/*

   Derby - Class org.apache.derby.iapi.sql.execute.ExecutionStmtValidator

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.derby.iapi.sql.execute;

import org.apache.derby.shared.common.error.StandardException;
import org.apache.derby.iapi.sql.execute.ConstantAction;

/**
 * An ExecutionStatementValidator is an object that is
 * handed a ConstantAction and asked whether it is ok for
 * this result set to execute.  When something like
 * a trigger is executing, one of these gets pushed.
 * Before execution, each validator that has been pushed
 * is invoked on the result set that we are about to
 * execution.  It is up to the validator to look at
 * the result set and either complain (throw an exception)
 * or let it through.
 *
 */
public interface ExecutionStmtValidator
{
	/**
	 * Validate the statement.
	 *
	 * @param constantAction The constant action that we are about to execute.  
	 *
	 * @exception StandardException on error
	 *
	 * @see ConstantAction
	 */
	public void validateStatement(ConstantAction constantAction)
		throws StandardException;
}
