Converter
A converter is a component or operation that transforms data, values, or objects from one type or representation into another.
Java Persistence with Spring Data and Hibernate epub
A custom type converter is application-defined conversion logic that translates values between a domain type and a persistence representation.
- How it is used
- Maps rich entity-attribute values to database representations when the domain model and available schema differ.
- How deep it goes
- Shows property configuration and both conversion directions, then considers nested attributes and a later change to embeddable mapping.
- Examples
- Uses a monetary amount stored as a currency-bearing string and a zipcode reconstructed as a country-specific subclass.
- What you can do after
- Build it from scratch with AttributeConverter and @Convert to store and reload a domain value through one column.
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Kafka Streams in Action, Second Edition
A converter is a Kafka Connect component that changes data between Connect's internal representation and a serialization format used by Kafka or an external system.
- How it is used
- Configures Kafka Connect to serialize keys and values entering Kafka or deserialize them for external systems.
- How deep it goes
- Defines conversion direction and key/value settings, but stops short of implementing a custom converter.
- Examples
- Uses StringConverter for keys, JsonConverter for values, and a JDBC source connector with schemas disabled.
- What you can do after
- Operate/configure Kafka Connect converters through worker defaults, connector overrides, and key/value serialization settings.
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Spring in Action, Sixth Edition
A Spring Converter is a class implementing the Converter interface to transform a value from one type into another during data binding.
- How it is used
- Bridges submitted form values and domain objects during Spring MVC data binding.
- How deep it goes
- Explains interface implementation, lookup logic, bean discovery, and automatic registration, but defers database-backed conversion.
- Examples
- Uses taco ingredient checkboxes, ingredient IDs, a Map lookup, and IngredientByIdConverter as concrete implementation artifacts.
- What you can do after
- Build it from scratch by implementing Converter<String, Ingredient> and registering the class as a Spring component.
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ASP.NET Core in Action, 3e
A type converter is a .NET conversion component or convention that converts values between specified types, including converting textual input to another type.
- How it is used
- Converts string request values while Razor Pages model binding supplies handler parameters.
- How deep it goes
- Identifies primitive types, TryParse, and TypeConverter as supported paths without detailing converter implementation.
- Examples
- Uses a Razor Page handler that accepts an integer number and calculates its square.
- What you can do after
- Apply model binding to receive converted primitive values and recognize custom types supported by TryParse or TypeConverter.
Related concepts
- source connectorused by · A source connector is a Kafka Connect connector that reads data from an external source system and publishes records to Kafka.
- single message transformationused by · A single message transformation is a stateless Kafka Connect operation that independently modifies or filters each record passing through a connector.
- sink connectorused by · A sink connector is a Kafka Connect connector that reads records from Kafka and exports them to an external destination system.
- to_symincludes · to_sym is a Ruby conversion method that returns a symbol corresponding to a value's textual representation.
- to_sincludes · to_s is a Ruby conversion method that returns a string representation of its receiver.
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