001/* 002 * Copyright (c) 2016-2017 Chris K Wensel <chris@wensel.net>. All Rights Reserved. 003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved. 004 * 005 * Project and contact information: http://www.cascading.org/ 006 * 007 * This file is part of the Cascading project. 008 * 009 * Licensed under the Apache License, Version 2.0 (the "License"); 010 * you may not use this file except in compliance with the License. 011 * You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, software 016 * distributed under the License is distributed on an "AS IS" BASIS, 017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 018 * See the License for the specific language governing permissions and 019 * limitations under the License. 020 */ 021 022package cascading.operation; 023 024import cascading.tuple.Fields; 025 026public interface OperationCall<Context> 027 { 028 /** 029 * Returns the user set context object, C. 030 * 031 * @return user defined object 032 */ 033 Context getContext(); 034 035 /** 036 * Sets the user defined 'context' object. 037 * 038 * @param context user defined object 039 */ 040 void setContext( Context context ); 041 042 /** 043 * Returns the {@link Fields} of the expected arguments {@link cascading.tuple.TupleEntry}. 044 * 045 * @return the argumentFields (type Fields) of this OperationCall object. 046 */ 047 Fields getArgumentFields(); 048 049 /** 050 * Returns the {@link Fields} declared by this operation. 051 * <p> 052 * If the original declared fields on the current operation defined a substitution, this value 053 * will be the actual resolved fields. That is, if the current operation declared {@link Fields#ARGS} 054 * this method will return the declared arguments on the operator pipe. 055 * 056 * @return the declaredFields (type Fields) of this OperationCall object. 057 */ 058 Fields getDeclaredFields(); 059 }