Package org.apache.calcite.util.mapping

Support for algebraic maps.

Interface Summary

Interface	Description
Mapping	A Mapping is a relationship between a source domain to target domain of integers.
Mappings.CoreMapping	Core interface of all mappings.
Mappings.FunctionMapping	Mapping where every source has a target.
Mappings.SourceMapping	Mapping suitable for sourcing columns.
Mappings.TargetMapping	Mapping suitable for mapping columns to a target.

Class Summary

Class	Description
AbstractSourceMapping	Simple implementation of Mappings.TargetMapping where the number of sources and targets are specified as constructor parameters and you just need to implement one method,
AbstractTargetMapping	Simple implementation of Mappings.TargetMapping where the number of sources and targets are specified as constructor parameters and you just need to implement one method,
IntPair	An immutable pair of integers.
Mappings	Utility functions related to mappings.
Mappings.AbstractMapping	Abstract implementation of Mapping.
Mappings.FiniteAbstractMapping	Abstract implementation of mapping where both source and target domains are finite.
Mappings.FunctionMappingIter	Iterator that yields the (source, target) values in a Mappings.FunctionMapping.
Mappings.IdentityMapping	The identity mapping, of a given size, or infinite.
Mappings.InverseMapping	Decorator which converts any Mapping into the inverse of itself.
Mappings.OverridingSourceMapping	Source mapping that returns the same result as a parent Mappings.SourceMapping except for specific overriding elements.
Mappings.OverridingTargetMapping	Target mapping that returns the same result as a parent Mappings.TargetMapping except for specific overriding elements.
Mappings.PartialFunctionImpl	Implementation of Mapping where a source can have at most one target, and a target can have any number of sources.
Mappings.PartialMapping	A mapping where a source has at most one target, and every target has at most one source.
Mappings.SurjectionWithInverse	A surjection with inverse has precisely one source for each target.

Enum Summary

Enum	Description
MappingType	Describes the type of a mapping, from the most general MappingType.MULTI_FUNCTION (every element in the source and target domain can participate in many mappings) to the most retricted MappingType.BIJECTION (every element in the source and target domain must be paired with precisely one element in the other domain).

Exception Summary

Exception	Description
Mappings.NoElementException	Thrown when a mapping is expected to return one element but returns none.
Mappings.TooManyElementsException	Thrown when a mapping is expected to return one element but returns several.