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https://issues.apache.org/jira/browse/JOHNZON-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329121#comment-16329121
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Dirk Rudolph commented on JOHNZON-153:
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For reference, in jackson ther is a method allowing to do that:
http://fasterxml.github.io/jackson-core/javadoc/2.9/com/fasterxml/jackson/core/JsonGenerator.html#writeString(java.io.Reader,%20int)
> Support streaming String values using Reader
> --------------------------------------------
>
> Key: JOHNZON-153
> URL: https://issues.apache.org/jira/browse/JOHNZON-153
> Project: Johnzon
> Issue Type: Improvement
> Components: Core
> Environment: Currently there are 2 ways writing a String value to
> JsonGenerator:
> # using {{JsonGenerator#write(java.lang.String, javax.json.JsonValue)}} and
> {{JsonGenerator#write(javax.json.JsonValue)}} respectively or
> # using {{JsonGenerator#write(java.lang.String, java.lang.String)}} and
> {{JsonGenerator#write(java.lang.String)}} respectively
> where in the former case {{JsonValue}} has to be a {{JsonString}} otherwise a
> ClassCastException will be thrown in
> [JsonGeneratorImpl#writeJsonValue(java.lang.String,
> javax.json.JsonValue)|https://github.com/apache/johnzon/blob/master/johnzon-core/src/main/java/org/apache/johnzon/core/JsonGeneratorImpl.java#L203].
> It would be great to change that implementation detail so that a consumer can
> implement its own implementation of {{JsonValue}} with {{ValueType#STRING}}
> but working with {{Reader}} internally so that not the entire String is kept
> in memory.
> The use case behind that I use johonzon to write a solr-json formatted list
> of update commands for solr and want to use tika to parse (potentially huge)
> files into plain text sending them as individual field in my json object.
> Reporter: Dirk Rudolph
> Priority: Major
>
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