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java.lang.Object java.lang.Enum<MappingType> org.eigenbase.util.mapping.MappingType
public enum MappingType
Describes the type of a mapping, from the most general MultiFunction
(every element in the source and target domain can participate in many
mappings) to the most retricted Bijection
(every element in the
source and target domain must be paired with precisely one element in the
other domain).
Some common types:
Once you know what type of mapping you want, call Mappings.create(MappingType, int, int)
to create an efficient implementation
of that mapping.
Enum Constant Summary  

Bijection


Eleven


Fourteen


Function


Injection


InverseFunction
An inverse function has a source for every target, but a source might have 0, 1 or more targets. 

InverseInjection


InversePartialFunction


InversePartialInjection


InverseSurjection
An inverse surjection has a source for every target, and no source has more than one target. 

MultiFunction


PartialFunction


PartialInjection


PartialSurjection
A partial surjection has no more than one source for any target, and no more than one target for any source. 

Surjection


Ten

Field Summary  

private int 
inverseOrdinal

private static int 
MultipleSource
Allow more than one source for a given target. 
private static int 
MultipleTarget
Allow more than one target for a given source. 
private static int 
OptionalSource
Allow less than one source for a given target. 
private static int 
OptionalTarget
Allow less than one target for a given source. 
Method Summary  

MappingType 
inverse()

boolean 
isA(MappingType mappingType)
Returns whether this mapping type is (possibly a weaker form of) a given mapping type. 
boolean 
isBijection()
A mapping is a bijection if it is a surjection and it is an injection. 
boolean 
isFunction()
A mapping is a total function if every source has precisely one target. 
boolean 
isInjection()
A mapping is an injection if it is a function and no target has more than one source. 
boolean 
isMandatorySource()
Constraint that every target has at least one source. 
boolean 
isMandatoryTarget()
Constraint that every source has at least one target. 
boolean 
isPartialFunction()
A mapping is a partial function if every source has at most one target. 
boolean 
isSingleSource()
Constraint that every target has at most one source. 
boolean 
isSingleTarget()
Constraint that every source has at most one target. 
boolean 
isSurjection()
A mapping is a surjection if it is a function and every target has at least one source. 
static MappingType 
valueOf(String name)
Returns the enum constant of this type with the specified name. 
static MappingType[] 
values()
Returns an array containing the constants of this enum type, in the order they're declared. 
Methods inherited from class java.lang.Enum 

clone, compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf 
Methods inherited from class java.lang.Object 

finalize, getClass, notify, notifyAll, wait, wait, wait 
Enum Constant Detail 

public static final MappingType Bijection
public static final MappingType Surjection
public static final MappingType Injection
public static final MappingType Function
public static final MappingType InverseSurjection
public static final MappingType PartialSurjection
public static final MappingType PartialInjection
public static final MappingType PartialFunction
public static final MappingType InverseInjection
public static final MappingType InversePartialInjection
public static final MappingType Ten
public static final MappingType Eleven
public static final MappingType InverseFunction
Obeys the constaints isMandatorySource()
, isSingleSource()
.
Similar types:
InverseSurjection
is stronger (a source may not have
multiple targets);
InversePartialFunction
is weaker (a target may have 0 or 1
sources).
public static final MappingType InversePartialFunction
public static final MappingType Fourteen
public static final MappingType MultiFunction
Field Detail 

private final int inverseOrdinal
private static final int OptionalSource
private static final int MultipleSource
private static final int OptionalTarget
private static final int MultipleTarget
Method Detail 

public static final MappingType[] values()
for(MappingType c : MappingType.values()) System.out.println(c);
public static MappingType valueOf(String name)
name
 the name of the enum constant to be returned.
IllegalArgumentException
 if this enum type has no constant
with the specified namepublic MappingType inverse()
public boolean isA(MappingType mappingType)
For example, a Bijection
is a Function
, but not
every {link #Function} is a Bijection
.
public boolean isFunction()
public boolean isPartialFunction()
public boolean isSurjection()
public boolean isInjection()
public boolean isBijection()
public boolean isMandatoryTarget()
public boolean isSingleTarget()
public boolean isMandatorySource()
public boolean isSingleSource()


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