Mappings.FunctionMapping (Apache Calcite API)

All Superinterfaces:

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

All Known Subinterfaces:

Mapping, Mappings.TargetMapping

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.FunctionMapping
extends Mappings.CoreMapping
```
Mapping where every source has a target. But:
- A target may not have a source.
- May not be finite.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`MappingType`	`getMappingType()`	Returns the mapping type.
`int`	`getSourceCount()`
`int`	`getTarget(int source)`	Returns the target that a source maps to.
`int`	`getTargetOpt(int source)`	Returns the target that a source maps to, or -1 if it is not mapped.

Methods inherited from interface java.lang.Iterable
forEach, iterator, spliterator

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

- Method Detail
  - getTargetOpt
```
int getTargetOpt(int source)
```
    Returns the target that a source maps to, or -1 if it is not mapped.
  - getTarget
```
int getTarget(int source)
```
    Returns the target that a source maps to.
    
    Parameters:
    
    source - source
    
    Returns:
    
    target
    
    Throws:
    
    Mappings.NoElementException - if source is not mapped
  - getMappingType
```
MappingType getMappingType()
```
    Description copied from interface: Mappings.CoreMapping
    
    Returns the mapping type.
    
    Specified by:
    
    getMappingType in interface Mappings.CoreMapping
    
    Returns:
    
    Mapping type
  - getSourceCount
```
int getSourceCount()
```