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Purpose:
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Used by the DistributeStates function below to find the
HISTORY_STREAM corresponding to a given entity.
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Derivation:
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StreamFinder : ACIS_OBJECT : -
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Filename:
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kern/kernel/sg_husk/history/history.hxx
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Description:
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This class is used by the DistributeStates function below to find the
HISTORY_STREAM corresponding to a given entity. It gives a great deal of flexibility and supports a variety of usage scenarios. At the same time user needs to be careful during usage. This is a class, instead of function pointers, hence it can cache data or arguments without using the global data hack. Examples of implementations are:
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. Find the top level owner and get the stream from an
ATTRIB_HISTORY found there.
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. Find the
PART for the
ENTITY and return the stream associated with the
PART.
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. Always return the same stream. This is useful when the application has some knowledge about what has transpired and knows all
BULLETINs go on the same stream.
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References:
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by KERN
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HISTORY_MANAGER
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Data:
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public enum LookStrategy;
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Type of look strategy.
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Constructor:
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public: StreamFinder::StreamFinder
();
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C++ allocation constructor requests memory for this object.
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Methods:
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public: virtual HISTORY_STREAM* StreamFinder::findStream
(
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ENTITY*,
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//Entity Object
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LookStrategy strategy
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//Type of look strategy
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= LookNormal
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//
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)= 0;
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Function to return the
HISTORY_STREAM for any entity.
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public: virtual HISTORY_STREAM* StreamFinder::quick_findStream
(
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ENTITY*
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//Entity Object
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);
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Function to return the
HISTORY_STREAM for any entity whose stream needs to be quickly determined. This check is very fast.
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