Added a groupID-filtered host request to the Global Orcale

src/de/tud/kom/p2psim/impl/util/oracle/GlobalOracle.java

@@ -173,6 +173,29 @@ public class GlobalOracle implements OracleComponent {
 		}
 	}
 
+	/**
+	 * @return the list with all hosts of the scenario
+	 */
+	public static List<SimHost> getHosts(String groupID) {
+		
+		if(groupID.equals("")) {
+			return getHosts();
+		}
+		else {
+			synchronized (hosts) {
+				ArrayList<SimHost> groupedHosts = new ArrayList<SimHost>();
+				
+				for (SimHost h : hosts) {
+					if(h.getProperties().getGroupID().equals(groupID)) {
+						groupedHosts.add(h);
+					}
+				}
+				
+				return groupedHosts;
+			}
+		}	
+	}
+	
 	@Override
 	public List<Host> getAllHosts() {
 		return new ArrayList<Host>(hosts);