Class MappingExamples

src/test/groovy/readme/MappingExamples.java:17–159

import static graphql.schema.FieldCoordinates.coordinates;

@SuppressWarnings({"Convert2Lambda", "unused", "ClassCanBeStatic"})
public class MappingExamples {

    interface ProductInfo {
        String getId();

        String getName();

        String getDescription();
    }

    interface ProductCostInfo {
        float getCost();
    }

    interface ProductTaxInfo {
        float getTax();
    }


    void productsDataFetcher() {

        DataFetcher productsDataFetcher = new DataFetcher() {
            @Override
            public Object get(DataFetchingEnvironment env) {
                String matchArg = env.getArgument("match");

                List<ProductInfo> productInfo = getMatchingProducts(matchArg);

                List<ProductCostInfo> productCostInfo = getProductCosts(productInfo);

                List<ProductTaxInfo> productTaxInfo = getProductTax(productInfo);

                return mapDataTogether(productInfo, productCostInfo, productTaxInfo);
            }
        };
    }

    private Object mapDataTogether(List<ProductInfo> productInfo, List<ProductCostInfo> productCostInfo, List<ProductTaxInfo> productTaxInfo) {
        return null;
    }

    private List<Map> mapDataTogetherViaMap(List<ProductInfo> productInfo, List<ProductCostInfo> productCostInfo, List<ProductTaxInfo> productTaxInfo) {
        List<Map> unifiedView = new ArrayList<>();
        for (int i = 0; i < productInfo.size(); i++) {
            ProductInfo info = productInfo.get(i);
            ProductCostInfo cost = productCostInfo.get(i);
            ProductTaxInfo tax = productTaxInfo.get(i);

            Map<String, Object> objectMap = new HashMap<>();
            objectMap.put("id", info.getId());
            objectMap.put("name", info.getName());
            objectMap.put("description", info.getDescription());
            objectMap.put("cost", cost.getCost());
            objectMap.put("tax", tax.getTax());

            unifiedView.add(objectMap);
        }