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/************************************************************************
 * © 2019-2023 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cds.ql.cqn;

import java.util.stream.Stream;

public interface CqnElementRef extends CqnReference, CqnValue, CqnSelectListValue {

	String $KEY = "$key";

	@Override
	default boolean isRef() {
		return true;
	}

	@Override
	default CqnElementRef asRef() {
		return this;
	}

	@Override
	default Stream ofRef() {
		return Stream.of(this);
	}

	@Override
	default boolean isValue() {
		return true;
	}

	@Override
	default CqnValue value() {
		return this;
	}

	/**
	 * Dispatches the handling of this {@code CqnElementRef} to a given visitor.
	 * 
	 * Neither the segments of this reference nor the segments' filters are
	 * traversed.
	 * 
	 * @param visitor the {@link CqnVisitor}
	 */
	@Override
	default void accept(CqnVisitor visitor) {
		visitor.visit(this);
	}

	@Override
	default CqnSelectListValue asValue() {
		return this;
	}

}