| /* |
| * 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.pig.data.Tuple; |
| |
| |
| public abstract class FilterFunc { |
| |
| /** |
| * This callback method must be implemented by all subclasses. This |
| * is the method that will be invoked on every Tuple of a given dataset. |
| * Since the dataset may be divided up in a variety of ways the programmer |
| * should not make assumptions about state that is maintained between |
| * invocations of this method. |
| * |
| * @param input the Tuple to be processed. |
| * @throws IOException |
| */ |
| abstract public boolean exec(Tuple input) throws IOException; |
| |
| /** |
| * Placeholder for cleanup to be performed at the end. User defined functions can override. |
| * |
| */ |
| public void finish(){} |
| } |
| |