/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.engine.query.sql;

import java.util.Map;

import org.hibernate.LockMode;

/**
 * Represents a return defined as part of a native sql query which
 * names a collection role in the form {classname}.{collectionrole}; it
 * is used in defining a custom sql query for loading an entity's
 * collection in non-fetching scenarios (i.e., loading the collection
 * itself as the "root" of the result).
 *
 * @author Steve Ebersole
 */
public class NativeSQLQueryCollectionReturn extends NativeSQLQueryNonScalarReturn {
	private final String ownerEntityName;
	private final String ownerProperty;
	private final int hashCode;

	/**
	 * Construct a native-sql return representing a collection initializer
	 *
	 * @param alias The result alias
	 * @param ownerEntityName The entity-name of the entity owning the collection
	 * to be initialized.
	 * @param ownerProperty The property name (on the owner) which represents
	 * the collection to be initialized.
	 * @param propertyResults Any user-supplied column->property mappings
	 * @param lockMode The lock mode to apply to the collection.
	 */
	public NativeSQLQueryCollectionReturn(
			String alias,
			String ownerEntityName,
			String ownerProperty,
			Map propertyResults,
			LockMode lockMode) {
		super( alias, propertyResults, lockMode );
		this.ownerEntityName = ownerEntityName;
		this.ownerProperty = ownerProperty;
		this.hashCode = determineHashCode();
	}

	/**
	 * Returns the class owning the collection.
	 *
	 * @return The class owning the collection.
	 */
	public String getOwnerEntityName() {
		return ownerEntityName;
	}

	/**
	 * Returns the name of the property representing the collection from the {@link #getOwnerEntityName}.
	 *
	 * @return The name of the property representing the collection on the owner class.
	 */
	public String getOwnerProperty() {
		return ownerProperty;
	}

	public boolean equals(Object o) {
		if ( this == o ) {
			return true;
		}
		if ( o == null || getClass() != o.getClass() ) {
			return false;
		}
		if ( !super.equals( o ) ) {
			return false;
		}

		NativeSQLQueryCollectionReturn that = ( NativeSQLQueryCollectionReturn ) o;

		if ( ownerEntityName != null ? !ownerEntityName.equals( that.ownerEntityName ) : that.ownerEntityName != null ) {
			return false;
		}
		if ( ownerProperty != null ? !ownerProperty.equals( that.ownerProperty ) : that.ownerProperty != null ) {
			return false;
		}

		return true;
	}

	public int hashCode() {
		return hashCode;
	}
	
	private int determineHashCode() {
		int result = super.hashCode();
		result = 31 * result + ( ownerEntityName != null ? ownerEntityName.hashCode() : 0 );
		result = 31 * result + ( ownerProperty != null ? ownerProperty.hashCode() : 0 );
		return result;
	}
}
