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relay.js-compatible GraphQL servlet

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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.servlet;

import graphql.execution.ExecutionStrategy;
import graphql.schema.GraphQLObjectType;
import graphql.schema.GraphQLSchema;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;

/**
 * @author Andrew Potter
 */
public class SimpleGraphQLServlet extends GraphQLServlet {

    /**
     * Workaround for https://github.com/graphql-java/graphql-java/issues/345
     */
    public static final GraphQLObjectType EMPTY_MUTATION_TYPE = GraphQLObjectType.newObject()
        .name("Mutation")
        .build();

    public SimpleGraphQLServlet(GraphQLSchema schema, ExecutionStrategy executionStrategy) {
        this(schema, executionStrategy, null, null);
    }

    public SimpleGraphQLServlet(GraphQLSchema schema, ExecutionStrategy executionStrategy, List operationListeners, List servletListeners) {
        super(operationListeners, servletListeners, null);

        this.schema = schema;
        this.readOnlySchema = new GraphQLSchema(schema.getQueryType(), EMPTY_MUTATION_TYPE, schema.getDictionary());

        this.executionStrategy = executionStrategy;
    }

    private final GraphQLSchema schema;
    private final GraphQLSchema readOnlySchema;
    private final ExecutionStrategy executionStrategy;

    @Override
    public GraphQLSchema getSchema() {
        return schema;
    }

    @Override
    public GraphQLSchema getReadOnlySchema() {
        return readOnlySchema;
    }

    @Override
    protected GraphQLContext createContext(Optional request, Optional response) {
        return new GraphQLContext(request, response);
    }

    @Override
    protected ExecutionStrategy getExecutionStrategy() {
        return executionStrategy;
    }

    @Override
    protected Map transformVariables(GraphQLSchema schema, String query, Map variables) {
        return variables;
    }
}