messageresources.java

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     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param args An array of replacement parameters for placeholders
     */
    public String getMessage(Locale locale, String key, Object args[]) {

        // Cache MessageFormat instances as they are accessed
        if (locale == null) {
            locale = defaultLocale;
        }

        MessageFormat format = null;
        String formatKey = messageKey(locale, key);

        synchronized (formats) {
            format = (MessageFormat) formats.get(formatKey);
            if (format == null) {
                String formatString = getMessage(locale, key);

                if (formatString == null) {
                    return returnNull ? null : ("???" + formatKey + "???");
                }

                format = new MessageFormat(escape(formatString));
                format.setLocale(locale);
                formats.put(formatKey, format);
            }

        }
        String a = format.format(args);
        return format.format(args);
    }

    /**
     * Returns a text message after parametric replacement of the specified
     * parameter placeholders.  A null string result will never be returned
     * by this method.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param arg0 The replacement for placeholder {0} in the message
     */
    public String getMessage(Locale locale, String key, Object arg0) {
        return this.getMessage(locale, key, new Object[] { arg0 });
    }

    /**
     * Returns a text message after parametric replacement of the specified
     * parameter placeholders.  A null string result will never be returned
     * by this method.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param arg0 The replacement for placeholder {0} in the message
     * @param arg1 The replacement for placeholder {1} in the message
     */
    public String getMessage(Locale locale, String key, Object arg0, Object arg1) {
        return this.getMessage(locale, key, new Object[] { arg0, arg1 });
    }

    /**
     * Returns a text message after parametric replacement of the specified
     * parameter placeholders.  A null string result will never be returned
     * by this method.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param arg0 The replacement for placeholder {0} in the message
     * @param arg1 The replacement for placeholder {1} in the message
     * @param arg2 The replacement for placeholder {2} in the message
     */
    public String getMessage(
        Locale locale,
        String key,
        Object arg0,
        Object arg1,
        Object arg2) {

        return this.getMessage(locale, key, new Object[] { arg0, arg1, arg2 });
    }

    /**
     * Returns a text message after parametric replacement of the specified
     * parameter placeholders.  A null string result will never be returned
     * by this method.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param arg0 The replacement for placeholder {0} in the message
     * @param arg1 The replacement for placeholder {1} in the message
     * @param arg2 The replacement for placeholder {2} in the message
     * @param arg3 The replacement for placeholder {3} in the message
     */
    public String getMessage(
        Locale locale,
        String key,
        Object arg0,
        Object arg1,
        Object arg2,
        Object arg3) {

        return this.getMessage(locale, key, new Object[] { arg0, arg1, arg2, arg3 });
    }

    /**
     * Returns a text message after parametric replacement of the specified
     * parameter placeholders.  A null string result will never be returned
     * by this method.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     * @param arg0 The replacement for placeholder {0} in the message
     * @param arg1 The replacement for placeholder {1} in the message
     * @param arg2 The replacement for placeholder {2} in the message
     * @param arg3 The replacement for placeholder {3} in the message
     * @param arg4 The replacement for placeholder {4} in the message
     */
    public String getMessage(
        Locale locale,
        String key,
        Object arg0,
        Object arg1,
        Object arg2,
        Object arg3,
        Object arg4) {

        return this.getMessage(locale, key, new Object[] { arg0, arg1, arg2, arg3, arg4 });
    }

    /**
     * Return <code>true</code> if there is a defined message for the specified
     * key in the system default locale.
     *
     * @param key The message key to look up
     */
    public boolean isPresent(String key) {

        return this.isPresent(null, key);

    }

    /**
     * Return <code>true</code> if there is a defined message for the specified
     * key in the specified Locale.
     *
     * @param locale The requested message Locale, or <code>null</code>
     *  for the system default Locale
     * @param key The message key to look up
     */
    public boolean isPresent(Locale locale, String key) {

        String message = getMessage(locale, key);

        if (message == null) {
            return false;

        } else if (message.startsWith("???") && message.endsWith("???")) {
            return false; // FIXME - Only valid for default implementation

        } else {
            return true;
        }

    }

    // ------------------------------------------------------ Protected Methods

    /**
     * Escape any single quote characters that are included in the specified
     * message string.
     *
     * @param string The string to be escaped
     */
    protected String escape(String string) {

        if ((string == null) || (string.indexOf('\'') < 0)) {
            return string;
        }

        int n = string.length();
        StringBuffer sb = new StringBuffer(n);

        for (int i = 0; i < n; i++) {
            char ch = string.charAt(i);

            if (ch == '\'') {
                sb.append('\'');
            }

            sb.append(ch);
        }

        return sb.toString();

    }

    /**
     * Compute and return a key to be used in caching information by a Locale.
     * <strong>NOTE</strong> - The locale key for the default Locale in our
     * environment is a zero length String.
     *
     * @param locale The locale for which a key is desired
     */
    protected String localeKey(Locale locale) {
        return (locale == null) ? "" : locale.toString();
    }

    /**
     * Compute and return a key to be used in caching information
     * by Locale and message key.
     *
     * @param locale The Locale for which this format key is calculated
     * @param key The message key for which this format key is calculated
     */
    protected String messageKey(Locale locale, String key) {

        return (localeKey(locale) + "." + key);

    }

    /**
     * Compute and return a key to be used in caching information
     * by locale key and message key.
     *
     * @param localeKey The locale key for which this cache key is calculated
     * @param key The message key for which this cache key is calculated
     */
    protected String messageKey(String localeKey, String key) {

        return (localeKey + "." + key);

    }

    // --------------------------------------------------------- Static Methods

    /**
     * The default MessageResourcesFactory used to create MessageResources
     * instances.
     */
    protected static MessageResourcesFactory defaultFactory = null;

    /**
     * Create and return an instance of <code>MessageResources</code> for the
     * created by the default <code>MessageResourcesFactory</code>.
     *
     * @param config Configuration parameter for this message bundle.
     */
    public synchronized static MessageResources getMessageResources(String config) {

        if (defaultFactory == null) {
            defaultFactory = MessageResourcesFactory.createFactory();
        }

        return defaultFactory.createResources(config);
    }

    /**
     * Log a message to the Writer that has been configured for our use.
     *
     * @param message The message to be logged
     */
    public void log(String message) {
        log.debug(message);
    }

    /**
     * Log a message and exception to the Writer that has been configured
     * for our use.
     *
     * @param message The message to be logged
     * @param throwable The exception to be logged
     */
    public void log(String message, Throwable throwable) {
        log.debug(message, throwable);
    }

}