package io.dropwizard.validation.valuehandling;
import com.fasterxml.classmate.ResolvedType;
import com.fasterxml.classmate.TypeResolver;
import com.google.common.base.Optional;
import org.hibernate.validator.spi.valuehandling.ValidatedValueUnwrapper;
import java.lang.reflect.Type;
/**
* A {@link ValidatedValueUnwrapper} for Guava's {@link Optional}.
* <p/>
* Extracts the value contained by the {@link Optional} for validation, or produces {@code null}.
*/
public class OptionalValidatedValueUnwrapper extends ValidatedValueUnwrapper<Optional<?>> {
private final TypeResolver resolver = new TypeResolver();
@Override
public Object handleValidatedValue(final Optional<?> optional) {
return optional.orNull();
}
@Override
public Type getValidatedValueType(final Type type) {
ResolvedType resolvedType = resolver.resolve(type);
return resolvedType.typeParametersFor(Optional.class).get(0).getErasedType();
}
}