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GraphqL Java
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package graphql.execution;


import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import graphql.ExecutionInput;
import graphql.GraphQLError;
import graphql.PublicApi;
import graphql.cachecontrol.CacheControl;
import graphql.collect.ImmutableMapWithNullValues;
import graphql.execution.instrumentation.Instrumentation;
import graphql.execution.instrumentation.InstrumentationState;
import graphql.language.Document;
import graphql.language.FragmentDefinition;
import graphql.language.OperationDefinition;
import graphql.normalized.NormalizedQueryTree;
import graphql.normalized.NormalizedQueryTreeFactory;
import graphql.schema.GraphQLSchema;
import graphql.util.FpKit;
import org.dataloader.DataLoaderRegistry;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Supplier;

@SuppressWarnings("TypeParameterUnusedInFormals")
@PublicApi
public class ExecutionContext {

    private final GraphQLSchema graphQLSchema;
    private final ExecutionId executionId;
    private final InstrumentationState instrumentationState;
    private final ExecutionStrategy queryStrategy;
    private final ExecutionStrategy mutationStrategy;
    private final ExecutionStrategy subscriptionStrategy;
    private final ImmutableMap fragmentsByName;
    private final OperationDefinition operationDefinition;
    private final Document document;
    private final ImmutableMapWithNullValues variables;
    private final Object root;
    private final Object context;
    private final Object localContext;
    private final Instrumentation instrumentation;
    private final List errors = Collections.synchronizedList(new ArrayList<>());
    private final Set errorPaths = new HashSet<>();
    private final DataLoaderRegistry dataLoaderRegistry;
    private final CacheControl cacheControl;
    private final Locale locale;
    private final ValueUnboxer valueUnboxer;
    private final ExecutionInput executionInput;
    private final Supplier queryTree;

    ExecutionContext(ExecutionContextBuilder builder) {
        this.graphQLSchema = builder.graphQLSchema;
        this.executionId = builder.executionId;
        this.instrumentationState = builder.instrumentationState;
        this.queryStrategy = builder.queryStrategy;
        this.mutationStrategy = builder.mutationStrategy;
        this.subscriptionStrategy = builder.subscriptionStrategy;
        this.fragmentsByName = builder.fragmentsByName;
        this.variables = ImmutableMapWithNullValues.copyOf(builder.variables);
        this.document = builder.document;
        this.operationDefinition = builder.operationDefinition;
        this.context = builder.context;
        this.root = builder.root;
        this.instrumentation = builder.instrumentation;
        this.dataLoaderRegistry = builder.dataLoaderRegistry;
        this.cacheControl = builder.cacheControl;
        this.locale = builder.locale;
        this.valueUnboxer = builder.valueUnboxer;
        this.errors.addAll(builder.errors);
        this.localContext = builder.localContext;
        this.executionInput = builder.executionInput;
        queryTree = FpKit.interThreadMemoize(() -> NormalizedQueryTreeFactory.createNormalizedQuery(graphQLSchema, operationDefinition, fragmentsByName, variables));
    }


    public ExecutionId getExecutionId() {
        return executionId;
    }

    public ExecutionInput getExecutionInput() {
        return executionInput;
    }

    public InstrumentationState getInstrumentationState() {
        return instrumentationState;
    }

    public Instrumentation getInstrumentation() {
        return instrumentation;
    }

    public GraphQLSchema getGraphQLSchema() {
        return graphQLSchema;
    }

    public Map getFragmentsByName() {
        return fragmentsByName;
    }

    public Document getDocument() {
        return document;
    }

    public OperationDefinition getOperationDefinition() {
        return operationDefinition;
    }

    public Map getVariables() {
        return variables;
    }

    @SuppressWarnings("unchecked")
    public  T getContext() {
        return (T) context;
    }

    @SuppressWarnings("unchecked")
    public  T getLocalContext() {
        return (T) localContext;
    }

    @SuppressWarnings("unchecked")
    public  T getRoot() {
        return (T) root;
    }

    public FragmentDefinition getFragment(String name) {
        return fragmentsByName.get(name);
    }

    public DataLoaderRegistry getDataLoaderRegistry() {
        return dataLoaderRegistry;
    }

    public CacheControl getCacheControl() {
        return cacheControl;
    }

    public Locale getLocale() {
        return locale;
    }

    public ValueUnboxer getValueUnboxer() {
        return valueUnboxer;
    }

    /**
     * This method will only put one error per field path.
     *
     * @param error     the error to add
     * @param fieldPath the field path to put it under
     */
    public void addError(GraphQLError error, ResultPath fieldPath) {
        //
        // see http://facebook.github.io/graphql/#sec-Errors-and-Non-Nullability about how per
        // field errors should be handled - ie only once per field if its already there for nullability
        // but unclear if its not that error path
        //
        if (!errorPaths.add(fieldPath)) {
            return;
        }
        this.errors.add(error);
    }

    /**
     * This method will allow you to add errors into the running execution context, without a check
     * for per field unique-ness
     *
     * @param error the error to add
     */
    public void addError(GraphQLError error) {
        // see https://github.com/graphql-java/graphql-java/issues/888 on how the spec is unclear
        // on how exactly multiple errors should be handled - ie only once per field or not outside the nullability
        // aspect.
        if (error.getPath() != null) {
            this.errorPaths.add(ResultPath.fromList(error.getPath()));
        }
        this.errors.add(error);
    }

    /**
     * @return the total list of errors for this execution context
     */
    public List getErrors() {
        return ImmutableList.copyOf(errors);
    }

    public ExecutionStrategy getQueryStrategy() {
        return queryStrategy;
    }

    public ExecutionStrategy getMutationStrategy() {
        return mutationStrategy;
    }

    public ExecutionStrategy getSubscriptionStrategy() {
        return subscriptionStrategy;
    }

    public Supplier getNormalizedQueryTree() {
        return queryTree;
    }

    /**
     * This helps you transform the current ExecutionContext object into another one by starting a builder with all
     * the current values and allows you to transform it how you want.
     *
     * @param builderConsumer the consumer code that will be given a builder to transform
     *
     * @return a new ExecutionContext object based on calling build on that builder
     */
    public ExecutionContext transform(Consumer builderConsumer) {
        ExecutionContextBuilder builder = ExecutionContextBuilder.newExecutionContextBuilder(this);
        builderConsumer.accept(builder);
        return builder.build();
    }
}