Snippet

Complex Data Transformation with GenericConverter

GenericConverter is the most flexible interface in Spring's conversion system. Unlike simple converters, it provides TypeDescriptors, enabling logic that depends on generic type information or field annotations, crucial for complex data binding.

snippet.java

java

public class CollectionToReportConverter implements GenericConverter {
    @Override
    public Set<ConvertiblePair> getConvertibleTypes() {
        return Collections.singleton(new ConvertiblePair(Collection.class, Report.class));
    }
 
    @Override
    public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
        Collection<?> list = (Collection<?>) source;
        // Sophisticated logic using TypeDescriptor to inspect generic parameters
        return new Report(list.size(), sourceType.getElementTypeDescriptor().getType());
    }
}

spring

Breakdown

getConvertibleTypes()

Defines the supported source-to-target mapping pairs for this converter.

sourceType.getElementTypeDescriptor()

Allows inspection of the generic component type (e.g., T in List<T>) for advanced mapping logic.

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Complex Data Transformation with GenericConverter

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