001/* 002 * Copyright (c) 2016-2017 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; 023 024import java.io.IOException; 025 026/** 027 * Class FlowSkipIfSinkNotStale is a {@link cascading.flow.FlowSkipStrategy} implementation that returns 028 * {@code true} if the Flow sink exists and is not stale in relation to the Flow sources. 029 * <p> 030 * This is the default Cascading strategy. 031 * 032 * @see cascading.flow.FlowSkipIfSinkExists 033 */ 034public class FlowSkipIfSinkNotStale implements FlowSkipStrategy 035 { 036 public boolean skipFlow( Flow flow ) throws IOException 037 { 038 long sinkModified = flow.getSinkModified(); 039 040 return sinkModified > 0 && !flow.areSourcesNewer( sinkModified ); 041 } 042 }