--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifact-database/src/main/java/org/dive4elements/artifactdatabase/DefaultCallMeta.java	Thu Apr 25 10:57:18 2013 +0200
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2010 by Intevation GmbH
+ *
+ * This program is free software under the LGPL (>=v2.1)
+ * Read the file LGPL.txt coming with the software for details
+ * or visit http://www.gnu.org/licenses/ if it does not exist.
+ */
+
+package de.intevation.artifactdatabase;
+
+import de.intevation.artifacts.CallMeta;
+import de.intevation.artifacts.PreferredLocale;
+
+import java.util.Locale;
+
+/**
+ * Default implementation of CallMeta. It provides a list of
+ * preferred langauages and implements an intersection mechanism
+ * to figure out the best matching language given a list of server
+ * provided languages.
+ * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
+ */
+public class DefaultCallMeta
+implements   CallMeta
+{
+    /**
+     * The list of preferred languages.
+     */
+    protected PreferredLocale [] languages;
+
+    /**
+     * Default constructor.
+     */
+    public DefaultCallMeta() {
+    }
+
+    /**
+     * Creates new DefaultCallMeta with a given list of languages.
+     * @param languages The list of preferred languages.
+     */
+    public DefaultCallMeta(PreferredLocale [] languages) {
+        this.languages = languages;
+    }
+
+    public PreferredLocale [] getLanguages() {
+        return languages;
+    }
+
+    public Locale getPreferredLocale(Locale [] locales) {
+        if (locales == null || locales.length == 0) {
+            return null;
+        }
+
+        Locale best    = null;
+        float  quality = -Float.MAX_VALUE;
+
+        for (int i = 0; i < locales.length; ++i) {
+            Locale wish         = locales[i];
+            String wishLanguage = wish.getLanguage();
+
+            for (int j = 0; j < languages.length; ++j) {
+                PreferredLocale have        = languages[j];
+                Locale          haveLocale  = have.getLocale();
+                if (haveLocale.getLanguage().equals(wishLanguage)) {
+                    float haveQuality = have.getQuality();
+                    if (haveQuality > quality) {
+                        quality = haveQuality;
+                        best    = wish;
+                    }
+                    break; // Languages should not contain
+                           // same locale twice.
+                }
+            }
+        }
+
+        return best == null
+            ? locales[0]
+            : best;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :