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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.processor.graphQLProcessors;

import graphql.annotations.processor.ProcessingElementsContainer;
import graphql.annotations.processor.retrievers.GraphQLTypeRetriever;
import graphql.schema.GraphQLInputType;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.osgi.service.component.annotations.ReferencePolicyOption;

@Component(service = GraphQLInputProcessor.class)
public class GraphQLInputProcessor {

    private GraphQLTypeRetriever graphQLTypeRetriever;

    /**
     * This will examine the object class and return a {@link GraphQLInputType} representation
     *
     * @param object    the object class to examine
     * @param container a class that hold several members that are required in order to build schema
     * @return a {@link GraphQLInputType} that represents that object class
     */
    public GraphQLInputType getInputTypeOrRef(Class object, ProcessingElementsContainer container) {
        boolean considerAsInput = true;
        if (Enum.class.isAssignableFrom(object)) {
            considerAsInput = false;
        }
        return (GraphQLInputType) graphQLTypeRetriever.getGraphQLType(object, container, considerAsInput);
    }

    @Reference(policy = ReferencePolicy.DYNAMIC, policyOption = ReferencePolicyOption.GREEDY)
    public void setGraphQLTypeRetriever(GraphQLTypeRetriever graphQLTypeRetriever) {
        this.graphQLTypeRetriever = graphQLTypeRetriever;
    }

    public void unsetGraphQLTypeRetriever(GraphQLTypeRetriever graphQLTypeRetriever) {
        this.graphQLTypeRetriever = null;
    }

}