com.tvd12.ezyhttp.server.graphql.GraphQLDataFetcher Maven / Gradle / Ivy

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package com.tvd12.ezyhttp.server.graphql;

import com.tvd12.ezyfox.exception.EzyNotImplementedException;
import com.tvd12.ezyfox.reflect.EzyGenerics;
import com.tvd12.ezyhttp.server.graphql.annotation.GraphQLQuery;

public interface GraphQLDataFetcher {

    D getData(A argument);

    default String getQueryName() {
        if (getClass().isAnnotationPresent(GraphQLQuery.class)) {
            return getClass().getAnnotation(GraphQLQuery.class).name();
        }
        throw new EzyNotImplementedException("you must implement " +
            getClass().getName() +
            ".getQueryName() method or annotated the class with @GraphQLQuery"
        );
    }

    default Class getArgumentType() {
        try {
            Class readerClass = getClass();
            Class[] args = EzyGenerics.getGenericInterfacesArguments(
                readerClass,
                GraphQLDataFetcher.class,
                2
            );
            return args[0];
        } catch (Exception e) {
            return null;
        }
    }
}