| /* |
| * 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.pig; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore; |
| |
| /** |
| * A {@link StoreFunc} should implement this interface to enable overwriting its |
| * store/output location if it already exists. |
| */ |
| public interface OverwritableStoreFunc { |
| /** |
| * This method is called by the Pig runtime to determine whether to ignore output validation problems |
| * (see {@link PigOutputFormat#checkOutputSpecs} and {@link InputOutputFileValidator#validate}) and to delete the existing output. |
| * @return whether to overwrite the store/output location of this {@link StoreFunc}. |
| */ |
| public boolean shouldOverwrite(); |
| |
| /** |
| * This method is called to cleanup the store/output location of this {@link StoreFunc}. |
| * |
| * @param store The {@link POStore} object to get info about the store |
| * operator for this store function. |
| * @param job The {@link Job} object to get job related information. |
| * @throws IOException if an exception occurs during the cleanup. |
| */ |
| public void cleanupOutput(POStore store, Job job) throws IOException; |
| } |