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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 http://www.gnu.org/licenses/lgpl-2.1.html
 */

package org.hibernate.query.internal;

import java.util.Objects;

import org.hibernate.metamodel.model.domain.spi.AllowableParameterType;
import org.hibernate.query.named.spi.ParameterMemento;
import org.hibernate.query.sqm.tree.expression.SqmParameter;

/**
 * QueryParameter impl for positional-parameters in HQL, JPQL or Criteria queries.
 *
 * @author Steve Ebersole
 */
public class QueryParameterPositionalImpl extends AbstractQueryParameter {

	private final int position;

	/**
	 * Create a positional parameter descriptor from the SQM parameter
	 *
	 * @param parameter The source parameter info
	 *
	 * @return The parameter descriptor
	 */
	public static  QueryParameterPositionalImpl fromSqm(SqmParameter parameter) {
		assert parameter.getPosition() != null;
		assert parameter.getName() == null;

		return new QueryParameterPositionalImpl(
				parameter.getPosition(),
				parameter.allowMultiValuedBinding(),
				parameter.getAnticipatedType() != null
						? (AllowableParameterType) parameter.getAnticipatedType()
						: null
		);
	}

	public static  QueryParameterPositionalImpl fromNativeQuery(int position) {
		return new QueryParameterPositionalImpl(
				position,
				false,
				null
		);
	}

	public QueryParameterPositionalImpl(
			Integer position,
			boolean allowMultiValuedBinding,
			AllowableParameterType anticipatedType) {
		super( allowMultiValuedBinding, anticipatedType );
		this.position = position;
	}

	@Override
	public Integer getPosition() {
		return position;
	}

	@Override
	public ParameterMemento toMemento() {
		return session -> new QueryParameterPositionalImpl( getPosition(), allowsMultiValuedBinding(), getHibernateType() );
	}

	@Override
	public boolean equals(Object o) {
		if ( this == o ) {
			return true;
		}
		if ( o == null || getClass() != o.getClass() ) {
			return false;
		}
		QueryParameterPositionalImpl that = (QueryParameterPositionalImpl) o;
		return position == that.position;
	}

	@Override
	public int hashCode() {
		return Objects.hash( position );
	}
}