org.apache.calcite.adapter.elasticsearch

Class ElasticsearchEnumerator

java.lang.Object

org.apache.calcite.adapter.elasticsearch.ElasticsearchEnumerator

All Implemented Interfaces:

AutoCloseable, Enumerator<Object>

public class ElasticsearchEnumerator
extends Object
implements Enumerator<Object>

Enumerator that reads from an Elasticsearch type.

Field Summary

Fields

Modifier and Type	Field and Description
private Object	current
private Iterator<org.elasticsearch.search.SearchHit>	cursor
private Function1<org.elasticsearch.search.SearchHit,Object>	getter

Constructor Summary

Constructors

Constructor and Description
ElasticsearchEnumerator(Iterator<org.elasticsearch.search.SearchHit> cursor, Function1<org.elasticsearch.search.SearchHit,Object> getter) Creates an ElasticsearchEnumerator.

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
private static Object	convert(Object o, Class clazz)
Object	current()
(package private) static Function1<org.elasticsearch.search.SearchHit,Object>	getter(List<Map.Entry<String,Class>> fields)
private static Function1<org.elasticsearch.search.SearchHit,Object[]>	listGetter(List<Map.Entry<String,Class>> fields) Function that extracts a given set of fields from SearchHit objects.
private static Function1<org.elasticsearch.search.SearchHit,Map>	mapGetter()
boolean	moveNext()
void	reset()
private static Function1<org.elasticsearch.search.SearchHit,Object>	singletonGetter(String fieldName, Class fieldClass)

Methods inherited from class java.lang.Object

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

Field Detail

cursor

private final Iterator<org.elasticsearch.search.SearchHit> cursor

getter

private final Function1<org.elasticsearch.search.SearchHit,Object> getter

current

private Object current

Constructor Detail

ElasticsearchEnumerator

public ElasticsearchEnumerator(Iterator<org.elasticsearch.search.SearchHit> cursor,
                       Function1<org.elasticsearch.search.SearchHit,Object> getter)

Creates an ElasticsearchEnumerator.

Parameters:

cursor - Iterator over Elasticsearch SearchHit objects

getter - Converts an object into a list of fields

Method Detail

current

public Object current()

Specified by:

current in interface Enumerator<Object>

moveNext

public boolean moveNext()

Specified by:

moveNext in interface Enumerator<Object>

reset

public void reset()

Specified by:

reset in interface Enumerator<Object>

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Enumerator<Object>

mapGetter

private static Function1<org.elasticsearch.search.SearchHit,Map> mapGetter()

singletonGetter

private static Function1<org.elasticsearch.search.SearchHit,Object> singletonGetter(String fieldName,
                                                                   Class fieldClass)

listGetter

private static Function1<org.elasticsearch.search.SearchHit,Object[]> listGetter(List<Map.Entry<String,Class>> fields)

Function that extracts a given set of fields from SearchHit objects.

Parameters:

fields - List of fields to project

getter

static Function1<org.elasticsearch.search.SearchHit,Object> getter(List<Map.Entry<String,Class>> fields)

convert

private static Object convert(Object o,
             Class clazz)