org.eigenbase.util.mapping
Class Mappings

java.lang.Object
  org.eigenbase.util.mapping.Mappings

public abstract class Mappings
extends Object

Utility functions related to mappings.

Since:

Mar 24, 2006

Version:

$Id: //open/dev/farrago/src/org/eigenbase/util/mapping/Mappings.java#10 $

Author:

jhyde

See Also:

MappingType, Mappings.FunctionMapping, Permutation

Nested Class Summary

static class	Mappings.AbstractMapping
static class	Mappings.FiniteAbstractMapping
static interface	Mappings.FunctionMapping Mapping where every source has a target.
(package private) static class	Mappings.FunctionMappingIter
static class	Mappings.IdentityMapping
private static class	Mappings.InverseMapping Decorator which converts any Mapping into the inverse of itself.
static class	Mappings.NoElementException Thrown when a mapping is expected to return one element but returns none.
static class	Mappings.OverridingSourceMapping
static class	Mappings.OverridingTargetMapping
private static class	Mappings.PartialFunctionImpl Implementation of Mapping where a source can have at most one target, and a target can have any number of sources.
static class	Mappings.PartialMapping A mapping where a source at most one target, and every target has at most one source.
static interface	Mappings.SourceMapping Mapping suitable for sourcing columns.
(package private) static class	Mappings.SurjectionWithInverse A surjection with inverse has precisely one source for each target.
static interface	Mappings.TargetMapping Mapping suitable for mapping columns to a target.
static class	Mappings.TooManyElementsException Thrown when a mapping is expected to return one element but returns several.

Constructor Summary

private

Mappings()

Method Summary

static Mapping

create(MappingType mappingType, int sourceCount, int targetCount) Creates a mapping with required properties.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Mappings

private Mappings()

Method Detail

create

public static Mapping create(MappingType mappingType,
                             int sourceCount,
                             int targetCount)

Creates a mapping with required properties.