To speed up type comparisons, the TypeLattice keeps a cache of comparison
information in a 2D array. The 2D array is preallocated in the TypeLattice
class of size Type.HASH_MAX. You have to change that value when adding a
new type. (or simply implement the getTypeHash method to return
HASH_INVALID (as the documentation suggests).
Note, however that it is not necessary to add new types to the type
lattice, as long as they are not comparable with existing types (other than
UNKNOWN and GENERAL. Simply having the type class is enough to get the
type system to check types for you. There is an example of how to do this
in data/type/test/TestToken.java
Steve
At 06:49 PM 11/4/2003 -0800, Efrat Jaeger wrote:
Hi,
I'm adding a new type to BaseType.java; a database connection type which
would be passed between actors in a workflow to keep the DB Connection
variable.
I've changed the following files:
TypeLattice - added nodeweight and edges (to general and unknown).
Constants - added the new type to the hash table.
BaseType - added the type in a similar manner as the other types.
I also created a DBConToken class which contains all the methods as
ObjectToken (changed for this purpose).
I get an exception: ArrayIndexOutOfBound in the compare method of
TypeLattice (exception 14). I saw that this exception occurs for
MatrixTokens (which isn't the case here). Please let me know if there is
anything else I should change in order to prevent this exception (I assume
that this type should be added in a similar way to ObjectType, since it's
a private case of it). I tried to solve it by changing the
ConversionsUtility file as well, but it wasn't very helpful.
Thank you,
Efrat
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