001    /*
002     * Copyright (c) 2007-2014 Concurrent, 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    
021    package cascading.operation;
022    
023    import cascading.tuple.Fields;
024    
025    public interface OperationCall<Context>
026      {
027      /**
028       * Returns the user set context object, C.
029       *
030       * @return user defined object
031       */
032      Context getContext();
033    
034      /**
035       * Sets the user defined 'context' object.
036       *
037       * @param context user defined object
038       */
039      void setContext( Context context );
040    
041      /**
042       * Returns the {@link Fields} of the expected arguments {@link cascading.tuple.TupleEntry}.
043       *
044       * @return the argumentFields (type Fields) of this OperationCall object.
045       */
046      Fields getArgumentFields();
047      }