org.apache.calcite.util.mapping

Interface Mappings.SourceMapping

All Superinterfaces:

Iterable<IntPair>, Mappings.CoreMapping

All Known Subinterfaces:

Mapping

All Known Implementing Classes:

AbstractSourceMapping, AbstractTargetMapping, Mappings.AbstractMapping, Mappings.FiniteAbstractMapping, Mappings.IdentityMapping, Mappings.OverridingSourceMapping, Mappings.OverridingTargetMapping, Mappings.PartialMapping, Permutation

Enclosing class:

Mappings

public static interface Mappings.SourceMapping
extends Mappings.CoreMapping

Mapping suitable for sourcing columns.

Properties:

• It has a finite number of sources and targets
• Each target has exactly one source
• Each source has at most one target

TODO: figure out which interfaces this should extend

Method Summary

Modifier and Type	Method and Description
MappingType	getMappingType() Returns the mapping type.
int	getSource(int target) Returns the source that a target maps to.
int	getSourceCount()
int	getSourceOpt(int target) Returns the source that a target maps to, or -1 if it is not mapped.
int	getTargetCount()
int	getTargetOpt(int source) Returns the target that a source maps to, or -1 if it is not mapped.
Mapping	inverse()
boolean	isIdentity()

Methods inherited from interface org.apache.calcite.util.mapping.Mappings.CoreMapping

size

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

Method Detail

getSourceCount

int getSourceCount()

getSource

int getSource(int target)

Returns the source that a target maps to.

Parameters:

target - target

Returns:

source

Throws:

Mappings.NoElementException - if target is not mapped

getSourceOpt

int getSourceOpt(int target)

Returns the source that a target maps to, or -1 if it is not mapped.

getTargetCount

int getTargetCount()

getTargetOpt

int getTargetOpt(int source)

Returns the target that a source maps to, or -1 if it is not mapped.

getMappingType

MappingType getMappingType()

Description copied from interface: Mappings.CoreMapping

Returns the mapping type.

Specified by:

getMappingType in interface Mappings.CoreMapping

Returns:

Mapping type

isIdentity

boolean isIdentity()

inverse

Mapping inverse()