Oh ok. I didn’t realize I needed to write my own class to implement it. I was
looking for some sort of existing framework.
What is the purpose of the 2 InputStreamFactory classes:
I was re-reading some emails with Nick Burch back around Dec 22-23 and maybe I
mis-understood him, but it sounds like he was saying that TiksInputStream was
smart enough to automatically spool the stream to disk to allow re-use.
It seems to me that I need an extra pass through the data in order to save to
disk. I’m not starting from a File, but from a stream. So if I need to read
the stream twice, I really have to pass through the data 3 times, correct?
Unless there is a way to save to disk during the first pass
(try/catch removed for simplicity)
tis = TikaInputSream.get(InputStream);
file = tis.getFile(); <== extra pass
tis = TikaInputStream.get(new MyInputStreamFactory(file));
// first real pass
InputStream is = tis.getInputStreamFactory().getInputStream()
// second real pass
}
From: Luís Filipe Nassif <lfcnas...@gmail.com>
Sent: Monday, February 22, 2021 5:42 PM
To: Peter Kronenberg <peter.kronenb...@torch.ai>
Cc: user@tika.apache.org
Subject: Re: Re-using a TikaStream
Something like:
class MyInputStreamFactory implements InputStreamFactory{
private File file;
public MyInputStreamFactory(File file){
this.file = file;
}
public InputStream getInputStream(){
return new FileInputStream(file);
}
}
in your client code:
Parser parser = new AutoDetectParser();
TikaInputStream tis = TikaInputStream.get(new MyInputStreamFactory(file));
parser.parse(tis, new ToTextContentHandler(), new Metadata(), new
ParseContext());
when you need to reuse the stream (into your parser):
public void parse(InputStream stream, ContentHandler handler, Metadata
metadata, ParseContext context)
throws IOException, SAXException, TikaException {
//(...)
TikaInputStream tis = TikaInputStream.get(stream);
if(tis.hasInputStreamFactory()){
try(InputStream is = tis.getInputStreamFactory().getInputStream()){
//consume the new stream
}
}else
throw new IOException("not a reusable inputStream");
}
Of course this is useful if you are not processing files, e.g. reading files
from the cloud or sockets.
Regards,
Luis
Em seg., 22 de fev. de 2021 às 19:18, Peter Kronenberg
<peter.kronenb...@torch.ai<mailto:peter.kronenb...@torch.ai>> escreveu:
I sent this question late on Friday. Sending it again. Can you provide a
little more information how out to use the InputStreamFactory?
From: Peter Kronenberg
<peter.kronenb...@torch.ai<mailto:peter.kronenb...@torch.ai>>
Sent: Friday, February 19, 2021 5:10 PM
To: user@tika.apache.org<mailto:user@tika.apache.org>;
lfcnas...@gmail.com<mailto:lfcnas...@gmail.com>
Subject: RE: Re-using a TikaStream
This email was sent from outside your organisation, yet is displaying the name
of someone from your organisation. This often happens in phishing attempts.
Please only interact with this email if you know its source and that the
content is safe.
There appear to be 2 InputStreamFactory classes: in tika-server-core and
tika-io. The one in server.core is the only one with a concrete class.
I’m not quite sure I see how to use this.
Normally, I create a TikaInputStream with TikaInputStream.get(InputStream).
How do I create it from an InputStreamFactory?
TikaInputStream.getInputStreamFactory() only returns a factory if the
TikaInputStream was created from a factory.
Is there a good example of how this is used
From: Peter Kronenberg
<peter.kronenb...@torch.ai<mailto:peter.kronenb...@torch.ai>>
Sent: Friday, February 19, 2021 4:57 PM
To: user@tika.apache.org<mailto:user@tika.apache.org>;
lfcnas...@gmail.com<mailto:lfcnas...@gmail.com>
Subject: RE: Re-using a TikaStream
This email was sent from outside your organisation, yet is displaying the name
of someone from your organisation. This often happens in phishing attempts.
Please only interact with this email if you know its source and that the
content is safe.
Thanks. I thought that TikaInputStream already automatically saved to disk to
allow re-reading.
From: Luís Filipe Nassif <lfcnas...@gmail.com<mailto:lfcnas...@gmail.com>>
Sent: Friday, February 19, 2021 3:44 PM
To: user@tika.apache.org<mailto:user@tika.apache.org>
Subject: Re: Re-using a TikaStream
You could call TikaInputStream.getPath() at the beginning of your parser, it
will spool to file if not file based. After consuming the original inputStream,
create a new one from the temp file created.
If you are using 2.0.0-ALPHA, there is:
https://github.com/apache/tika/blob/main/tika-core/src/main/java/org/apache/tika/io/InputStreamFactory.java
Use with the new methods from TikaInputStream:
public static TikaInputStream get(InputStreamFactory factory)
public InputStreamFactory getInputStreamFactory()
Hope this helps,
Luis
Em sex., 19 de fev. de 2021 às 16:09, Peter Kronenberg
<peter.kronenb...@torch.ai<mailto:peter.kronenb...@torch.ai>> escreveu:
If I finish parsing a TikaStream, can I re-use the stream (before it is
closed)? I know you said that there is some magic behind the scenes where it
spools it to a file. Can I just call reset() to start from the beginning?
Peter
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