001/* 002 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.operation; 022 023import cascading.flow.FlowProcess; 024 025/** 026 * Interface Function marks a given {@link Operation} as a function, as opposed to being a {@link Filter}. 027 * <p/> 028 * A Function is responsible for taking Tuple arguments and returning one or more result Tuples. 029 * <p/> 030 * To implement a Function, (optionally) sub-class {@link BaseOperation} and have the new sub-class {@code implement} 031 * this interface. 032 */ 033public interface Function<Context> extends Operation<Context> 034 { 035 /** 036 * Method operate provides the implementation of this Function. 037 * 038 * @param flowProcess of type FlowProcess 039 * @param functionCall of type FunctionCall 040 */ 041 void operate( FlowProcess flowProcess, FunctionCall<Context> functionCall ); 042 }