Mega Code Archive
Utility class to manage localization resources
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/*****************************************************************************
* Java Plug-in Framework (JPF)
* Copyright (C) 2004-2005 Dmitry Olshansky
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
* Utility class to manage localization resources. This class is not for public
* usage but mainly for custom implementations developers to provide them
* uniform access and organization of locale specific data.
* <br>
* Class usage is very simple. Put your locale sensible data into
* <code>Resources.properties</code> files and save them near classes that you
* are going to get localized. For {@link java.util.Locale} to file mapping
* details see {@link ResourceBundle} documentation.
*
* @version $Id$
*/
public final class ResourceManager {
private static final Object FAKE_BUNDLE = new Object();
private static final Map<String, Object> bundles =
Collections.synchronizedMap(new HashMap<String, Object>());
/**
* @param packageName package name, used for
* <code>Resources.properties</code> file look-up
* @param messageKey message key
* @return message for {@link Locale#getDefault() default locale}
*/
public static String getMessage(final String packageName,
final String messageKey) {
return getMessage(packageName, messageKey, Locale.getDefault(), null);
}
/**
* @param packageName package name, used for
* <code>Resources.properties</code> file look-up
* @param messageKey message key
* @param data data for parameter placeholders substitution, may be
* <code>Object</code>, <code>array</code> or
* <code>Collection</code>.
* @return message for {@link Locale#getDefault() default locale}
*/
public static String getMessage(final String packageName,
final String messageKey, final Object data) {
return getMessage(packageName, messageKey, Locale.getDefault(), data);
}
/**
* @param packageName package name, used for
* <code>Resources.properties</code> file look-up
* @param messageKey message key
* @param locale locale to get message for
* @return message for given locale
*/
public static String getMessage(final String packageName,
final String messageKey, final Locale locale) {
return getMessage(packageName, messageKey, locale, null);
}
/**
* @param packageName package name, used for
* <code>Resources.properties</code> file look-up
* @param messageKey message key
* @param locale locale to get message for
* @param data data for parameter placeholders substitution, may be
* <code>Object</code>, <code>array</code> or
* <code>Collection</code>.
* @return message for given locale
*/
public static String getMessage(final String packageName,
final String messageKey, final Locale locale, final Object data) {
Object obj = bundles.get(packageName + '|' + locale);
if (obj == null) {
try {
obj = ResourceBundle.getBundle(packageName + ".Resources", //$NON-NLS-1$
locale);
} catch (MissingResourceException mre) {
obj = FAKE_BUNDLE;
}
bundles.put(packageName + '|' + locale, obj);
}
if (obj == FAKE_BUNDLE) {
return "resource " + packageName + '.' + messageKey //$NON-NLS-1$
+ " not found for locale " + locale; //$NON-NLS-1$
}
try {
String result = ((ResourceBundle) obj).getString(messageKey);
return (data == null) ? result : processParams(result, data);
} catch (MissingResourceException mre) {
return "resource " + packageName + '.' + messageKey //$NON-NLS-1$
+ " not found for locale " + locale; //$NON-NLS-1$
}
}
private static String processParams(final String str, final Object data) {
String result = str;
if ((data != null) && data.getClass().isArray()) {
Object[] params = (Object[])data;
for (int i = 0; i < params.length; i++) {
result = replaceAll(result, "{" + i + "}", "" + params[i]); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
} else if (data instanceof Collection) {
int i = 0;
for (Object object : (Collection) data) {
result = replaceAll(result, "{" + i++ + "}", "" + object); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
} else {
result = replaceAll(result, "{0}", "" + data); //$NON-NLS-1$ //$NON-NLS-2$
}
return result;
}
private static String replaceAll(final String str, final String from,
final String to) {
String result = str;
int p = 0;
while (true) {
p = result.indexOf(from, p);
if (p == -1) {
break;
}
result = result.substring(0, p) + to
+ result.substring(p + from.length());
p += to.length();
}
return result;
}
private ResourceManager() {
// no-op
}
}
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