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Annotations-based syntax for GraphQL schema definition

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/**
 * Copyright 2016 Yurii Rashkovskii
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 */
package graphql.annotations.directives;

import graphql.annotations.annotationTypes.GraphQLDirectives;
import graphql.annotations.processor.ProcessingElementsContainer;
import graphql.annotations.processor.exceptions.GraphQLAnnotationsException;
import graphql.schema.GraphQLDirective;

import java.lang.reflect.AnnotatedElement;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;

public class DirectiveWiringMapRetriever {
    public HashMap getDirectiveWiringMap(AnnotatedElement object, ProcessingElementsContainer container) {
        GraphQLDirectives directivesContainer = object.getAnnotation(GraphQLDirectives.class);
        LinkedHashMap map = new LinkedHashMap<>();
        if (directivesContainer == null) return map;
        Arrays.stream(directivesContainer.value()).sequential().forEach(x -> {
            if (!container.getDirectiveRegistry().containsKey(x.name())) {
                throw new GraphQLAnnotationsException(String.format("No directive named %s is found in the directive registry", x.name()), null);
            }
            try {
                map.put(container.getDirectiveRegistry().get(x.name()), x.wiringClass().newInstance());
            } catch (InstantiationException | IllegalAccessException e) {
                throw new GraphQLAnnotationsException("Cannot create an instance of the wiring class " + x.wiringClass().getSimpleName(), e);
            }
        });
        return map;
    }

}