1 files changed, 57 insertions, 0 deletions
diff --git a/linguistics/src/main/java/com/yahoo/language/LocaleFactory.java b/linguistics/src/main/java/com/yahoo/language/LocaleFactory.java
new file mode 100644
index 00000000000..2610550dfd2
--- /dev/null
+++ b/linguistics/src/main/java/com/yahoo/language/LocaleFactory.java
@@ -0,0 +1,57 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.language;
+
+import java.util.Locale;
+
+/**
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public final class LocaleFactory {
+
+    private static final Locale UNKNOWN = new Locale("", "", "");
+
+    private LocaleFactory() {
+        // hide
+    }
+
+    /**
+     * <p>Implements a simple parser for RFC5646 language tags. The language tag is parsed into a Locale.</p>
+     *
+     * @param tag The language tag to parse.
+     * @return The corrseponding Locale.
+     */
+    @SuppressWarnings("ConstantConditions")
+    public static Locale fromLanguageTag(String tag) {
+        // TODO: Should be replaced by return Locale.forLanguageTag(tag); ?
+
+        tag.getClass(); // throws NullPointerException
+        tag = tag.trim();
+        if (tag.isEmpty()) {
+            return UNKNOWN;
+        }
+        String language = "";
+        String region = "";
+        String script = "";
+        String[] parts = tag.split("-");
+        for (int partIdx = 0; partIdx < parts.length; ++partIdx) {
+            String part = parts[partIdx];
+            int partLen = part.length();
+            if (partIdx == 0) {
+                if (partLen == 2 || partLen == 3) {
+                    language = part;
+                }
+            } else if (partIdx == 1 || partIdx == 2) {
+                if (partLen == 2 || partLen == 3) {
+                    region = part;
+                } else if (partLen == 4) {
+                    script = part;
+                }
+            }
+        }
+        if (language.isEmpty()) {
+            return UNKNOWN;
+        }
+        return new Locale(language, region, script);
+    }
+
+}