How do I access underline file represented by an InputStream ?

I need to call an API provided by 3rd party. the API return me an InputStream which represent a file.
Is there any way I can get the underline file information through the InputStream? I'd like to get java.io.File object
to represent the underline file through the InputStream.
I was told that the actul class of InputStream is byteArrayInputStream, but I think I should not rely on this in case they change the implementation later.
Thanks

BIJ001 wrote:
lots of other thingsIncluding a (n unnamed) pipe.what does this mean? does this means a (n unnamed) pipe can be used to access underlying file to resolve my original problem?
I'm asking this question is seeking any posibility, or if proved that there is no such posibility, I will issue some change request to 3rd party.
BIJ001, could you please input few more words, you are just giving another example of InputStream as ejp said there are lot more, or you are trying to give a hints that pipe could be used to resolve my problem?
Thanks

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How do I access underline file represented by an InputStream ?

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