/*******************************************************************************
 * Copyright (c) 2007, 2012 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.core.context;

import org.eclipse.jpt.common.utility.internal.iterables.ArrayIterable;
import org.eclipse.jpt.common.utility.internal.iterables.ListIterable;

/**
 * Named and named native queries.
 * <p>
 * Queries can be defined on<ul>
 * <li>Java and <code>orm.xml</code> entities
 * <li>Java (<em>only</em>) mapped superclasses
 * <li><code>orm.xml</code> entity mappings elements
 * </ul>
 * <p>
 * Provisional API: This interface is part of an interim API that is still
 * under development and expected to change significantly before reaching
 * stability. It is available at this early stage to solicit feedback from
 * pioneering adopters on the understanding that any code that uses this API
 * will almost certainly be broken (repeatedly) as the API evolves.
 * 
 * @version 2.2
 * @since 2.0
 */
public interface Query
	extends JpaNamedContextNode
{

	/**
	 * Return the generator's type.
	 */
	Class<? extends Query> getType();
		@SuppressWarnings("unchecked")
		Iterable<Class<? extends Query>> TYPES = new ArrayIterable<Class<? extends Query>>(
			NamedQuery.class,
			NamedNativeQuery.class
		);

	// ********** query **********

	String QUERY_PROPERTY = "query"; //$NON-NLS-1$

	String getQuery();

	void setQuery(String query);


	// ********** hints **********

	String HINTS_LIST = "hints"; //$NON-NLS-1$

	/**
	 * Return the query's hints.
	 */
	ListIterable<? extends QueryHint> getHints();

	/**
	 * Return the number of hints.
	 */
	int getHintsSize();

	/**
	 * Add a hint to the query and return the object representing it.
	 */
	QueryHint addHint();

	/**
	 * Add a hint to the query and return the object representing it.
	 */
	QueryHint addHint(int index);

	/**
	 * Remove the hint at the index from the query.
	 */
	void removeHint(QueryHint queryHint);

	/**
	 * Remove the hint from the query.
	 */
	void removeHint(int index);

	/**
	 * Move the hint from the source index to the target index.
	 */
	void moveHint(int targetIndex, int sourceIndex);
	
	QueryHint getHint(int i);
}