Mappings.TargetMapping (Apache Calcite API)

All Superinterfaces:

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

All Known Subinterfaces:

Mapping

All Known Implementing Classes:

AbstractSourceMapping, AbstractTargetMapping, Mappings.AbstractMapping, Mappings.FiniteAbstractMapping, Mappings.IdentityMapping, Mappings.InverseMapping, Mappings.OverridingSourceMapping, Mappings.OverridingTargetMapping, Mappings.PartialFunctionImpl, Mappings.PartialMapping, Mappings.SurjectionWithInverse, 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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getSourceCount()`
`int`	`getSourceOpt(int target)`
`int`	`getTarget(int target)`	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 Detail
  - getSourceCount
```
int getSourceCount()
```
    Specified by:
    
    getSourceCount in interface Mappings.FunctionMapping
  - getSourceOpt
```
int getSourceOpt(int target)
```
  - getTargetCount
```
int getTargetCount()
```
  - getTarget
```
int getTarget(int target)
```
    Description copied from interface: Mappings.FunctionMapping
    
    Returns the target that a source maps to.
    
    Specified by:
    
    getTarget in interface Mappings.FunctionMapping
    
    Parameters:
    
    target - source
    
    Returns:
    
    target
  - getTargetOpt
```
int getTargetOpt(int source)
```
    Description copied from interface: Mappings.FunctionMapping
    
    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()
```