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.flow.stream; 022 023 /** 024 * 025 */ 026 public abstract class Gate<Incoming, Outgoing> extends Duct<Incoming, Outgoing> 027 { 028 protected Duct[] allPrevious; 029 030 public Gate() 031 { 032 } 033 034 @Override 035 public void bind( StreamGraph streamGraph ) 036 { 037 super.bind( streamGraph ); // sets next 038 039 allPrevious = getAllPreviousFor( streamGraph ); 040 } 041 042 /** 043 * the actual previous in this context, not necessarily the declared previous 044 * 045 * @param streamGraph of type StreamGraph 046 * @return of type Duct[] 047 */ 048 protected Duct[] getAllPreviousFor( StreamGraph streamGraph ) 049 { 050 return streamGraph.findAllPreviousFor( this ); 051 } 052 }