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A Catalog
is a collection of named Command
s (or
Chain
s) that can be used retrieve the set of commands that
should be performed based on a symbolic identifier. Use of catalogs
is optional, but convenient when there are multiple possible chains
that can be selected and executed based on environmental conditions.
Field Summary | |
static String |
CATALOG_KEY
A default context attribute for storing a default Catalog ,
provided as a convenience only. |
Method Summary | |
void |
addCommand(String name,
Command command)
Add a new name and associated Command or Chain
to the set of named commands known to this Catalog ,
replacing any previous command for that name. |
Command |
getCommand(String name)
Return the Command or Chain associated with the
specified name, if any; otherwise, return null . |
Iterator |
getNames()
Return an Iterator over the set of named commands
known to this Catalog . |
Field Detail |
public static final String CATALOG_KEY
A default context attribute for storing a default Catalog
,
provided as a convenience only.
Method Detail |
public void addCommand(String name, Command command)
Add a new name and associated Command
or Chain
to the set of named commands known to this Catalog
,
replacing any previous command for that name.
name
- Name of the new commandcommand
- Command
or Chain
to be returned
for later lookups on this namepublic Command getCommand(String name)
Return the Command
or Chain
associated with the
specified name, if any; otherwise, return null
.
name
- Name for which a Command
or Chain
should be retrieved
public Iterator getNames()
Return an Iterator
over the set of named commands
known to this Catalog
. If there are no known commands,
an empty Iterator is returned.
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