001/* 002 * Copyright (c) 2016-2017 Chris K Wensel. 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.nested.core; 022 023import cascading.operation.FunctionCall; 024import cascading.operation.OperationCall; 025import cascading.tuple.Fields; 026import cascading.tuple.TupleEntry; 027 028/** 029 * 030 */ 031public abstract class NestedSpecBaseOperation<Node, Result, Context> extends NestedBaseOperation<Node, Result, Context> 032 { 033 public NestedSpecBaseOperation( NestedCoercibleType<Node, Result> nestedCoercibleType, Fields fieldDeclaration ) 034 { 035 super( nestedCoercibleType, fieldDeclaration ); 036 } 037 038 public NestedSpecBaseOperation( NestedCoercibleType<Node, Result> nestedCoercibleType, int numArgs, Fields fieldDeclaration ) 039 { 040 super( nestedCoercibleType, numArgs, fieldDeclaration ); 041 } 042 043 protected abstract boolean isInto(); 044 045 protected Node getResultNode( OperationCall<?> operationCall ) 046 { 047 if( isInto() ) 048 return getArgument( operationCall ); 049 else 050 return getRootNode(); 051 } 052 053 protected Node getArgument( OperationCall<?> operationCall ) 054 { 055 TupleEntry arguments = ( (FunctionCall<Object>) operationCall ).getArguments(); 056 057 Node object = (Node) arguments.getObject( arguments.size() - 1, getCoercibleType() ); 058 059 return deepCopy( object ); 060 } 061 }