Completed subscriptions REST API and added a bit more UI logic

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@28488 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/service/cmr/subscriptions/SubscriptionService.java

@@ -144,7 +144,7 @@ public interface SubscriptionService
     int getFollowersCount(String userId);
 
     /**
-     * Follows another
+     * Follows a user.
      * 
      * @param userId
      *            the id of the user
@@ -154,6 +154,14 @@ public interface SubscriptionService
     @Auditable(parameters = { "userId", "userToFollow" })
     void follow(String userId, String userToFollow);
 
+    /**
+     * Unfollows a user.
+     * 
+     * @param userId
+     *            the id of the user
+     * @param userToUnfollow
+     *            the id of the user to unfollow
+     */
     @Auditable(parameters = { "userId", "userToUnfollow" })
     void unfollow(String userId, String userToUnfollow);
 
@@ -191,4 +199,10 @@ public interface SubscriptionService
      */
     @NotAuditable
     boolean isSubscriptionListPrivate(String userId);
+
+    /**
+     * Returns if subscription are enabled for this system.
+     */
+    @NotAuditable
+    boolean subscriptionsEnabled();
 }

source/java/org/alfresco/service/cmr/subscriptions/SubscriptionsDisabledException.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2005-2011 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.service.cmr.subscriptions;
+
+import org.alfresco.error.AlfrescoRuntimeException;
+
+/**
+ * This exception is thrown if subscriptions are disabled.
+ * 
+ * @author Florian Mueller
+ * @since 4.0
+ */
+public class SubscriptionsDisabledException extends AlfrescoRuntimeException
+{
+    private static final long serialVersionUID = 6971869799749343887L;
+
+    public SubscriptionsDisabledException(String msg)
+    {
+        super(msg);
+    }
+
+    public SubscriptionsDisabledException(String msg, Throwable cause)
+    {
+        super(msg, cause);
+    }
+}