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Posted to dev@ws.apache.org by "Andreas Veithen (JIRA)" <ji...@apache.org> on 2016/01/05 09:03:39 UTC
[jira] [Commented] (AXIOM-478) Solution for parsing large XML
[ https://issues.apache.org/jira/browse/AXIOM-478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082606#comment-15082606 ]
Andreas Veithen commented on AXIOM-478:
---------------------------------------
Some questions:
* Are the extension elements for CMIS implemented using custom code, or are you using an existing library?
* What are your constraints regarding the StAX implementation? In particular, does the solution have to work with IBM's XLXP parser?
> Solution for parsing large XML
> ------------------------------
>
> Key: AXIOM-478
> URL: https://issues.apache.org/jira/browse/AXIOM-478
> Project: Axiom
> Issue Type: Question
> Reporter: LU Jie
>
> This is LU Jie from IBM. We use axiom to parse Atom in our project.
> One of our CMIS API will attach file content to the XML. If the file size is large, we will get a large atom.
> If we use Entry.getExtension(QName) to parse the content, it will allocate a large memory(around 5-6 times of the file size).
> We need you help to clarify if we can use DOM-like API of axiom to get the text of a certain element as stream. That is without allocating a large object in memory.
> Or is there an alternative solution for this use case?
> We DO know that we can use pull-parser to parse the XML as stream. But we need help to investigate if axiom has already provided an API or solution to avoid writing parser by ourselves.
> Here's the sample XML. We need to parse the text of cmisra:base64 element:
> {noformat}
> <atom:entry
> xmlns:atom="http://www.w3.org/2005/Atom"
> xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/"
> xmlns:chemistry="http://chemistry.apache.org/"
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/">
> <atom:id
> xmlns:atom="http://www.w3.org/2005/Atom">urn:uuid:00000000-0000-0000-0000-00000000000
> </atom:id>
> <atom:title
> xmlns:atom="http://www.w3.org/2005/Atom" type="text">doucment1446016556658.txt
> </atom:title>
> <atom:updated
> xmlns:atom="http://www.w3.org/2005/Atom">2015-10-28T07:15:57.594Z
> </atom:updated>
> <cmisra:content
> xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/">
> <cmisra:mediatype
> xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/">text/plain
> </cmisra:mediatype>
> <chemistry:filename
> xmlns:chemistry="http://chemistry.apache.org/">doucment1446016556658.txt
> </chemistry:filename>
> <cmisra:base64
> xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/">Base64 encoded content of large file
> </cmisra:base64>
> </cmisra:content>
> <cmisra:object
> xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/">
> <cmis:properties
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/">
> <cmis:propertyId
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/" propertyDefinitionId="cmis:objectTypeId">
> <cmis:value
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/">snx:file
> </cmis:value>
> </cmis:propertyId>
> <cmis:propertyString
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/" propertyDefinitionId="cmis:name">
> <cmis:value
> xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/">doucment1446016556658.txt
> </cmis:value>
> </cmis:propertyString>
> </cmis:properties>
> </cmisra:object>
> </atom:entry>
> {noformat}
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