org.apache.druid.catalog.model.table

Class InputFormats.BaseFormatDefn

java.lang.Object

org.apache.druid.catalog.model.table.InputFormats.BaseFormatDefn

All Implemented Interfaces:

InputFormatDefn

Direct Known Subclasses:

InputFormats.FlatTextFormatDefn, InputFormats.JsonFormatDefn

Enclosing class:

InputFormats

public abstract static class InputFormats.BaseFormatDefn
extends Object
implements InputFormatDefn

Base class for input format definitions.

Constructor Summary

Constructors

Constructor and Description
BaseFormatDefn(List<TableFunction.ParameterDefn> parameters)

Method Summary

Modifier and Type	Method and Description
InputFormat	convert(Map<String,Object> jsonMap, com.fasterxml.jackson.databind.ObjectMapper jsonMapper) Convert a generic Java map of input format properties to an input format object.
protected void	convertColumns(Map<String,Object> jsonMap, List<ColumnSpec> columns) Convert columns from the ColumnSpec format used by the catalog to the list of names form requires by input formats.
InputFormat	convertFromTable(ResolvedExternalTable table) Create an input format from a resolved catalog table spec.
protected abstract Class<? extends InputFormat>	inputFormatClass() The target input format class for Jackson conversions.
List<TableFunction.ParameterDefn>	parameters() Obtain the parameters used to fully define an input format in a SQL function that defines an external table from scratch.
void	validate(ResolvedExternalTable table) Given a resolved table that has the serialized JSON converted to a Java map, validate the values of that map, typically by converting that map the target input format object (after adjustments and filling in dummy columns.) THe goal is to validate the information the user has provided in the table spec.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.druid.catalog.model.table.InputFormatDefn

convertFromArgs, typeValue

Constructor Detail

BaseFormatDefn

public BaseFormatDefn(List<TableFunction.ParameterDefn> parameters)

Method Detail

parameters

public List<TableFunction.ParameterDefn> parameters()

Description copied from interface: InputFormatDefn

Obtain the parameters used to fully define an input format in a SQL function that defines an external table from scratch. Note that the final list of table function arguments combines parameters from all the various input sources. It is legal for multiple formats to define the same parameter, as long as both definitions are of the same type.

Specified by:

parameters in interface InputFormatDefn

Returns:

inputFormatClass

protected abstract Class<? extends InputFormat> inputFormatClass()

The target input format class for Jackson conversions.

validate

public void validate(ResolvedExternalTable table)

Description copied from interface: InputFormatDefn

Given a resolved table that has the serialized JSON converted to a Java map, validate the values of that map, typically by converting that map the target input format object (after adjustments and filling in dummy columns.) THe goal is to validate the information the user has provided in the table spec. The final format information is validated elsewhere.

Specified by:

validate in interface InputFormatDefn

convertColumns

protected void convertColumns(Map<String,Object> jsonMap,
                              List<ColumnSpec> columns)

Convert columns from the ColumnSpec format used by the catalog to the list of names form requires by input formats.

convert

public InputFormat convert(Map<String,Object> jsonMap,
                           com.fasterxml.jackson.databind.ObjectMapper jsonMapper)

Convert a generic Java map of input format properties to an input format object.

convertFromTable

public InputFormat convertFromTable(ResolvedExternalTable table)

Description copied from interface: InputFormatDefn

Create an input format from a resolved catalog table spec. The format is given by the Java map within the given object.

Specified by:

convertFromTable in interface InputFormatDefn

Parameters:

table - resolved form of a table spec, with the format JSON parsed into a JSON map

Returns:

an input format as defined by the table spec