org.apache.calcite.util.mapping

Class Mappings.SurjectionWithInverse

java.lang.Object

org.apache.calcite.util.mapping.Mappings.AbstractMapping

org.apache.calcite.util.mapping.Mappings.FiniteAbstractMapping

org.apache.calcite.util.mapping.Mappings.PartialMapping

org.apache.calcite.util.mapping.Mappings.SurjectionWithInverse

All Implemented Interfaces:

Iterable<IntPair>, Mapping, Mappings.CoreMapping, Mappings.FunctionMapping, Mappings.SourceMapping, Mappings.TargetMapping

Enclosing class:

Mappings

static class Mappings.SurjectionWithInverse
extends Mappings.PartialMapping

A surjection with inverse has precisely one source for each target. (Whereas a general surjection has at least one source for each target.) Every source has at most one target.

If you call set(int, int) on a target, the target's previous source will be lost.

Field Summary

Fields inherited from class org.apache.calcite.util.mapping.Mappings.PartialMapping

sources, targets

Constructor Summary

Constructors

Constructor and Description
SurjectionWithInverse(int sourceCount, int targetCount)

Method Summary

Modifier and Type	Method and Description
int	getSource(int target)
void	set(int source, int target) Creates a mapping between a source and a target.

Methods inherited from class org.apache.calcite.util.mapping.Mappings.PartialMapping

clear, getMappingType, getSourceCount, getSourceOpt, getTargetCount, getTargetOpt, inverse, isIdentity, isValid, iterator, size

Methods inherited from class org.apache.calcite.util.mapping.Mappings.FiniteAbstractMapping

equals, hashCode

Methods inherited from class org.apache.calcite.util.mapping.Mappings.AbstractMapping

getTarget, toString

Methods inherited from class java.lang.Object

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

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

getTarget

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

SurjectionWithInverse

SurjectionWithInverse(int sourceCount,
                      int targetCount)

Method Detail

set

public void set(int source,
                int target)

Creates a mapping between a source and a target.

It is an error to map a target to a source which already has a target.

If you map a source to a target which already has a source, the old source becomes an orphan.

Specified by:

set in interface Mappings.TargetMapping

Overrides:

set in class Mappings.PartialMapping

Parameters:

source - source

target - target

getSource

public int getSource(int target)

Specified by:

getSource in interface Mappings.SourceMapping

Overrides:

getSource in class Mappings.AbstractMapping