RatingService Phase 1.

The RatingService will allow users to apply ratings to content nodes in the repository.
  There will be a number of built-in Rating Schemes and support to add more by the usual extension mechanism.
  Out of the box, we envision a 'likes' scheme (user X likes this document) and a 'star' rating
    (user X gave this document 3 out of 5 stars).

  Content model for ratings.
  Spring config includes two out-of-the-box rating schemes
  Various basic infrastructure classes for Ratings, RatingSchemes and the service itself.
  Basic CRUD for ratings in a Java foundation layer.
  Associated JUnit tests.

The next contribution will add support for per-node average and total ratings and associated tests.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@21000 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/rating/RatingSchemeRegistry.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.alfresco.repo.rating;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.alfresco.service.cmr.rating.RatingScheme;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * This class maintains a registry of all known {@link RatingScheme rating schemes} in the system.
+ * @author Neil McErlean
+ * @since 3.4
+ */
+public class RatingSchemeRegistry
+{
+    private static final Log log = LogFactory.getLog(RatingSchemeRegistry.class);
+    
+    Map<String, RatingScheme> ratingSchemes = new HashMap<String, RatingScheme>();
+
+    public void register(String name, RatingScheme ratingScheme)
+    {
+        ratingSchemes.put(name, ratingScheme);
+        if (log.isDebugEnabled())
+        {
+            StringBuilder msg = new StringBuilder();
+            msg.append("Registering ")
+               .append(ratingScheme);
+
+            log.debug(msg.toString());
+        }
+    }
+
+    /**
+     * This method returns an unmodifiable map of the registered rating schemes.
+     * @return
+     */
+    public Map<String, RatingScheme> getRatingSchemes()
+    {
+        return Collections.unmodifiableMap(ratingSchemes);
+    }
+}