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https://issues.apache.org/jira/browse/AXIOM-478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andreas Veithen updated AXIOM-478:
----------------------------------
Description:
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}
was:
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:
<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>
> 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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