95 lines
2.3 KiB
Plaintext
95 lines
2.3 KiB
Plaintext
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= Mapping model
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[plantuml,SqmTypeSystem,png]
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.Mapping type system
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....
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@startuml
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skinparam handwritten true
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interface MappingType
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interface ValueMapping
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interface BasicType
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interface ModelPart
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interface ModelPartContainer
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MappingType <|--
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ValueMapping <|-- BasicType
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ValueMapping <|-- ModelPart
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ModelPartContainer <|-- EntityMapping
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ModelPartContainer <|-- EmbeddableMapping
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ModelPart <|-- EmbeddableMapping
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ModelPart <|-- AttributeMapping
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ModelPart <|-- EntityIdentifierMapping
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ModelPart <|-- EntityVersionMapping
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ModelPart <|-- EntityDiscriminatorMapping
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@enduml
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....
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[source,JAVA]
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----
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interface ValueMapping {
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Type getMappingType();
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<X> X getCapability(Class<X> capabilityType);
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...
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}
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interface ModelPart extends ValueMapping {
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<T> DomainResult<T> createDomainResult(...);
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void applySqlSelections(...);
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...
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}
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interface ModelPartContainer extends ValueMapping {
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void visitSubMappings(Consumer<ModelPart> action);
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ModelPart findSubPart(String name);
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ModelPart resolveSubPart(String path);
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}
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interface EntityMapping extends ModelPartContainer {
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default EntityPersister getEntityPersister() {
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return getCapability( EntityPersister.class );
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}
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default EntityIdentifierMapping getIdentifierMapping() {
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return getCapability( EntityIdentifierMapping.class );
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}
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default EntityVersionMapping getVersionMapping() {
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return getCapability( EntityVersionMapping.class );
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}
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default EntityDiscriminatorMapping getDiscriminatorMapping() {
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return getCapability( EntityDiscriminatorMapping.class );
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}
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...
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}
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interface EmbeddableMapping extends ModelPart, ModelPartContainer {
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...
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}
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----
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== Relationship with legacy "persister walking" SPI
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`org.hibernate.metamodel.model.mapping` contract corollaries in `org.hibernate.persister.walking`:
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EntityMapping::EntityDefinition
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EmbeddableMapping::CompositionDefinition
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AttributeMapping::AttributeDefinition
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EntityIdentifierMapping::EntityIdentifierDefinition
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== AllowableParameterType
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`AllowableParameterType` is a contract that defines types that are valid for parameter binding in terms of an SQM query.
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AT some point this needs to be "resolved" to a ValueMapping/Type/Bindable when generating the SQL AST and executing.
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One option is to have the `AllowableParameterType` be resolved first to a `SqmExpressable`
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`SqmExpressableAllowableParameterType#resolveSqmExpressable`
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