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


import graphql.Internal;
import graphql.PublicApi;
import graphql.util.TraversalControl;
import graphql.util.TraverserContext;

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

import static graphql.Assert.assertNotNull;
import static graphql.language.NodeChildrenContainer.newNodeChildrenContainer;
import static java.util.Collections.emptyMap;

@PublicApi
public class ObjectValue extends AbstractNode implements Value {

    private final List objectFields = new ArrayList<>();

    public static final String CHILD_OBJECT_FIELDS = "objectFields";

    @Internal
    protected ObjectValue(List objectFields, SourceLocation sourceLocation, List comments, IgnoredChars ignoredChars, Map additionalData) {
        super(sourceLocation, comments, ignoredChars, additionalData);
        this.objectFields.addAll(objectFields);
    }

    /**
     * alternative to using a Builder for convenience
     *
     * @param objectFields the list of field that make up this object value
     */
    public ObjectValue(List objectFields) {
        this(objectFields, null, new ArrayList<>(), IgnoredChars.EMPTY, emptyMap());
    }

    public List getObjectFields() {
        return new ArrayList<>(objectFields);
    }

    @Override
    public List getChildren() {
        List result = new ArrayList<>();
        result.addAll(objectFields);
        return result;
    }

    @Override
    public NodeChildrenContainer getNamedChildren() {
        return newNodeChildrenContainer()
                .children(CHILD_OBJECT_FIELDS, objectFields)
                .build();
    }

    @Override
    public ObjectValue withNewChildren(NodeChildrenContainer newChildren) {
        return transform(builder -> builder
                .objectFields(newChildren.getChildren(CHILD_OBJECT_FIELDS))
        );
    }

    @Override
    public boolean isEqualTo(Node o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        return true;

    }

    @Override
    public ObjectValue deepCopy() {
        return new ObjectValue(deepCopy(objectFields), getSourceLocation(), getComments(), getIgnoredChars(), getAdditionalData());
    }


    @Override
    public String toString() {
        return "ObjectValue{" +
                "objectFields=" + objectFields +
                '}';
    }

    @Override
    public TraversalControl accept(TraverserContext context, NodeVisitor visitor) {
        return visitor.visitObjectValue(this, context);
    }


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

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

    public static final class Builder implements NodeBuilder {
        private SourceLocation sourceLocation;
        private List objectFields = new ArrayList<>();
        private List comments = new ArrayList<>();
        private IgnoredChars ignoredChars = IgnoredChars.EMPTY;
        private Map additionalData = new LinkedHashMap<>();

        private Builder() {
        }

        private Builder(ObjectValue existing) {
            this.sourceLocation = existing.getSourceLocation();
            this.comments = existing.getComments();
            this.objectFields = existing.getObjectFields();
            this.additionalData  =existing.getAdditionalData();
        }

        public Builder sourceLocation(SourceLocation sourceLocation) {
            this.sourceLocation = sourceLocation;
            return this;
        }

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

        public Builder objectField(ObjectField objectField) {
            this.objectFields.add(objectField);
            return this;
        }

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

        public Builder ignoredChars(IgnoredChars ignoredChars) {
            this.ignoredChars = ignoredChars;
            return this;
        }

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

        public Builder additionalData(String key, String value) {
            this.additionalData.put(key, value);
            return this;
        }

        public ObjectValue build() {
            return new ObjectValue(objectFields, sourceLocation, comments, ignoredChars, additionalData);
        }
    }
}