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home > news > java technology > eclipse, com ... nothing new...

Eclipse, COM ... nothing new...

When reading http://www.eclipsezone.com/articles/what-is-iadaptable/ I got the impression that certain solutions always come back, are quite universal and independant of domain, language or environment. The question here is about getting certain aspects of an object that are not statically declared in a yet typesafe manner. The Eclipse world came up with IAdaptable, as it seems. public interface IAdaptable { Object getAdapter(Class clazz); } public class HashMap implements IAdaptable { public Object getAdapter(Class clazz) { if (clazz == java.util.List.class) { List list = new ArrayList(this.size()); list.addAll(this.values()); return list; } return null; } // ... } To be used like that: IAdaptable adaptable = new HashMap(); List list = (List)adaptable.getAdapter(java.util.List.class); Well, this immediately brought back good-old COM, Microsofts Component Object Model back to my mind. I alway felt comfortable with COM because COM objects are just as plain C++ objects and thus very fast. The basics are the same. Every object is just a IUnknown (which transforms into an IAdaptable) [ object, uuid(00000000-0000-0000-C000-000000000046) ] interface IUnknown { [restricted] HRESULT _stdcall QueryInterface([in] GUID* rrid, [out] void** ppvObj); [restricted] unsigned long _stdcall AddRef(); [restricted] unsigned long _stdcall Release(); } For this is nothing useful, derived interfaces ...


Date: February, 26 2010
Url: http://www.java.net/blog/herkules/archive/2010/02/26/eclipse-com-nothing-new


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