HLTech / vaunt

import com.fasterxml.jackson.databind.JsonMappingException;

import com.google.common.collect.ArrayListMultimap;

import com.google.common.collect.Multimap;

import com.hltech.vaunt.core.VauntSerializer;

import com.hltech.vaunt.core.domain.model.Capabilities;

import com.hltech.vaunt.core.domain.model.Contract;

import com.hltech.vaunt.core.domain.model.Expectations;

import com.hltech.vaunt.core.domain.model.Service;

import com.hltech.vaunt.generator.domain.representation.annotation.Consumer;

import com.hltech.vaunt.generator.domain.representation.annotation.Consumers;

import com.hltech.vaunt.generator.domain.representation.annotation.Provider;

import com.hltech.vaunt.generator.domain.representation.annotation.Providers;

import lombok.RequiredArgsConstructor;

import org.reflections.Reflections;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

@RequiredArgsConstructor

public class RepresentationExtractor {

    private final VauntSerializer serializer;

    public Service extractServiceRepresentation(String packageRoot, String serviceName) throws JsonMappingException {

        return new Service(serviceName, extractCapabilities(packageRoot), extractExpectations(packageRoot));

    }

    private Capabilities extractCapabilities(String packageRoot) {

        List<Contract> providerContracts = new ArrayList<>();

        new Reflections(packageRoot).getTypesAnnotatedWith(Providers.class)

                .forEach(providerMessage -> Arrays.stream(providerMessage.getAnnotation(Providers.class).value())

                        .forEach(providerAnnotation -> providerContracts.add(

                                extractProviderContract(providerMessage, providerAnnotation))));

        new Reflections(packageRoot).getTypesAnnotatedWith(Provider.class)

                .forEach(providerMessage -> providerContracts.add(

                        extractProviderContract(providerMessage, providerMessage.getAnnotation(Provider.class))));

        return new Capabilities(providerContracts);

    }

    private Expectations extractExpectations(String packageRoot) {

        Multimap<String, Contract> providerNameToContracts = ArrayListMultimap.create();

        new Reflections(packageRoot).getTypesAnnotatedWith(Consumers.class)

                .forEach(consumerMessage -> Arrays.stream(consumerMessage.getAnnotation(Consumers.class).value())

                        .forEach(consumerAnnotation -> providerNameToContracts.put(

                                consumerAnnotation.providerName(),

                                extractConsumerContract(consumerMessage, consumerAnnotation))));

        new Reflections(packageRoot).getTypesAnnotatedWith(Consumer.class)

                .forEach(consumerMessage -> providerNameToContracts.put(

                        consumerMessage.getAnnotation(Consumer.class).providerName(),

                        extractConsumerContract(consumerMessage, consumerMessage.getAnnotation(Consumer.class))));

        return new Expectations(providerNameToContracts);

    }

    }

    private Contract extractConsumerContract(Class<?> consumerMessage, Consumer consumerAnnotation) {

        try {

            return new Contract(

                    consumerAnnotation.destinationType(),

                    consumerAnnotation.destinationName(),

                    serializer.generateSchema(consumerMessage));

        } catch (JsonMappingException ex) {

            throw new RuntimeException("Unable to extract contract for given consumer", ex);

        }

    }

}