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ClosestExtFieldsCollisionHandler

This class is used in creating the cube selection. It is used to improve the collision handler feature.

Here is the basic usage sample:

IDatastoreSchemaDescription description;
ISelectionDescription selection = StartBuilding.selection(description)
        .fromBaseStore("BaseStore")
        .withAllReachableFields(ClosestExtFieldsCollisionHandler.INSTANCE)
        .build();

The collision handler resolves the duplicate field issue on the selection. By default, the field name is the store field name.

Compared to the core collision handler, this handler:

uses the field with the shortest path.
renames the collided fields if they are at the same level, by default the new name will be “reference_field”.
uses specific configuration rules.

This collision handler has several configuration methods that can be called in a fluent way.

API

Method	Fields	Meaning
withAlias	fieldPath, alias	Set a naming rule for a field path. If found, this field will be given the name set as the alias.
withReferenceAlias	referenceName, alias	Renames a reference to another alias name. This is used in case of a conflict in renaming the collided fields.

Examples

Default behavior

/TestBaseToTradeAttributes/TradeAttributesToCounterparties/Stuff => TradeAttributesToCounterparties_Stuff
/TestBaseToTradeAttributes/TradeAttributesToBookHierarchy/Stuff => TradeAttributesToBookHierarchy_Stuff

withAlias

withAlias("TradeAttributesToCounterparties/Stuff", "C_Stuff")

/TestBaseToTradeAttributes/TradeAttributesToCounterparties/Stuff => C_Stuff
/TestBaseToTradeAttributes/TradeAttributesToBookHierarchy/Stuff => Stuff

withAlias("Book", "MyBook")

/TestBaseToTradeAttributes/TradeAttributesToBookHierarchy/Book => Book
/Book => MyBook

withReferenceAlias

withReferenceAlias("TradeAttributesToBookHierarchy", "Book")

/TestBaseToTradeAttributes/TradeAttributesToCounterparties/Stuff => TradeAttributesToCounterparties_Stuff
/TestBaseToTradeAttributes/TradeAttributesToBookHierarchy/Stuff => Book_Stuff