Example usage for java.text MessageFormat getFormatsByArgumentIndex

Introduction

In this page you can find the example usage for java.text MessageFormat getFormatsByArgumentIndex.

Prototype

public Format[] getFormatsByArgumentIndex() 

Source Link

Document

Gets the formats used for the values passed into format methods or returned from parse methods.

Usage

From source file:I18N.java

/**
 * Given a message and parameters, resolve all message's parameter
 *  placeholders with the parameter value. The firstParam can change which
 *  parameter relates to {0} placeholder in the message, and all increment
 *  from this index. If any of the parameters also have placeholders, this
 *  recursively calls itself to fill their placeholders, setting the
 *  firstParam to the index following all parameters that are used by the
 *  current message so params must be in the order p0..pN, p00..p0N..pMN,
 *  p000..p00N..p0MN..pLMN... where each additional index is for nested
 *  placeholders (ones in params) and assumes every message/param contains
 *  N M L placeholders; any that don't contain placeholders can have their
 *  pXXX.. taken out, so long as the order of remaining params don't change
 * @param message Message to format/*ww  w  . j  av a 2 s. c o m*/
 * @param firstParam Index of parameter that relates to {0} placeholder,
 *  all parameters following this one relate to incrementing placeholders
 * @param params The parameters used to fill the placeholders
 * @return Message with all placeholders filled with relative parameters
 */
private static String formatMessage(String message, int firstParam, Object[] params) {

    // Only need to do any formatting if there are parameters to do the
    //  formatting with. If there are none, the message input is returned
    //  unmodified
    if (params != null && firstParam < params.length) {
        MessageFormat parser;
        Locale locale = Locale.getDefault();
        Format[] formats;

        // Set up
        parser = new MessageFormat("");
        parser.setLocale(locale);
        parser.applyPattern(message);
        // Used only to count how many parameters are needed by this message
        formats = parser.getFormatsByArgumentIndex();

        // Recursively format the parameters used by this message
        for (int paramIndex = 0; paramIndex < formats.length; paramIndex++)
            if (params[firstParam + paramIndex] instanceof String)
                params[firstParam + paramIndex] = formatMessage(params[firstParam + paramIndex].toString(),
                        firstParam + formats.length, params);

        // Format the message using the formatted parameters
        message = parser.format(getParams(params, firstParam, firstParam + formats.length));

    }

    return message;

}

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