Module com.darkcollective.relix.processor

Package com.darkcollective.relix.processor.generator

Class GeneratorDataSourceConnector

java.lang.Object

com.darkcollective.relix.processor.generator.GeneratorDataSourceConnector

All Implemented Interfaces:

DataSourceConnector, AutoCloseable

public final class GeneratorDataSourceConnector
extends Object
implements DataSourceConnector

A DataSourceConnector that serves generator relations — leaves whose rows are produced by engine code.

For a relation declared as source R from generator { name: "Range", … }, this resolves the relation's GeneratorSourceConfig (from SemanticModel.sources()), looks up the named Generator in the GeneratorRegistry, and returns its lazy Stream<Row>. Argument validation is the generator's responsibility and surfaces here at open time.

Constructor Summary

Constructors

Constructor	Description
GeneratorDataSourceConnector(SemanticModel model, GeneratorRegistry registry)

Method Summary

Modifier and Type	Method	Description
Stream<Row>	open(String relationName, Schema schema)	Opens a stream of rows for the named relation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.darkcollective.relix.processor.internal.DataSourceConnector

close, openQuery, openQuery

Constructor Details

GeneratorDataSourceConnector

public GeneratorDataSourceConnector(SemanticModel model,
 GeneratorRegistry registry)

Parameters:

model - the semantic model whose sources declare each generator relation

registry - the catalogue of built-in generators

Method Details

open

public Stream<Row> open(String relationName,
 Schema schema)

Description copied from interface: DataSourceConnector

Opens a stream of rows for the named relation.

Specified by:

open in interface DataSourceConnector

Parameters:

relationName - the canonical (lower-cased) relation name

schema - the expected schema; may be used to map source columns to the correct positions and types

Returns:

a stream of rows; the caller is responsible for closing it