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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Created: (TIKA-203) Earlier metadata extraction in ParsingReader
Date Wed, 11 Feb 2009 16:14:59 GMT
Earlier metadata extraction in ParsingReader

                 Key: TIKA-203
                 URL: https://issues.apache.org/jira/browse/TIKA-203
             Project: Tika
          Issue Type: Improvement
          Components: parser
            Reporter: Jukka Zitting
            Priority: Minor

The normal parse() method guarantees that all extracted metadata will be available in the
metadata object once the method returns. But since the ParsingReader class runs the parse()
method in a background thread, one can only assume that extracted metadata is available once
the entire character stream has been consumed. This is troublesome for example when creating
Lucene Document objects, as Lucene postpones reading the given character stream to when the
already constructed Document is passed to an IndexWriter. The result is that (depending on
thread scheduling and the structure of the input document format) metadata may not be available
for inclusion in the indexed Document.

One way of fixing this issue is to add a small character buffer in ParsingReader, and to make
sure that the buffer is filled with extracted text before the ParsingReader constructor returns.
This should ensure that relevant document metadata is almost always available, since the majority
of document formats have all or most metadata at the beginning of the document stream.

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