Mappings.SurjectionWithInverse (Apache Calcite API)

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:

java.lang.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 Description

SurjectionWithInverse(int sourceCount, int targetCount)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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 java.lang.Iterable
forEach, spliterator

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

- 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