Package guru.mikelue.jdut.decorate

Defines the interface of decoration for DataGrain

The decoration

The DataGrainDecorator defines the lambda expression would be used to change data(or schema) of a DataRow.

DataFieldDecorator is a fine-grained extension of decorator for every field.

TableSchemaLoadingDecorator

The dependency of DataConductor, this decorator would load schema of database before a DataRow is going to be operated.

ReplaceFieldDataDecorator

You may replace a value of field with another value by certain condition(the Predicate over DataField).

Default value for null

The predicate of DataFieldPredicates::nullValue could be used as condition for replacing null value.

Side effects to Supplier of field data

If you don't want to evaluate the lambda expression, which provides value of a field, you could uses DataFieldPredicates.nonSupplier(guru.mikelue.jdut.datagrain.DataField<?>) to prevent the evaluation until the real needing for that field.

Interface Summary

Interface	Description
DataFieldDecorator	Likes DataFieldDecorator, with iteration of data fields.
DataGrainDecorator	This interface should be used with DataGrain.decorate(guru.mikelue.jdut.decorate.DataGrainDecorator).

Class Summary

Class	Description
ReplaceFieldDataDecorator	Builds the replacement by Predicate of DataField.
TableSchemaLoadingDecorator	Loads database schema and validating rows. To improve performance, this object would cache SchemaTable by its name, but this class is thread-safe for the caching mechanism.