Diagnosing Java Code: The Impostor Type bug pattern
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Description:
When special tags in fields are used to distinguish between types of objects, errors are possible in which a tag mislabels the associated data -- a bug pattern known as the Impostor Type. This article examines the symptoms and causes of this bug, defines ways to prevent this error from occurring, and discusses a tempting hybrid implementation that does not use impostor types but, in the end, turns out to have many of the same weaknesses. Article includes code snipets.
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Date Added:
Jul 3, 2001
Last Updated:
Jul 3, 2001
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