[jira] Updated: (TIKA-116) Streaming parser for OpenDocument files

["Jukka Zitting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TIKA-116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting updated TIKA-116:
-------------------------------

    Attachment: TIKA-116.patch

Attached a patch that implements streaming parsing for XML and OpenDocument files.

The patch contains an implementation of a simple SAX-based XPath subset (in o.a.t.sax.xpath) that is capable of processing all the XPath expressions in our current codebase.

> Streaming parser for OpenDocument files
> ---------------------------------------
>
>                 Key: TIKA-116
>                 URL: https://issues.apache.org/jira/browse/TIKA-116
>             Project: Tika
>          Issue Type: Improvement
>          Components: parser
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 0.2-incubating
>
>         Attachments: TIKA-116.patch
>
>
> The current OpenOfficeParser first reads the entire meta.xml and content.xml files from the given OpenDocument zip into memory, then parses the in-memory files to DOM trees, merges the trees, and finally evaluates a number of XPath expressions against the resulting DOM tree to extract metadata and document content. All this requires quite a bit of memory and multiple passes over the document.
> It would be better if the document could be streamed directly through zip and sax parsers without keeping a full copy of the document in memory or doing multiple passes over the document.

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