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GraphqL Java
There is a newer version: 230521-nf-execution
package graphql.execution;

import graphql.Assert;
import graphql.PublicApi;
import graphql.language.Field;

import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

import static graphql.Assert.assertNotNull;

/**
 * The parameters that are passed to execution strategies
 */
@PublicApi
public class ExecutionStrategyParameters {
    private final ExecutionTypeInfo typeInfo;
    private final Object source;
    private final Map arguments;
    private final Map> fields;
    private final NonNullableFieldValidator nonNullableFieldValidator;
    private final ExecutionPath path;
    private final List currentField;

    private ExecutionStrategyParameters(ExecutionTypeInfo typeInfo, Object source, Map> fields, Map arguments, NonNullableFieldValidator nonNullableFieldValidator, ExecutionPath path, List currentField) {
        this.typeInfo = assertNotNull(typeInfo, "typeInfo is null");
        this.fields = assertNotNull(fields, "fields is null");
        this.source = source;
        this.arguments = arguments;
        this.nonNullableFieldValidator = nonNullableFieldValidator;
        this.path = path;
        this.currentField = currentField;
    }

    public ExecutionTypeInfo typeInfo() {
        return typeInfo;
    }

    public Object source() {
        return source;
    }

    public Map> fields() {
        return fields;
    }

    public Map arguments() {
        return arguments;
    }

    public NonNullableFieldValidator nonNullFieldValidator() {
        return nonNullableFieldValidator;
    }

    public ExecutionPath path() {
        return path;
    }

    /**
     * This returns the current field in its query representations.  Global fragments mean that
     * a single named field can have multiple representations and different field subselections
     * hence the use of a list of Field
     *
     * @return the current field in list form  or null if this has not be computed yet
     */
    public List field() {
        return currentField;
    }

    public ExecutionStrategyParameters transform(Consumer builderConsumer) {
        Builder builder = newParameters(this);
        builderConsumer.accept(builder);
        return builder.build();
    }

    @Override
    public String toString() {
        return String.format("ExecutionStrategyParameters { path=%s, typeInfo=%s, source=%s, fields=%s }",
                path, typeInfo, source, fields);
    }

    public static Builder newParameters() {
        return new Builder();
    }

    public static Builder newParameters(ExecutionStrategyParameters oldParameters) {
        return new Builder(oldParameters);
    }

    public static class Builder {
        ExecutionTypeInfo typeInfo;
        Object source;
        Map> fields;
        Map arguments;
        NonNullableFieldValidator nonNullableFieldValidator;
        ExecutionPath path = ExecutionPath.rootPath();
        List currentField;

        /**
         * @see ExecutionStrategyParameters#newParameters()
         */
        private Builder() {
        }

        /**
         * @see ExecutionStrategyParameters#newParameters(ExecutionStrategyParameters)
         */
        private Builder(ExecutionStrategyParameters oldParameters) {
            this.typeInfo = oldParameters.typeInfo;
            this.source = oldParameters.source;
            this.fields = oldParameters.fields;
            this.arguments = oldParameters.arguments;
            this.nonNullableFieldValidator = oldParameters.nonNullableFieldValidator;
        }

        public Builder typeInfo(ExecutionTypeInfo type) {
            this.typeInfo = type;
            return this;
        }

        public Builder typeInfo(ExecutionTypeInfo.Builder type) {
            this.typeInfo = type.build();
            return this;
        }

        public Builder fields(Map> fields) {
            this.fields = fields;
            return this;
        }

        public Builder field(List currentField) {
            this.currentField = currentField;
            return this;
        }

        public Builder source(Object source) {
            this.source = source;
            return this;
        }

        public Builder arguments(Map arguments) {
            this.arguments = arguments;
            return this;
        }

        public Builder nonNullFieldValidator(NonNullableFieldValidator nonNullableFieldValidator) {
            this.nonNullableFieldValidator = Assert.assertNotNull(nonNullableFieldValidator, "requires a NonNullValidator");
            return this;
        }

        public Builder path(ExecutionPath path) {
            this.path = path;
            return this;
        }

        public ExecutionStrategyParameters build() {
            return new ExecutionStrategyParameters(typeInfo, source, fields, arguments, nonNullableFieldValidator, path, currentField);
        }
    }
}