    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.hadoop.planner.rule.expressiongraph;
    022
    023import cascading.flow.FlowElement;
    024import cascading.flow.planner.PlannerContext;
    025import cascading.flow.planner.graph.ElementGraph;
    026import cascading.flow.planner.iso.expression.ElementCapture;
    027import cascading.flow.planner.iso.expression.ExpressionGraph;
    028import cascading.flow.planner.iso.expression.FlowElementExpression;
    029import cascading.flow.planner.iso.expression.TypeExpression;
    030import cascading.flow.planner.iso.finder.SearchOrder;
    031import cascading.pipe.HashJoin;
    032import cascading.pipe.Splice;
    033
    034import static cascading.flow.planner.iso.expression.AndElementExpression.and;
    035import static cascading.flow.planner.iso.expression.NotElementExpression.not;
    036
    037/**
    038 *
    039 */
    040public class MalformedJoinExpressionGraph extends ExpressionGraph
    041  {
    042  public MalformedJoinExpressionGraph()
    043    {
    044    super(
    045      SearchOrder.ReverseDepth,
    046      and( ElementCapture.Primary,
    047        new FlowElementExpression( HashJoin.class )
    048        {
    049        @Override
    050        public boolean applies( PlannerContext plannerContext, ElementGraph elementGraph, FlowElement flowElement )
    051          {
    052          return super.applies( plannerContext, elementGraph, flowElement ) && !( (Splice) flowElement ).isSelfJoin();
    053          }
    054        },
    055        not( new FlowElementExpression( HashJoin.class, TypeExpression.Topo.SpliceOnly ) )
    056      )
    057    );
    058    }
    059  }