org.apache.calcite.util.mapping

Interface Mappings.TargetMapping

All Superinterfaces:

Iterable<IntPair>, Mappings.CoreMapping, Mappings.FunctionMapping

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.TargetMapping
extends Mappings.FunctionMapping

Mapping suitable for mapping columns to a target.

Properties:

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

TODO: figure out which interfaces this should extend

Method Summary

Modifier and Type	Method and Description
int	getSourceCount()
int	getSourceOpt(int target) Returns the source that a target maps to, or -1 if it is not mapped.
int	getTarget(int source) Returns the target that a source maps to.
int	getTargetCount()
int	getTargetOpt(int source) Returns the target that a source maps to, or -1 if it is not mapped.
Mapping	inverse()
void	set(int source, int target)

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

getMappingType

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()

Specified by:

getSourceCount in interface Mappings.FunctionMapping

getSourceOpt

int getSourceOpt(int target)

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

getTargetCount

int getTargetCount()

getTarget

int getTarget(int source)

Returns the target that a source maps to.

Specified by:

getTarget in interface Mappings.FunctionMapping

Parameters:

source - source

Returns:

target

Throws:

Mappings.NoElementException - if source is not mapped

getTargetOpt

int getTargetOpt(int source)

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

Specified by:

getTargetOpt in interface Mappings.FunctionMapping

set

void set(int source,
         int target)

inverse

Mapping inverse()