Examples of com.ibm.icu.text.MessageFormat

com.ibm.icu.text.MessageFormat
ut, with different testArgs output: The disk "MyDisk" contains 0 file(s). output: The disk "MyDisk" contains 1 file(s). output: The disk "MyDisk" contains 1,273 file(s).
For more sophisticated patterns, you can use a ChoiceFormat to get output such as:
```
 MessageFormat form = new MessageFormat("The disk \"{1}\" contains {0}."); double[] filelimits = {0,1,2}; String[] filepart = {"no files","one file","{0,number} files"}; ChoiceFormat fileform = new ChoiceFormat(filelimits, filepart); form.setFormatByArgumentIndex(0, fileform); Object[] testArgs = {new Long(12373), "MyDisk"}; System.out.println(form.format(testArgs)); // output, with different testArgs output: The disk "MyDisk" contains no files. output: The disk "MyDisk" contains one file. output: The disk "MyDisk" contains 1,273 files. 
```
You can either do this programmatically, as in the above example, or by using a pattern (see {@link ChoiceFormat}for more information) as in:
```
 form.applyPattern( "There {0,choice,0#are no files|1#is one file|1<are {0,number,integer} files}."); 
```
Note: As we see above, the string produced by a ChoiceFormat in MessageFormat is treated specially; occurances of '{' are used to indicated subformats, and cause recursion. If you create both a MessageFormat and ChoiceFormat programmatically (instead of using the string patterns), then be careful not to produce a format that recurses on itself, which will cause an infinite loop.
When a single argument is parsed more than once in the string, the last match will be the final result of the parsing. For example,
```
 MessageFormat mf = new MessageFormat("{0,number,#.##}, {0,number,#.#}"); Object[] objs = {new Double(3.1415)}; String result = mf.format( objs ); // result now equals "3.14, 3.1" objs = null; objs = mf.parse(result, new ParsePosition(0)); // objs now equals {new Double(3.1)} 
```
Likewise, parsing with a MessageFormat object using patterns containing multiple occurances of the same argument would return the last match. For example,
```
 MessageFormat mf = new MessageFormat("{0}, {0}, {0}"); String forParsing = "x, y, z"; Object[] objs = mf.parse(forParsing, new ParsePosition(0)); // result now equals {new String("z")} 
```
Synchronization

Message formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally. @see java.util.Locale @see Format @see NumberFormat @see DecimalFormat @see ChoiceFormat @author Mark Davis @stable ICU 3.0


        for (int i = 0; i < 9; ++i) {
            //it_out << "\nPat in:  " << testCases[i]);


            //String buffer;
            MessageFormat form = null;
            try {
                form = new MessageFormat(testCases[i], Locale.US);
            } catch (IllegalArgumentException e1) {
                errln("MessageFormat for " + testCases[i] + " creation failed.");
                continue;
            }
            assertEquals("\"" + testCases[i] + "\".toPattern()", testResultPatterns[i], form.toPattern());


            //it_out << "Pat out: " << form.toPattern(buffer));
            StringBuffer result = new StringBuffer();
            FieldPosition fieldpos = new FieldPosition(0);
            form.format(testArgs, result, fieldpos);
            assertEquals("format", testResultStrings[i], result.toString());


            //it_out << "Result:  " << result);
    //        /* TODO: Look at this test and see if this is still a valid test */
    //        logln("---------------- test parse ----------------");

View Full Code Here

        }
    }


    public void TestSample() // aka sample()
    {
        MessageFormat form = null;
        StringBuffer buffer2 = new StringBuffer();
        try {
            form = new MessageFormat("There are {0} files on {1}");
        } catch (IllegalArgumentException e1) {
            errln("Sample message format creation failed.");
            return;
        }
        Object testArgs1[] = { "abc", "def" };
        FieldPosition fieldpos = new FieldPosition(0);
        assertEquals("format",
                     "There are abc files on def",
                     form.format(testArgs1, buffer2, fieldpos).toString());
    }

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    {
        Object testArgs1[] = {new Integer(0), "MyDisk"};
        Object testArgs2[] = {new Integer(1), "MyDisk"};
        Object testArgs3[] = {new Integer(12), "MyDisk"};


        MessageFormat form = new MessageFormat(
            "The disk \"{1}\" contains {0} file(s).");


        StringBuffer string = new StringBuffer();
        FieldPosition ignore = new FieldPosition(FieldPosition_DONT_CARE);
        form.format(testArgs1, string, ignore);
        assertEquals("format",
                     "The disk \"MyDisk\" contains 0 file(s).",
                     string.toString());


        string.setLength(0);
        form.format(testArgs2, string, ignore);
        assertEquals("format",
                     "The disk \"MyDisk\" contains 1 file(s).",
                     string.toString());


        string.setLength(0);
        form.format(testArgs3, string, ignore);
        assertEquals("format",
                     "The disk \"MyDisk\" contains 12 file(s).",
                     string.toString());
    }

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                     string.toString());
    }


    public void TestMsgFormatChoice()
    {
        MessageFormat form = new MessageFormat("The disk \"{1}\" contains {0}.");
        double filelimits[] = {0,1,2};
        String filepart[] = {"no files","one file","{0,number} files"};
        ChoiceFormat fileform = new ChoiceFormat(filelimits, filepart);
        form.setFormat(1, fileform); // NOT zero, see below


