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

        assertTrue("Wrong choice format", formats[3].equals(new ChoiceFormat(
                "0.0#low|1.0#high")));
    assertNull("Wrong string format", formats[4]);


        Date date = new Date();
        FieldPosition pos = new FieldPosition(-1);
        StringBuffer buffer = new StringBuffer();
        format.format(new Object[] { "123", new Double(1.6), new Double(7.2),
                date, date }, buffer, pos);
        String result = buffer.toString();
        buffer.setLength(0);

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        // java.text.MessageFormat.format(java.lang.Object [],
        // java.lang.StringBuffer, java.text.FieldPosition)
        MessageFormat format = new MessageFormat("{1,number,integer}");
        StringBuffer buffer = new StringBuffer();
        format.format(new Object[] { "0", new Double(53.863) }, buffer,
                new FieldPosition(0));
    assertEquals("Wrong result", "54", buffer.toString());
        format
                .applyPattern("{0,choice,0#zero|1#one '{1,choice,2#two {2,time}}'}");
        Date date = new Date();
        String expected = "one two "

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        DecimalFormat form = (DecimalFormat) nform;


        // If Object(including null) is not of type Number,
        // IllegalArgumentException will be thrown out
        try {
            form.format(new Object(), new StringBuffer(), new FieldPosition(0));
            fail("Should throw IAE");
        } catch (IllegalArgumentException e) {
            // expected
        }
        try {
            form.format(null, new StringBuffer(), new FieldPosition(0));
            fail("Should throw IAE");
        } catch (IllegalArgumentException e) {
            // expected
        }


        // When StringBuffer == null || FieldPosition == null
        // NullPointerException will be thrown out.
        try {
            form.format(new Double(1.9), null, new FieldPosition(0));
            fail("Should throw NPE");
        } catch (NullPointerException e) {
            // expected
        }


        try {
            form.format(new Double(1.3), new StringBuffer(), null);
            fail("Should throw NPE");
        } catch (NullPointerException e) {
            // expected
        }


        try {
            form.format(new Double(1.4), null, null);
            fail("Should throw NPE");
        } catch (NullPointerException e) {
            // expected
        }


        try {
            form.format(new Object(), null, null);
            fail("Should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // expected
        }


        FieldPosition pos;
        StringBuffer out;
        DecimalFormat format = (DecimalFormat) NumberFormat
                .getInstance(Locale.US);


        // format maxLong
        pos = new FieldPosition(0);
        out = format.format(new Long(Long.MAX_VALUE), new StringBuffer(), pos);
        assertTrue("Wrong result L1: " + out, out.toString().equals(
                "9,223,372,036,854,775,807"));


        // format minLong
        pos = new FieldPosition(0);
        out = format.format(new Long(Long.MIN_VALUE), new StringBuffer(), pos);
        assertTrue("Wrong result L2: " + out, out.toString().equals(
                "-9,223,372,036,854,775,808"));


        // format maxLong of type BigInteger
        pos = new FieldPosition(0);
        out = format.format(new java.math.BigInteger(String
                .valueOf(Long.MAX_VALUE)), new StringBuffer(), pos);
        assertTrue("Wrong result BI1: " + out, out.toString().equals(
                "9,223,372,036,854,775,807"));


        // format minLong of type BigInteger
        pos = new FieldPosition(0);
        out = format.format(new java.math.BigInteger(String
                .valueOf(Long.MIN_VALUE)), new StringBuffer(), pos);
        assertTrue("Wrong result BI2: " + out, out.toString().equals(
                "-9,223,372,036,854,775,808"));


        // format maxLong + 1
        java.math.BigInteger big;
        pos = new FieldPosition(0);
        big = new java.math.BigInteger(String.valueOf(Long.MAX_VALUE))
                .add(new java.math.BigInteger("1"));
        out = format.format(big, new StringBuffer(), pos);
        assertTrue("Wrong result BI3: " + out, out.toString().equals(
                "9,223,372,036,854,775,808"));


        // format minLong - 1
        pos = new FieldPosition(0);
        big = new java.math.BigInteger(String.valueOf(Long.MIN_VALUE))
                .add(new java.math.BigInteger("-1"));
        out = format.format(big, new StringBuffer(), pos);
        assertTrue("Wrong result BI4: " + out, out.toString().equals(
                "-9,223,372,036,854,775,809"));


        // format big decimal
        pos = new FieldPosition(0);
        out = format.format(new java.math.BigDecimal("51.348"),
                new StringBuffer(), pos);
        assertTrue("Wrong result BD1: " + out, out.toString().equals("51.348"));


        // format big decimal
        pos = new FieldPosition(0);
        out = format.format(new java.math.BigDecimal("51"), new StringBuffer(),
                pos);
        assertTrue("Wrong result BD2: " + out, out.toString().equals("51"));


        // format big decimal Double.MAX_VALUE * 2
        java.math.BigDecimal bigDecimal;
        pos = new FieldPosition(0);
        final String doubleMax2 = "359,538,626,972,463,141,629,054,847,463,408,"
                + "713,596,141,135,051,689,993,197,834,953,606,314,521,560,057,077,"
                + "521,179,117,265,533,756,343,080,917,907,028,764,928,468,642,653,"
                + "778,928,365,536,935,093,407,075,033,972,099,821,153,102,564,152,"
                + "490,980,180,778,657,888,151,737,016,910,267,884,609,166,473,806,"
                + "445,896,331,617,118,664,246,696,549,595,652,408,289,446,337,476,"
                + "354,361,838,599,762,500,808,052,368,249,716,736";
        bigDecimal = new BigDecimal(Double.MAX_VALUE).add(new BigDecimal(
                Double.MAX_VALUE));
        out = format.format(bigDecimal, new StringBuffer(), pos);
        assertTrue("Wrong result BDmax2: " + out, out.toString().equals(
                doubleMax2));


