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

import java.util.Locale;
import java.util.Optional;

public interface CqnJoin extends CqnSource, CqnToken {

	CqnSource left();

	CqnSource right();

	Optional on();

	Type type();

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

	@Override
	default CqnJoin asJoin() {
		return this;
	}

	enum Type {
		INNER, LEFT, RIGHT, FULL, CROSS;

		public static Type joinType(String type) {
			return Type.valueOf(type.toUpperCase(Locale.US));
		}

		@Override
		public String toString() {
			return name().toLowerCase(Locale.US);
		}
	}
}