org.apache.drill.exec.store.easy.json.loader

Interface FieldFactory

All Known Implementing Classes:

BaseFieldFactory, ExtendedTypeFieldFactory, InferredFieldFactory, ProvidedFieldFactory

public interface FieldFactory

Extensible mechanism to build fields for a JSON object (a Drill row or Map).

Method Summary

Modifier and Type	Method and Description
ElementParser	fieldParser(FieldDefn fieldDefn) Create a parser for a field.
ElementParser	forceArrayResolution(FieldDefn fieldDefn)
ElementParser	forceNullResolution(FieldDefn fieldDefn)
ElementParser	ignoredFieldParser()
ValueParser	scalarParserFor(FieldDefn fieldDefn, ColumnMetadata colSchema) Internal method which allows a custom parser (such as for extended types) to provide the scalar parser for a provided schema.

Method Detail

fieldParser

ElementParser fieldParser(FieldDefn fieldDefn)

Create a parser for a field. The caller will add the field to the parent object. Called only for projected fields. May add a "deferred" undefined field if the value type is undefined. Such fields are added to the underlying row or map at a later time.

ignoredFieldParser

ElementParser ignoredFieldParser()

forceNullResolution

ElementParser forceNullResolution(FieldDefn fieldDefn)

forceArrayResolution

ElementParser forceArrayResolution(FieldDefn fieldDefn)

scalarParserFor

ValueParser scalarParserFor(FieldDefn fieldDefn,
                            ColumnMetadata colSchema)

Internal method which allows a custom parser (such as for extended types) to provide the scalar parser for a provided schema.