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Hibernate's core ORM functionality

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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 .
 */
package org.hibernate.query.criteria.internal.expression;

import java.io.Serializable;
import javax.persistence.criteria.Expression;

import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.Renderable;
import org.hibernate.query.criteria.internal.compile.RenderingContext;

/**
 * Models unary arithmetic operation (unary plus and unary minus).
 *
 * @author Steve Ebersole
 */
public class UnaryArithmeticOperation 
		extends ExpressionImpl
		implements UnaryOperatorExpression, Serializable {

	public static enum Operation {
		UNARY_PLUS, UNARY_MINUS
	}

	private final Operation operation;
	private final Expression operand;

	@SuppressWarnings({ "unchecked" })
	public UnaryArithmeticOperation(
			CriteriaBuilderImpl criteriaBuilder,
			Operation operation,
			Expression operand) {
		super( criteriaBuilder, (Class)operand.getJavaType() );
		this.operation = operation;
		this.operand = operand;
	}

	public Operation getOperation() {
		return operation;
	}

	@Override
	public Expression getOperand() {
		return operand;
	}

	@Override
	public void registerParameters(ParameterRegistry registry) {
		Helper.possibleParameter( getOperand(), registry );
	}

	@Override
	public String render(RenderingContext renderingContext) {
		return ( getOperation() == Operation.UNARY_MINUS ? '-' : '+' )
				+ ( (Renderable) getOperand() ).render( renderingContext );
	}
}