001/* 002 * Copyright (c) 2016 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.flow.stream.element; 023 024import cascading.CascadingException; 025import cascading.flow.FlowProcess; 026import cascading.flow.stream.duct.Duct; 027import cascading.operation.Filter; 028import cascading.pipe.Each; 029import cascading.pipe.OperatorException; 030import cascading.tuple.Fields; 031import cascading.tuple.TupleEntry; 032 033/** 034 * 035 */ 036public class FilterEachStage extends EachStage 037 { 038 private Filter filter; 039 040 public FilterEachStage( FlowProcess flowProcess, Each each ) 041 { 042 super( flowProcess, each ); 043 } 044 045 @Override 046 protected Fields getIncomingPassThroughFields() 047 { 048 return incomingScopes.get( 0 ).getIncomingFunctionPassThroughFields(); 049 } 050 051 @Override 052 protected Fields getIncomingArgumentsFields() 053 { 054 return incomingScopes.get( 0 ).getIncomingFunctionArgumentFields(); 055 } 056 057 @Override 058 public void initialize() 059 { 060 super.initialize(); 061 062 filter = each.getFilter(); 063 } 064 065 @Override 066 public void receive( Duct previous, int ordinal, TupleEntry incomingEntry ) 067 { 068 argumentsEntry.setTuple( argumentsBuilder.makeResult( incomingEntry.getTuple(), null ) ); 069 070 try 071 { 072 if( filter.isRemove( flowProcess, operationCall ) ) 073 return; 074 075 next.receive( this, 0, incomingEntry ); 076 } 077 catch( CascadingException exception ) 078 { 079 handleException( exception, argumentsEntry ); 080 } 081 catch( Throwable throwable ) 082 { 083 handleException( new OperatorException( each, "operator Each failed executing operation", throwable ), argumentsEntry ); 084 } 085 } 086 }