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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.sqm.tree;

import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.Supplier;

import org.hibernate.query.sqm.NodeBuilder;
import org.hibernate.query.sqm.SqmQuerySource;
import org.hibernate.query.sqm.tree.expression.JpaCriteriaParameter;
import org.hibernate.query.sqm.tree.expression.SqmJpaCriteriaParameterWrapper;
import org.hibernate.query.sqm.tree.expression.SqmParameter;
import org.hibernate.query.sqm.internal.ParameterCollector;

/**
 * @author Steve Ebersole
 */
public abstract class AbstractSqmStatement extends AbstractSqmNode implements SqmStatement, ParameterCollector {
	private final SqmQuerySource querySource;

	public AbstractSqmStatement(
			SqmQuerySource querySource,
			NodeBuilder builder) {
		super( builder );
		this.querySource = querySource;
	}

	private Set> parameters;

	@Override
	public SqmQuerySource getQuerySource() {
		return querySource;
	}

	@Override
	public void addParameter(SqmParameter parameter) {
		if ( parameters == null ) {
			parameters = new HashSet<>();
		}

		parameters.add( parameter );
	}

	@Override
	public Set> getSqmParameters() {
		return parameters == null ? Collections.emptySet() : Collections.unmodifiableSet( parameters );
	}

	@Override
	public ParameterResolutions resolveParameters() {
		return new ParameterResolutions() {
			@Override
			public Set> getSqmParameters() {
				return AbstractSqmStatement.this.getSqmParameters();
			}

			@Override
			public Map, Supplier>> getJpaCriteriaParamResolutions() {
				return Collections.emptyMap();
			}
		};
	}
}