/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.vfs.util;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
* Formats messages.
*
* @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
*/
public class Messages
{
/**
* Map from message code to MessageFormat object for the message.
*/
private static Map messages = new HashMap();
private static ResourceBundle resources;
private Messages()
{
}
/**
* Formats a message.
*
* @param code The message code.
* @return The formatted message.
*/
public static String getString(final String code)
{
return getString(code, new Object[0]);
}
/**
* Formats a message.
*
* @param code The message code.
* @param param The message parameter.
* @return The formatted message.
*/
public static String getString(final String code, final Object param)
{
return getString(code, new Object[]{param});
}
/**
* Formats a message.
*
* @param code The message code.
* @param params The message parameters.
* @return The formatted message.
*/
public static String getString(final String code, final Object[] params)
{
try
{
if (code == null)
{
return null;
}
final MessageFormat msg = findMessage(code);
return msg.format(params);
}
catch (final MissingResourceException mre)
{
return "Unknown message with code \"" + code + "\".";
}
}
/**
* Locates a message by its code.
*/
private static synchronized MessageFormat findMessage(final String code)
throws MissingResourceException
{
// Check if the message is cached
MessageFormat msg = (MessageFormat) messages.get(code);
if (msg != null)
{
return msg;
}
// Locate the message
if (resources == null)
{
resources = ResourceBundle.getBundle("org.apache.commons.vfs.Resources");
}
final String msgText = resources.getString(code);
msg = new MessageFormat(msgText);
messages.put(code, msg);
return msg;
}
}