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


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

import java.util.ArrayList;
import java.util.List;

/*
 * This is provided to a DataFetcher, therefore it is a public API.
 * This might change in the future.
 */
@PublicApi
public class Field extends AbstractNode implements Selection, SelectionSetContainer, DirectivesContainer {

    private String name;
    private String alias;
    private List arguments;
    private List directives;
    private SelectionSet selectionSet;

    public Field() {
        this(null, null, new ArrayList<>(), new ArrayList<>(), null);
    }

    public Field(String name) {
        this(name, null, new ArrayList<>(), new ArrayList<>(), null);
    }

    public Field(String name, SelectionSet selectionSet) {
        this(name, null, new ArrayList<>(), new ArrayList<>(), selectionSet);
    }


    public Field(String name, List arguments) {
        this(name, null, arguments, new ArrayList<>(), null);
    }

    public Field(String name, List arguments, List directives) {
        this(name, null, arguments, directives, null);
    }

    public Field(String name, List arguments, SelectionSet selectionSet) {
        this(name, null, arguments, new ArrayList<>(), selectionSet);
    }

    public Field(String name, String alias, List arguments, List directives, SelectionSet selectionSet) {
        this.name = name;
        this.alias = alias;
        this.arguments = arguments;
        this.directives = directives;
        this.selectionSet = selectionSet;
    }

    @Override
    public List getChildren() {
        List result = new ArrayList<>();
        result.addAll(arguments);
        result.addAll(directives);
        if (selectionSet != null) result.add(selectionSet);
        return result;
    }


    @Override
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAlias() {
        return alias;
    }

    public void setAlias(String alias) {
        this.alias = alias;
    }

    public List getArguments() {
        return arguments;
    }

    public void setArguments(List arguments) {
        this.arguments = arguments;
    }

    @Override
    public List getDirectives() {
        return directives;
    }

    public void setDirectives(List directives) {
        this.directives = directives;
    }

    @Override
    public SelectionSet getSelectionSet() {
        return selectionSet;
    }

    public void setSelectionSet(SelectionSet selectionSet) {
        this.selectionSet = selectionSet;
    }

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

        Field that = (Field) o;

        return NodeUtil.isEqualTo(this.name, that.name) && NodeUtil.isEqualTo(this.alias, that.alias);
    }

    @Override
    public Field deepCopy() {
        return new Field(name,
                alias,
                deepCopy(arguments),
                deepCopy(directives),
                deepCopy(selectionSet)
        );
    }

    @Override
    public String toString() {
        return "Field{" +
                "name='" + name + '\'' +
                ", alias='" + alias + '\'' +
                ", arguments=" + arguments +
                ", directives=" + directives +
                ", selectionSet=" + selectionSet +
                '}';
    }

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