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/*******************************************************************************
 * Copyright (c) 2012, 2013 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 *
 ******************************************************************************/
package org.eclipse.persistence.jpa.jpql;

/**
 * This extension provides additional support to semantic validation by adding support for non-JPA
 * specific artifacts, such as database objects.
 *
 * @version 2.5
 * @since 2.5
 * @author Pascal Filion
 */
public interface EclipseLinkSemanticValidatorExtension {

	/**
	 * A null-instance of this extension.
	 */
	EclipseLinkSemanticValidatorExtension NULL_EXTENSION = new EclipseLinkSemanticValidatorExtension() {
		public boolean columnExists(String tableName, String columnName) {
			return false;
		}
		public String getEntityTable(String entityName) {
			return null;
		}
		public boolean tableExists(String tableName) {
			return false;
		}
	};

	/**
	 * Determines whether the column with the given name exists or not in the table with the given name.
	 *
	 * @param tableName The name of the table to look for the column
	 * @param columnName The name of the column to determine its existence
	 * @return true if the column exists; false otherwise
	 */
	boolean columnExists(String tableName, String columnName);

	/**
	 * Returns the name of the primary table defined for the entity with the given name.
	 *
	 * @param entityName The name of the entity
	 * @return The name of the entity's primary table
	 */
	String getEntityTable(String entityName);

	/**
	 * Determines whether the table with the given exists or not.
	 *
	 * @param tableName The name of the table to determine its existence
	 * @return true if the table exists; false otherwise
	 */
	boolean tableExists(String tableName);
}