5". This makes sense I suppose, but it complicates
        * things.
        *
        * Finally, everything else in this formatting code assumes that the base of
        * the result is the original format, and that starting from that situation,
        * the indexes of the original special characters can be used to place the new
        * characters.  As just described, this is not true for the exponent's sign.
        * <p/>
        * So here is how we handle it:
        *
        * (1) When parsing the format, remove the sign from after the 'e' and put it
        * before the first digit of the exponent (where it will be shown).
        *
        * (2) Determine the result's sign.
        *
        * (3) If it's missing, put the sign into the output to keep the result
        * lined up with the output. (In the result, "after the 'e'" and "before the
        * first digit" are the same because the result has no extra chars to be in
        * the way.)
        *
        * (4) In the output, remove the sign if it should not be shown ("e-" was used
        * and the sign is negative) or set it to the correct value.
        */


        // (2) Determine the result's sign.
        int ePos = fractionPos.getEndIndex();
        int signPos = ePos + 1;
        char expSignRes = result.charAt(signPos);
        if (expSignRes != '-') {
            // not a sign, so it's a digit, and therefore a positive exponent
            expSignRes = '+';

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     * Tests the {@link RangeFormat#format(Object, StringBuffer, FieldPosition)} method with numbers.
     */
    @Test
    public void testFormatNumbers() {
        format = new RangeFormat(Locale.CANADA);
        minPos = new FieldPosition(RangeFormat.Field.MIN_VALUE);
        maxPos = new FieldPosition(RangeFormat.Field.MAX_VALUE);


        // Closed range
        assertEquals("[-10 … 20]", format(NumberRange.create(-10, true, 20, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   4, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 7, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   9, maxPos.getEndIndex());


        // Open range
        assertEquals("(-3 … 4)", format(NumberRange.create(-3, false, 4, false)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   7, maxPos.getEndIndex());


        // Half-open range
        assertEquals("[2 … 8)", format(NumberRange.create(2, true, 8, false)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   2, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 5, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   6, maxPos.getEndIndex());


        // Half-open range
        assertEquals("(40 … 90]", format(NumberRange.create(40, false, 90, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   8, maxPos.getEndIndex());


        // Single value
        assertEquals("{300}", format(NumberRange.create(300, true, 300, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   4, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 1, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   4, maxPos.getEndIndex());


        // Empty range
        assertEquals("{}", format(NumberRange.create(300, true, 300, false)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   1, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 1, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   1, maxPos.getEndIndex());


        // Negative infinity
        assertEquals("(-∞ … 30]", format(NumberRange.create(Double.NEGATIVE_INFINITY, true, 30, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   8, maxPos.getEndIndex());


        // Positive infinity
        assertEquals("[50 … ∞)", format(NumberRange.create(50, true, Double.POSITIVE_INFINITY, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   7, maxPos.getEndIndex());


        // Positive infinities
        assertEquals("(-∞ … ∞)", format(NumberRange.create(Double.NEGATIVE_INFINITY, true, Double.POSITIVE_INFINITY, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   7, maxPos.getEndIndex());


        // Positive infinity with integers
        assertEquals("[50 … ∞)", format(new NumberRange<Integer>(Integer.class, 50, true, null, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   7, maxPos.getEndIndex());


        // Negative infinity with integers
        assertEquals("(-∞ … 40]", format(new NumberRange<Integer>(Integer.class, null, true, 40, true)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   3, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 6, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   8, maxPos.getEndIndex());


        // Measurement
        assertEquals("[-10 … 20] m", format(MeasurementRange.create(-10, true, 20, true, SI.METRE)));
        assertEquals("minPos.beginIndex", 1, minPos.getBeginIndex());
        assertEquals("minPos.endIndex",   4, minPos.getEndIndex());
        assertEquals("maxPos.beginIndex", 7, maxPos.getBeginIndex());
        assertEquals("maxPos.endIndex",   9, maxPos.getEndIndex());


        maxPos = new FieldPosition(RangeFormat.Field.UNIT);
        assertEquals("[-1 … 2] km", format(MeasurementRange.create(-1, true, 2, true, SI.KILOMETRE)));
        assertEquals("unitPos.beginIndex", 9, maxPos.getBeginIndex());
        assertEquals("unitPos.endIndex",  11, maxPos.getEndIndex());
    }

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     * using the alternate format.
     */
    @Test
    public void testAlternateFormat() {
        format = new RangeFormat(Locale.CANADA);
        minPos = new FieldPosition(RangeFormat.Field.MIN_VALUE);
        maxPos = new FieldPosition(RangeFormat.Field.MAX_VALUE);
        format.setAlternateForm(true);


        assertEquals("[-10 … 20]", format(NumberRange.create(-10, true, 20, true)));
        assertEquals("]-3 … 4[",   format(NumberRange.create( -3, false, 4, false)));
        assertEquals("[2 … 8[",    format(NumberRange.create(  2, true,  8, false)));

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     * Tests the {@link RangeFormat#formatToCharacterIterator(Object)} method with dates.
     */
    @Test
    public void testFormatDatesToCharacterIterator() {
        format   = new RangeFormat(Locale.FRANCE, TimeZone.getTimeZone("UTC"));
        minPos   = new FieldPosition(RangeFormat.Field.MIN_VALUE);
        maxPos   = new FieldPosition(RangeFormat.Field.MAX_VALUE);
        parsePos = new ParsePosition(0);


        final long HOUR = 60L * 60 * 1000;
        final long DAY  = 24L * HOUR;
        final long YEAR = round(365.25 * DAY);

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         * programmatically by a call to 'setTimeFormat(…)', or in logging.properties
         * file with the "org.apache.sis.util.logging.MonolineFormatter.time" property.
         */
        if (timeFormat != null) {
            Date time = new Date(Math.max(0, record.getMillis() - startMillis));
            timeFormat.format(time, buffer, new FieldPosition(0));
            buffer.append(' ');
        }
        /*
         * Appends the level (e.g. "FINE"). We do not provide the option to turn level off for now.
         * This level will be formatted with a colorized background if ANSI escape sequences are enabled.

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