Package org.apache.cassandra.cql3.selection

Class SelectionColumnMapping

java.lang.Object

org.apache.cassandra.cql3.selection.SelectionColumnMapping

All Implemented Interfaces:

SelectionColumns

public class SelectionColumnMapping
extends Object
implements SelectionColumns

Separately maintains the ColumnSpecifications and their mappings to underlying columns as we may receive null mappings. This occurs where a query result includes a column specification which does not map to any particular real column, e.g. COUNT queries or where no-arg functions like now() are used

Method Summary

Modifier and Type	Method	Description
protected SelectionColumnMapping	addMapping(ColumnSpecification colSpec, Iterable<ColumnMetadata> columns)
protected SelectionColumnMapping	addMapping(ColumnSpecification colSpec, ColumnMetadata column)
boolean	equals(Object obj)
List<ColumnSpecification>	getColumnSpecifications()
com.google.common.collect.Multimap<ColumnSpecification,ColumnMetadata>	getMappings()
int	hashCode()
protected static SelectionColumnMapping	newMapping()
protected static SelectionColumnMapping	simpleMapping(Iterable<ColumnMetadata> columnDefinitions)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Details

newMapping

protected static SelectionColumnMapping newMapping()

simpleMapping

protected static SelectionColumnMapping simpleMapping(Iterable<ColumnMetadata> columnDefinitions)

addMapping

protected SelectionColumnMapping addMapping(ColumnSpecification colSpec,
 ColumnMetadata column)

addMapping

protected SelectionColumnMapping addMapping(ColumnSpecification colSpec,
 Iterable<ColumnMetadata> columns)

getColumnSpecifications

public List<ColumnSpecification> getColumnSpecifications()

Specified by:

getColumnSpecifications in interface SelectionColumns

getMappings

public com.google.common.collect.Multimap<ColumnSpecification,ColumnMetadata> getMappings()

Specified by:

getMappings in interface SelectionColumns

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object