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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.certsrv.base;
import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.reflect.*;
/**
* Factors out common function of formatting internatinalized
* messages taking arguments and using java.util.ResourceBundle
* and java.text.MessageFormat mechanism.
* <P>
*
* @version $Revision$, $Date$
* @see java.text.MessageFormat
* @see java.util.ResourceBundle
*/
public class MessageFormatter {
private static final Class[] toStringSignature = { Locale.class };
/**
* Retrieves the localized string.
*
* @param locale end user locale
* @param resourceBundleBaseName resource bundle class name
* @param formatString format string
* @return localized string
*/
public static String getLocalizedString(
Locale locale, String resourceBundleBaseName,
String formatString) {
return getLocalizedString(locale, resourceBundleBaseName,
formatString, null);
}
/**
* Retrieves the localized string.
*
* @param locale end user locale
* @param resourceBundleBaseName resource bundle class name
* @param formatString format string
* @param params parameters to be substituted
* @return localized string
*/
public static String getLocalizedString(
Locale locale, String resourceBundleBaseName,
String formatString, Object params) {
Object o[] = new Object[1];
o[0] = params;
return getLocalizedString(locale, resourceBundleBaseName,
formatString, o);
}
/**
* Retrieves the localized string.
*
* @param locale end user locale
* @param resourceBundleBaseName resource bundle class name
* @param formatString format string
* @param params parameters to be substituted
* @return localized string
*/
public static String getLocalizedString(
Locale locale, String resourceBundleBaseName,
String formatString, Object[] params) {
String localizedFormat = null;
try {
try {
// if you are worried about the efficiency of the
// following line, dont worry. ResourceBundle has
// an internal cache. So resource bundle wont be
// instantiated everytime you call toString().
localizedFormat = ResourceBundle.getBundle(
resourceBundleBaseName, locale).getString(formatString);
} catch (MissingResourceException e) {
return formatString;
}
Object[] localizedParams = params;
Object[] localeArg = null;
if (params != null) {
for (int i = 0; i < params.length; ++i) {
if (!(params[i] instanceof String) ||
!(params[i] instanceof Date) ||
!(params[i] instanceof Number)) {
if (localizedParams == params) {
// only done once
// NB if the following variant of cloning code is used
// localizedParams = (Object [])mParams.clone();
// it causes ArrayStoreException in
// localizedParams[i] = params[i].toString();
// below
localizedParams = new Object[params.length];
System.arraycopy(params, 0, localizedParams, 0,
params.length);
}
try {
Method toStringMethod = params[i].getClass().getMethod(
"toString", toStringSignature);
if (localeArg == null) {
// only done once
localeArg = new Object[] { locale };
}
localizedParams[i] = toStringMethod.invoke(
params[i], localeArg);
} catch (Exception e) {
// no method for localization, fall back
localizedParams[i] = params[i].toString();
}
}
}
}
try {
// XXX - runtime exception may be raised by the following function
MessageFormat format = new MessageFormat(localizedFormat);
return format.format(localizedParams);
} catch (IllegalArgumentException e) {
// XXX - for now, we just print the unformatted message
// if the exception is raised
return localizedFormat;
}
} catch (Exception e) {
return localizedFormat;
}
}
}
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