Concrete implementations of generic Commands that are useful in many different environments, not tied to a particular tier such as Servlets).
Copy a specified literal value, or a context attribute stored under the fromKey (if any), to the toKey.
fromKey
toKey
This command combines elements of the LookupCommand with the DispatchCommand .
Look up a specified Command (which could also be a org.apache.commons.chain.Chain ) in a Catalog , and delegate execution to it.
Remove any context attribute stored under the fromKey.