Generally, the recommended way to implement a type converter is to use an annotated class, as described in the previous section, Implementing Type Converter Using Annotations. But if you want to have complete control over the registration of your type converter, you can implement a custom slave type converter and add it directly to the type converter registry, as described here.
To implement your own type converter class, define a class that implements the
TypeConverter
interface. For example, the following
MyOrderTypeConverter
class converts an integer value to a
MyOrder
object, where the integer value is used to initialize the order ID in
the MyOrder
object.
import org.apache.camel.TypeConverter private class MyOrderTypeConverter implements TypeConverter { public <T> T convertTo(Class<T> type, Object value) { // converter from value to the MyOrder bean MyOrder order = new MyOrder(); order.setId(Integer.parseInt(value.toString())); return (T) order; } public <T> T convertTo(Class<T> type, Exchange exchange, Object value) { // this method with the Exchange parameter will be preferd by Camel to invoke // this allows you to fetch information from the exchange during convertions // such as an encoding parameter or the likes return convertTo(type, value); } public <T> T mandatoryConvertTo(Class<T> type, Object value) { return convertTo(type, value); } public <T> T mandatoryConvertTo(Class<T> type, Exchange exchange, Object value) { return convertTo(type, value); } }
You can add the custom type converter directly to the type converter registry using code like the following:
// Add the custom type converter to the type converter registry context.getTypeConverterRegistry().addTypeConverter(MyOrder.class, String.class, new MyOrderTypeConverter());
Where context
is the current org.apache.camel.CamelContext
instance. The addTypeConverter()
method registers the
MyOrderTypeConverter
class against the specific type conversion, from
String.class
to MyOrder.class
.