/** Creates a mapping with required properties. */
public static Mapping create(MappingType mappingType, int sourceCount, int targetCount) {
switch (mappingType) {
case BIJECTION:
assert sourceCount == targetCount;
return new Permutation(sourceCount);
case INVERSE_SURJECTION:
assert sourceCount >= targetCount;
return new SurjectionWithInverse(sourceCount, targetCount);
case PARTIAL_SURJECTION:
case SURJECTION:
return new Mappings.PartialMapping(sourceCount, targetCount, mappingType);
case PARTIAL_FUNCTION:
case FUNCTION:
return new PartialFunctionImpl(sourceCount, targetCount, mappingType);
case INVERSE_FUNCTION:
case INVERSE_PARTIAL_FUNCTION:
return new InverseMapping(create(mappingType.inverse(), targetCount, sourceCount));
default:
throw Util.needToImplement("no known implementation for mapping type " + mappingType);
}
}
public Mapping inverse() {
return new PartialMapping(targets.clone(), sources.clone(), mappingType.inverse());
}