Hook: Define Catalog Filter

Requirement

Only selected items of a Catalog shall be visible to a part of an application.

Filters are most often used in connection with displaying the contents of Catalogs. If you want to display only selected CatalogItems, use a filtered Catalog.

Method of Adaptation

Enable Feature

Level of Support

Parameter Pattern

HotSpot

Filters

Participants

CatalogFilter, NewFilter , Catalog, originalCatalog , filteredCatalog

Changes

1. subclass NewFilter of CatalogFilter.
2. NewFilter.match implements CatalogFilter.match returning true for every CatalogItem that shall be part of the filtered Catalog.
3. instance originalCatalog of Catalog.
4. instance filteredCatalog of NewFilter with parameter originalCatalog.