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package graphql.util;

import graphql.Internal;

@Internal
public interface TraverserVisitor {

    /**
     * @param context the context in place
     *
     * @return Any allowed control value
     */
    TraversalControl enter(TraverserContext context);

    /**
     * @param context the context in place
     *
     * @return Only Continue or Quit allowed
     */
    TraversalControl leave(TraverserContext context);

    /**
     * @param context the context in place
     *
     * @return Only Continue or Quit allowed
     */
    default TraversalControl backRef(TraverserContext context) {
        return TraversalControl.CONTINUE;
    }

}