        FieldPosition ignore = new FieldPosition(FieldPosition_DONT_CARE);
        StringBuffer string = new StringBuffer();
        Object testArgs1[] = {new Integer(0), "MyDisk"};
        form.format(testArgs1, string, ignore);
        assertEquals("format#1",
                     "The disk \"MyDisk\" contains no files.",
                     string.toString());


        string.setLength(0);
        Object testArgs2[] = {new Integer(1), "MyDisk"};
        form.format(testArgs2, string, ignore);
        assertEquals("format#2",
                     "The disk \"MyDisk\" contains one file.",
                     string.toString());


        string.setLength(0);
        Object testArgs3[] = {new Integer(1273), "MyDisk"};
        form.format(testArgs3, string, ignore);
        assertEquals("format#3",
                     "The disk \"MyDisk\" contains 1,273 files.",
                     string.toString());
    }

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    //  API Tests
    //---------------------------------


    public void TestClone()
    {
        MessageFormat x = new MessageFormat("There are {0} files on {1}");
        MessageFormat z = new MessageFormat("There are {0} files on {1} created");
        MessageFormat y = null;
        y = (MessageFormat)x.clone();
        if (x.equals(y) &&
            !x.equals(z) &&
            !y.equals(z) )
            logln("First test (operator ==): Passed!");
        else {
            errln("First test (operator ==): Failed!");
        }
        if ((x.equals(y) && y.equals(x)) &&
            (!x.equals(z) && !z.equals(x)) &&
            (!y.equals(z) && !z.equals(y)) )
            logln("Second test (equals): Passed!");
        else {
            errln("Second test (equals): Failed!");
        }

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    }


    public void TestEquals()
    {
        MessageFormat x = new MessageFormat("There are {0} files on {1}");
        MessageFormat y = new MessageFormat("There are {0} files on {1}");
        if (!x.equals(y)) {
            errln("First test (operator ==): Failed!");
        }


    }

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    }


    public void TestNotEquals()
    {
        MessageFormat x = new MessageFormat("There are {0} files on {1}");
        MessageFormat y = new MessageFormat("There are {0} files on {1}");
        y.setLocale(Locale.FRENCH);
        if (x.equals(y)) {
            errln("First test (operator !=): Failed!");
        }
        y = new MessageFormat("There are {0} files on {1}");
        y.applyPattern("There are {0} files on {1} the disk");
        if (x.equals(y)) {
            errln("Second test (operator !=): Failed!");
        }
    }

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    public void TestHashCode()
    {
        ULocale save = ULocale.getDefault();
        ULocale.setDefault(ULocale.US);


        MessageFormat x = new MessageFormat("There are {0} files on {1}");
        MessageFormat z = new MessageFormat("There are {0} files on {1}");
        MessageFormat y = null;
        y = (MessageFormat)x.clone();
        if (x.hashCode() != y.hashCode())
            errln("FAIL: identical objects have different hashcodes");
        if (x.hashCode() != z.hashCode())
            errln("FAIL: identical objects have different hashcodes");


    /* These are not errors

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        String compareStrGer = "At <time> on 08.08.1997, you made a deposit of ";
        compareStrGer += "456,83\u00a0";
        compareStrGer += '\u00a4';
        compareStrGer += ".";


        MessageFormat msg = new MessageFormat(formatStr, Locale.ENGLISH);
        result.setLength(0);
        FieldPosition pos = new FieldPosition(0);
        result = msg.format(
            arguments,
            result,
            pos);
        assertEquals("format", compareStrEng, result.toString());


        msg.setLocale(Locale.ENGLISH);
        assertEquals("getLocale", Locale.ENGLISH, msg.getLocale());


        msg.setLocale(Locale.GERMAN);
        assertEquals("getLocale", Locale.GERMAN, msg.getLocale());


        msg.applyPattern(formatStr);
        result.setLength(0);
        result = msg.format(
            arguments,
            result,
            pos);
        assertEquals("format", compareStrGer, result.toString());


        //Cover getULocale()
        logln("Testing set/get ULocale ...");
        msg.setLocale(ULocale.ENGLISH);
        assertEquals("getULocale", ULocale.ENGLISH, msg.getULocale());


        msg.setLocale(ULocale.GERMAN);
        assertEquals("getULocale", ULocale.GERMAN, msg.getULocale());


        msg.applyPattern(formatStr);
        result.setLength(0);
        result = msg.format(
            arguments,
            result,
            pos);
        assertEquals("format", compareStrGer, result.toString());
    }

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        //String formatStr = "At {1,time} on {1,date}, you made a {2} of {0,number,currency}.";
        String formatStr = "On {0,date}, it began.";
        String compareStr = "On Aug 8, 1997, it began.";


        MessageFormat msg = new MessageFormat(formatStr);
        FieldPosition fp = new FieldPosition(0);


        try {
            msg.format(new Date(871068000000L),
                       result,
                       fp);
            errln("*** MSG format without expected error code.");
        } catch (Exception e1) {
        }


        result.setLength(0);
        result = msg.format(
            ft_arr,
            result,
            fp);
        assertEquals("format", compareStr, result.toString());
    }

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Examples of com.ibm.icu.text.MessageFormat

Synchronization

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