Restoring Usage Event Listener until proper patch is prepared

git-svn-id: http://scm.dspace.org/svn/repo/dspace/trunk@6132 9c30dcfa-912a-0410-8fc2-9e0234be79fd

dspace-api/src/main/java/org/dspace/usage/AbstractUsageEventListener.java

@@ -0,0 +1,54 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+package org.dspace.usage;
+
+import org.dspace.services.EventService;
+import org.dspace.services.model.EventListener;
+
+/**
+ * AbstractUsageEventListener is used as the base class for listening events running
+ * in the EventService.
+ * 
+ * @author Mark Diggory (mdiggory at atmire.com)
+ * @version $Revision: $
+ */
+public abstract class AbstractUsageEventListener implements EventListener {
+
+	public AbstractUsageEventListener() {
+		super();
+	}
+
+	/**
+	 * Empty String[] flags to have Listener 
+	 * consume any event name prefixes.
+	 */
+	public String[] getEventNamePrefixes() {
+		return new String[0];
+	}
+
+	/**
+	 * Currently consumes events generated for
+	 * all resources.
+	 */
+	public String getResourcePrefix() {
+		return null;
+	}
+
+	public void setEventService(EventService service) {
+		if(service != null)
+        {
+            service.registerEventListener(this);
+        }
+		else
+        {
+            throw new IllegalStateException("EventService handed to Listener cannot be null");
+        }
+	
+	}
+	
+}