4. Stacking Composition Adapters

More then one composition adapter can be applied to a composition pattern. You can stack them onto each other. The composition adapters are inserted in the order you applied them to the composition pattern. For technical reasons, no composition adapter can be applied to a composition pattern when there are allready some components filled in. We hope to change this in one of the next releases. So, first clear the canvas again. Then, again map the start filter composition adapter onto the ToggleControl composition pattern. We also have an algorithm that is able to find out the role mappings automatically. You can test this when you apply the start filter onto the ToggleControl composition pattern, but did not yet map the roles. Press the right mouse button and select automatically map adapter roles. The Dst and Src should now be automatically mapped on their corresponding roles. Then, place the stop_filter composition adapter on the canvas and map it also on the ToggleControl composition pattern. You'll notice that it has been stacked upon the start_filter composition adapter. You can then also automatically map the adapter roles for the stop_filer composition adapter. Then again, map the JButton component onto the Control role and place the Juggler component onto Subject role. Place two ViewFilter components on the canvas and map these components on the remaining roles. Code-generation can now start. Notice that now both the start and stop events are re-routed through a ViewFilter component, but each event is of course always send to the same ViewFilter. It is also possible to only use one ViewFilter component and let this component filter both events.

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