Class ConcreteTypeMigration

Migration from base type to multiple concrete types based on object's field values. If you need to migrate only by single field you can use simplified ConcreteTypeMigration<TDiscriminator>.

Inheritance
System.Object
ClassMigrationBase
InstanceMigration
ConcreteTypeMigration
ConcreteTypeMigration<TDiscriminator>
Inherited Members
Namespace: Eco.Core.Serialization.Migrations
Assembly: Eco.Core.dll
Syntax
public class ConcreteTypeMigration : InstanceMigration, IInstanceMigration, IReferenceMigration, IClassMigration, IMigration

Constructors

ConcreteTypeMigration(String, IEnumerable<String>, Func<ReaderDataInput[], String>)

Initializes a new instance of the ConcreteTypeMigration class. It will convert every class of baseTypeName into more specific (concrete) type using fieldNames (members of the object). For every migrated object it will invoke typeMapper with array of ReaderDataInput for fieldNames in same order and the function should return new type name.

Declaration
public ConcreteTypeMigration(string baseTypeName, IEnumerable<string> fieldNames, Func<ReaderDataInput[], string> typeMapper)
Parameters
Type Name Description
System.String baseTypeName
System.Collections.Generic.IEnumerable<System.String> fieldNames
System.Func<ReaderDataInput[], System.String> typeMapper

ConcreteTypeMigration(String, IEnumerable<String>, Func<Object[], String>)

Initializes a new instance of the ConcreteTypeMigration class. It will convert every class of baseTypeName into more specific (concrete) type using field values of fieldNames. For every migrated object it will invoke typeMapper with array of values for fieldNames in same order and the function should return new type name.

Declaration
public ConcreteTypeMigration(string baseTypeName, IEnumerable<string> fieldNames, Func<object[], string> typeMapper)
Parameters
Type Name Description
System.String baseTypeName
System.Collections.Generic.IEnumerable<System.String> fieldNames
System.Func<System.Object[], System.String> typeMapper

Methods

MigrateInstance(MigrationContext)

Migrates an instance with provided context. It may modify context with one of following migration results:

  • ReferenceTypeName != null means that binary content was fully consumed and a reference should be serialized instead. It should contains the referenced object id in ReferenceId;
  • Schema modified and output schema is a class schema, it means that original class binary data was replaced with another class binary data and it should use new object serializer;
  • Schema modified and output schema is the cached serializer schema, it means that original binary content was consumed and object instance created and cached for upcoming deserialization call;
  • Schema modified, but output schema not class or cached object, it means that Reader contains compatible binary data. If reader wasn't modified then it will be reset to initial position.
  • Schema not modified, if Reader modified then it should be re-serialized with original serializer or just reset reader position otherwise.
Declaration
public override void MigrateInstance(MigrationContext context)
Parameters
Type Name Description
MigrationContext context
Overrides

Implements

Extension Methods