GUACAMOLE-1123: Fixes to comments, method scope, and minor code tweaks.

guacamole/src/main/java/org/apache/guacamole/rest/connection/APIConnectionWrapper.java

@@ -143,7 +143,8 @@ public class APIConnectionWrapper implements Connection {
     @Deprecated
     @Override
     public List<? extends ConnectionRecord> getHistory() throws GuacamoleException {
-        return Collections.<ConnectionRecord>emptyList();
+        throw new GuacamoleUnsupportedException("APIConnectionWrapper does not "
+                + "support retrieving connection history.");
     }
     
     @Override

guacamole/src/main/java/org/apache/guacamole/rest/history/ActivityRecordSetResource.java

@@ -84,7 +84,7 @@ public abstract class ActivityRecordSetResource<InternalRecordType extends Activ
      *     A new record object containing the same data as the given internal
      *     record, but intended for use in interchange.
      */
-    public abstract ExternalRecordType toExternalRecord(InternalRecordType record);
+    protected abstract ExternalRecordType toExternalRecord(InternalRecordType record);
 
     /**
      * Retrieves the list of activity records stored within the underlying

guacamole/src/main/java/org/apache/guacamole/rest/history/ConnectionHistoryResource.java

@@ -42,7 +42,7 @@ public class ConnectionHistoryResource extends ActivityRecordSetResource<Connect
     }
 
     @Override
-    public APIConnectionRecord toExternalRecord(ConnectionRecord record) {
+    protected APIConnectionRecord toExternalRecord(ConnectionRecord record) {
         return new APIConnectionRecord(record);
     }
 

guacamole/src/main/java/org/apache/guacamole/rest/history/UserHistoryResource.java

@@ -41,7 +41,7 @@ public class UserHistoryResource extends ActivityRecordSetResource<ActivityRecor
     }
 
     @Override
-    public APIActivityRecord toExternalRecord(ActivityRecord record) {
+    protected APIActivityRecord toExternalRecord(ActivityRecord record) {
         return new APIActivityRecord(record);
     }
 

guacamole/src/main/java/org/apache/guacamole/rest/user/APIUserWrapper.java

@@ -143,7 +143,7 @@ public class APIUserWrapper implements User {
     @Deprecated
     @Override
     public List<? extends ActivityRecord> getHistory() throws GuacamoleException {
-        return Collections.<ActivityRecord>emptyList();
+        throw new GuacamoleUnsupportedException("APIUserWrapper does not provide login history.");
     }
     
     @Override