[DMV-12] add: - 'mayHandle' to 'IStoreHandler'.

- 'FileScannedStore' (extracted from 'IncomingProcessor').
change: - More property keys moved to 'PropertyNames'.

SVN: 6060

common/source/java/ch/systemsx/cisd/common/utilities/DirectoryScanningTimerTask.java

@@ -278,7 +278,10 @@ public final class DirectoryScanningTimerTask extends TimerTask
         }
         try
         {
-            handler.handle(item);
+            if (handler.mayHandle(item))
+            {
+                handler.handle(item);
+            }
         } finally
         {
             // If the item still exists, we assume that it has not been handled. So it should be

common/source/java/ch/systemsx/cisd/common/utilities/IStoreHandler.java

@@ -25,4 +25,6 @@ package ch.systemsx.cisd.common.utilities;
 public interface IStoreHandler
 {
     void handle(StoreItem item);
+
+    boolean mayHandle(StoreItem item);
 }

common/source/java/ch/systemsx/cisd/common/utilities/PathHandlerAdapter.java

@@ -40,17 +40,23 @@ public class PathHandlerAdapter implements IStoreHandler
         return new PathHandlerAdapter(handler, directory);
     }
 
+    private final File asFile(final StoreItem item)
+    {
+        return StoreItem.asFile(directory, item);
+    }
+
     //
     // IStoreHandler
     //
 
-    public void handle(final StoreItem item)
+    public final boolean mayHandle(final StoreItem item)
+    {
+        return pathHandler.mayHandle(asFile(item));
+    }
+
+    public final void handle(final StoreItem item)
     {
-        final File path = StoreItem.asFile(directory, item);
-        if (pathHandler.mayHandle(path))
-        {
-            pathHandler.handle(path);
-        }
+        pathHandler.handle(asFile(item));
     }
 
 }