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relay.js-compatible GraphQL servlet

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package graphql.servlet;

import graphql.ExecutionInput;
import graphql.schema.GraphQLSchema;
import graphql.servlet.internal.GraphQLRequest;

import javax.security.auth.Subject;
import java.util.List;
import java.util.Optional;

/**
 * @author Andrew Potter
 */
public abstract class GraphQLInvocationInput {
    private final GraphQLSchema schema;
    private final GraphQLContext context;
    private final Object root;

    public GraphQLInvocationInput(GraphQLSchema schema, GraphQLContext context, Object root) {
        this.schema = schema;
        this.context = context;
        this.root = root;
    }

    public GraphQLSchema getSchema() {
        return schema;
    }

    public GraphQLContext getContext() {
        return context;
    }

    public Object getRoot() {
        return root;
    }

    public Optional getSubject() {
        return context.getSubject();
    }

    protected ExecutionInput createExecutionInput(GraphQLRequest graphQLRequest) {
        return new ExecutionInput(
            graphQLRequest.getQuery(),
            graphQLRequest.getOperationName(),
            context,
            root,
            graphQLRequest.getVariables()
        );
    }
}