public static void checkOut(EPMWorkspace epmWorkSpace, EPMDocument cad) throws Exception {
		if(CheckInOutTaskLogic.isCheckedOut(cad)){
			cad = (EPMDocument) CheckInOutTaskLogic.getWorkingCopy(cad);
		} else {
			WTArrayList collector = new WTArrayList();
			collector.add(cad);			
			WTValuedMap checkedOutObjects = EPMWorkspaceHelper.manager.checkout(epmWorkSpace, collector);
			cad = (EPMDocument)((ObjectReference)checkedOutObjects.get(cad)).getObject();
		}
	}	
	
	public static void checkIn(EPMWorkspace epmWorkSpace, EPMDocument cad) throws Exception {		
		CheckinOption cio = new CheckinOption("checked in by loader");
		WTKeyedHashMap wtkeymap = new WTKeyedHashMap();
		wtkeymap.put( cad, cio );			
		EPMWorkspaceHelper.manager.checkin(epmWorkSpace, wtkeymap);
	}
	
	
	public static void removeFromWS(EPMWorkspace epmWorkSpace, EPMDocument cad) throws Exception {
		WTArrayList collector = new WTArrayList();
		collector.add(cad);	
		EPMWorkspaceHelper.manager.removeFromWorkspace(epmWorkSpace, collector);
	}

	public static EPMWorkspace findWorkspace(String name, WTPrincipal owner) throws WTException {
		QuerySpec select = new QuerySpec(EPMWorkspace.class);
		select.appendWhere(new SearchCondition(EPMWorkspace.class,EPMWorkspace.NAME, SearchCondition.EQUAL, name), new int[] {0});
		select.appendAnd();
		select.appendWhere(new SearchCondition(EPMWorkspace.class, EPMWorkspace.PRINCIPAL_REFERENCE +"."+ WTAttributeNameIfc.REF_OBJECT_ID, SearchCondition.EQUAL, PersistenceHelper.getObjectIdentifier(owner).getId()), new int[] {0});
		QueryResult workspaces = PersistenceHelper.manager.find((StatementSpec)select);
		return (EPMWorkspace) (workspaces.hasMoreElements() ? workspaces.nextElement() : null);
	}