/**
* Add an item to the directory. The names of the objects in the directory are not required to be
* unique. Only items with no container can be added. Items with a container are still viewed as
* being within the workspace, but they are not explicitly listed in the directory. Instead, their
* top-level container is expected to be listed (although this is not enforced). Increment the
* version number.
*
* @param item Item to list in the directory.
* @exception IllegalActionException If the item has a container, is already in the directory, or
* is not in this workspace.
*/
public synchronized void add(NamedObj item) throws IllegalActionException {
if (item.workspace() != this) {
throw new IllegalActionException(
this, item, "Cannot add an item to the directory of a workspace " + "that it is not in.");
}
if (item.getContainer() != null) {
throw new IllegalActionException(
this, item, "Cannot add an object with a container to a workspace " + "directory.");
}
if (_directory.indexOf(item) >= 0) {
throw new IllegalActionException(
this, item, "Object is already listed in the workspace directory.");
}
_directory.add(item);
incrVersion();
}
