1 files changed, 78 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math/exception/util/MessageFactory.java b/src/main/java/org/apache/commons/math/exception/util/MessageFactory.java
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+++ b/src/main/java/org/apache/commons/math/exception/util/MessageFactory.java
@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.math.exception.util;
+
+import java.text.MessageFormat;
+import java.util.Locale;
+
+/**
+ * Class for constructing localized messages.
+ *
+ * @since 2.2
+ * @version $Revision$ $Date$
+ */
+public class MessageFactory {
+    /**
+     * Class contains only static methods.
+     */
+    private MessageFactory() {}
+
+    /**
+     * Builds a message string by from a pattern and its arguments.
+     *
+     * @param locale Locale in which the message should be translated.
+     * @param pattern Format specifier.
+     * @param arguments Format arguments.
+     * @return a localized message string.
+     */
+    public static String buildMessage(Locale locale,
+                                      Localizable pattern,
+                                      Object ... arguments) {
+        return buildMessage(locale, null, pattern, arguments);
+    }
+
+    /**
+     * Builds a message string by from two patterns (specific and general) and
+     * an argument list.
+     *
+     * @param locale Locale in which the message should be translated.
+     * @param specific Format specifier (may be null).
+     * @param general Format specifier (may be null).
+     * @param arguments Format arguments. They will be substituted in
+     * <em>both</em> the {@code general} and {@code specific} format specifiers.
+     * @return a localized message string.
+     */
+    public static String buildMessage(Locale locale,
+                                      Localizable specific,
+                                      Localizable general,
+                                      Object ... arguments) {
+        final StringBuilder sb = new StringBuilder();
+        if (general != null) {
+            final MessageFormat fmt = new MessageFormat(general.getLocalizedString(locale), locale);
+            sb.append(fmt.format(arguments));
+        }
+        if (specific != null) {
+            if (general != null) {
+                sb.append(": ");
+            }
+            final MessageFormat fmt = new MessageFormat(specific.getLocalizedString(locale), locale);
+            sb.append(fmt.format(arguments));
+        }
+
+        return sb.toString();
+    }
+}