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/************************************************************************
 * © 2020-2023 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cds.ql.cqn;

import java.util.Optional;
import java.util.stream.Stream;

public interface CqnSelectListValue extends CqnSelectListItem {

	CqnValue value();

	/**
	 * Returns display name of this select list value. It is the name of the element
	 * of the underlying entity or the alias.
	 *
	 * @return the display name as a string
	 */
	String displayName();

	Optional alias();

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

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

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

	@Override
	default boolean isRef() {
		return value().isRef();
	}

	@Override
	default CqnElementRef asRef() {
		return value().asRef();
	}

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

	@Override
	default void accept(CqnVisitor visitor) {
		value().accept(visitor);

		visitor.visit(this);
	}

}