Mappings.TargetMapping (Apache Calcite API)

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

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 java.lang.Iterable
forEach, iterator, spliterator

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

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

Method Details
- 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()