Class ElementConverter

java.lang.Object

org.incenp.linkml.core.converters.ObjectConverter

org.incenp.linkml.schema.ElementConverter

All Implemented Interfaces:

IConverter

Direct Known Subclasses:

ClassDefinitionConverter

public class ElementConverter
extends ObjectConverter

A converter object specifically intended to convert schema elements (i.e. Element objects).

We need a special converter because we must take into account that schema elements (class, slot, enumeration, and type definitions) in a given schema can be overridden by another schema depending on the position of each schema in the import chains.

The LinkML specification does not say how overriding should work – in fact, the specification explicitly says that multiple definitions of a single element across several schemas in the imports closure is an error and should be treated as such, so the question of which definition overrides another should be moot.

However LinkML-Py does not treat multiple definitions as errors, and instead has an explicit overriding logic to deal with them (logic that is only “documented” in a comment in the SchemaView code…). Presumably that logic is the expected behaviour.

The sole purpose of this converter is to check prior to convert an element object if the object is overridden from another schema, and if so skip conversion altogether.

Field Summary

Fields inherited from class ObjectConverter

klass, prefixExtractor

Constructor Summary

Constructors

Constructor	Description
ElementConverter(Class<? extends org.incenp.linkml.schema.model.Element> klass, SchemaProcessingContext context)	Creates a new converter for the specified type of element.
ElementConverter(Class<? extends org.incenp.linkml.schema.model.Element> klass, SchemaProcessingContext context, boolean checkOverriding)	Creates a new converter for the specified type of element.

Method Summary

Modifier and Type	Method	Description
void	convertTo(Map<String,Object> rawMap, Object dest, ConverterContext ctx)	Converts a raw map into an instance of a LinkML object, where the object already exists.
protected boolean	isOverridden(org.incenp.linkml.schema.model.Element element)	Checks whether the schema schema is overridden by another one about the given element.

Methods inherited from class ObjectConverter

convert, convert, convert, convertForSlot, convertTo, getGlobalIdentifier, getGlobalIdentifierList, getType, normaliseList, serialise, serialise, serialiseForSlot, serialiseInit, serialiseSlot, toIdentifier, toList, toMap

Methods inherited from class Object

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

Methods inherited from interface IConverter

getURI

Constructor Details

ElementConverter

public ElementConverter(Class<? extends org.incenp.linkml.schema.model.Element> klass,
 SchemaProcessingContext context)

Creates a new converter for the specified type of element.

Parameters:

klass - The type of element to convert.

context - The context for which elements are to be converted.

ElementConverter

public ElementConverter(Class<? extends org.incenp.linkml.schema.model.Element> klass,
 SchemaProcessingContext context,
 boolean checkOverriding)

Creates a new converter for the specified type of element.

Parameters:

klass - The type of element to convert.

context - The context for which elements are to be converted.

checkOverriding - If true, this class will not check whether a given element is overridden. This is intended to allow subclasses to perform this check themselves.

Method Details

convertTo

public void convertTo(Map<String,Object> rawMap,
 Object dest,
 ConverterContext ctx)
               throws LinkMLRuntimeException

Description copied from class: ObjectConverter

Converts a raw map into an instance of a LinkML object, where the object already exists.

Overrides:

convertTo in class ObjectConverter

Parameters:

rawMap - The raw map to convert.

dest - The instance of the LinkML object whose slots should be filled with values from the raw map.

ctx - The global converter context.

Throws:

LinkMLRuntimeException - If a slot of the dest object cannot be assigned.

isOverridden

protected boolean isOverridden(org.incenp.linkml.schema.model.Element element)
                        throws LinkMLRuntimeException

Checks whether the schema schema is overridden by another one about the given element.

If the current schema is found to override a prior definition (instead of being overridden itself), then this method ensures that the current schema takes precedence.

Parameters:

element - The element to check.

Returns:

true if the element is overridden, and therefore does not need to be processed any further.

Throws:

LinkMLRuntimeException - If an error occurs when deleting the prior definition, if any (this should never happen).