        // format big decimal Double.MIN_VALUE + Double.MIN_VALUE
        // and Double.MIN_VALUE - Double.MIN_VALUE
        pos = new FieldPosition(0);


        bigDecimal = new BigDecimal(Double.MIN_VALUE).add(new BigDecimal(
                Double.MIN_VALUE));
        out = format.format(bigDecimal, new StringBuffer(), pos);

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    public void test_setGroupingUse() {
        DecimalFormat format = new DecimalFormat();
        StringBuffer buf = new StringBuffer();
        format.setGroupingUsed(false);
        format.format(new Long(1970), buf, new FieldPosition(0));
        assertEquals("1970", buf.toString());
        assertFalse(format.isGroupingUsed());
    }

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        assertTrue("Tests failed", !test.testsFailed());


        // Test invalid args to format.
        SimpleDateFormat dateFormat = new SimpleDateFormat();
        try {
            dateFormat.format(null, new StringBuffer(), new FieldPosition(1));
            fail("Expected test to throw NPE.");
        } catch (NullPointerException ex) {
            // expected
        } catch (Throwable ex) {
            fail("Expected test to throw NPE, not " + ex.getClass().getName());

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        }


        public void test(String pattern, Calendar cal, String expected,
                int field) {
            StringBuffer buffer = new StringBuffer();
            FieldPosition position = new FieldPosition(field);
            format.applyPattern(pattern);
            format.format(cal.getTime(), buffer, position);
            String result = buffer.toString();
            if (!System.getProperty("java.vendor", "None").substring(0, 3)
                    .equals("Sun")) {
                assertTrue("Wrong format: \"" + pattern + "\" expected: "
                        + expected + " result: " + result, result
                        .equals(expected));
                assertTrue("Wrong begin position: " + pattern + " expected: "
                        + expected + " field: " + field, position
                        .getBeginIndex() == 1);
                assertTrue("Wrong end position: " + pattern + " expected: "
                        + expected + " field: " + field,
                        position.getEndIndex() == result.length());
            } else {
                // Print the failure but don't use assert as this
                // will stop subsequent tests from running
                if (!result.equals(expected)) {
                    System.out

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            GregorianCalendar aCalendar = new GregorianCalendar();
            StringBuffer aBuf = new StringBuffer();
            
            Locale aLocale = new Locale("en","US");
            SimpleDateFormat aFormat = new SimpleDateFormat(_sFormat, aLocale);
            aBuf = aFormat.format(aCalendar.getTime(), aBuf, new FieldPosition(0) );
            // DebugHelper.writeInfo("Date: " + aBuf.toString());
            return aBuf.toString();
        }

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      if ((2 < formatting.length())
        && (formatting.charAt(1) == '.')
        && Character.isDigit(formatting.charAt(2))) {
        numberFormat.setMaximumFractionDigits(
          Integer.parseInt(formatting.charAt(2) + ""));
        numberFormat.format(number, outputTo, new FieldPosition(0));
        return 3;
      }
      numberFormat.format(number, outputTo, new FieldPosition(0));
      return 1;
    } else if (
      (0 < formatting.length()) && (formatting.charAt(0) == '.')) {
      if ((1 < formatting.length())
        && Character.isDigit(formatting.charAt(1))) {
        numberFormat.setMaximumFractionDigits(
          Integer.parseInt(formatting.charAt(1) + ""));
        numberFormat.format(number, outputTo, new FieldPosition(0));
        return 2;
      }
    }
    numberFormat.format(number, outputTo, new FieldPosition(0));
    return 1;
  }

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                && Character.isDigit(formatting.charAt(0))) {
            numberFormat.setMinimumIntegerDigits(Integer.parseInt(formatting.charAt(0) + ""));
            if ((2 < formatting.length()) && (formatting.charAt(1) == '.')
                    && Character.isDigit(formatting.charAt(2))) {
                numberFormat.setMaximumFractionDigits(Integer.parseInt(formatting.charAt(2) + ""));
                numberFormat.format(number, outputTo, new FieldPosition(0));
                return 3;
            }
            numberFormat.format(number, outputTo, new FieldPosition(0));
            return 1;
        } else if ((0 < formatting.length()) && (formatting.charAt(0) == '.')) {
            if ((1 < formatting.length())
                    && Character.isDigit(formatting.charAt(1))) {
                numberFormat.setMaximumFractionDigits(Integer.parseInt(formatting.charAt(1) + ""));
                numberFormat.format(number, outputTo, new FieldPosition(0));
                return 2;
            }
        }
        numberFormat.format(number, outputTo, new FieldPosition(0));
        return 1;
    }

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            GregorianCalendar aCalendar = new GregorianCalendar();
            StringBuffer aBuf = new StringBuffer();
            
            Locale aLocale = new Locale("en","US");
            SimpleDateFormat aFormat = new SimpleDateFormat(_sFormat, aLocale);
            aBuf = aFormat.format(aCalendar.getTime(), aBuf, new FieldPosition(0) );
            // DebugHelper.writeInfo("Date: " + aBuf.toString());
            return aBuf.toString();
        }

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