001// Copyright 2006-2013 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.commons.internal.util;
016
017import java.util.Locale;
018
019import org.apache.tapestry5.commons.MessageFormatter;
020import org.apache.tapestry5.commons.util.ExceptionUtils;
021
022
023public class MessageFormatterImpl implements MessageFormatter
024{
025    private final String format;
026
027    private final Locale locale;
028
029    public MessageFormatterImpl(String format, Locale locale)
030    {
031        this.format = format;
032        this.locale = locale;
033    }
034
035    @Override
036    public String format(Object... args)
037    {
038        for (int i = 0; i < args.length; i++)
039        {
040            Object arg = args[i];
041
042            if (Throwable.class.isInstance(arg))
043            {
044                args[i] = ExceptionUtils.toMessage((Throwable) arg);
045            }
046        }
047
048        // Might be tempting to create a Formatter object and just keep reusing it ... but
049        // Formatters are not threadsafe.
050
051        return String.format(locale, format, args);
052    }
053
054    /**
055     * Returns the underlying format string for this formatter.
056     *
057     * @since 5.4
058     */
059    @Override
060    public String toString()
061    {
062        return format;
063    }
064
065}