org.apache.calcite.adapter.cassandra

Class CassandraEnumerator

java.lang.Object

org.apache.calcite.adapter.cassandra.CassandraEnumerator

All Implemented Interfaces:

AutoCloseable, Enumerator<Object>

class CassandraEnumerator
extends Object
implements Enumerator<Object>

Enumerator that reads from a Cassandra column family.

Field Summary

Fields

Modifier and Type	Field and Description
private com.datastax.driver.core.Row	current
private List<RelDataTypeField>	fieldTypes
private Iterator<com.datastax.driver.core.Row>	iterator

Constructor Summary

Constructors

Constructor and Description
CassandraEnumerator(com.datastax.driver.core.ResultSet results, RelProtoDataType protoRowType) Creates a CassandraEnumerator.

Method Summary

Modifier and Type	Method and Description
void	close()
Object	current() Produce the next row from the results
private Object	currentRowField(int index, SqlTypeName typeName) Get a field for the current row from the underlying object.
boolean	moveNext()
void	reset()

Methods inherited from class java.lang.Object

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

Field Detail

iterator

private Iterator<com.datastax.driver.core.Row> iterator

current

private com.datastax.driver.core.Row current

fieldTypes

private List<RelDataTypeField> fieldTypes

Constructor Detail

CassandraEnumerator

public CassandraEnumerator(com.datastax.driver.core.ResultSet results,
                           RelProtoDataType protoRowType)

Creates a CassandraEnumerator.

Parameters:

results - Cassandra result set (ResultSet)

protoRowType - The type of resulting rows

Method Detail

current

public Object current()

Produce the next row from the results

Specified by:

current in interface Enumerator<Object>

Returns:

A new row from the results

currentRowField

private Object currentRowField(int index,
                               SqlTypeName typeName)

Get a field for the current row from the underlying object.

Parameters:

index - Index of the field within the Row object

typeName - Type of the field in this row

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>