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https://issues.apache.org/jira/browse/CRUNCH-77?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kiyan Ahmadizadeh updated CRUNCH-77:
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Attachment: CRUNCH-77.patch
This patch modifies the implementation of the Scala PObject as follows:
1. PObject is now a trait with a value() method.
2. A concrete class that implements the PObject trait and is backed by a
JPObject is added. This concrete class converts the value returned by the
JPObject into the type of value returned by the Scala PObject, through the use
of an implicit value of type Converter[J, T].
3. Instances of the type class Converter[J, T] are created for converting
values from all Java primitive types to their Scala equivalents (Byte, Short,
Int, etc.)
4. An implicit function that returns an identity converter is also used (ie as
a default, if there is no conversion from the type encapsulated by the JPObject
to the type encapsulated by the PObject, the value from the JPObject is
returned directly).
5. Implicit functions that return Converters for java.util.Collection => Seq
and java.util.Map => Map are added.
6. A companion object for PObject is added, which knows how to create Scala
PObjects from Java PObjects.
7. Method asSeq added to PCollectionLike.scala, so now a PObject of a Scala Seq
can be obtained from a PCollection.
8. Method asMap added to PTable.scala so now a PObject of a Scala immutable Map
can be obtained from a PTable.
9. Tests for asSeq and asMap are added.
10. Tests for converting Java PObjects to Scala PObjects are added for
primitives, collections, and maps.
> Scala PObjects should contain values of Scala types, not Java types.
> --------------------------------------------------------------------
>
> Key: CRUNCH-77
> URL: https://issues.apache.org/jira/browse/CRUNCH-77
> Project: Crunch
> Issue Type: Improvement
> Components: Scrunch
> Affects Versions: 0.4.0
> Reporter: Kiyan Ahmadizadeh
> Assignee: Kiyan Ahmadizadeh
> Attachments: CRUNCH-77.patch
>
>
> The current implementation of PObjects in Scrunch simply wraps a Java PObject
> (JPObject) and returns a value of the same type as that returned by the
> underlying JPObject. This is inconvenient, as users will likely wish to work
> with Scala types instead of Java types.
> PObjects in Scala should be modified to allow for conversions between Java
> and Scala types when returning values from the PObject.
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