001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.math.exception.util;
018
019 import java.text.MessageFormat;
020 import java.util.Locale;
021
022 /**
023 * Class for constructing localized messages.
024 *
025 * @since 2.2
026 * @version $Revision$ $Date$
027 */
028 public class MessageFactory {
029 /**
030 * Class contains only static methods.
031 */
032 private MessageFactory() {}
033
034 /**
035 * Builds a message string by from a pattern and its arguments.
036 *
037 * @param locale Locale in which the message should be translated.
038 * @param pattern Format specifier.
039 * @param arguments Format arguments.
040 * @return a localized message string.
041 */
042 public static String buildMessage(Locale locale,
043 Localizable pattern,
044 Object ... arguments) {
045 return buildMessage(locale, null, pattern, arguments);
046 }
047
048 /**
049 * Builds a message string by from two patterns (specific and general) and
050 * an argument list.
051 *
052 * @param locale Locale in which the message should be translated.
053 * @param specific Format specifier (may be null).
054 * @param general Format specifier (may be null).
055 * @param arguments Format arguments. They will be substituted in
056 * <em>both</em> the {@code general} and {@code specific} format specifiers.
057 * @return a localized message string.
058 */
059 public static String buildMessage(Locale locale,
060 Localizable specific,
061 Localizable general,
062 Object ... arguments) {
063 final StringBuilder sb = new StringBuilder();
064 if (general != null) {
065 final MessageFormat fmt = new MessageFormat(general.getLocalizedString(locale), locale);
066 sb.append(fmt.format(arguments));
067 }
068 if (specific != null) {
069 if (general != null) {
070 sb.append(": ");
071 }
072 final MessageFormat fmt = new MessageFormat(specific.getLocalizedString(locale), locale);
073 sb.append(fmt.format(arguments));
074 }
075
076 return sb.toString();
077 }
078 }