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From "Davor Bonaci (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (BEAM-225) Create Class for Common TypeDescriptors
Date Tue, 03 May 2016 18:27:13 GMT

     [ https://issues.apache.org/jira/browse/BEAM-225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davor Bonaci updated BEAM-225:
------------------------------
    Assignee: Jesse Anderson  (was: Davor Bonaci)

> Create Class for Common TypeDescriptors
> ---------------------------------------
>
>                 Key: BEAM-225
>                 URL: https://issues.apache.org/jira/browse/BEAM-225
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Jesse Anderson
>            Assignee: Jesse Anderson
>            Priority: Trivial
>              Labels: starter
>
> There should be a built-in class for common types like String, Float, etc.
> Right now, all types have to create an inline TypeDescriptor:
> {code:java}
>         PCollection<String> words = suits.apply(
>                 FlatMapElements.via(
>                         (String line) -> Arrays.asList(line.split(" "))
>                 ).withOutputType(new TypeDescriptor<String>() {}));
> {code}
> The should be a built-in class with common types like String so you don't have to create
a TypeDescriptor each time like:
> {code:java}
>               PCollection<String> words = suits.apply(
>                 FlatMapElements.via(
>                         (String line) -> Arrays.asList(line.split(" "))
>                 ).withOutputType(TypeDescriptors.STRINGS));
> {code}
> Another possibility is to make it a static method:
> {code:java}
>               PCollection<String> words = suits.apply(
>                 FlatMapElements.via(
>                         (String line) -> Arrays.asList(line.split(" "))
>                 ).withOutputType(TypeDescriptors.strings()));
> {code}
> An example of this is Apache Crunch's Writables class https://crunch.apache.org/apidocs/0.11.0/org/apache/crunch/types/writable/Writables.html.



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