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

            // form the replacement string
            MessageFormat linkFormat = feelinLucky ? getLuckyLinkFormat() : getLinkFormat();
            StringBuffer replacement = new StringBuffer(128);
            args[2] = linkText;
            args[3] = encodedSearchText;
            linkFormat.format(args, replacement, new FieldPosition(0));


            // append replacement
            m.appendReplacement(result, replacement.toString());
        }
        m.appendTail(result);

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     */
    protected String generateLink(MessageFormat fmt, String site, String tag)
    {
        // Allocate initial capacity of buffer of approximately the right length.
        StringBuffer sb = new StringBuffer(site.length() + tag.length() + getLinkFormatString().length());
        fmt.format(new Object[]{site, urlEncode(tag), tag}, sb, new FieldPosition(0));
        return sb.toString();
    }

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        // may be exchanged while we are trying to use it
        MessageFormat myFormat = format;
        synchronized (myFormat) {
            myFormat.format(new Object[] { new Date(), marker,
                Thread.currentThread().getName(), name, level.toString(), msg,
                fqcn }, buffer, new FieldPosition(0));
        }
    }

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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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    decimalFormat.setRoundingMode(RoundingMode.UNNECESSARY);


    try {
      // when rounding is needed, but RoundingMode is set to RoundingMode.UNNECESSARY, throw ArithmeticException
      decimalFormat
          .format(11.5, new StringBuffer(), new FieldPosition(0));
      fail("ArithmeticException expected");
    } catch (ArithmeticException e) {
      // expected
    }
  }

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    decimalFormat.setRoundingMode(RoundingMode.UNNECESSARY);
    try {
      // when rounding is needed, but RoundingMode is set to RoundingMode.UNNECESSARY, throw ArithmeticException
      decimalFormat.format(99999, new StringBuffer(),
          new FieldPosition(0));
      fail("ArithmeticException expected");
    } catch (ArithmeticException e) {
      // expected
    }
  }

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    StringBuffer formattedAmount = new StringBuffer();


    DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.US);
    DecimalFormat format = new DecimalFormat("0.00", symbols);
    format.format(amount, formattedAmount, new FieldPosition(0));


    String xmlMessage = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
        + "<charge-order xmlns=\"" + NAMESPACE
        + "\" google-order-number=\"" + orderNumber + "\">\n"
        + " <amount currency=\"USD\">" + formattedAmount.toString()

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    }


    StringBuffer formattedAmount = new StringBuffer();
    DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.US);
    DecimalFormat format = new DecimalFormat("0.00", symbols);
    format.format(amount, formattedAmount, new FieldPosition(0));


    String xmlMessage = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
        + "<refund-order xmlns=\"" + NAMESPACE
        + "\" google-order-number=\"" + orderNumber + "\">\n"
        + " <amount currency=\"USD\">" + formattedAmount.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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