    001/*
    002 * Copyright (c) 2007-2016 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
    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  }