    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;
    022
    023    import 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     */
    029    public 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      }