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There is a newer version: 230521-nf-execution

package graphql.execution;

import graphql.language.Directive;

import java.util.List;
import java.util.Map;

import static graphql.Directives.IncludeDirective;
import static graphql.Directives.SkipDirective;
import static graphql.language.NodeUtil.directivesByName;


public class ConditionalNodes {

    private final ValuesResolver valuesResolver;

    public ConditionalNodes() {
        valuesResolver = new ValuesResolver();
    }

    public boolean shouldInclude(Map variables, List directives) {
        boolean skip = getDirectiveResult(variables, directives, SkipDirective.getName(), false);
        boolean include = getDirectiveResult(variables, directives, IncludeDirective.getName(), true);
        return !skip && include;
    }

    private Directive getDirectiveByName(List directives, String name) {
        if (directives.isEmpty()) {
            return null;
        }
        return directivesByName(directives).get(name);
    }

    private boolean getDirectiveResult(Map variables, List directives, String directiveName, boolean defaultValue) {
        Directive directive = getDirectiveByName(directives, directiveName);
        if (directive != null) {
            Map argumentValues = valuesResolver.getArgumentValues(SkipDirective.getArguments(), directive.getArguments(), variables);
            return (Boolean) argumentValues.get("if");
        }

        return defaultValue;
    }

}