001/* 002 * Copyright (c) 2007-2017 Xplenty, 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 021package cascading.flow; 022 023import java.io.IOException; 024 025/** 026 * Class FlowSkipIfSinkExists is a {@link cascading.flow.FlowSkipStrategy} implementation that returns 027 * {@code true} if the Flow sink exists, regardless if it is stale or not. 028 */ 029public class FlowSkipIfSinkExists implements FlowSkipStrategy 030 { 031 public boolean skipFlow( Flow flow ) throws IOException 032 { 033 // if tap is in replace mode, will be treated as not existing 034 long sinkModified = flow.getSinkModified(); 035 036 if( sinkModified <= 0 ) // do not skip, sinks don't exist 037 return false; 038 039 return true; 040 } 041 }