The PortletMode class represents
the possible modes that a portlet can assume.
A portlet mode indicates the function a portlet is performing.
Normally, portlets perform different tasks and create different
content depending on the function they are currently performing.
When invoking a portlet, the portlet container provides the
current portlet mode to the portlet.
Portlets can programmatically change their portlet
mode when processing an action request.
This class defines the default portlet modes EDIT, HELP, VIEW.
Additional portlet modes may be defined by calling the constructor
of this class. If a portal/portlet-container does not support a
custom portlet mode defined in the portlet application deployment descriptor,
the custom portlet mode will be ignored by the portal/portlet container.
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