queryablecollection.java

hibernate-distribution-3.3.1.GA-dist.zip源码

/*
 * 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.persister.collection;

import org.hibernate.FetchMode;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.persister.entity.Joinable;
import org.hibernate.persister.entity.PropertyMapping;

/**
 * A collection role that may be queried or loaded by outer join.
 * @author Gavin King
 */
public interface QueryableCollection extends PropertyMapping, Joinable, CollectionPersister {
	/**
	 * Generate a list of collection index and element columns
	 */
	public abstract String selectFragment(String alias, String columnSuffix);
	/**
	 * Get the names of the collection index columns if
	 * this is an indexed collection (optional operation)
	 */
	public abstract String[] getIndexColumnNames();
	/**
	 * Get the index formulas if this is an indexed collection 
	 * (optional operation)
	 */
	public abstract String[] getIndexFormulas();
	/**
	 * Get the names of the collection index columns if
	 * this is an indexed collection (optional operation),
	 * aliased by the given table alias
	 */
	public abstract String[] getIndexColumnNames(String alias);
	/**
	 * Get the names of the collection element columns (or the primary
	 * key columns in the case of a one-to-many association),
	 * aliased by the given table alias
	 */
	public abstract String[] getElementColumnNames(String alias);
	/**
	 * Get the names of the collection element columns (or the primary
	 * key columns in the case of a one-to-many association)
	 */
	public abstract String[] getElementColumnNames();
	/**
	 * Get the order by SQL
	 */
	public abstract String getSQLOrderByString(String alias);

	/**
	 * Get the order-by to be applied at the target table of a many to many
	 *
	 * @param alias The alias for the many-to-many target table
	 * @return appropriate order-by fragment or empty string.
	 */
	public abstract String getManyToManyOrderByString(String alias);

	/**
	 * Does this collection role have a where clause filter?
	 */
	public abstract boolean hasWhere();
	/**
	 * Get the persister of the element class, if this is a
	 * collection of entities (optional operation).  Note that
	 * for a one-to-many association, the returned persister
	 * must be <tt>OuterJoinLoadable</tt>.
	 */
	public abstract EntityPersister getElementPersister();
	/**
	 * Should we load this collection role by outerjoining?
	 */
	public abstract FetchMode getFetchMode();

}