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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
 */
package org.hibernate.query.sqm.tree.expression;

import org.hibernate.query.sqm.NodeBuilder;
import org.hibernate.query.sqm.SqmExpressable;
import org.hibernate.query.sqm.SemanticQueryWalker;

/**
 * @author Steve Ebersole
 */
public class SqmLiteralNull extends SqmLiteral {

	private static final SqmExpressable NULL_TYPE = () -> null;

	public SqmLiteralNull(NodeBuilder nodeBuilder) {
		//noinspection unchecked
		this( (SqmExpressable) NULL_TYPE, nodeBuilder );
	}

	public SqmLiteralNull(SqmExpressable expressableType, NodeBuilder nodeBuilder) {
		super( expressableType, nodeBuilder );
	}

	@Override
	public  X accept(SemanticQueryWalker walker) {
		return walker.visitLiteral( this );
	}

	@Override
	public String asLoggableText() {
		return "";
	}

	@Override
	public void appendHqlString(StringBuilder sb) {
		sb.append( "null" );
	}
}
 















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