/*
 * 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.boot.jaxb.hbm.internal;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.hibernate.boot.jaxb.hbm.spi.JaxbHbmNativeQueryCollectionLoadReturnType;
import org.hibernate.boot.jaxb.hbm.spi.JaxbHbmNativeQueryJoinReturnType;
import org.hibernate.boot.jaxb.hbm.spi.JaxbHbmNativeQueryReturnType;
import org.hibernate.boot.jaxb.hbm.spi.JaxbHbmNativeQueryScalarReturnType;
import org.hibernate.boot.jaxb.hbm.spi.ResultSetMappingBindingDefinition;
import org.hibernate.internal.util.collections.CollectionHelper;

/**
 * Models the ResultSet mapping defined inline as part of a named native query definition
 *
 * @author Steve Ebersole
 */
public class ImplicitResultSetMappingDefinition implements ResultSetMappingBindingDefinition {
	private final String name;
	private final List valueMappingSources;

	public ImplicitResultSetMappingDefinition(
			String resultSetMappingName,
			List valueMappingSources) {
		this.name = resultSetMappingName;
		this.valueMappingSources = valueMappingSources;
	}

	@Override
	public String getName() {
		return name;
	}

	@Override
	public List getValueMappingSources() {
		return valueMappingSources;
	}

	public static class Builder {
		private final String queryName;

		private List valueMappingSources;

		public Builder(String queryName) {
			this.queryName = queryName;
		}

		public void addReturn(JaxbHbmNativeQueryScalarReturnType scalarReturn) {
			if ( valueMappingSources == null ) {
				valueMappingSources = new ArrayList();
			}
			valueMappingSources.add( scalarReturn );
		}

		public void addReturn(JaxbHbmNativeQueryReturnType rootReturn) {
			if ( valueMappingSources == null ) {
				valueMappingSources = new ArrayList();
			}
			valueMappingSources.add( rootReturn );
		}

		public void addReturn(JaxbHbmNativeQueryJoinReturnType joinReturn) {
			if ( valueMappingSources == null ) {
				valueMappingSources = new ArrayList();
			}
			valueMappingSources.add( joinReturn );
		}

		public void addReturn(JaxbHbmNativeQueryCollectionLoadReturnType collectionLoadReturn) {
			if ( valueMappingSources == null ) {
				valueMappingSources = new ArrayList<JaxbHbmNativeQueryCollectionLoadReturnType>();
			}
			valueMappingSources.add( collectionLoadReturn );
		}

		public boolean hasAnyReturns() {
			return CollectionHelper.isNotEmpty( valueMappingSources );
		}

		public ImplicitResultSetMappingDefinition build() {
			return new ImplicitResultSetMappingDefinition(
					queryName + "-inline-result-set-mapping-def",
					copy( valueMappingSources )
			);
		}

		private <T> List<T> copy(List<T> returnBindings) {
			if ( returnBindings == null ) {
				return Collections.emptyList();
			}

			return Collections.unmodifiableList( returnBindings );
		}
	}
}