/*
* 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.cassandra.cql.hooks;
import org.apache.cassandra.cql.CQLStatement;
import org.apache.cassandra.exceptions.RequestExecutionException;
import org.apache.cassandra.exceptions.RequestValidationException;
/**
* Run before the CQL Statement is executed in
* {@link org.apache.cassandra.cql.QueryProcessor}. The CQLStatement
* returned from the processStatement method is what is actually executed
* by the QueryProcessor.
*/
public interface PreExecutionHook
{
/**
* Perform pre-processing on a CQL statement prior to it being
* executed by the QueryProcessor. If required, implementations
* may modify the statement as the returned instance is what
* is actually executed.
*
* @param statement the statement to perform pre-processing on
* @param context execution context containing additional info
* about the operation and statement
* @return the actual statement that will be executed, possibly
* a modification of the initial statement
* @throws RequestExecutionException, RequestValidationException
*/
CQLStatement processStatement(CQLStatement statement, ExecutionContext context) throws RequestExecutionException, RequestValidationException;
}